REHAU: BUiLDiNG THE FUTURE · REHAU: BUiLDiNG THE FUTURE ENERGY-EFFiCiENT RENOVATiON USiNG ... for...
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www.rehau.at Construction Automotive Industry REHAU: BUILDING THE FUTURE ENERGY-EFFICIENT RENOVATION USING REHAU’S SOUTH-EASTERN EUROPE HEAD OFFICE AS AN EXAMPLE
Transcript of REHAU: BUiLDiNG THE FUTURE · REHAU: BUiLDiNG THE FUTURE ENERGY-EFFiCiENT RENOVATiON USiNG ... for...
www.rehau.at ConstructionAutomotive
Industry
REHAU: BUiLDiNG THE FUTUREENERGY-EFFiCiENT RENOVATiON USiNG REHAU’S SOUTH-EASTERN EUROPE HEAD OFFiCE AS AN EXAMPLE
2
ENERGY-EFFiCiENTCONSTRUCTiON, RENOVATiON
One of our core issues is that of energy efficiency in connection with renewable energy. Existing buildings in particular have some of the greatest potential when it comes to the energy revolution. This will only happen if energy systems are renovated and built accordingly in a forward-looking way in future.
Energy-efficient renovation provides greater independence, sustainably reduces operating costs, and contributes both to a lasting increase in the property‘s value and to increased productivity.
In this regard, REHAU‘s systems are making sustainable contributions to advance these topics. Globally, there is no provider who can offer the required solutions to this extent and in this combination from a single source. In this regard, we see ourselves as partners with our customers and interested parties and, with our services, provide much more than just our products.
Dipl.-Kfm. (Business graduate)
Jörg Neukirchner
Deputy CEO and Director of the Strategic
Business Division Construction of the
REHAU Group
ENERGY-EFFiCiENTCONSTRUCTiON, RENOVATiON
The energy required for heating and cooling is provided by a system com-prised of two heat pumps and 14 geo- thermal probes each at a depth of 100 meters. A third heat pump caters for the tap water purification and assists ventilation.
4
ENERGY SYSTEM RENOVATiON AT THE HiGHEST LEVEL
The site in Guntramsdorf near Vienna, location of REHAU‘s South-Eastern Europe Head Office, of the Construction Sales Division - Austria and the International Academy was renovated in just ten months in years 2010/2011. A building with role model character was erected here according to low-energy housing standards. During reconstruction, the entire REHAU range of innovative polymer solutions was used with an economic and ecological future in mind, while calling on its many decades of experience in the construction area.
The project will be monitored over the long-term in collaboration with the renowned Technical University - Braunschweig (Germany). Alongside a detailed analysis of the energy and water consumption, the type and setup of the building envelope, the heating, ventilation and usage of the respective rooms in particular are put under scrutiny.
Before
5
After
The new thermal insulation composite system (20 cm) helps to significantly reduce energy losses here. The old windows were replaced by 58 GENEO windows with a U-value of approx. 0.86 W/m²K.
6
Mag. Rafael Daum
CEO of the REHAU Region:
South-Eastern Europe
REHAU HEAD OFFiCESOUTH-EASTERN EUROPE
Here, we have developed a showcase project for customers and employees which demonstrates exactly what REHAU can do through smart building renovation. But it also shows the cost savings that can be achieved in the long-term thanks to the use of energy-efficient systems and renewable energy.
Thanks to the energy-relevant renovation of the exterior envelope, the installation of new windows of passive house standard, the switchover from gas to renewable energy resources as well as a superior fully-automated building control system, the annual heating and cooling requirements can be verifiably reduced by up to two-thirds.
7
The new South-Eastern Europe Head Office is both a meeting place and a communica-tions hub for customers, partners, employees, and friends of the company.
8
iNTERNATiONAL SHOWCASE PROJECT
Outdoors: Insulation/Thermal Composite System (20 cm) Outside shading
1 58 windows with heat-protected glazing made of GENEO profiles *)2 1 GENEO lift-slide door (Uw value 0.74) 3 Manifold chamber and outdoor facility heating4 District heating supply INSULPEX 5 Local heating supply RAUVITHERM6 150 m² RELAZZO decking system
Indoors:7 200 m² acoustically insulating tambour doors RAUVOLET acoustic-line *) 8 Surface materials RAUVISIO *)9 Edgeband solutions RAUKANTEX designo *)
Building Services:10 14 geothermal probes (100 m each) RAUGEO 11 2 reversible brine/water heat pumps (2 x 17 kW) for heating and cooling11 1 brine/water heat pump (37 kW) for tap water provision and ventilation support12 1,500 m² subsurface heating/cooling *) 13 1 anti-microbial ground-air heat exchanger (5,500 m³/h) AWADUKT Thermo 14 RAUTITAN domestic installation system *) 15 1,250 m² acoustic chilled ceiling 8/18R *)
CO2-guided ventilation control 16 Technical showroom17 Central building control system with energy monitoring
*) installed on all floors of the building
A Pepsin Building - Management
- Business Division - Construction: Window and
Curtain Walling Technology, Building Services, and
Civil Engineering & Infrastructure
- Human Resources
- Communications and Public Relations
- IT/IS
B Alloxan Building - Construction Sales Division - Austria
- Industry Business Divisions:
- Furniture and Industrial Solutions
- RAUMEDIC
- Lounge
- Kitchen
C International ACADEMY - Purchasing and Logistics
- Presentation room
- Building Services - Showroom and Lab
- Window training workshop
- Bistro
D Energy Park
E Beach Volleyball Court
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1
2
3
4
5
6
7
89
10
11
12
13
14
14
15
16
17
16
A
B
C
D
E
10
A NEW AND UNiQUE CONCEPT
- Very high energy/heat loss due to inadequate insulation and old windows - Very high energy consumption in particular for cooling due to mobile air-conditioning devices - Room conditions at the limit or outside the comfortable range - No individual controlling option on the different floors
- Room temperatures practically uncontrollable and thus often too high or too low - CO2 concentration inside certain rooms sometimes at critical levels - Lacking social rooms and communication areas for employees
- Minimized energy loss thanks to optimum insulation using thermal composite system to passive house standard - Much reduced energy consumption - Pleasantly stable temperature during hot spells - “Natural” cooling (without heat pump) to a large degree - Noticeably improved acoustic surroundings thanks to acoustic chilled ceiling and sound-absorbing tambour door solutions
- Separate control over the individual floors and rooms - CO2-guided ventilation control for fresh air supply as needed - Livable comfort - Staff and customer congregation areas - (kitchen, lounge and communication island) - Hobby areas like beach volleyball court, terrace and open-air grounds
Situation in the building before…
… and after renovation
11
iNCREASiNG VALUE - SAViNG COSTS
Key factors in comparison: The building before ... ... and after renovation
Annual heating energy requirements 151,659 kWh/a 36,016 kWh/a
Annual cooling energy requirements - - - 14,173 kWh/a
Gross surface area 1,736 m² 1,866 m²
Conditioned gross volume 6, 258 m³ 6,249 m³
Specific heating requirements 61 kWh/m²a 27 kWh/m²a
Heating load 95 KW 25 KW
Specific heating load 63 W/m² 16,6 W/m²
Cooling load - - - 36 KW
Specific cooling load - - - 25 W/m²
The renovation of the REHAU site saw a building being erected that can supply itself with renewable energy and thus is the perfect symbiosis of energy efficiency, innovation, design and functionality, focused on the individual needs of the people working therein.
Just one year after renovation, not only was there outstanding potential for savings, but there was also a significant increase in employee well-being.
12
Subsurface heating/cooling across 1,500 m² caters for comfortable temperature control.
13
Energy production
Energy distribution
Heat pumps Geothermal probes Ground-air heat exchanger Central ventilation system
Subsurface heating Acoustic chilled ceiling
BUiLDiNG SERViCES CONCEPTREHAU Guntramsdorf location redesign
Feed temperature - Heating +32 °C Feed temperature - Cooling +17 °C
Building envelope
InsulationWindow
Building heating load 17 W/m² Building heating load 27 W/m²
14
SCiENTiFiC ACCOMPANiMENT
Together with TU Braunschweig (Germany), a highly complex long-term monitoring model was developed. This should demonstrate in particular how much energy can be saved by using renewable resources from the ground and the air and how efficient the interplay of all the components is - from the energy source all the way to the implementation of issues like comfort. In Technical Building Services (TBS), only that which can be measured can be controlled and optimized, which is also the core philosophy behind energy monitoring. What‘s important, right at the start when conceptualizing the TBS, is to determine the relevant data for operations evaluation in order to be able to subsequently optimize accordingly.
Choosing from over 1,500 measurement points in and around the building, TU Braunschweig selected 500 for energy monito-ring and evaluation. Here, heat quantity, electricity, water and operating hours counters as well as temperature/CO2/humidity sensors are used.
Another aim of the Head Office SE energy monitoring was to make the building services not just visible, but traceable in a comprehensible way using real measured values. This included finding out how renovation affected the energy consumption and the subsequent cost-effectiveness. The evaluations are supple-mented with regular surveys of the employees which let conclusions be drawn as to their level of comfort.
www.rehau.at/headofficeSE
The energy monitoring data can be accessed
worldwide via the Internet.
Building managers are being confronted again and again with increasing energy prices and accruing CO2 emissions, which means that interest in reducing energy consumption is growing continually. As such, evaluating the corresponding consumption data as an instrument of the Technical Building Services is of increasing importance both financially and in terms of cost-effectiveness. Derived measures may not be at the expense of heating comfort.
15
Thanks to the clear visualization of the building control system with all subsys-tems, their components and the consump-tion values, it is possible to estimate and evaluate the current situation in the building at a glance.
16
PRiMARY ENERGY SAViNGS
Dipl.-Ing. Klaus Paul Koch
Technical Director of subsurface heating/
cooling systems REHAU Group
It was possible to save 64 % of consumption costs by the renovation. That corresponds to 330,576 kWh/a final energy savings or 138 tons CO2 savings per year.
14 hectares of reforested wood would be required to neutralize this quantity of CO2 and thereby
reduce the greenhouse effect.
Here, we have created a sustainable building with outstanding thermal comfort and an incredibly low concentration of CO2 in the room air. As such, we were able to reduce our annual consumption costs by 64 %. Our employees have provided excellent feedback, referring for the most part to much higher levels of well-being, which, in turn, results in a visible increase in productivity.
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90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
ELECTRiCiTY USAGE REDUCED CONSiDERABLY
Electricity consumption 2012
18
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
After renovation, fossil fuels were no longer used at all. Previously, a gas boiler was used for heating. Today, reversible brine-water heat pumps and close-to-surface geothermal heating, among other things, have replaced this boiler.
Gas price for commercial buildings:
approx. 7 cent/kWh,
Electricity price for commercial buildings:
approx. 14 cent/kWh
Net building area: 1,552 m²
64 % LESS CONSUMPTiON COSTS
It was possible to reduce energy consumption costs by 64 %, which means annual savings of €27,600 for 2012.In the second year of operations, even higher savings are expected as the system will already be broken in. Energy monitoring also made possible the further optimization of the interoperation among the individual components.
Consumption-based costs / Energy consumption
19
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
COOLiNG OPERATiON ALMOST ENTiRELY WiTHOUT HEAT PUMP
In 2012, approx. 83,000 kWh of thermal energy was used for heating and 53,000 kWh for cooling. When cooling, free cooling was used for the most part. Here, the cooling medium is fed through the heat exchanger and the reservoir to the acoustic chilled ceilings. Energy is only necessary to power the pumps and control technology. In June, the seasonal performance indicator of the free cooling averaged at 13 and at peak times it was as high as 55. The heat pumps here do very little cooling work and only need to be activated for peak loads. During this, they usually run
alone and virtually never in parallel. The values of the heat pumps average out at 5 and are thus above the best practice specification of approx. 4.2. When heating, approx. 51 % of the overall energy is provided by two heat pumps. The third provides support with the operation of the ventilation unit and heating of drinking water. Another large proportion of the cooling work is carried out by the ventilation. In Summer, the ground-air heat exchanger (GAHE) cools down the outer air considerably; often temperature changes of 10 K and peak values of up to 16 K can be recorded.
Generators in comparison - Useful energy when heating/cooling Jan 1, 2012 - Jan 1, 2013
Key: GAHE: Ground-air heat exchanger
HP: Heat pump
CM: Cooling machine
20
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
In the year 2012, approx. 25,200 kWh of thermal energy was transferred for heating the outside air and 31,800 kWh of thermal energy for pre-chilling the outside air using the ground-air heat exchanger. This means it was possible to heat or cool the air at peak times by up to 16 Kelvin. It is clear that by using ground-air heat exchangers all year around, it will be possible to make significant energy savings. During periods of heat, preheating in the frost-free area is achieved all year around. During the cooling period, pre-cooling is done partially to such an extent that dehumidification happens
in places. This means that the air-conditioning system, unlike a system without a ground-air heat exchanger, must be used for dehumidification particularly because one part of the cooling process has already been executed by the ground-air heat exchanger. While the heat recovery device in systems without ground-air heat exchangers is used before the cooling unit for pre-cooling in Summer, the device can be used with a system with ground-air heat exchangers for reheating purposes, which is necessary in Summer due to dehumidification.
SiGNiFiCANT ENERGY SAViNGS
In the year 2012, approx. 25,200 kWh of thermal
energy was transferred for heating the outside air
and 31,800 kWh of thermal energy for pre-chilling
the outside air using the ground-air heat exchanger.
This means it was possible to heat or cool the air at
peak times by up to 16 Kelvin.
Ground-air heat exchanger before entering the buildingEnergy transfer - Heating/Cooling 2012
21
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
Geothermal probe field 1 bears the greatest loads both when heating and cooling. The differences to the other two geothermal probe fields, however, are comparably minor. As such, they differ from each other by just approx. 23 % in the two load cases. This is also the way to determine that heating is dominant over cooling over the course of the year. The dominance, however, is not very large as the geothermal probe temperature of the individual fields has not shown any significant changes on closer inspection.
The minimum brine temperature in the geothermal probe fields was previously 1 °C, which makes it clear that to date, unlike the design, which was executed at -3 °C, much less heating and cooling load was needed. The maximum fluid temperature was 19 °C, which is why it was possible to operate the system in passive cooling mode for the most part.
LOW COOLiNG AND HEATiNG LOAD
Geothermal probe fields 2012 [kWh]
22
SUSTAiNABLY ECONOMiCAL
Dipl.-Ing. Jörg Eberhardt
Director of Building Services Business Unit
REHAU Region: South-Eastern Europe
Annual building costs *)
8 % Financing
8 % Building operation
1 % Energy
83 % Staff
*) Source: Fraunhofer Institute
A full amortization approach opens up new horizons. When we speak of office investment, we can‘t forget what we are actually talking about: the people in the building and their performance and costs. Cautious targets of a one to five percent increase in efficiency open up new perspectives by providing a comfortable and intelligent working environment where these people can experience well-being and feel appreciated: a highly efficient investment, which, at first glance, may seem a luxury.
23
An important contributor to comfort in the workplace is good room acoustics. In the South-Eastern Europe Head Office, a series of innovative products like acoustic chilled ceilings and sound-absorbing tambour doors are contributing to its improvement.
24
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
Heating comfort before ...
The graphics show both the room temperatures as well as the relative humidity of the pilot rooms in the building. Before renovation, more than 50 % of measured values were counted as being above the comfort limit; approx. 1/3 of the values were critically uncomfortable (> 26 °C) and somewhat too humid (> 63 %) and thus perceived as unpleasant.
Measurement period:
Monday - Friday, 8:00 am to 6:00 pm
Usage time: 1,400 [1/4 h] h
Requirements in acc. with DIN EN ISO 7730:
- Category B
- Room temperatures 23 - 26 °C
- Relative humidity 30 - 70 %
GREATLY iMPROVED ROOM CLiMATE
25
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
After the renovation, a significant improvement in the room ambience can be detected: hardly any exceeded values could be determined. The reasons for this are the regulated subsurface heating and cooling and the ventilation system with which it is coordinated. This way it was possible to achieve a pleasant, constant room temperature close to nominal values during both the heating and cooling periods.
As such, it was possible to significantly increase the comfort levels in the building during the course of renova-tions. The average CO2 concentration level, much like the acoustics, were considerably improved. According to studies, temperatures between 23 °C and 26 °C and, for example, blue light, increase creativity.
Measurement period:
Monday - Friday, 8:00 am to 6:00 pm
Usage time: 1,400 [1/4 h] h
Requirements in acc. with DIN EN ISO 7730:
- Category B
- Room temperatures 23 - 26 °C
- Relative humidity 30 - 70 %
OPTiMUM TEMPERATURES iNCREASE CREATiViTY
… and after the renovation
26
TOTAL SAViNGS iN FiRST YEAR: €27,600
As part of the renovation works and energy monitoring, the interplay among the individual components was optimized and coordinated with each other as needed. In addition, it was possible to increase the comfort in the building much like it was possible to considerably improve the average CO2 concentration levels and the acoustics. It has been proven that buildings optimized in terms of energy, heating and user-friendliness increase both motivation and productivity among those people who work in them.
The added investment to that effect in renovations carried out at the Guntramsdorf site over “normal” renovations was €250,000 due to the inclusion of reversible heat pumps, close-to-surface geothermal heating, a ground-air heat exchanger and acoustic chilled ceilings.
Total operational savings for 2012 amounted to €27,600 which can be improved on even more so over the coming years by optimizing the system.
8 years
6 years
3 years
The following amortization periods are based on the differences in C and D (see diagram on right):
Annual energy savings
of €30,000 taken into account
Annual energy price increase
of 10 % taken into account
Additional €45,000 effectiveness increase
(1 % estimation of wage costs with
full building occupancy)
27
AMORTiZATiON APPROACHES
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
kWh thermal
300
250
200
150
100
50
0
kWh/m²NGFa
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0
Mio €
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C]
16 18 20 22 24 26 28 30 32
100
80
60
40
20
0
Relative humidity [%]
Room temperature [°C] 16 18 20 22 24 26 28 30 32
20,000
18,000
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
0
Energy consumption [kW/h]
January February March April May June July August September October November December
Energy consumption [kW]
100
90
80
70
60
50
40
30
20
10
0
Heat pump 1
Heat pump 2 + 3
Total RTL
Cooling machine 1+2
Total lighting
Total pumps
Total devices
E�ective building power - Monthly average
E�ective building power - Monthly max.
E�ective building power - Monthly min.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
Savings [kW/h]
January February March April May June July August September October November December
Heating Cooling
4,000
3,000
2,000
1,000
0
-1,000
-2,000
-3,000
Extraction work [kW/h]
January February March April May June July August September October November December
Probe field 1
Probe field 2
Probe field 3
Cool
ing
Heat
ing
10,873
41,930
29,743
19,701
20,910
7,380
Heating Cooling
GAHE incl. Bypass heating: 13 %
HP 2 + 3 heating: 51 %
HP 1: 36 %
GAHE incl. bypassCooling: 37 %
Free Cooling/ Geothermal heating: 39 %
HP 2 + 3 cooling: 14 %
18,686 €
before renovation after renovation
Measurement data before renovation Measured value recording Jan 1, 2012 - Jan 1, 2013
172
111
283
70
CurrentGas
15,210 €
24,118 €
3,38
2,69
2,332,10
comfortable
Recommended range very pleasant
uncomfortably humid
uncomfortably dry
Ground floor 051st floor 08 2nd floor 102nd floor 14
comfortable
uncomfortably humid
uncomfortably dry
Ground floor 061st floor 06 2nd floor 06 2nd floor 09
-27,594 €
CM 1 + 2: 10 %5,000
Recommended range very pleasant
87%
act
ive
heat
ing
13%
pas
sive
hea
ting
76%
pa
ssiv
e co
olin
g24
%
activ
e co
olin
g
Amortization approaches
The diagram shows various investment sums as a
basis for a cost-effectiveness approach to building
services. The figures are based on solid data from
the site renovation at Guntramsdorf. Stimulus
packages claimed were not taken into account here.
ACost of renovation including
surroundings not including the two additional buildings (three in total) at
the site
BCosts reduced to the renovated
building without interior fitting and outdoor facilities
Cas B) under normal conditions*
Das C) but with usual building
services, that is, without acoustic chilled ceiling, without ground-air
heat exchanger
If the energy costs of the Guntramsdorf site are taken as an example, then the added investment in the energy-relevant renovation pays for itself after eight years; and if an annual increase in energy prices of 10 % is assumed, it will pay for itself after just six years. Nevertheless, these approaches fall short. This is because neither the human factor nor their performance are taken into account. After all, personnel costs make up 80 %.
In light of this, energy costs seem altogether insignificant. Starting from here makes sense as even minimum changes to motivation, concentration, employee turnover, sick days, simplification of the recruiting processes with modern workplaces, etc. can have astounding effects. And this can be proven scientifically. High-value investments pay off after surprisingly little time, in this case, after three years.
From all these components, an ROI of between 3 and 8 years results.
* that is, without additional scientific functions with reduced monitoring needs, without demonstrable character, without changing the punctuated facade, while taking discovered findings into account (for example, only two or three heat pumps are deemed necessary)
28
RENOVATiON OF ENERGY SYSTEM PAYS OFF!
The conservative approach when it comes to erecting utility buildings is to construct at the most favorable price possible. It is often forgotten to relate the expenditure to useful life. However, if you plan ahead in this regard, money can actually be “made” with an office building in the long-term, or in other words, you can save more than just the normal costs.
In any case, the value of the property is not simply maintained, it has been proven to increase in the long-term.
Each building is a complex organism inside which different elements and cycles flow together. Only when all components gear into each other seamlessly does the potential of renovation become clear.
29
InsulationThe building envelope and the windows shape its character in a very profound way - optically, functionally, and energetically. This is because both are decisive factors when it comes to reducing energy losses to a minimum. The window and curtain walling profiles of REHAU provide not only brand quality, but also the individual solution to all require-ments. This way, for example, the unique GENEO profile system reduces the energy loss through the windows by up to 76 % while maintaining optimum comfort levels. The range on offer is versatile: from systems for windows, curtain walling, lift-slide and front doors to conservatories and decking systems, all the way to roller and louver shutters as well as interior window boards.
Building servicesWith REHAU systems for heating and cooling, the energy exchange is done over a large area and primarily through radiation. This brings about an optimum room climate. What‘s more, subsurface heating/cooling systems compared to classic solutions make possible low supply temperatures when heating and high supply temperatures when cooling.
In combination with the heat pumps and the use of renewable energy from solar and geothermal solutions, REHAU offers a sensible and convenient overall concept when it comes to energy provision
REHAU SOLUTiONS iN DETAiL
30
Water managementFor a number of years now, REHAU has been focusing on solutions for a sustainable water management approach which secures this vital resource for future generations. Simultaneously the company helps to adhere to the increasingly strict environ-mental specifications in a future-proof way while avoiding taxes.
The systems cover the entire water cycle from the drinking water supply to storm water management, all the way to waste water disposal and purification. High-performance polymer materials guarantee leak-tightness and offer long-term security.
REHAU‘s domestic installation systems guarantee hygienically clean drinking water. Its premium waste pipes make possible noise-insulated waste water drainage.
REHAU SOLUTiONS iN DETAiL
31
Indoor solutions The average person spends between 70,000 and 80,000 hours at their workplace - well-being and a good atmosphere are pre-requisites for high performance and motivation. Open, modern room designs also require new acoustic approaches in order to create space for both communication and concentration.
Developed and patented by REHAU, a tambour door system in combination with the acoustic chilled ceiling noticeably reduce noise levels in the room.
The surfaces range - for the kitchen, lounge, and washrooms - combines functionality with design.
Creative flair was provided by the edgeband range of REHAU, which is as versatile as ever when it comes to touch, feel and function.
Outdoor solutions Decking can be designed individually thanks to the REHAU WPCThe ecological material RAU-WOOD, a mixture of natural woods and polymers developed specifically for this in Austria, impresses not just with its sophisticated optics, durability and ease-of-maintenance, but also with its modern design and wonderfully natural feel.
REHAU has been distinguished by the Austrian Ministry of Life and by the State of Lower Austria for
its dedication to operational environmental protection and energy efficiency at its offices.
Further information can be found at
www.rehau.at/headofficeSECompany information:
REHAU Gesellschaft m.b.H Industriestrasse 17
A-2353 Guntramsdorf Austria
Tel: (+43) 2236 24684-0 [email protected]
www.rehau.at
As the premium brand for polymer-based solutions, REHAU is an international market leader in the Construction, Automotive and Industry areas. With its power to innovate, its industry-wide setup and the efficient synergy which results from this, the modern and professionally operated family-run company is unique to the polymer industry.
Among its core skills are material and system development as well as surface technology. Here, with over 15,000 employees at over 170 locations around the world, REHAU takes up its position as a driver of innovation.
REHAU has had offices in Austria since 1956. For almost 15 years now, the South-Eastern Europe region, with its now 1900 employees across 24 locations in 19 countries, has been set up and managed from here.
© REHAU DIM00085 EN 09.2013
