COSTIC - Programme SOLHEATCOOL PROGRAMME SOLHEATCOOL STUDY AND DEVELOPMENT OF HEATING / COOLING...

COSTIC - Programme SOLHEATCOOL

PROGRAMME SOLHEATCOOL

STUDY AND DEVELOPMENT OF HEATING / COOLING SYSTEMS USING RENEWABLE ENERGY

COSTIC - Comité Scientifique et Technique des Industries Climatiques - Eric MICHEL

Enerbuild Participant number : 37

COSTICCOMITE SCIENTIFIQUE ET TECHNIQUED ES IND USTR IES C LIM A TIQU ES


PROJECT PARTNERS

COSTICResearch centre - Technical co-ordinator

JACQUES GIORDANO INDUSTRIES - FranceManufacturer of solar collectors

VELTA - GermanyManufacturer of heating / cooling floors

ZAE BAYERN - GermanyManufacturer of absorption heat pump

IMPAE / NOA - GreeceModelling of the system


RESEARCH TOPIC

TO DEVELOP A SOLAR HEATING / COOLING SYSTEM COMPOSED OF :

• Absorption heat pump

• Solar thermal collectors

• Heating / cooling floor


RESEARCH TOPIC

Floor coolingsystem

A H P

10kW10.5kW15kW17.7kW

44kW

-15% 0.7 -5%

0.4

Solarcollectors

WaterTank

Cooling tower700 W/m²

AuxiliaryHeating


BACKGROUND

Existing reversible systems :

• Conventional heat pump• Gas absorption heat pump using LiBr / water with power over 100 kW

Aim of the programme :

To design a HCFC free heating cooling systems using renewable energies for small or medium buildings

Type of buildings :

• Surface : about 300 m²• Tertiary sector - little collective housing


PROJECT OBJECTIVES

• To study the application of a floor system for cooling

• To study high performance solar thermal collectors

• To study a Lithium bromide / Water absorption heat pump

• To study the complete heating / cooling system


STUDY OF THE HEATING / COOLING FLOOR SYSTEM

• Tests achieved in climatic cell

• Study of the influence of parameters on the heat exchange coefficient : Objective was to obtain heat exchange coefficient around 7 W/m².K

• Testing of a system : inertia - reaction of the control



MEASURE OF THE HEAT EXCHANGE COEFFICIENT

8,2

7,7

6,5

7,9

6,6

7,8 8

7,17,5

6,66 6,3

6,7 6,3

0

1

2

3

4

5

6

7

8

9E

xch

ang

e co

effi

cien

t [W

/m².

K]

13°C

17°C

21°C

26°C

33°C

40°C

90l/h

140l

/h

250l

/h

Tile

s

Lino

Car

pet

0,5

Vol

/h

1 V

ol/h

Watertemperature

Outsidetemperature

Water flowAir renewal

Average value : 7,1 W/m².K

Covering


Convective heat

exchange26%

Radiant heat exchange

74%


HEAT EXCHANGE REPARTITION

1,9 W / m² K

5,5 W / m² K


STUDY OF CONTROL

Measurement of the response to a pseudo step of supply water temperature

Measurement of the response of a floor system to several scenarios

• Slow and mean increase of the external dew point• Fast increase of the external dew point• Fast increase of the load• Cycle with internal inputs and solar load simulation

Results• Control must insure a fast reaction of water temperature to

variation of the dew point in order to limit risks of condensation on the floor


STUDY OF THE SOLAR COLLECTORS

C8 prototypes

CORTEC prototype

Improvements brought to the collectors

• New selective coating to improve the efficiency

• New welding process : laser welding to allow an on line production



C8/8S with laserwelding and parallelcirculation

C8/8S

Objective= 0,75 - 4,5 T/H

C8

Efficiency = 0,84 - 4,38 T/H

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0,00 0,01 0,02 0,03 0,04 0,05 0,06 0,07 0,08 0,09 0,10

Eff

icie

ncy

C8 COLLECTORS



CORTEC

50%

60%

70%

80%

90%

100%

0,00 0,01 0,02 0,03 0,04 0,05 0,06 0,07 0,08 0,09 0,10

Eff

icie

ncy

Efficiency = 0,96 - 3,08 T/H

CORTEC with laserwelding

CORTEC

Objective= 0,89 - 2,5 T/H


Description of the tests (1)

• Measurement of the efficiency of the heat pump according to several parameters:

– Temperature of the water from the collectors;

– Temperature of the water from the cooling floor;

– Temperature of the water from the cooling tower.

• Testing of the prototype in real conditions coupled with cooling floor and solar collectors.

STUDY OF THE ABSORPTION HEAT PUMP


Description of the tests (2)

Return from cooling tower temperature

Ret

urn

from

sol

ar c

olle

ctor

ste

mpe

ratu

re

Chilled water temperature



T

T

generator

evaporator

Condenser/absorberA

bsor

ptio

n he

at p

ump

To solar collectors To cooling floor Floor simulator12 kW

Collectors simulator24 kW

Cooling Tower

TMake-up

Test facilities (1)



Test facilities (2)




Tboiler inlet = 94,4 °CTboiler outlet = 87,3 °C

Cooling floor

Absorptionheat

pump10,1 kW 7,1 kW

17,9kW

Cooling tower

Tevaporator inlet = 20,7 °CTevaporator outlet = 17 °C

Tcondenser inlet = 29,3 °CTcondenser outlet = 35,4 °C

COP = 0,7

T = 7,1 K

T = 6,1 K

T = 3,7 K

First results of tests in laboratory

Boiler


CONCLUSION (1)

Study of the heating / cooling floor system• Measurement of the heat exchange coefficient • Sizing of the whole system• Study of the working of the control• Objectives reached

Study of the solar collectors• Measurement of the performances of some prototypes • Objectives reached

Study of the AHP (on going)• Measurement of the performance according to several

parameters (boiler temperature, evaporator temperature, cooling tower temperature) : first results showed a good working of the AHP. The COP reaches 0.7.


CONCLUSION (2)

Study of the whole system• Connection of the different part of the system and

measurement of the performances

Modelling• Modelling of the working and preparation of a handbook and

a data basis of the results of the modelling

End of the programme : September 2001

COSTIC - Programme SOLHEATCOOL PROGRAMME SOLHEATCOOL STUDY AND DEVELOPMENT OF HEATING / COOLING...

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Transcript of COSTIC - Programme SOLHEATCOOL PROGRAMME SOLHEATCOOL STUDY AND DEVELOPMENT OF HEATING / COOLING...