REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

New cooperation

between REHVA and

Member Associations

Anita Derjanecz, REHVA Managing Director

OE HVAC Seminar, Lisbon, 20.10. 2016

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Strategy of the new

REHVA President and Board

• More interaction with Member Associations

• Engaging young professionals –members of our MAs - in

REHVA, increased participation (EU level events,

REHVA committees, networking, social media)

• Focus on EU policies (EPB standards, and EPBD

review) and activities

• NEW: REHVA institutional supporter

• Create and represent a strong European voice of the

sector in the EU and globally – evidence based mandate

from MAs and supporters.

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Actions on EPBD review :

• Participating in stakeholder and

expert groups - ie. JRC report

"Healthy and Energy-Efficient

Buildings in EU“

• Position papers

• Meetings with DG ENER

• Event in the European

Parliament during the 1st

reading phase

EU public affairs, advocacy

REHVA policy paper

on EPBD review

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

• Promoting the national level application of

EPBD and the related standards

• Information services (Newsletter,

Supporters Bulletin, online services –

policy tracking)

• Transnational knowledge transfer and

capacity development: REHVA

guidebooks, REHVA Journal, EU projects

• REHVA technical seminars and

conferences

EU policy implementation

– intelligence and knowledge sharing

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

• Development of EU level harmonized

schemes, knowledge sharing platforms

and practical tools for professionals

– PROF/TRAC Training and qualification

platform on nZEB

– European Voluntary Certification scheme for

non-residential buildings

– On-line HVAC dictionary with 12000+ terms in

15 languages

EU policy implementation

– intelligence and knowledge sharing

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

REHVA in EU projects

Nearly Zero

Energy Hotels –

promoting energy

refurbishment of

hotels

PROF/TRAC –

European Training

an Qualification

Platform on nZEB

skills

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

REHVA in EU projects

QUANTUM – Life

cycle quality

management tools for

building performance

MPC-: GT –

Development of

hybrid GEOTABS

systems with model

predictive control,

design guidelines

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

SERVICES TO REHVA MEMBERS

• Regular information on EU directives, regulations and

standards

• Participation in REHVA committees and Task Forces

• Active participation in REHVA General Assembly.

Invitation to the REHVA Annual Conference

• Invitation to REHVA Seminars and events in Brussels.

• reHVAClub events – joint event to bridge HVAC

designers and manufacturers

• Participation in EU projects

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

REHVA services for members

Publications & online media

• REHVA Journal printed end online

• REHVA Guidebooks and Reports

• E-Newsletter

• REHVA Energy Group on LinkedIn

• REHVA dictionary

• REHVA Website Restricted Area

10 e-Guidebooks– GB#1 - DISPLACEMENT VENTILATION IN NON-INDUSTRIAL PREMISES

– GB#4 - VENTILATION AND SMOKING - Reducing the exposure to ETS in buildings

– GB#5 - CHILLED BEAM APPLICATION GUIDEBOOK

– GB#6 - INDOOR CLIMATE AND PRODUCTIVITY IN OFFICES

– GB#7 - LOW TEMPERATURE HEATING AND HIGH TEMPERATURE COOLING

– GB#8 - CLEANLINESS OF VENTILATION SYSTEM

– GB#9 - HYGIENE REQUIREMENT FOR VENTILATION AND AIR CONDITIONING

– GB#10 - COMPUTATIONAL FLUID DYNAMICS IN VENTILATION DESIGN

– GB#19 - Mixing Ventilation - Guidebook on mixing air distribution design

– GB#21 - Active and Passive Beam Application Design Guide

– REPORT 6 - REHVA Workshops at CLIMA 2016 - Building and HVAC system performance in practice

REHVA Workshops and Course Videos

EU policy information

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

A SHORT SURVEY

• Do you follow REHVA activities?

• Are you using REHVA services?

• Are you interested in joining REHVA

activities, projects and international

networking?

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Cooperation

opportunity

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

• European Training Platform and Qualification scheme on nZEB skills for

professionals in the building sector

• Targeting engineers, architects and managers involved in nZEB design and

construction

• Integration into national training schemes CPD and up-skilling of

professionals.

PROF/TRAC

European Training and Qualification

Platform on nZEB skills

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

• 5 TtT sessions for ACE & REHVA member associations, and

training providers joining PROF/TRAC

• The ‘trained trainers’ are ambassadors of the PORF/TRAc

scheme ensuring that the materials are adapted in their

national training portfolio and courses will be organised

• 9 REHVA MAs joined PROF/TRAC and attended the TtT

courses co-financed by REHVA

• 3rd round TtT - Vanlecia, Spain, March 2017 – call open!

European “Train the Trainers” programme

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Support to REHVA MAs

Training material database

PROF/TRAC APP

Educational guide national courses

Trainers platform

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Advanced system

design and operation

of GEOTABSREHVA Guidebook nº 20

Franziska Bockelmann

Stefan Plesser

Hanna Soldaty

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

REHVA Task force

Franziska Bockelmann,

Stefan Plesser, Hanna

Soldaty - IGS-TUB,

Arno Dentel, Adrian

Görtgens, Germany

Wim Boydens, Lieve

Helsen, UGHENT

Jan Hoogmartens, Wout

Parys, Maarten Sourbron,

Clara Verhelst, Jan

Verheyen, KU Leuven

Daniel Cóstola, TU/e

Belgium

Bjarne Olesen,

DTU

Denmark

Lukas Ferkel

CVUT

Czech Republic

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Why this Topic ?

• We spend most of our life indoors, the quality of the built

environment plays a vital role for humans’ wellbeing and

ability to work.

• EU energy objectives (nZEB goals) are a challenge for

architects and engineers: to design functional and healthy

environment and at the same time become more energy

efficient.

• To achieve this goal we need to apply the best available

practices and technologies for buildings.

• GEOTABS is one of the most interesting technical

solutions for energy efficient and healthy buildings.

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Aim of the Guidebook

• To provide comprehensive information on GEOTABS

systems.

• Support building owners, architects and engineers in

an early design stage showing how GEOTABS can be

integrated into their building concepts.

• Give helpful advices from experienced engineers that

have designed, built and run GEOTABS systems.

• It is a useful guide through early designs, building

simulation, mechanical engineering, commissioning

and operation towards energy efficient, comfortable

and healthy buildings.

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Guidebook Contents

1. TERMINOLOGY, SYMBOLS, UNITS

2. INTRODUCTION

3. WHAT IS GEOTABS?

4. POSSIBILITIES AND LIMITATIONS OF GEOTABS

5. GEOTABS: DESIGNING THE GROUND SYSTEM

6. GEOTABS: DESIGNING THE BUILDING

7. GEOTABS: SYSTEM INTEGRATION

8. GEOTABS: COMMISSIONING, OPERATION & MAINTENANCE

9. OUTLOOK

10. GEOTABS BUILDINGS – DIVERSITY OF SOLUTIONS

11. REFERENCES

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

What is a GEOTABS• GEOTABS: a combination of a GEOthermal heat pump and a

Thermally Activated Building System.

• TABS is a water based radiant (more than 50% of heat transfer

by radiation) heating and cooling system using low water

temperature heating and high water temperatures cooling in

buildings.

• The energy heat supply and removal is realized through a

geothermal system using a heat pump. This changing double

function uses the ground as heat sink and heat source.

• To assure the required thermal comfort additional

supplementary or back–up systems are combined to support

the GEOTABS when required

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Advantage of GEOTABS TABS are one of the most comfortable ways to condition indoor spaces,

especially multi-storey offices.

Their ability to heat and cool with medium, close to room temperature

makes them the perfect match for ground heat exchangers. Heat

pumps work best with these low temperature differences between

source and sink.

This concept is further strengthened through the use of electricity as

only source of energy either from the grid or produced on-site by

photovoltaic system.

As a result no carbon based process is needed in the building, which

reduces emissions in cities and saves cost for supply infrastructure and

space for chimneys.

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Possibilities and limitations of

the system

• The optimal combination of the TABS and geothermal

heat pump requires careful incorporation in overall

building design, adaptation in the building´s operation

and integration with other systems.

• Specific boundaries to reach thermal comfort in the

building at reduced energy use.

• Building owners and customers must be informed about

the limitations and boundaries – i.e. limited room level

control.

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Possibilities and limitations of the system

Strengths

1. Water supply temperatures:

• <30°C for heating

• >15°C for cooling

Exploiting environmental energy:

(ground coupled) heat pumps,

passive cooling and night cooling.

2. Large thermal capacity (time

constants of 10-15h) to shift TABS

operation to time periods when heat

and cold production is most energy

(or cost) efficient.

3. Increased thermal comfort by

radiation heat exchange.

4. Reduced building height compared to

buildings with full AC.

Weakness

1. Limited average thermal power

output of 40 to 50 W/m². Allow

temperature drifts within the

specified comfort range or provide

an additional, fast reacting

system.

2. Limited individual room control.

3. Not useful to change set-point

during a day.

4. Acoustic control – limited

suspended ceiling.

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Integral design process

All performance aspects

have to be addressed for

overall building

performance:

• low-energy features

• constraints posed by

national legislation

• owner / project

developer expectations

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Designing the ground system

• Adaptation to geological constraints on-site,

hydrogeological aspects

• Special attention should be paid to simulation

programs and standards – compliance with strict legal

requirements, energy piles)

• Overview of system types and components (open loop

systems, closed systems, borehole heat exchanger,

• Design strategies and boundaries to be considered for

the different systems components and types with

practical check-lists based on practitioners experience

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Designing the building

Properties recommended for the GEOTABS building

Main restrictions:

• Transmission

• External gains and losses, in

particular solar gains in

summer – to be addressed

by shading + high performing

envelope

• Internal gains: internal heat

loads from the appliances

have to be reduced to a

minimum

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

System integration• GEOTABS is an advanced and optimized

concept for sustainable buildings, requires a

high level of understanding and careful design,

construction and operation.

• To exploit its full potential and avoid

malfunctioning the integration of building

services into the global system and a

comprehensive understanding of control

strategies are very important.

• Overview of design and integration of the

different building services and of control

strategies.

Typical hydraulic scheme with TABS,

ground coupled heat pump and passive

cooling.

Hydraulic schema GEOTABS: cooling tower.

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Commissioning and maintenance

Boundaries for GEOTABS key performance indicators

Commissioning is an essential requirement for

GEOTABS systems in commercial buildings to ensure

that the system operates in the intended way.

The GB provides guidelines and tips for all necessary

steps:

• Step 1: Definition of objectives

• Step 2: Definition of measurement an verification

(M&V) concept

• Step 3: Initial Commissioning

• Step 4: On-going Commissioning

Example of a carpet plot: annual electrical load of building presented (source:

www.synavision.de).

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

GEOTABS buildings - case studies

• 5 case studies as examples of realized concepts

• Demonstrating wide spectrum of design, operation and applied control strategies

• General conclusion: particular emphasis on dynamic simulations for optimal

design, control strategies, and monitoring and commissioning to avoid

malfunctions

Case study 1: ARCADIS, Hasselt, BE

• GEOTABS with ground coupled heat pump

using a borefield of 24 borehole heat

exchangers with a depth of 75 m

• Passive cooling, mechanical ventilation with

night cooling

• Control strategy to switch between services

Heating and cooling curve for TABS and mechanical ventilation

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

GEOTABS buildings - case studies

Case study 2: Hollandsh Huys, Hasselt, BE

• Major heating and cooling is covered by the ground

coupled heat pump with its passive cooling unit

• TABS has a double water piping circuit that can be

controlled separately

• AHU uses a small gas boiler as back up to cover small

heat peaks in the mid-seasons

• External slat shading device, angle adjusted

automatically

Summer (left) and winter (right) energy concept

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

GEOTABS buildings - case studies

Case study 3: VGH headquarter, Lüneburg, DE

• energy concept: optimized ventilation, the daylight use, active

solar shading and activation of foundation piles for heating and

cooling (100 piles, 17 to 22 meters).

• Base load covered by geothermal HP, additional heat

requirement covered by district heating.

• The reversible heat pump can be used for cooling purposes in

summer, TABS provide direct cooling using the ground

temperature as long as it’s possible.

• Ground coupled heat pump supplies the TABS in the offices

and training rooms during the night in winter.

Heating and cooling curve for TABS and mechanical ventilation

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

GEOTABS buildings - case studies

Case study 4: INFRAX West. Antwerp, BE

• Energy concept: activation of TABS for heating and cooling.

Additional floor convectors allow individual control of

heating in winter. TABS, floor heating and preheated air

handling units are supplied by two heat pumps coupled with

borehole heat exchangers.

• Additional hot water from a gas boiler for convectors and

radiators, can be added to the low temperature heating

system.

• Mechanical ventilation with heat recover in summer and

winter. In mid-season the building is naturally ventilated

through the manually opening of windows. Reversible heat

pump is activated if higher cooling need in the summer.

Summer (left) and winter (right) energy concept

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Outlook: new EU project

MPC-;GT

• REHVA started a new EU project, follow-up of GEOTABS

• Title: Model Predictive Control and Innovative System Integration of GEOTABS in

hybrid Low Grade Thermal Energy Systems

• Aims for higher system efficiencies and higher

implementation numbers

• Lowering investment and engineering costs via

optimized sizing, adaptive control, MPC.

• NEW REHVA Guidebook based on the outcomes

REHVA

Federation of European Heating, Ventilation and Air-conditioning Associations

Contact:

Anita Derjanecz

Managing Director

ad@rehva.eu

Thank you for your Attention!