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SLOVENSKI STANDARD
SIST CWA 17941:2022
01-december-2022
Smernice za celostni pristop k projektom prenove stavb na podlagi izboljšanih
plitvih geotermalnih tehnologij
Guidelines for an integrated approach of building retrofitting projects based on enhanced
shallow geothermal technologies
Planungs- und Installationsrichtlinien für ein Gebäudesanierungskonzept auf Basis von
EGS (Enhanced Geothermal Systems)
Ta slovenski standard je istoveten z: CWA 17941:2022
ICS:
27.190 Biološki viri in drugi Biological sources and
alternativni viri energije alternative sources of energy
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST CWA 17941:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST CWA 17941:2022
SIST CWA 17941:2022
CEN
CWA 17941
WORKSHOP
October 2022
AGREEMENT
ICS 27.190; 91.140.10
English version
Guidelines for an integrated approach of building
retrofitting projects based on enhanced shallow
geothermal technologies
This CEN Workshop Agreement has been drafted and approved by a Workshop of representatives of interested parties, the
constitution of which is indicated in the foreword of this Workshop Agreement.
The formal process followed by the Workshop in the development of this Workshop Agreement has been endorsed by the
National Members of CEN but neither the National Members of CEN nor the CEN-CENELEC Management Centre can be held
accountable for the technical content of this CEN Workshop Agreement or possible conflicts with standards or legislation.
This CEN Workshop Agreement can in no way be held as being an official standard developed by CEN and its Members.
This CEN Workshop Agreement is publicly available as a reference document from the CEN Members National Standard Bodies.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
Ref. No.:CWA 17941:2022 E
SIST CWA 17941:2022
Contents Page
Foreword . 3
Introduction . 4
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, and abbreviations . 7
4 Steps for an integrated approach . 8
4.1 Building the integrated project design team . 8
4.1.1 Clients . 9
4.1.2 Designers . 10
4.1.3 Contractors . 11
4.1.4 Managers . 11
4.2 Defining main phases and identifying primary roles in the SGE building retrofitting
project . 12
4.2.1 Project life-cycle phases . 12
4.2.2 Primary roles of actors . 13
4.3 Developing a collaborative workflow schedule . 23
SIST CWA 17941:2022
Foreword
This CEN Workshop Agreement (CWA 17941:2022) has been developed in accordance with the CEN-
CENELEC Guide 29 “CEN/CENELEC Workshop Agreements – A rapid way to standardization” and with
the relevant provisions of CEN/CENELEC Internal Regulations - Part 2. It was approved by a Workshop
of representatives of interested parties on 2022-09-30, the constitution of which was supported by CEN
following the public call for participation made on 2022-02-25. However, this CEN Workshop Agreement
does not necessarily include all relevant stakeholders.
The final text of this CEN Workshop Agreement was provided to CEN for publication on 2022-10-04.
Results incorporated in this CWA received funding from the European Union’s Horizon 2020 research
and innovation programme under grant agreement No 792210.
The following organizations and individuals developed and approved this CEN Workshop Agreement:
• COMSA INSTALACIONES Y SISTEMAS INDUSTRIALES SA (Antonio Galindo Fernandez)
• FAHRENHEIT GMBH (Ursula Wittstadt)
• i.LECO NV (Adriaan Brebels)
• IDP INGENIERIA Y ARQUITECTURA IBERIA SLU (Mikel Borràs / Eduard Loscos)
• IDS GEORADAR SRL (Guido Manacorda)
• NATIONAL UNIVERSITY OF IRELAND GALWAY (Marcus M. Keane / Luis M. Blanes)
• NOBATEK INEF 4 (Romain Lhomer)
• R2M SOLUTION SRL (Marco Calderoni)
• SINDEQ BORRTEKNIK AB (Lasse Aman)
Attention is drawn to the possibility that some elements of this document may be subject to patent rights.
CEN-CENELEC policy on patent rights is described in CEN-CENELEC Guide 8 “Guidelines for
Implementation of the Common IPR Policy on Patent”. CEN shall not be held responsible for identifying
any or all such patent rights.
Although the Workshop parties have made every effort to ensure the reliability and accuracy of technical
and nontechnical descriptions, the Workshop is not able to guarantee, explicitly or implicitly, the
correctness of this document. Anyone who applies this CEN Workshop Agreement shall be aware that
neither the Workshop, nor CEN, can be held liable for damages or losses of any kind whatsoever. The use
of this CEN Workshop Agreement does not relieve users of their responsibility for their own actions, and
they apply this document at their own risk. The CEN Workshop Agreement should not be construed as
legal advice authoritatively endorsed by CEN/CENELEC.
SIST CWA 17941:2022
Introduction
In Europe, the building sector is responsible for 40% of the total energy consumption and represents
about a third of Europe’s CO emissions. Heating and cooling accounts for 50% of annual energy
consumption in EU, making it the biggest energy end-use sector ahead of both transport and electricity ).
This is a huge socioeconomic and environmental problem, considering that roughly 75% of EU buildings
2)
are not energy efficient , and that approximately 75% of heating and cooling is still generated from fossil
3)
fuels . On this basis, buildings represent a large energy-savings potential, once renovated and upgraded,
if the heating and cooling sector sharply reduces its energy consumption and cuts its use of fossil fuels to
fulfil the EU’s climate and energy goals. However, today the annual renovation rate of the building stock
varies from just 0.4 to 1.2% in the Member States. According to the European Green Deal, this rate will
need to at least double to reach the EU’s energy efficiency and climate objectives.
Given the labour-intensive nature of the construction sector, which is largely dominated by local
businesses, building renovation plays a crucial role in European economic recovery especially following
the COVID-19 pandemic. To kick-start the recovery, the Commission has launched several initiatives to
2)
further support the renovation of EU buildings .
To pursue this dual ambition of energy savings and economic growth, in 2020 the Commission published
a new strategy to boost energy-efficient building retrofitting called "A Renovation Wave for Europe –
Greening our buildings, creating jobs, improving lives". Also, the EU has established a legislative
framework (which includes the Energy Performance of Buildings Directive 2010/31/EU (EPBD) and the
Energy Efficiency Directive 2012/27/EU), providing direction to the future sustainable built
environment by supporting low carbon energy usage in buildings.
In this context, shallow geothermal energy (SGE) is a renewable energy source (RES) with large potential
to facilitate energy savings and GHG emissions reduction in the building sector and therefore help to
achieve all major objectives of the EU’s energy policy. Moreover, the main reference organisations - such
4) 5)
as ECTP and RHC-ETIP - have promoted and roadmapped the cost-effective integration of RES into
building technical systems. The development of effective and affordable enhanced geothermal systems
(EGSs) is crucial to exploit the EU geothermal potential as a major source of energy supply for heating
and cooling purposes, by targeting bottlenecks that hinder the full deployment of geothermal systems as
one of the key concepts in energy efficient building retrofitting.
This CWA is motivated by the main goals of the EU Horizon 2020 GEOFIT innovation project
(funded under grant agreement number 792210). It is meant to provide general management
guidelines for stakeholders involved in a building retrofit project based on SGE technologies.
The type of SGE building retrofit project which is addressed in this CWA focuses on the
technologies described below. However, it is necessary to consider that SGE building retrofitting
does not explicitly require the use of all these specific technologies.
) https://ec.europa.eu/energy/topics/energy-efficiency/heating-and-cooling
) https://ec.europa.eu/energy/topics/energy-efficiency/energy-efficient-buildings
) Eurostat 2019
) ECTP European Construction, built environment and energy efficient building Technology Platform
) RHC-ETIP European Technology and Innovation Platform on Renewable Heating and Cooling
SIST CWA 17941:2022
• Information and communication technologies (ICT) tools for ground research and worksite
monitoring: non-invasive and integrated techniques for ground research, worksite and building
monitoring.
The following innovative technologies can be considered:
— Monitoring tools capable of assessing the stability of buildings involved in retrofitting
operations, for example Ground Based Interferometric Synthetic Aperture Radar (GBInSAR).
— Radar interferometry enabling 3-D spatial measurements.
— Ground Penetrating Radar (GPR), with automatic detection process.
— Interface between the GPR and Web Map Services (WMS) to download/upload the underground
asset maps before/after the survey.
— Building information modeling (BIM) integration of structural building monitoring tools during
drilling works.
— Drone monitoring.
• Drilling technologies: adapted to the context of SGE building retrofitting:
— Vertical drilling.
— Trenchless - horizontal directional drilling (HDD) techniques that enable the deployment of
horizontal loops like geothermal heat exchangers in this context.
• Geothermal/ground source heat exchangers (GHEX): with corresponding suitable configurations
for SGE building retrofitting and effective installation.
— Vertical borehole type heat exchangers.
— Earth basket and helical type heat exchangers.
— Shallow horizontal or slinky type heat exchangers.
• Ground Source Heat Pumps (GSHPs): optimized for the use of geothermal heat and building
retrofit applications. As existing buildings are less flexible compared to new buildings, this issue must
be addressed explicitly.
— Hybrid (thermally and electrically driven) heat pump (HP) system for high temperature lifts
which integrates better with a smaller GHEX compared to conventional systems.
— Electrically driven HP system for high temperature lifts which integrates better with a normal
sized GHEX.
— Integration of other RES (e.g., photovoltaic and solar thermal) to increase the total RES share.
• Heating and cooling solutions for energy-efficient building retrofitting.
— Easy-to-install and efficient heating solutions, for example low-temperature heating (LTH)
technology suitable for GSHPs.
SIST CWA 17941:2022
— Easy-to-install and efficient cooling solutions, for example high-temperature cooling (HTC)
technology enables a high coefficient of performance (COP) of GSHPs used in building
retrofitting. The possibility to get cooling with direct use of the cold water in the bedrock can be
also considered, as a very energy efficient method where the only energy required is that
required to pump the liquid around.
• ICT based control systems and building energy management systems (BEMS) that enables the
full utilization of the EGS in retrofitted buildings by unlocking energy flexibility services using
demand side response techniques.
• BIM enabled tools for management of SGE building retrofitting.
Considering the interoperability of the aforementioned technologies, this document provides a
general methodological management framework using an Integrated Design and Delivery
Solutions (IDDS) approach
...