Case Studies examples

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Green dots = New case studies (Annex 62)
Blue dots = Previously existing case studies (Annex 50)

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Austria

AT001 – Innsbruck – Vögelebichl multi-family houses
The buildings are the first in the world responding to highest efficiency standards. Furthermore, the buildings were designed to achieve the annual net-zero energy balance thanks to on-site renewable energy generation. (more)
View Annex 49’s in-depth case study: click here

AT002 – Innsbruck – Fennerstrasse Project
In Summer of 2022, in 48 apartments, a switch was made from individual boilers to a heat pump-boiler
combination for hot water and heating as part of the thermal refurbishment. (more)

AT003 – Vienna – D12
The residential building D12 is a block of 7 buildings with 4-6 storeys each, commercial use on the ground-floor (GF) with 8 shops on 900 m2 and 213 flats on the upper levels. Seven heat pumps have been installed to cover the buildings energy supply in combination with PV, solar thermal and solar hybrid modules. (more)
View Annex 49’s in-depth case study: click here

AT004 – Weiz – Hot Ice Weiz
Hot Ice Weiz is focused on the use of latent heat with two ice storages and two heat pumps in combination with unglazed solar collectors and a PV system. It is designed as a pilot project for local heat supply. (more)

Belgium

BE001 – Oostende – Room with a view
In the centre of Ostend, on Belgium’s coast, a new building project is being completed. The Waves complex will be made up of four buildings, ‘Sea’, ‘Salt’, ‘Sand’ and ‘Sky’. In a special room on top of ‘Sea’, there is a hybrid air-gas heat source, which will provide heating and sanitary hot water for the 118 flats and commercial spaces below. (more)

BE002 – Bornem – Barl’lo: heat pumps in harmony with nature
The project demonstrates how heat pumps can be used for both heating and cooling in buildings that
are (almost) energy neutral. (more)

Finland

FI003 – Kemi – Former Finnish Defence Building
In Kemi, Finland, an old apartment building built by the Finnish Defence Forces required
extensive renovation. Instead of by oil, the building would now be heated by ground
source heating. (more)

France

FR001 – La Ciotat – Solar heated senior living
Opened in mid 2018, a senior-living building in La Ciotat is another good example for heat pumps in civilian residential buildings. A 60m² solar panel is providing energy for the two heat pumps. (more)

FR002 – Sartrouville – A specialised system with hidden heat pumps
“This pilot project became a textbook solution which has been replicated with regard to French
Building Codes RE2020 and RE2025″ – M. Cilleros (Groupe intuis) (more)

FR003 – Nice – Eco-district
The district heating system, specific to this Eco-district in Roquebrune Cap Martin, Nice is quite innovative. It is based on the treated water rejected by water treatment plant located 500m far from the ecodistrict. This water is used as the cold source of 8 heat pumps for DHW production and 5 heat pumps for heating and cooling. (more)

FR004 – Marseille – Newly built
A newly built private house is located in Marseille, in the South-East of France. The hot water production is arranged by a solar heat pump. For this installation, climate and sunshine are very favorable. Thus, solar panels are installed on the building roof. (more)

FR005 – Soisson – Social Housing renovated
In Soissons, heating is supplied by a renovated district heating grid connected to a wood-fired heating plant. The DHW production was ensured by individual electric water heaters until now. The replacement of these by a collective heat pump induces a 50% reduction on the electric bill due to DHW production. (more)

Germany

DE001 – Bruchköbel – Heated floors and fresh water
Not infrequently, new buildings attach great importance to efficient insulation and environmentally friendly energy production. In Bruchköbel, the builder himself, with the help of his own construction company, has set himself the task of equipping his new building with advanced energy systems. (more)

DE002 – Düsseldorf – Quartis Les Halles
If former industrial and commercial areas are overbuilt, entire districts are often created in a very short time with a distinctive atmosphere and modern flair. This is also the case in the Düsseldorf district of Derendorf, where the discarded freight yard makes way for the Neues Düsseldorfer Stadtquartier, which heavily relies on heat pumps. (more)

DE003 – Petershagen – Energy Island
Seven new buildings were built in Petershagen in eastern Germany near Berlin, each with a heat pump and photovoltaic systems on the roofs. Six of them contain apartments that are specially adapted to the needs of older people and the seventh is a community building. (more)

DE004 – Potsdam – Boarding House
Over a net floor area of 3248 square meters a heat pump cascade system provides warm water, pleasant room temperatures and enough energy for the catering business on the ground floor of the new holiday home Boarding House Potsdam. (more)

DE005 – Frankfurt (Main) – nZEB multi-family houses
In August of 2015 the five-storey multi-family residential building (17 apartments) was commissioned. The all electric building is equipped with a 50 kWth electric brine-water heat pump that uses a total of 85 m2 of solar absorber in addition to an ice storage as heat source. The nZEB multi-family houses are located in the quarter of Riedberg in Frankfurt. (more)

DE006 – Ennepetal – Green buildings – geothermal
In Ennepetal, North Rhine-Westphalia in western Germany, a private investor is building three apartment buildings of which one is being used as a reference project for achieving energy efficiency in the most economical way. (more)

DE007; DE008 – Karlsruhe – Smart District Durlach
These two buildings form part of a cluster of five large renovated multi-family buildings from the 1960s within the Karlsruhe district Durlach, where an integrated energy system is demonstrated within the research project “Smart district Durlach”, Ersinger Street 2 and Ersinger Street 4.

DE009 – Kempen – Old School Building
Between 1881 and 1966 children were taught inside this old school building in Kempen, which is now listed. In the meantime, the building served as a church, community administration and youth hostel. In 2008, the house was finally rebuilt by its new owner into a multi-family house with five residential units. After the existing building had been heated over the years with an oil heating and district heating, the decision was made to use a heat pump as an environmentally friendly solution. (more)

DE010 – Hemer – Full renovation and new, clean heating
The aim of this project was to protect the climate, increase security of supply and strengthen regional value creation at the same time. (more)

Ireland (Republic of)

IE001 – Dublin – Hot water heat pump in an intelligent system
When so much can be done via a phone app, why not apartment services too? This was a developer’s
thinking when planning a 382 apartment complex in Dublin. (more)

Italy

IT001 – Turin – Hybrid with Solar
Three apartments building in Turin. The project is focused on a hybrid design between solar thermal collectors, heat pump and a gas boiler. It is a renovation operation which successfully combine existing solar system with an in-series combination of gas boiler and air source heat pump.

IT002 – Turin – Hybrid with Gas boiler
Sixty apartments not retrofitted building in Turin. The project is focused on a hybrid design between an air source heat pump and two gas boilers. It is a renovation operation which successfully combine a gas boiler and air source heat pump in parallel in order to minimize the energy consumption especially during mid-season.

IT003 – Milan – CaseVerdeNoce
The intention expressed by the builder was to build an environmentally sustainable building, which would use eco-sustainable and easily recyclable materials, positioning it at the first levels of the energy classification of the Lombardy Region and guaranteeing high living comfort. (more)

IT004 – Savona – A sea-centered project
The space, known as the Complesso della Torre, was to include a 19 storey apartment block, a courtyard and a commercial space with a hotel, 31 shop units and 20 office units. The sea’s presence in the new complex would be more than simply symbolic. It would also have a crucial technical role: providing the energy for the air conditioning and domestic hot water of the entire project via a heat pump system. (more)

IT005 – Milan – Building with centralized plant turned hybrid
The upgrade from Energy Performance Certificate C to a level A wade made possible by equipping the building with thermal insulation and replacing the existing heating systems with a complete Clivet system based on multi-purpose heat pumps, high temperature water-water heat pumps, boilers and the Intelliplant comfort and energy management system. (more)

IT006 – Concorezzo – Centralized Hybrid System
New Class A construction in climate zone E* with heating, air conditioning and a hot water system. (more)

*2102 to 2999 heating degree days (HDD)

IT007 – Milan – Building with Centralized Hybrid System
Refurbishment in climate zone E* with heating, air conditioning and hot water system. (more)

*2102 to 2999 heating degree days (HDD)

Netherlands

NL001 – Hendrik Ido Ambacht – Sophia Staete
Sophia Staete is a new residential care building delivered in 2013 of approx. 13,000 m2. Two central HPs deliver 35 °C supply for space heating and source energy for 74 separate DHW-booster-HPs in each apartment. The central HPs use ATES as source system, which is regenerated by low temperature thermal solar collectors (Energyroof)

NL002 – Leiden- Jacques Urlus Plantsoen
In this project two MFBs of 200 apartments each and an elderly care centre (all non-renovated buildings) in 2018 were equipped with a high temperature HP of 1500 kWth to replace the existing CHP gas engine and gas boilers. The HP can deliver 85 °C peak supply during wintertime for space heating based on an ATES system. In autumn and spring outside air is used as HP source. DHW is also provided by the HP on a temperature of 65 °C.

NL003 – Tilburg – Leyhoeve
The Leyhoeve complex was delivered in 2016 and consists of 285 care apartments. The apartments are spread over six floors and have a total gross floor area of 39,650 m². 3 variable speed piston HPs of 200 kWth each with BTES as source system produce heating and cooling. DHW of 72 °C is delivered by 3 high temperature HPs of 100 kW each (also variable speed piston types) which use condenser heat of the BTES HPs as source.

NL004 – Vlaardingen – Second Skin
In 2017, 12 portico houses have been renovated according to the 2ndSKIN concept into “Zero Energy”-houses. The portico houses originally date from 1952 and have been thoroughly renovated including three-layer insulating glass. The new façade has an extra shaft for the two central heat pumps (each one separate for 6 apartments) and associated pipework. The source for each heat pump is a vertical GSHX (BTES) of 175 m deep.

NL005 – Den Haag – Hoog Lindoduin
The deep renovation of this 14-story building with 182 apartments was finalised in 2021, almost 60 years after its original construction. In the renovated building each apartment has its own HP which delivers space heating and DHW. The source is a collective BTES system consisting of 60 GSHXs of 250 m each providing free cooling during summertime.

NL006 – Breda – Sculptures
The Sculptures complex was delivered in 2012 and consists of a total of 283 apartments, including 245 regular apartments and 35 care apartments. There is also 3,500 m2 of common care, including 4 psycho-geriatric departments. The base load of space heating is delivered by a water-to-water HP of 300 kWth with ATES as source. DHW is produced by 200 m2 of thermal solar collectors and HE gas boilers. These gas boilers also deliver the peak load for space heating. Free cooling during summertime is delivered by the ATES system. The houses and the care departments have underfloor heating.

Spain

ES001 – Madrid – Energy efficiency and maximum comfort
When the 89 apartment project in the Spanish capital got the green light, the starting point was the need for a highly energy-efficient air conditioning system that would provide maximum comfort. (more)

ES002 – Madrid – Three Heat Pumps are enough to claim the BREEAM Certificate, Spain
In San Sebastian de los Reyes in the heart of Spain, a building with 56 homes is heated and cooled by just three heat pumps. (more)

Switzerland

CH001 – Bern – Solar renovation
Three connected buildings from 1963 were renovated in 2013. The workers improved the insulation, canged the windows and added two heat pumps. The solar panels on the roof are able to provide 148% of the required energy for the 18 households.

CH002 – Uster – First MINERGIE-A®-building with office use
The first MINERGIE-A® building with office use has been monitored for two years from May 2014 – April 2016. The all-electric building is equipped with a 33.1 kW ground-source heat pump (B0/W35) a 24 kWp solar PV-system and a 7.1 m2 PV/T-collector for domestic hot water (DHW) preheating. Moreover, a mechanical ventilation sys¬tem with 80% heat recovery is installed. The ground-source is used for free-cooling in summer operation.

CH003 – Zurich – Concrete building revamp
In Zurich, three heat pumps were built on top of an living unit from 1982 in 2016. The whole construction was also completely revamped by adding new floors, windows, insulation, solar panels and air conditioning. (more)

CH004 – Horgen – Allmendholz
The multi-family house has four apartments and is equipped with a geothermal heat pump with two bore- holes of 225 m each for space heating and DHW production.

CH005 – Geneva – St. Julien
The project in St. Julien, Geneva concerns the replacement of an existing oil heating system by a HP only solution in a multifamily building. With the goal of having the total heat production from HP origin, two air/water heat pumps were implemented on the rooftop. One of the previous fuel oil boilers was kept for back up. (more)

CH006 – Geneva – Daru
The project in Daru, Geneva concerns the replacement of an existing gas heating system by a hybrid heat pump & gas solution in an existing multifamily building. With the goal of having the maximum annual heat production from HP origin, six air/water heat pumps were implemented on the rooftop. (more)

CH007 – Zurich – Bivalent Heat Pumps
Another older example from Zurich is a multi-family housing scheme, which was built in 1928 and modernized in 2001. The new heat pump is able to provide all required hot water at least in the summer months. (more)

CH008 – Bern – Remote heat pump
In Bern, an old oil heater was replaced by a new heat pump. Although the heat pump is not directly located at the building, it is still possible to transport the heat into the apartments by a pipe system.

CH009 – Geneva – La Cigale
A solar assisted Heat Pump with ice storage ensuring 92% of the heat production for a 19.000m² extensively retrofitted multifamily building complex, in combination with back-up gas boiler. (more)

CH010 – Geneva – La Fontenette
A centralized wastewater Heat Pump with a complementary gas boiler, for a high performance multifamily buildings complex, with heat distribution via a dedicated district heating system. (more)

CH011 – Geneva – Laurana
Renovation of a District Heating heat production plant combining gas boilers with a Heat Pump for flue gas heat recovery and geothermal heat production via a borehole field. (more)

CH012 – Geneva – Les Vergers
An eco-district including 33 high performance buildings heated by a 5 MWth HP on shallow groundwater. (more)

CH013 – Geneva – SolarCity
Solar assisted HP in combination with unglazed solar collectors for a new multifamily building complex in Geneva, Switzerland. (more)

CH014 – Geneva – Soubeyran
Heat Pumps on exhaust air for Space Heating and Domestic Hot Water in a very high performance multifamily building. (more)

CH015 – Geneva – Versoix-Centre
A four-pipe District Heating and Cooling network with a 400kWth Heat Pump on lake water, for a mixed-use building complex. (more)

United Kingdom

GB001 – Poole A pre-wired solution for safe and speedy heating
A former restaurant and bar were to be demolished in Poole, on the UK’s south coast. Their replacement? A nine apartment development that would bring a modern urban feel to the town’s quayside. (more)

GB002 – Blackburn – Kensa & Together Housing Daisyfield
The Daisyfield Towers were heated by old and obsolete gas boilers, which Together Housing was keen to decommission and replace with efficient and environmentally friendly Kensa heat pumps. The aim was to maintain the residents’ comfort and safety, save money on heating bills, and move away from fossil fuel reliance. (more)

GB003 – Chadwell St Mary – Kensa & Thurrock Council
In a ground-breaking project with Thurrock Council, three high-rise tower blocks will get their storage heaters replaced with Kensa ground source heat pumps that are three times more energy-efficient and set to reduce fuel bills by over 50% for some Thurrock residents. (more)

more coming soon…