CASES
The best way to understand our solutions is through real-world examples
Haderslev District Heating Utility
- Denmark’s largest CO₂ air-source heat pump to date
The Case
In 2024, Haderslev district heating in Denmark expanded its facilities with a new energy plant, which includes Denmark’s and probably the world’s largest CO₂ air-source heat pump to date. The machine room is inside a 2,000 m2 new building and holds five CO₂ heat pumps, a chiller (with heat recovery) and two defrost units. In connection with the new building, an electric boiler (15 MW) and a 5,000 m³ accumulation tank have also been installed. Finally, a new transmission line has been established from the energy plant to the local consumers in Haderslev.
The expansion was driven by an expected increase in heat demand, as many residents have transitioned away from natural gas. With the new energy mix, the Haderslev plant increases the share of green heat in the network, improves both flexibility and supply security – and not least, reduces heating costs for consumers.
For Fenagy, this project represents our largest commissioned heat pump installation to date.
The heat pumps
The installation consists of five H-2600 air-source CO₂ heat pumps, with a total heating capacity of 12 MW. While wood chips will remain the primary heat source, the heat pumps are expected to meet the entire heat demand during summer periods.
40 evaporators - energy collectors – are installed outside the machine room to draw heat from the ambient air. Down the middle is a covered walkway with integrated electrical panels to ensure safe and easy access for service and maintenance of the evaporators.
In addition to the heat pumps, Fenagy has supplied a C-300 chiller (with heat recovery), also using CO₂ as refrigerant, delivering 140 kW of cooling to the machine room and transformer room. The excess heat from this process is recovered and fed directly into the district heating network.
The accumulation tank on site is 5,000 m³ and can store up to 300 MWh of heat. With this storage, the heating plant can produce extra heat when electricity prices are low, store it in the accu-tank and supply it to the district heating network when prices are high. This setup increases operational flexibility and reduces the overall energy costs.
In total, the heat pumps can supply enough heat for more than 2,000 households.
Year: 2024
Heat pumps: 5 x H-2600 AW
Application: Air-to-water heat pumps
Heat capacity: 12 MW (34°C/76°C return and flow (4°C/85% ambient conditions)
Chiller (with heat recovery): C-300 15°C/7°C cold side, 34°C/76°C warm side
Cooling capacity: 140 kW
Accumulation tank: 5000 m3
VELUX LKR Innovation House
- flexible heating and cooling integrated in one energy system
Project: VELUX LKR Innovation House · Photo: Adam Mørk
The Case
In Østbirk, Denmark, VELUX is transforming a former warehouse into a state-of-the-art facility, which will be the company’s central hub for research and development: the VELUX LKR Innovation House.
Fenagy has delivered a highly flexible energy system for the renovated building –a system designed to meet the heating and cooling comfort requirements year-round.
The energy system supplies both heating and cooling, either independently or simultaneously. This customised system combines air-to-water and water-to-water heat pump operation while also meeting the building’s cooling demand.
In winter, the system delivers heat; in summer, it provides cooling. During spring and autumn, it runs in combined mode –enabling energy to be recovered and redistributed internally. For example, surplus heat from sun-exposed south-facing rooms can be used to warm cooler, north-facing areas.
Project: VELUX LKR Innovation House · Photo: Adam Mørk
Project: VELUX LKR Innovation House · Photo: Adam Mørk
The energy system
The installation features a CHC-1200 air-to-water and water-to-water system that uses CO₂ as a refrigerant and integrates both heat pump and chiller functionalities. The setup includes specially developed air heat exchangers, which function as both energy collectors and heat rejectors. In summer, they operate in gas cooler/chiller mode to expel heat to the surrounding air. In spring and autumn, depending on whether cooling or heating demands the most energy, the air heat exchangers function as gas coolers or evaporators to boost and/or balance the system. In winter,
they collect ambient energy to enable full air-to-water heat pump operation.
At the core of the solution is Fenagy’s PLC system, which intelligently controls the operating modes in real time based on demand. This ensures smooth seasonal transitions and efficient internal energy balancing.
With this integrated solution, VELUX will be fully selfsufficient in heating and cooling - independent of external energy sources. The compact design requires minimal machine room space while delivering optimal energy performance and consistent indoor comfort in the entire building.
The energy solution supports the holistic renovation vision of the VELUX LKR Innovation House, uniting sustainable building design with year-round comfort and energy efficiency.
Year: 2024
Energy system: CHC-1200 AW + WW
Application: Combined heating and cooling (CHC)
Heating capacity: 1.3 MW, 35 °C/55 °C hot water
(5 °C/85 % humidity)
Cooling capacity: 500 kW, 10 °C/4 °C cold water
Heat source: Air + excess heat
Project partners: Praksis Architects · Søren Jensen Engineers · KG Hansen · DETBLÅ Landscape
Markhaven
- the perfect heating solution for greenhouses
Horticultural greenhouses operate with low return and high supply temperatures - conditions where CO₂ heat pump technology outperforms all other refrigerants. These temperatures match Danish district heating, where large-scale CO₂ heat pumps already deliver proven megawatt-scale results.
The case
Markhaven is a 32,000 m² horticultural greenhouse located in Denmark. Like many in the sector, the business has relied on natural gas for heating, but to reduce reliance on fossil fuels, Markhaven, in 2023, invested in an air-to-water CO₂ heat pump. The existing heating system already had an open accumulation (buffer) tank and manifold, which made it easy to integrate the new heat pump. “Many greenhouses are built like this,” explains
owner Klaus Søgaard. “We just added another unit to the manifold.”
CO₂ management is an essential factor in horticulture. During summer, when heat demand is lower, Markhaven prioritises CO₂ enrichment to stimulate plant growth - a standard practice in greenhouse horticulture. While this means the gas boilers are still used during certain periods, the heat pump reduces overall fossil fuel use and improves system flexibility. Over the year, the heat pump now covers around 50% of the heating demand, significantly lowering Markhaven’s carbon footprint without compromising crop performance.
Year: 2023
Model: H-1200 air-to-water heat pump
Capacity: 1.5 MW · 40°C/65°C return/flow (5°C/85% humidity)
Refrigerant: CO₂ (R744)
- natural, non-toxic, non-flammable
Defrost: Glycol
The heat pump
The heat pump is an H-1200 air-to-water, supplying 1.5 MW of heat and using CO₂ as a refrigerant. It is installed in a high-quality technical enclosure, which is a fully approved machine room with lighting, ventilation, CO₂ alarm and sound dampening panels. The enclosure was delivered with a concrete foundation, so only a levelled sand pad needed to be prepared on site for the installation.
Next to the heat pump and the existing accumulation tank, built in 1997, stand four evaporators that collect heat from the air. A glycol circuit, developed by Fenagy, ensures reliable defrosting through a unique control algorithm.
The heat pump has been in operation since January 2024 and supplies about 50% of the greenhouse heating demand, operating alongside the existing natural gas boilers (6.5 MW) and CO₂ fertilisation systems.
The accumulation tank - where heat can be stored when electricity is cheap - is a central part of the heating system. It is cycled daily - typically ranging from 15–20% to 80–85% full, and even more actively during winter when the load increases. “Even though the COP of the heat pump falls to around 2.75 when it’s cold outside, we make money with it in the winter,” says Klaus Søgaard.
Markhaven’s installation shows that even a relatively small project can deliver measurable energy savings and emissions reductions - and the same CO₂ heat pump technology can be scaled for greenhouses that are ten or twenty times larger.
“With the heat pump, we’ve chosen a solution that is both sustainable and reliable. Our production is now secure – even if the gas supply were to be interrupted. That gives us peace of mind in uncertain times.
Fenagy has delivered a solid product and provide excellent service. They have a lot of experience from similar projects – and I would choose them again without hesitation. For me, it’s also about taking responsibility and leading the way in the green transition.”
Klaus Søgaard · Markhaven Greenhouse
Ry District Heating Utility
– a flexible solution for a growing community
The case
Ry District Heating Utility provides heat to 95% of households in the Danish towns of Ry and Gl. Ry – a total of 3,450 consumers – with an annual production of 71,000 MWh and a peak load of 22 MW. The utility companies in the two towns merged in 2024 and are now connected by an 8.5 km transmission line.
Previously, Ry relied primarily on wood-chip boilers, while Gl. Ry was heated by a gas boiler. Today, the joint utility’s diverse and flexible energy mix includes an electric boiler, two wood-chip boilers, solar thermal collectors, a groundwater heat pump - and now, four high-efficiency CO₂ heat pumps supplied by Fenagy. Two oil boilers and a gas boiler are kept, but for back-up only.
The system in Ry is designed for maximum flexibility. Heat produced by the heat pumps and the electric boiler can either be fed directly into the district heating network or stored in two large accumulation tanks (5,000 m³ total) when electricity prices are low. In the summer, the solar thermal collectors and heat pumps provide most of the heat for the two towns. In winter, the wood-chip boilers supplement the system.
The shift to heat pumps and flexible electricity consumption has dramatically reduced fossil fuel dependency. As a result, the use of natural gas has been nearly eliminated – cutting CO₂ emissions by an estimated 80–100 tonnes annually. Additionally, the system contributes to grid balancing: the heat pumps and electric boiler can ramp output up or down in real time, helping to stabilise the grid and optimise energy costs.
Original site expanded with accumulation tanks
New nearby site with energy collectors and heat pumps
The heat pump
At the core of the new installation are four large H-2600 CO₂ air-to-water heat pumps, collectively delivering up to 9,4 MW at -1°C and as much as 12.3 MW when outdoor temperatures reach 15°C.
Each unit features six Bitzer 8-cylinder compressors and an integrated district heating pump.
The new heat pump facility is a state-of-the-art installation. Mounted on an 8-metre steel frame, 32 Güntner evaporators draw in ambient energy, even during the cold and humid Danish winters. A glycol circuit, developed and refined by Fenagy over three winters, ensures reliable defrosting through a unique control algorithm.
With a COP around 3, the heat pumps represent the most efficient and cost-effective heating option for most of the year. Combined with solar thermal energy and intelligent storage, they form a highly flexible system, capable of responding dynamically to changes in weather, electricity pricing and grid demand.
With population growth expected, the system is future-ready: Fenagy’s modular heat pumps make it easy to scale up capacity whenever needed – and the site in Ry has already allocated space for expansion.
Year: 2024
Heat pumps: 4 x H-2600 AW
Application: Air-to-water heat pumps
Heat capacity: 10 MW, 33 °C/70 °C hot water (5°C/85% humidity)
Heat source: Air
COP: 2.9
Accumulation tanks:
1500 + 3500 = 5000 m3
Nykøbing Sjælland
- district heating with flexible heat production and large energy storage
The case
In Nykøbing Sjælland, Denmark, four H-1800 air-source CO2 heat pumps enhance the district heating company’s heating system. The heating setup also includes a 10 MW electric boiler, a CHP unit and substantial energy storage in two accumulation tanks, ensuring optimal heat production regardless of the electricity price.
The energy storage holds 9,500 m³ of hot water, providing great flexibility to switch the units on and off in response to electricity price fluctuations, while consistently meeting the heating demands of approximately 2,000 consumers.
The heat pump
The heat pump installation consists of four standard H-1800 AW units and 24 evaporators, positioned in two groups of 12 opposite each other. The four H-1800 heat pumps are the first Fenagy units equipped with the highly efficient 70 m³/h 8-cylinder compressors from Bitzer. The heat pumps can start and stop in about 5 minutes and produce hot water up to 85°C, providing optimal flexibility for planning and operation.
The heat pumps were commissioned in 2023 and fully handed over to the customer after commissioning.
Year: 2023
Model: 3 x H-1800 AW
Application: Air-to-water heat pump
Capacity:
7.9 MW
42°C/70°C hot water (5°C/85% humidity)
Heat source: Air
COP: 3.0
Defrost method: Glycol
Fårevejle
- combined wastewater and air-source heat pump for district heating
The case
In Fårevejle, Denmark, a brand new district heating network is heated by a combination of air and wastewater. The wastewater heat pump handles the base load, while the air-source heat pump steps in if the demand exceeds the wastewater system’s capacity.
The heat pump
The heat pump installation consists of two standard H-1800 AW units and one H-1200 WW unit. The wastewater system includes two accumulation tanks from which energy is extracted. Before the water enters a water-to-water heat exchanger, it is filtered through a self-cleaning filter. Additionally, the heat exchanger is equipped with a clean-in-place system, ensuring reliable and stable operation. The wastewater can be cooled down to around 2°C allowing maximum energy to be extracted.
The heat pump was commissioned in 2023 and fully handed over to the customer after commissioning.
Year: 2023
Model:
2 x H-1800 AW · 1 x H-1200 WW
Application:
Air-to-water and water-to-water heat pump
Capacity:
AW: 3.5 MW · WW: 1.3 MW
40°C/70°C hot water (5°C/85% humidity)
Heat source: Air and wastewater
COP: AW: 2.9 · WW: 3.05
Defrost method: Glycol
Vildbjerg
- exploiting the fluctuating electricity market with large-scale air-source heat pump
The case
In Vildbjerg, Denmark, three H-1800 air-source CO2 heat pumps complete the district heating company’s heating system. Alongside these heat pumps, the setup includes a 12 MW electric boiler, two 3.5 MWe CHP units, solar heat collectors and substantial energy storage in two hot water energy accumulators. Together, they ensure optimal heat production regardless of electricity prices.
The energy storage holds approximately 7,000 m³ of hot water, providing significant flexibility to switch units on and off in response to electricity price fluctuations while reliably meeting the heating needs of around 2,000 consumers.
The heat pump
The heat pump installation consists of three standard H-1800 AW units, each with six evaporators, positioned side by side. Thorbjørn Madsen, Director at Vildbjerg Technical Works, expresses his excitement about the installation, saying: “The heat pump optimises our existing electric boiler and CHP units, enabling us to exploit the advantages of the fluctuating electricity market”.
Due to special wind and weather conditions, the units have even produced snow while generating heat. This is just one example of the way large-scale air-source heat pumps can interact with the forces of nature, and why our technical experience and intelligent control systems are essential to ensure reliable, stable operation without unforeseen issues.
The heat pump was commissioned in 2023 and fully handed over to the customer after commissioning.
Year: 2023
Model: 3 x H-1800 AW
Application: Air-to-water heat pump
Capacity:
7 MW, 35°C/68°C hot water (5°C/85% humidity)
Heat source: Air
COP: 3.2
Defrost method: Glycol
Turning data center waste
heat into district heating
YEAR: 2025
MODEL: 6 x HCI-3000 (1st phase)
APPLICATION: Combined heating and cooling
CAPACITY: 18 MW -> 30 MW
HEAT SOURCE: Excess heat from data center
The case
Fenagy has partnered with Finnish contractor Caverion to supply six isobutane/propane heat pumps to a utility company providing district heating to a city in the north-east of Finland. These heat pumps will enable the recovery of excess heat from a nearby data center and supply it into the district heating network.
The district heating plant is located near a large data center, which operates year-round and continuously generates excess heat from server room cooling. Traditionally, this heat was removed using dry coolers and thus became waste heat. By connecting heat pumps to the existing cooling water circuit, the system can now both provide cooling and recover the excess heat for district heating. The old chillers will remain in place but will only be used as a backup when needed.
Data centers require cooling throughout the year, which makes them a stable and reliable heat source - an ideal match for heat pumps. In winter, the heat pumps recover waste heat for the city’s residents; in summer, excess heat is released via the existing dry coolers.
The heat pumps
The heat pumps are customised HCI-3000 units designed to provide both heating and cooling. Each heat pump has three compressors, two using isobutane as a refrigerant and one using propane.
The excess heat from the data center is around 30°C. The heat pumps raise this to approximately 85°C to meet district heating requirements. On the cold side, they provide 20°C water for server room cooling, independent of the return temperature from the district heating network, which in this case is about 50°C.
Both isobutane and propane are highly efficient refrigerants. They are natural, PFAS-free and have an extremely low global warming potential.
When the system is fully implemented, it can deliver more than 30 MW of heat.
Sector integration · No heat wasted
Optimal energy efficiency
HCI-3000 - a modular heat pump solution
Customer testimonials
“Has the technology been reliable thus far, or have you had many issues with breakdowns etc.?”
Combined heating and cooling for biogas production
The case
The biogas plant in Tønder, Denmark, will be one of the largest plants in Europe when completed. Annually, it will process 900,000 tons of agricultural feedstock and industrial organic waste and produce 40 million Nm³ of biomethane, equivalent to 400 GWh per year – enough to cover the annual energy consumption of 20,000 households.
The biogas production process begins with feedstock from local farmers being delivered and loaded into storage tanks. Once inside, the feedstock is heated by an HCI heat pump to stimulate the production of biogas. The generated biogas then goes through a purification process, and once upgraded, it can be fed into the natural gas grid, replacing natural gas and contributing to a sustainable energy supply.
The remaining feedstock, after processing and gasification, is cooled by the HCI heat pump system. This cooling step captures the remaining energy and converts the degassed feedstock into an eco-friendly fertilizer. Essential nutrients are preserved, odour is reduced and the fertilizer is ready for use on fields.
The heat pump
The installation includes three HCI-3000 heat pumps, using isobutane as a refrigerant. Each HCI-3000 unit is installed in a sound-dampening enclosure, ventilated by an EX-fan to ensure a negative pressure and maintain the right temperature in the cabinet. The entire system is controlled by a Siemens PLC with added Fenagy algorithms for the most essential functions.
HCI heat pumps can deliver supply temperatures up to 95°C. The heat pumps have been commissioned and in operation since the summer of 2024. Tønder Biogas plant will be completed in 2025.
Year: 2024
Model: 3 x HCI-3000
Application: Water-to-water heat pump
Capacity: 5-7 MW
Heat source: Water
Refrigerant: Isobutane
Sector integration in the city
- waste heat from district cooling recovered for district heating
The case
In the heart of Copenhagen, a historic building is home to a new Fenagy heat pump installation by HOFOR, a key district heating and cooling provider in the city. This heat pump is the first of 10 planned units, which together are expected to replace up to one-third of the biomass currently used for heating and will eventually provide heat to approximately 130,000 apartments.
The heat pump utilises waste heat from HOFOR’s district cooling facility at the same location. In the summer, excess heat in the district heating network can be rejected into seawater taken from the city harbour. As the electricity used comes from wind and solar energy, the project is an excellent example of effective sector integration.
The heat pump
The heat pump installation consists of two H-1800 WW units and one H-1200 WW unit, customised to meet the specific requirements of this unique location, which has very limited space and strict noise regulations. The racks are slightly shorter than usual, with larger pumps integrated on both the cold and warm sides. Additionally, the compressor compartments are sound attenuated using specially designed panels, reducing noise levels from Lw = 105 dB(A) by 4-5 dB. The heat pumps are equipped with special vibration-reducing machine feet to prevent vibrations from being transferred to the machine room.
The three racks are positioned at two levels on a steel frame. The heat pump uses CO2 as a refrigerant, which is an optimal choice for a mid-city location in terms of safety. It supplies heat to approximately 2,500 homes in Copenhagen.
The heat pump was commissioned in the autumn of 2024 and was fully handed over to the customer after commissioning.
Year: 2024
Model:
2 x H-1800 WW · 1 x H-1200-WW
Application:
Combined district cooling and district heating
Capacity: 3.3 MW cooling · 4.9 MW heating
47°C/75°C hot water, 12.5/5.5 cold water
Heat source: Water
COP: 2.7
Sector integration with
combined heating and cooling
The case
IKEA Aalborg aimed to replace its four aging HFC refrigeration systems with a carbon-neutral solution. Aalborg District Heating then proposed a partnership to combine heating and cooling through sector integration.
They now have a Fenagy air-to-water heat pump with a chiller module for air conditioning, installed by Krebs A/S. IKEA enjoys efficient air conditioning in the summer, while capturing waste heat from this process and feeding it into the district heating grid. In colder months, the heat pump uses air as a heat source to provide heating for both IKEA and the district heating network.
The heat pump
The H-1200 AW/WW heat pump, using CO2 as a natural refrigerant, is designed to provide flexible cooling and heating. It is housed in a Priess enclosure and equipped with Fenagy’s advanced ejector technology, FenEject, with an automated PLC system that optimises capacity, chiller, evaporator and defrosting operations.
The installation includes four energy collectors (250 kW each) installed on 2-metre legs on a concrete foundation. Below the collectors is a drainage system to manage condensate during defrosting. With a summer cooling capacity of 750 kW, the system fully meets IKEA’s cooling needs while also contributing waste heat to the district heating grid.
This installation is a prime example of sector integration, demonstrating how combining heating and cooling contributes to a more sustainable energy future.
Year: 2022
Model: H-1200 AW/WW
Application:
Air-to-water and Water-to-water heat pump
Capacity (heat):
1200 kW (5 °C evaporation, 72/40 °C hot water)
Capacity (cooling): 8/13 °C
Heat source: Air
COP: 3
Defrost method: Glycol
“We experience that district cooling becomes more and more sought after. The energy centre at IKEA is prepared for more customers in the area to connect - and there is great interest in that – just as district cooling is also expanding elsewhere in Aalborg.”
– Aalborg Utilities
District heating company expands existing biomass-based production in Sdr. Felding
The case
The district heating company in Sdr. Felding, Denmark, has expanded its existing biomass-based production facilities with the integration of a large heat pump, a sizable buffer tank and a 10MW electrical boiler. This visionary installation exemplifies the future of district heating, which will be emission-free, and the installation serves as an important player in balancing the electrical grid. Notably, it has the capability of absorbing large quantities of green electricity during periods of abundance, and then utilising the stored energy from the tank during times when the electricity supply is lower than the demand.
The heat pump
Fenagy has provided two H1800 air-sourced heat pumps, including 12 flatbed evaporators, and the installation is executed by Krebs A/S. The heat pumps are equipped with Fenagy’s latest ejector technology, FenEject, optimised evaporators, and controlled by a Fenagy PLC, which has algorithms for capacity control, evaporator control and defrost. The control system can start and stop the machines so fast that they are well-suited and relevant for electrical grid balancing.
Year: 2022
Model: 2 x H-1800 AW
Application: Air-to-water heat pump
Capacity (heat):
3.5 MW (0° C ambient, 35/70° C hot water)
COP: 2.96
Defrost method: Glycol
Transportable air-source
heat pump
The case
Fenagy’s very first heat pump – a 600 kW air-to-water unit – was developed and designed during the autumn of 2020.
The heat pump was installed at a biomass-fired district heating system in a small city outside Aarhus, where it operated in combination with a straw boiler and oil boilers for peak load and back-up. The heat pump served as both a test unit and a demonstration unit.
The heat pump
Fenagy received DKK 250,000 in support from the Green Investment Pool, and Kredsløb utility company in Aarhus purchased the heat from the heat pump for the district heating network. During the test period, Fenagy paid a fixed price
for electricity, and Kredsløb paid a fixed price for the heat. When this agreement expired, the operation of the heat pump needed to be changed in order to still be cost-effective, and as the demonstration site had fulfilled its purpose, Fenagy decided to move the heat pump.
Moving the unit
In 2023, the heat pump was sold and moved to a different district heating plant in Djursland, Trustrup/Lyngby, where it supplies heat to the small town Balle – approx. 50 kilometres away from the original site. The move was done in just 2-3 weeks showing that a factory-built unit from Fenagy provides a great opportunity to buy a mobile unit for consumers in areas where a transmission line for district heating has not yet been established. They can buy a heat pump first and then connect to the district heating once this is established.
Year: 2021/2023
Model: H-600 AW
Application: Air-to-water heat pump
Capacity (heat): 600 kW
(5°C ambient, 40/70°C hot water)
Heat source: Air
COP: 2.9
Defrost method: Glycol
Mejlby District Heating installs a heat pump in the middle of
a residential area
The case
The district heating company in Mejlby has expanded its production facilities with an electrically driven heat pump. They wanted a heat pump for base load operation to reduce gas consumption. The existing gas boiler now serves as back-up and for peak load operation. Together with their gas driven CHP system, they can now produce cheap heat, both when the electricity price is high and low
The heat pump
The heat pump is installed in a Fenagy premium enclosure, delivered plug-and-play, and placed outside the existing buildings on the site. The enclosure is soundproof, ensuring that the 35 dB(A) noise requirements of the residential area, where Mejlby district heating is located, are met. Outside air evaporators are installed right next to the heat pump enclosure and run silently.
The heat pump is running almost constantly because the gas boiler alternative is more expensive to operate, but in periods with high electricity prices, the existing gas motor can be used to produce electricity, and the heat pump can be shut down.
The heat pump is a standard CO2 air-to-water heat pump, equipped with the latest Fenagy ejector technology, FenEject, and controlled by the Fenagy PLC with algorithms for capacity control, evaporator control and defrost.
Year: 2022
Model: H-1200 AW
Application: Air-to-water heat pump
Capacity (heat): 1.3 MW
(0°C ambient, 32/70°C hot water)
Heat source: Air
COP: 3.34
Defrost method: Glycol
Combined heat and power plant in Haderup
The case
Haderup Utility Company provides the city with district heating from a setup that comprises a combination of a heat pump, a gas motor, a gas boiler (CHP) and solar heat. The peak load on the demand side is 1.8 MW.
The operation depends on the heat demand from the consumers, the stored energy, the electricity prices and system services related to balancing the electrical grid. This makes the plant at Haderup Utility Company both efficient and flexible. The heat pump uses the latest ejector technology and together with the parallel compression, it results in an SCOP around 3.0.
The heat pump
The heat pump is installed inside the main building, positioned in a dedicated machine room next to the gas boiler and gas engine. It is equipped with the latest Fenagy ejector technology, FenEject, and controlled by the Fenagy PLC with algorithms for capacity control, evaporator control and defrost.
Year: 2021
Model: H-1200 AW -4+4B
Application: Air-to-water heat pump
Capacity (heat): 1.2 MW (5 °C ambient)
Heat source: Air
Defrost method: Glycol
COP: 2.84
“It will provide Feldborg and Haderup with a stabilization of
the heating cost by adding a fourth production unit.”
– Thorbjørn Madsen, Director - Vildbjerg Technical Facilities
CO2 cooling and freezing for Liertoppen logistics centr
The case
Liertoppen is an 18,500 m3 logistics centre for Oda in Oslo, which is the largest online food distributor in Norway. In collaboration with Therma Industri A/S, Fenagy has provided a cooling and freezing application to the storage and packing area at the distribution centre.
The units
Fenagy has delivered two chiller units and a freezing unit. One of the chiller units provides 800 kW glycol at -2/-6 °C, and the other is providing 800 kW chilled water at 10/5 °C. Both units are installed with a heat recovery system. The freezing unit is connected to the glycol chiller, providing 100 kW freezing capacity at -32 °C evaporator temperature. The installation is controlled by FenControl ensuring a stable and efficient control and monitoring of the installation.
Year: 2021
Model: 2 x C-1000
Application:
Cooling and freezing application with heat recovery
Capacity (kW): 100 kW freezing DX -32 °C,
800 kW cooling (30% glycol) -2/-6 °C and
800 kW cooling 10/5 °C
Air-to-water heat pump supplying heat for greenhouse
The case
Kronborg is a Danish horticulture company with a 45,000 m2 greenhouse. The company wished to be able to produce heat for the greenhouse during wintertime, and this is now in place with an energy-efficient heat pump using the natural refrigerant CO2.
The heat pump
A standard Fenagy heat pump is built on a rack. It is placed in a machine room on the customer site and connected to the central heating system on the hot side. The heat pump rack is connected to four evaporators, which are located outside. The system is equipped with the latest Fenagy ejector technology, FenEject, and controlled by the Fenagy PLC with algorithms for capacity control, evaporator control and defrost.
Year: 2022
Model: H-600 AW
Application: Air-to-water heat pump
Capacity (heat):
632 kW (5 °C ambient, 30/60 °C hot water)
Heat source: Air
COP: 3.7
Defrost method: Glycol
Air-to-water heat pump combined with a wood chip boiler and storage tank in Vestervig
The case
The district heating company in Vestervig has expanded its production facilities with an electrically driven heat pump and a large water storage tank. They wanted to be less dependent on the wood chip boilers and be able to shut down the boilers for maintenance during summer. Due to limited space and a location in the town centre, low noise and prevention of cold air recirculation were high priorities. For this reason, the evaporators are elevated 5 metres above the ground with noise barriers installed around them.
The heat pump
The heat pump is installed in a Fenagy premium sound enclosure outside the existing buildings. It is equipped with the latest Fenagy ejector technology, FenEject, and controlled by the Fenagy PLC with algorithms for capacity control, evaporator control and defrost. The measured capacity without defrost is 1,493 kW with an ambient temperature of 6.5 °C, hot water temperatures 33/70 °C and a relative humidity of 70%. This gives the heat pump a COP of 3.05.
Year: 2021
Model: H-1200 AW 3+3D
Application: Air-to-water heat pump
Capacity (heat): 1.2 MW (5 °C ambient,
36/70 °C hot water)
Heat source: Air
COP: 2.8
Defrost method: Glycol
Air-to-water heat pump in enclosure in Havneby
The Case
The district heating company in Havneby, Rømø, has expanded its production facilities with the integration of an electrically driven heat pump. The heat pump was an extension of the existing setup consisting of two wood chip boilers and an oil boiler on Havneby’s site, providing heated water to the accumulation tank. As the heat pump is installed in the harbour area where there is risk of flooding during westerly storms, the entire structure with the enclosure, electrical transformer and the evaporators is elevated approximately 100 cm above the ground.
The heat pump
The heat pump is installed in a Fenagy premium sound enclosure outside the existing buildings. It is equipped with the latest Fenagy ejector technology, FenEject, and controlled by the Fenagy PLC with algorithms for capacity control, evaporator control and defrost.
Year: 2022
Model: H-600 AW
Application: Air-to-water heat pump
Capacity (heat): 653 kW
(11 °C ambient, 38/70 °C hot water)
Heat source: Air
COP: 3.2
Defrost method: Cold gas