Proceedings
OA Policy
English

Monovalent and Hybrid Air-source Heat Pump Concepts for Existing Multifamily Buildings – Energy Performance and CO₂ Savings

Number of pages12 p.
PublisherGenève
First online date2023-05-15
Abstract

Heat pump suppliers only propose hydronic concepts for buildings up to 15 kWth, and very few suggest diagrams for large air-source heat pumps (> 50 kWth) in existing multifamily building. This paper analyses the energy and environmental performance of hybrid diagrams adapted to existing and large multifamily buildings via a validated numerical simulation model. The concepts correspond to different fuel-switch scenarios with the possibility of using existing boilers as a back-up. For each concept, sensitivity analysis assesses the impact of different levels of heat demand and heat pump capacity. As a result, over the different scenarios, the seasonal performance of the heat pump varies between 2.8 and 3.3, and the overall performance (heat pump and boiler) between 1.5 and 2.9. Considering the hourly CO₂eq content of the Swiss electricity mix, emissions of hybrid systems are 1.4 to 2.2 times higher than with a monovalent system. However, they remain 2.3 to 3.5 times lower than a gas boiler, which points out their adequacy as a transitional solution to proceed to a fuel-switch before retrofitting the building envelope.

Keywords
  • Air-source heat pump
  • Multifamily building
  • Monovalent and hybrid systems
  • Energy performance and CO₂ savings
Note14th IEA Heat Pump Conference, 15-18 May 2023, Chicago, Illinois
Citation (ISO format)
MONTERO DOMINGUEZ, Omar et al., (eds.). Monovalent and Hybrid Air-source Heat Pump Concepts for Existing Multifamily Buildings – Energy Performance and CO₂ Savings. Genève : [s.n.], 2023.
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Proceedings (Published version)
accessLevelPublic
Identifiers
  • PID : unige:169365
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Technical informations

Creation25/05/2023 12:00:44
First validation07/06/2023 12:40:37
Update time07/06/2023 12:40:37
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