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Abstract
Gas-fired ammonia/water absorption heat pumps (GAHPs) for heating applications have a significantly higher efficiency compared to commonly used condensing boilers, thus a GAHP can substantially contribute to the reduction of greenhouse gas emissions in the building sector.
Within the scope of this work a GAHP with a nominal heating capacity of 18 kW was equipped with a standard water-cooled flue gas heat exchanger and a novel refrigerant-cooled flue gas heat exchanger. Especially in retro-fit applications, the temperature in the heating system is too high to condensate water vapour via a water-cooled flue gas heat exchanger which can be overcome by a refrigerant-cooled one. A simulation model based on mass, species and energy balances as well as assumptions derived from experimental results of a GAHP with both flue gas heat exchanger types was set-up using the software Engineering Equation Solver (EES). The results have shown an efficiency of the GAHP of up to 1.9 and an increase in efficiency of up to 9 % by using a refrigerant-cooled instead of a water-cooled flue gas heat exchanger.
Within the scope of this work a GAHP with a nominal heating capacity of 18 kW was equipped with a standard water-cooled flue gas heat exchanger and a novel refrigerant-cooled flue gas heat exchanger. Especially in retro-fit applications, the temperature in the heating system is too high to condensate water vapour via a water-cooled flue gas heat exchanger which can be overcome by a refrigerant-cooled one. A simulation model based on mass, species and energy balances as well as assumptions derived from experimental results of a GAHP with both flue gas heat exchanger types was set-up using the software Engineering Equation Solver (EES). The results have shown an efficiency of the GAHP of up to 1.9 and an increase in efficiency of up to 9 % by using a refrigerant-cooled instead of a water-cooled flue gas heat exchanger.
Original language | English |
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Title of host publication | Proc. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings |
DOIs | |
Publication status | Published - 2022 |
Event | 15th IIR Gustav Lorentzen Conference on Natural Refrigerants: GL 2022 - Trondheim, Norway Duration: 13 Jun 2022 → 15 Jun 2022 |
Conference
Conference | 15th IIR Gustav Lorentzen Conference on Natural Refrigerants |
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Abbreviated title | GL 2022 |
Country/Territory | Norway |
City | Trondheim |
Period | 13/06/22 → 15/06/22 |
Fingerprint
Dive into the research topics of 'Experimentally-based modelling of a gas-fired absorption heat pump with a refrigerant-cooled flue gas heat exchanger'. Together they form a unique fingerprint.Projects
- 1 Finished
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FluePump - Efficiency enhancement for gas fired absorption heat pumps by means of a refrigerant-cooled flue gas condenser
Rieberer, R. (Co-Investigator (CoI)) & Wagner, P. (Co-Investigator (CoI))
1/06/16 → 30/11/18
Project: Research project
Research output
- 1 Doctoral Thesis
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Development and integration of a refrigerant-cooled flue gas heat exchanger in a gas-fired absorption heat pump
Wagner, P., 2023, (In preparation)Research output: Thesis › Doctoral Thesis