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Experimentally-based modelling of a gas-fired absorption heat pump with a refrigerant-cooled flue gas heat exchanger.

Number: 0151

Author(s) : WAGNER P., RIEBERER R.

Summary

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.

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  • Original title: Experimentally-based modelling of a gas-fired absorption heat pump with a refrigerant-cooled flue gas heat exchanger.
  • Record ID : 30029743
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
  • Publication date: 2022/06/13
  • DOI: http://dx.doi.org/10.18462/iir.gl2022.0151
  • Document available for consultation in the library of the IIR headquarters only.

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