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Analysis of a directly gas-fired absorption heat pump with an improved condensing boiler technology. 

Number: No 193

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

Summary

Residential heating is one of the most important factors for the reduction of fossil energy consumption and CO2 emissions. A relevant contribution can be expected from directly gas-fired ammonia/water absorption heat pumps (GAHP) when it comes to the replacement of traditional condensing boilers in cold and moderate climatic regions (e.g. Europe). Especially in old buildings, the return flow temperature of the heat distribution system is above the dew point of the flue gas, thus water vapor condensation of the flue gas cannot take place in the flue gas heat exchanger. To ensure water vapor condensation under all operating conditions the flue gas can be cooled by the refrigerant in a refrigerant cooled flue gas heat exchanger, installed between the evaporator and the absorber. A GAHP with a nominal heating capacity of 18 kW was equipped with a water cooled and a novel refrigerant cooled flue gas heat exchanger to experimentally investigate the achievable increase in efficiency by means of the refrigerant cooled flue gas heat exchanger. The GAHP was operated at different heat source temperatures and different cycle configurations. 

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Pages: 10 p.

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  • Original title: Analysis of a directly gas-fired absorption heat pump with an improved condensing boiler technology. 
  • Record ID : 30030033
  • Languages: English
  • Subject: Technology
  • Source: 13th IEA Heat Pump Conference 2021: Heat Pumps – Mission for the Green World. Conference proceedings [full papers]
  • Publication date: 2021/08/31

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