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Biomass-driven small-capacity ammonia/water absorption heat pump for heating and cooling.

Author(s) : MOSER H., RIEBERER R.

Type of article: Article

Summary

This paper describes the development, system layout and test results of a biomass driven small-capacity ammonia/water absorption heat pumping unit (heating capacity 15 kW), which is designed for both heating and cooling purpose in order to reduce the energy demand for heating and to increase the share of renewables in the cooling/refrigeration sector. Standard plate-type heat exchangers have been used in the absorption heat pump for all heat exchangers, including the absorber and generator, in order to reduce first costs. A standard biomass boiler has been modified to operate at higher supply temperatures, using oil as the heat carrier to the absorption heat pump. The system has been tested at different operating conditions. The experimental results and a mathematical model show an approximately linear correlation between the temperature lift and the COP of the absorption heat pump. The calculated COPH for heating varies from about 1.75 to 1.4, depending on the temperature lift. The experimental results show a similar correlation, but slightly below the results of the mathematical model. The efficiency of the biomass boiler decreases approximately linearly with increasing supply temperature: for steady-state operation at full load the efficiency was about 92% at 100°C, falling to about 80% at 180°C supply temperature.

Details

  • Original title: Biomass-driven small-capacity ammonia/water absorption heat pump for heating and cooling.
  • Record ID : 2008-1369
  • Languages: English
  • Source: IEA HPC Newsl. - vol. 25 - n. 4
  • Publication date: 2007

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