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Test results for an absorption heat pump with adjustable composition.

Author(s) : TREFFINGER P., PETER T.

Summary

A test rig of an advanced absorption heat pump (AHP) for domestic heating has been built and tested in steady-state operation. The AHP is intended to replace conventional boilers used in hot water heating systems. To permit operation with air as a heat source (temperature below 0 °C), ammonia-water has been chosen as the working pair. The AHP is designed for a maximum heating capacity of 20 kW (68000 Btu/h) at -15 °C. The maximum hot water temperature is 55 °C. The burner, the solution valve, and the expansion valve are continuously adjustable. The storage allows shifting the mass fraction of the strong solution from 17 to 50 mass%. The combined partial-condenser/solution heat exchanger works well at mass fractions from 25 to 50 mass%. This corresponds to heat source temperatures from -10 to 10 °C, whereby a maximum hot water temperature of 55 °C is possible. Within this range, the process heating coefficient of performance varies from 1.4 to 1.7.

Details

  • Original title: Test results for an absorption heat pump with adjustable composition.
  • Record ID : 2000-1842
  • Languages: English
  • Source: ASHRAE Transactions. 1999 Winter Meeting, Chicago, Illinois + CD-ROM.
  • Publication date: 1999
  • Document available for consultation in the library of the IIR headquarters only.

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