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Experiment and simulation of two-stage compression air-source heat pump water heater.

Author(s) : WU W. B., JIN S. M.

Summary

The air-source heat pump (ASHP) water heater is a device for hot water in which heat is absorbed from air by a heat pump. Power consumption is low. However, there are some disadvantages related to ordinary single-stage heat pumps used in low-temperature environments, such as high compression ratio, scarce heating ability and low efficiency. Two-stage compression refrigeration cycle was put forward to use in the air-source heat pump to improve the low temperature adaptability of ASHP in this paper. Combining the single stage heat pump, a two-stage compression air-source heat pump water heater was designed, and the experimental instrument of prototype had been built up for experimental study. The results of actual tests showed that, compared with single-stage compression cycle, the compression ratio of two-stage cycle's was much less, and the heating ability was generally higher. The COP of the two-stage system could keep to about 1.5 when the environmental temperature dropped to -20°C. The lumped parameters steady model was built for the two-stage compression air-source heat pump water heater, and the simulated results were in good agreement with the measured data.

Details

  • Original title: Experiment and simulation of two-stage compression air-source heat pump water heater.
  • Record ID : 2009-0818
  • Languages: English
  • Source: Cryogenics and refrigeration. Proceedings of ICCR'2008.
  • Publication date: 2008/04/05

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