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Solar-assisted R22 and 134a heat pump systems for low-temperature applications.

Author(s) : ABOU-ZIYAN H. Z., AHMED M. F., METWALLY M. N., HAMEED H. M. A. el-

Type of article: Article

Summary

The results of the simulations for a conventional heat pump, a conventional solar air heater and two serial solar-assisted heat pump systems (SAHP) are presented in the paper. For wide ranges of evaporator temperature (0-45 deg C), condenser temperature (50-70 deg C) and air mass flow rates (1000-2000 kilogrammes/hour), the comparison of the heat pump performance proved that R134a is a more promising alternative to R22 for low-temperature applications than R404A. The operating conditions and the performance of both the conventional solar air heater and SAHP systems have been evaluated over 1 year using the meteorological data of Cairo (latitude of 30 degree North). SAHP systems provide better characteristics over the conventional systems. The SAHP system in which heated air flows from the collector to the evaporator, then through the condenser, is preferable.

Details

  • Original title: Solar-assisted R22 and 134a heat pump systems for low-temperature applications.
  • Record ID : 1998-1913
  • Languages: English
  • Subject: General information
  • Source: Applied Thermal Engineering - vol. 17 - n. 5
  • Publication date: 1997/05

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