Solar assisted R22 and R134a heat pump systems for low temperature applications
Conference
·
OSTI ID:474352
- Helwan Univ., Cairo (Egypt)
The results of the simulations for a conventional heat pump, a conventional solar air heater and two serial solar assisted heat pump (SAHP) systems are presented in this paper. The thermodynamic properties of R22, R404a and R134a are given in the form of correlations with correlation factors higher than 0.99. The performance characteristics of the heat pump are investigated using these working refrigerants, for wide ranges of evaporator temperature (0--45 C), condenser temperature (50--70 C) and air mass flow rates (500--2,000 kg/hr). The comparison of the heat pump performance for the considered working refrigerants proved that, R134a is the most promised alternative to R22 for low temperature applications. This is confirmed by 22% increase in the coefficient of performance for R134a over R404a. The operating conditions and the performance of both the conventional solar air heater and SAHP systems have been evaluated round the year using the meteorological data of Cairo (latitude of 30{degree}N). Comparison between performance of the SAHP systems, conventional heat pump or conventional solar air heater, shows that the SAHP systems provide better characteristics over the conventional systems. Moreover, the SAHP system in which heated air flows from the collector to the evaporator, then through the condenser is preferable. This system using R134a gives an increase of more than 50% in the coefficient of performance of the heat pump and saving of 21% in the collector area.
- OSTI ID:
- 474352
- Report Number(s):
- CONF-960805--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Performance prediction of refrigerant-DMF solutions in a single-stage solar-powered absorption refrigeration system at low generating temperatures
Study of heat pump performance using mixtures of R32/R134A and R32/R125/R134A as drop-in' working fluids for R22 with and without a liquid-suction heat exchanger
Evaporation characteristics of R22 flowing inside a corrugated tube
Journal Article
·
Sat Nov 14 23:00:00 EST 2009
· Solar Energy
·
OSTI ID:21236007
Study of heat pump performance using mixtures of R32/R134A and R32/R125/R134A as drop-in' working fluids for R22 with and without a liquid-suction heat exchanger
Technical Report
·
Tue Nov 30 23:00:00 EST 1993
·
OSTI ID:7187554
Evaporation characteristics of R22 flowing inside a corrugated tube
Technical Report
·
Wed Jul 01 00:00:00 EDT 1992
·
OSTI ID:10150181