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Refrigerant‐charged integrated solar water heater
Author(s) -
Radhwan Abdulhaiy M.,
Zaki Galal M.,
Jamil Arshad
Publication year - 1990
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440140407
Subject(s) - natural circulation , refrigerant , condenser (optics) , buoyancy , thermosiphon , environmental science , storage water heater , mechanics , heat transfer , thermodynamics , circulation (fluid dynamics) , materials science , nuclear engineering , mechanical engineering , engineering , heat exchanger , physics , water heater , optics , inlet , light source
The performance of two R‐11‐charged integrated solar water heater collectors was investigated experimentally for forced and natural circulation water flows. The heat transfer from the refrigerant loop to the hot water storage tank took place through a condenser of novel design integrated within the collector frame. The effect of the condenser inclination on the system efficiency was remarkable for natural circulation water flow but had no significant effect for forced circulation flow. The difference in thermal response between the refrigerant and water loops caused buildup of stored energy in the condenser. This energy affected the buoyancy forces and generated flow pulsation that caused a harmonic‐like variation of the system efficiency. This effect vanished with forced water circulation flow. The system efficiency varied between 20 and 50% depending on the solar insolation.