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Author Huang, B. J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword SOLAR ENERGY ♦ PASSIVE SOLAR WATER HEATERS ♦ STANDARDS ♦ THERMOSYPHONS ♦ PERFORMANCE ♦ THERMAL EFFICIENCY ♦ REGRESSION ANALYSIS ♦ SOLAR INDUSTRY ♦ THERMOSYPHON EFFECT ♦ APPLIANCES ♦ CONVECTION ♦ EFFICIENCY ♦ ENERGY TRANSFER ♦ EQUIPMENT ♦ HEAT TRANSFER ♦ HEATERS ♦ INDUSTRY ♦ MASS TRANSFER ♦ MATHEMATICS ♦ SOLAR EQUIPMENT ♦ SOLAR WATER HEATERS ♦ STATISTICS ♦ WATER HEATERS ♦ Solar Thermal Utilization- Water Heating
Abstract A rating method for the thermal performance of thermosyphon solar water heaters was developed. Except that the outdoor test procedure still follows the Taiwan Standard CNS B7277, a system characteristic efficiency [eta][sub s]* which is defined as the [alpha][sub o], value corrected at M/A[sub c]= 75 kg/m[sup 2], was derived so that [eta][sub s]* is independent of the M/A, ratio. Here,[eta][sub s]* can be evaluated by linear regression analysis of the test data. It is found from a series of tests for 31 systems that [eta][sub s]* is independent of M/A[sub c] indeed, and thus can be used to rate the thermal performance of different thermosyphon solar water heaters during the energy-collecting period. The cooling loss during the no-radiation period is rated by the system cooling time constant [tau][sub c]. The present rating method associated with the Taiwan Standard CNS B7277 has been implemented for more than three years and is accepted by the Taiwan solar industry.
ISSN 0038092X
Educational Use Research
Learning Resource Type Article
Publisher Date 1993-05-01
Publisher Place United States
Journal Solar Energy
Volume Number 50
Issue Number 5


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