|Author||Huang, B. J.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|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.|
|Learning Resource Type||Article|
|Publisher Place||United States|
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