Thermal performance representation and testing of air solar collectors

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Journal titleJournal of Solar Energy Engineering
Pages7481; # of pages: 8
Subjectsolar collectors; air leakages; plate-type air collector; ashrae standard 93-1986 recommended flow rates; inlet gage pressures; collector leakage; design flow rate
AbstractThe thermal performance of a plate-type air collector was evaluated experimentally. Tests were performed at the two ASHRAE Standard 93-1986 recommended flow rates and at a variety of inlet gage pressures to cover three possible cases of collector leakage (inward, outward, inward- outward). These tests show that the thermal performance of air collectors depends on flow rate and inlet gage pressure (or the associated leakage rate). If the collector is used at an inlet gage pressure near atmospheric pressure as is often the case in the no-storage type of systems, then it is recommended to test the collector at an inlet gage pressure of zero. For collectors operating at various inlet gage pressures it is suggested to test them at three inlet gage pressures. As for the test flow rate, the present work confirmed the results of other studies and emphasizes the need to test the collectors at the design flow rate. Three methods of thermal performance representation were used and compared: One method bases the efficiency on the inlet flow rate, another on the outlet flow rate, and the third involves an overall enthalpy balance. When plotted in the classic way, that is, n vs. (Ti- Ta)/G the three methods exhibit significant differences, especially for the inward leakage case. An uncertainty analysis on the data obtained for this study indicates that for the inward leakage case, unacceptable uncertainties occur at high values of (Ti - Ta)/G.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number29852
NPARC number20386242
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Record identifier32b6c30b-595d-484c-8d54-9ae30f25213a
Record created2012-07-25
Record modified2016-05-09
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