## Effect of Flow Rate

Experimental test data can be correlated to give values of FR(ja)n and FRUL for a particular flow rate used during the test. If the flow rate of the collector is changed from the test value during normal use, it is possible to calculate the new Fr for the new flow rate using Eq. (3.58). A correction for the changed flow rate can be made if it is assumed that F' does not change with flow rate, because of changes in hfi. The ratio r, by which the factors (toi)„ and FRUL are corrected, is given by (Duffie and Beckman, 1991):

FRUL use

FRUL test FR (Ta)n test

UlF'AC

FRUL I test

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