What size FPC is needed to supply a familys domestic hot water needs in March in Denver, Colorado? Assume 80 gallons per day are needed (1 gal 5 8.3 lb) for the water and that the collectorheat exchanger system has an average effi ciency of 40%. Th e collector tilt angle is equal to the latitude. (See Appendix D.) 27 If the insolation on a FPC is 800 Btu/ft2 /d, how large must the collector be to provide 30,000 Btu/h of heat for 1 day? Th e collector effi ciency is 40%.
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