If solar energy Qr is available at a reservoir storage temperature of Tr and if quantity of heat Qa is transferred by the solar collector at temperature Ta, then which of the following is true?

Question

Quizplus · Accepted Answer

All the statements are true regarding the efficiencies of solar collectors. The first law efficiency is indeed the ratio of the heat transferred by the solar collector (Qa) to the solar energy available (Qr). The second law efficiency is defined as the ratio of exergy output to exergy input, which accounts for the quality of energy being transferred. The formula given for the second law efficiency in terms of the first law efficiency and temperatures is a way to relate these efficiencies considering the ambient temperature (To) and the temperatures at which the heat is absorbed (Ta) and available (Tr).

If Solar Energy Qr Is Available at a Reservoir Storage