Carry out the preliminary thermal design of a vaporcompression cycle heat pump that uses a solar collector as the heat source.
Use Refrigerant-134a as the working fluid, and assume an average solar flux of 496 Btu per square foot per day in December (the worst case) with a yearly average solar flux of 1260 Btu per square foot per day. The heat pump must provide 400. × 103 Btu per day to a house during December and average 200. × 103 Btu per day during the year. Be sure to determine the following items in your analysis:
a. The required collector surface area for worst case and average conditions. (Is either too large for an average roof?)
b. The resulting system coefficient of performance.
c. The required mass flow rate of R-134a. Note: Assume a solar flux (sunshine) period of 8 to 10 hours per day.