5Cervantes J G, Torres R E. Experiments on a solar - assis- ted heat pump and an exergy analysis of the system [ J ]. Applied Thermal Engineering,2002,22 : 1289 - 1297.
6Aye L Charters W W,Chaichana C. Solar heat pump sys- tems for domestic hot water E J ]. Solar Energy, 2002,73 (3) :169 -175.