To predict the annual performance of the HP-PV/T system, a
numerical simulation program written in C++ language has been
developed. Figs. 8a and b, respectively show the flow charts of
the computation process for the HP-PV/T systems with and without
auxiliary heating equipment. Fig. 9 shows the flow chart of
the computation process of the collector model. In the present simulation,
the HP-PV/T systems operate to collect the solar energy
only from 8:00 to 16:30 (solar time). For the system with auxiliary
heating equipment, if the water is heated to the available temperature
at the end time of 16:30, it will be supplied to the user.
Otherwise, the water will be sequentially heated to the available
temperature using an auxiliary heater before being supplied to
the user. The total daily auxiliary energy required for the hot water
is calculated by