抄録
Simplified double grade simulation model which gives electric and thermal energy balances in a renewable electric and thermal hybrid power system by only two days (the representative clear and cloudy days) calculations and clear day ratio in the period was proposed. The renewable energy power system consists of photovoltaic-thermal hybrid solar panels and a heat pump using underground water as a heat source. The errors in various simplified models were estimated in comparison with the results of full time integration every one minute. Analysis of annual electric and thermal energy balances and amount of carbon dioxide emissions for domestic size renewable electric and thermal hybrid power systems were demonstrated using the proposed simplified simulation model. The annual running cost and carbon dioxide emission in the renewable energy power system were extremely lower (1/2 and 1/10 rectively) than those in the conventional power system. Annual system running cost strongly depends on the coefficient of heat loss of the house and the solar panel area. Improvements of the thermal gain from the hybrid solar panel in cold climate regions were achieved with the low temperature heat storage tank added in the system and with optimization of the panel connections.
