Solar Combi-System a New Solution for space Heating in Buildings

In the present study, the thermal load of a residential in two sample cities, Karadj and Hamedan. Then,the suitable solar combi-system and the underfloor heating system are designed for the units of the buildings. Furthermore, in response to the building energy demand ans also by studying the expense-efficiency diagram, the efficiency of solar combi-system and the number of flat-plate solar collectors are determined. In continue, regarding the effect of the shade of the collector rows and the restriction of the roof space, a hybrid system is suggested. Finally, the annual energy saving in the fuel consumption and reduction in social are studied and the payback period id determined.