Excessive consumption of fossil energy has triggered a serious of environmental problems,so using renewable energy brooks shouldn’t delay.Solar energy is an ideal source,which is extremely useful;the flat solar air heat collector is a device that converts a dispersible ...MORE Excessive consumption of fossil energy has triggered a serious of environmental problems,so using renewable energy brooks shouldn’t delay.Solar energy is an ideal source,which is extremely useful;the flat solar air heat collector is a device that converts a dispersible ...