Housing was originally devised as a control of the thermal environment, but numerous other functions have been added with resulting competition and confusion. Current design gives insufficient attention to thermal factors and relies upon supplementary heating and cooling to compensate for faults. These are wasteful of energy, and the exhaust from air conditioners adds to the heat island conditi...

In Japan, room air conditioners, mainly heat-pump type, have been widely introduced into households. And "one unit to one room" really features today rather than "one unit to one home" in the past. In the circumstances where room-by-room air conditioning or all-season air conditioning systems are increasing, reduction of electric power consumption strongly required. As a consequence, the effici...

This paper demonstrates the possibility of achieving a higher Energy Efficiency Ratio (EER) for Room Air Conditioners (RACs) that complies with the Saudi energy efficiency standards and satisfies the energy conservation requirements for the Saudi Building Code (SBC). This study considers several design options for improving the performance and efficiency of the RAC in comparison with a baseline...