Emission standards have grown increasingly stricter, consequently triggering greater interest in issues surrounding environmental pollution. The customer needs for green car without toxic exhaust gas has also become natural and it is represented by pure EV (Electric Vehicle). However, the driving range of EV suffers from A/C (Air Conditioning) for occupant comfort especially in very hot or cold weather. Therefore, the sizing of A/C system is more important than the case of conventional internal combustion engine vehicle. Specifically, EV consumes electric power of battery pack in order to control the comfortability of passenger compartment due to not only the absence of engine heat rejection for interior heating, but no working power of compressor from engine for interior cooling. Therefore, energy consumption for cabin cooling/heating must be optimized for the energy efficiency of EV. In this paper, we concentrate on the refrigerating system sizing because indoor air temperature in hot weather is more sensitive to passenger's thermal comfort.

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