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Traditional air-conditioner with heating and cooling functions uses the four-way valve to change the refrigerant flow direction to generate heating and cooling functions. The indoor heat exchanger is used as the evaporator at hot weather and is become as the condenser at cold weather. The thermal energy from the condenser must equal to the consumption of the work generated by compressor and the thermal energy absorbed by the evaporator. Thus, in order to match the energy balance, the surface area of condenser is approximately 1.2~1.3 times of that of evaporator. The products used for such as Taiwan''s tropical climate, air-conditioner is focused on the cooling function design; the outdoor heat exchanger must be greater than the indoor heat exchanger, so its cooling function is with expected high-performance when it is applied at hot days, but not for its heating function. On the contrary, the products used for colder regions, air-conditioner is focused on the heating function design; the indoor heat exchanger must be greater than the outdoor heat exchanger, so its heating function used at cold days is with expected high-performance, but not for its cooling function. The above products are also easier fault due to its design. The present study is to fabricate a “variable-damper multi-function heat pump air conditioner”. The internal region of its outer box is divided into the upper and lower spaces, the swing upper and lower doors are set inside to change the wind directions, separately. And there are air outlets and air inlets located to the upper and lower spaces, individually. Meanwhile, the evaporator and condenser, belonging to refrigeration system, are set on both sides the lower space. Accordingly, through the control the proper operations of refrigeration system and fans, as well as under the transforming combination of the swing upper and lower doors, it can obtain the better heating and cooling performances compared with four-way valve type air-conditioner and without its shortcomings. At the same time, the extra functions can be obtained; such as, the fast outdoor air ventilation with cooling卅heating function; the compressor is switched off and only operating the fans to introduce proper-temperature outside air for energy-saving air-conditioning; heating function is operated with dehumidification in cold-wet sessions.
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