本論文為得出室內溫度與壓縮機轉速之關係，並得出空調機之最佳控制策略。由蒸發器及室內環境的能量平衡，和壓縮機轉速與冷媒流量關係，得知室內溫度與壓縮機轉速之關係為二階的轉移函數。 現行空調機的控制策略分為三部分，第一為壓縮機的啟動策略，其次為在不同室外溫度下，溫差所對應的初始轉速命令，第三為壓縮機轉速隨室內溫度之變化。此外，在室內溫低於設定溫約2 oC時，壓縮機停機，等到室內溫與設定溫約相同時，壓縮機再次啟動。為得出小型變頻空調機之最佳降溫曲線，本論文利用不同工作條件下進行運轉測試，得出室內溫度與壓縮機轉速之轉移函數之係數，改寫成壓縮機轉速為室內溫度的函數，測試運轉於現行空調機。; In this thesis, the relationship between indoor temperature and the compressor speed is obtained by the conservation principles of energy in the evaporator, the mass flow of refrigerant, and the indoor dynamics. An second-order model structure with indoor temperature and compressor speed is setup. There are three stage of the original controller in the air condition. The compressor speed of the first stage is opening. The compressor speed of the second stage is decided on the difference of setting temperature and indoor temperature. The compressor speed of the third stage is changed with the change of the indoor temperature. In order to achieve greater improvement over conventional schemes, to control a vapor compression cycle over a wide range compressor speed and others characteristics. Then find out the factors of second-order model structure with indoor temperature and compressor speed. The compressor speed is adapted to the function of indoor temperature, and then tested with the air-conditioner.