Abstract: A sleeping environment control system and method includes sensing a condition of environment to obtain a value of an environmental condition parameter, and then generating a value of a thermal sensation indicator according to the value of the environmental condition parameter. A physiological status of a user is sensed to obtain a value of a physiological status parameter. After a plurality of values of the thermal sensation indicator and a plurality of values of the physiological status parameter are collected, a regression analysis is performed to obtain a best value of the thermal sensation indicator according to the plurality of values of the thermal sensation indicator and the plurality of values of the physiological status parameter. A value of an environmental condition setting parameter is adjusted according to the best value of the thermal sensation indicator.

Abstract: A heat exchange circulation system includes a first and a second heat exchangers, an expansion device, and a compressor. There is a first flow path in the first heat exchanger and a second flow path in the second heat exchanger. The expansion pipe of the expansion device is connected to the second gas outlet of the second flow path and the first gas inlet of the first flow path. The compression pipe of the compressor is connected the first gas outlet of the first flow path and the second gas inlet of the second flow path. The first flow path, the compression pipe, the second flow path and the expansion pipe together form a heat exchange circuit. The liquid exists in the first flow path and the second flow path and the gas mixture circulates in the heat exchange circuit.

Abstract: A heat exchange circulation system includes a first and a second heat exchangers, an expansion device, and a compressor. There is a first flow path in the first heat exchanger and a second flow path in the second heat exchanger. The expansion pipe of the expansion device is connected to the second gas outlet of the second flow path and the first gas inlet of the first flow path. The compression pipe of the compressor is connected the first gas outlet of the first flow path and the second gas inlet of the second flow path. The first flow path, the compression pipe, the second flow path and the expansion pipe together form a heat exchange circuit. The liquid exists in the first flow path and the second flow path and the gas mixture circulates in the heat exchange circuit.