Abstract: The present invention provides an air-condition heat pump system and two-stage defrosting control method for continuous operation under an environment temperature range from 20 degree to negative 40 degree Celsius or lower. The heat pump system employs different defrosting methods under different temperature and humidity conditions. A ventilation and humidity control system is also provided for implementing the cross defrosting heat pump system within an indoor dimension.

Abstract: An 8-stroke cycle rotary engine utilizes a pair of master combustion chamber and slave combustion chamber to increase the fuel-efficiency. 8-stroke cycle includes mater intake stroke, slave intake stroke, master compression stroke, slave compression stroke, master expansion stroke, slave expansion stroke, master-to-slave exhaust stroke, and slave exhaust stroke.

Abstract: The present invention provides an air-condition heat pump capable of defrosting and air-conditioning at same time. The present invention utilizes at least two evaporators, which harvest the energy from one working evaporator to provide energy for defrost operation of another evaporator, thus the air-condition heat pump can defrost without additional energy. Under low temperature working condition, the present invention utilizes a suction pressure boost to increase efficiency.