With theincreasing demand for refrigeration and air conditioning worldwide, theinterest in alternative processes of cold production which can be supplied fromrenewable energy sources is also growing. One promising possibility is thermalprocesses. In these processes, thermal energy is used to generate cold. Solarheat for cold production allows the vapour jet compressor from vapourjet compressor IN refrigeration to be operated with solar-generated heat fromthe domestic water heating with flat collector flat collector. Aftersufficient solar thermal heating, the heat transfer fluid from domesticwater heating with flat collector is pumped into the vapour generator of vapourjet compressor in refrigeration by the pump from solar heat for coldproduction. The pump is operated via Vapour jet compressor inrefrigeration and domestic water heating with flat collector are connectedby hoses. The energy added from solar heat is determined by two temperaturesensors and one flow rate sensor.