The world energy issue is essential because the current demand for energy in various fields has been increasing steadily and rapidly. One of the most energy usages are refrigeration and air conditioning applications. Therefore, it would be useful to reduce the energy usage by, for example, efficiency improvement and ejector adaptation in the refrigeration system. An ejector is an inexpensive device that can utilize even free sources of energy like solar collector or industrial waste heat. It can replace or combine with a mechanical compressor in the refrigeration system, which is less dependent on electricity.