Research is also being carried out into the possibility of using solar energy to power refrigeration machines. This is important for developing countries. In the medical world refrigeration is also used for hypothermic, cryogenic surgery and the storage of blood, tissue and organs. Within the process industry there are many problems that can be solved by using low temperatures. Most processes are only made possible by using refrigeration and often this makes these processes more economical and environmentally acceptable.
Process industry uses the condensation method to extract harmful chemicals from factory waste.
Silt waste from drinking water and sewage treatment plant is made more mana geable by first freezing and then thawing. Laboratory research is carried out into both these systems. These are the two main areas of research which are the most closely connected with the requirements of the industry. A great amount of expertise is build up in the area of motive power from solar energy sources. There are many possibilities in this field for engineers who feel at home here.