Cold water is used as energy sources obtained water are circulated used in the open and close processes in these systems. The freezing point can be decreased until - 20 degree by using mono ethylene glycol so theoretically, these system can be installed at this values. However, mechanic systems are not efficient below - 10 degrees. Moreover, because of these low temperatures, the mechanic systems have the some other problems aswell. These two reason, water is not recommended to use as refrigerant liquid. It can be seen that the systems are used around -10 degree by using ammonia or the other special solutions. They have the alternative such as absorption systems like Mechanical or chemical compressor systems.
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