Nowadays precision dew point hygrometers are mostly the type of light-electricity detection,thermoelectric refrigeration and specula-surface condensation dew point instrument internationally.
Using the method of optimal efficiency and maximal quantity of refrigerating output, a thermoelectricity refrigeration system commix with compress refrigeration is designed.
Operating costs of using the steam jet refrigeration system to cool the temperature of water in air conditioning system are lower than the refrigerative compressor.