Last time, we introduce compressor and condensing unit for cold room. This time we will introduce the another two parts: throttle valve and evaporator.

3. Throttle valve

The throttle valve acts as a throttling and depressurizing valve. When the high-pressure refrigerant liquid which is condensed by the condensing unit for cold room, passing through the throttle valve, the pressure drops due to obstruction, leading to the vaporization of some refrigerant liquid. At the same time, it absorbs the latent heat of vaporization, and its temperature also decreases accordingly, becoming a low-temperature and low-pressure wet steam, which then enters the evaporator.

4. Evaporator / cold room air cooler is also a kind of heat exchanger, which makes the low-pressure and low-temperature refrigerant liquid absorb the heat of the cooling medium (air, water, saltwater or other refrigerants) in the boiling process, to achieve the purpose of refrigeration.