Cooling room is mainly used for frozen food processing […]
Cooling room is mainly used for frozen food processing refrigeration, which through artificial refrigeration, so that the interior to maintain a certain low temperature. Special uses determine the special construction. Cold walls, floors and top have a certain thickness of insulation, and the surface are painted light colors. Cold storage building to prevent the diffusion of water vapor and air infiltration, to prevent the foundation caused by freezing and expansion of the ground rupture and building deformation, have a strong bearing capacity and frost resistance. In general, cold storage building is its strict insulation, sealing, ruggedness and frost resistance to ensure the quality of the building.
The evaporation temperature that a single-stage compression refrigeration cycle can achieve depends on the condensing pressure and pressure ratio. Single-stage compression, such as pressure ratio increases, will reduce economic efficiency, deterioration of operating conditions. Therefore, the compression capability and economic efficiency of single-stage compression are actually limited. The application of two-stage compression, can avoid the above adverse effects, in the case of low temperature to improve operating conditions, reduce power consumption, improve economic efficiency.
Two-stage compression refrigeration cycle is characterized by the compression process is carried out in two stages, and between the high and low intercooler installed. This avoids the single-stage compression refrigeration problems encountered. However, two-stage compression system equipment to be more complex, making adjustments than the single-level more serious, higher investment costs, so as long as the single-stage can solve the problem does not require two-stage compression.
Single-stage compression refrigeration system works: It consists of refrigeration compressor, condenser, expansion valve and evaporator components, and a pipe connected to form a closed system. When the refrigerant is throttled through the expansion valve, the pressure is reduced and enters the evaporator. The low-pressure refrigerant liquid absorbs the heat of the medium around the evaporator and evaporates.