Principle of matching compressor and condenser | Code for collaborative design of condensing area, air volume, and ambient temperature
The core of matching the compressor and condenser is to control the condensation temperature. The design value of the condensation temperature in a conventional cold storage is 8-12 ℃ higher than the ambient temperature, and the energy consumption of the unit increases rapidly beyond the range.
The heat exchange area of the condenser of the low-temperature refrigeration unit needs to be increased by 20% on the basis of medium and high temperature, and by 30% for quick freezing and two-stage deep freezing conditions, to offset the load increase from the low-temperature side heat exchanger.
The Xitelidou compressor condensing unit has completed matching verification before leaving the factory. Cold storage engineering companies that purchase compressors and condensers separately need to calculate the heat transfer load of the condenser based on the displacement.
The selection of fin spacing for air-cooled condensers: 4.2mm large spacing fins are used in aquatic workshops and feed factories with high dust, while 2.1mm dense fins are used in conventional clean rooms to enhance heat transfer capacity.
The condenser accumulates 0.8mm of ash, resulting in a 25% decrease in heat transfer efficiency and a 15% increase in compressor discharge pressure. The fatigue wear rate of the valve plate increases by 1.8 times over long-term operation.
In the tropical region with a high temperature environment of 42 ℃, the air volume of the condenser fan needs to be increased by 25% or the heat exchange area needs to be increased. Simply increasing the compressor horsepower cannot solve the problem of high pressure protection.
The water-cooled condenser needs to control the water quality. If the turbidity of the circulating water is higher than 15NTU, the growth rate of fouling on the pipe wall will accelerate, and every 0.2mm fouling layer will cause a heat transfer attenuation of 18%.
Many novice engineers only select condensers based on the compressor nameplate cooling capacity, ignoring refrigerant differences. The pressure requirements for R23 high-pressure refrigerant condensers are much higher than those for R404A and R507 models.
The exhaust heat flow of screw refrigeration compressors is larger, and the heat exchange area of the condenser of screw units with the same refrigeration capacity is 15% larger than that of piston models, avoiding high condensation pressure.
The power supply of the condenser for foreign trade projects needs to be confirmed, and the voltage and frequency of the fan should be consistent with that of the compressor. Southeast Asia 415V/50Hz and America 460V/60Hz cannot mix fan motors.
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FAQ
How much higher is the condensation temperature of a regular cold storage compared to the environment? The design temperature difference is generally controlled between 8-12 ℃.
2. What is the enlargement ratio of the condenser area under quick freezing conditions? Increase the heat exchange area by 30% in the deep freezing condition of quick freezing.
3. How thick is the ash accumulation on the fins, resulting in a 25% heat transfer attenuation? The accumulated ash thickness reaches 0.8mm, and the heat transfer attenuation is 25%.
What is the recommended upper limit of turbidity for water-cooled circulating water? Suggest controlling turbidity below 15NTU to reduce scaling.
How much larger is the condenser of a screw machine with the same cooling capacity than that of a piston machine? The heat exchange area needs to be enlarged by 15%.
6. What is the spacing between fins for the dust workshop? Priority should be given to 4.2mm large spacing fins to prevent dust blockage.
Is it feasible to only increase the compressor horsepower for tropical high-temperature projects? Not feasible, prioritize improving condensation capacity.
