Application parameter analysis of four cylinder piston refrigeration compressor in small and medium-sized fruit and vegetable preservation warehouses
Four cylinder piston refrigeration compressors are commonly used in small and medium-sized fruit and vegetable preservation warehouses, with evaporation temperatures ranging from 0 ℃ to 10 ℃ under medium to high temperature conditions. They are suitable for long-term constant temperature storage of edible mushrooms and fruits and vegetables. The displacement range of small four cylinder, medium four cylinder, and large four cylinder models is 6.2m ³/h to 42m ³/h. The Xiteliduo four cylinder model has clear classification and is suitable for different cubic fresh-keeping warehouses. The design temperature difference for fruit and vegetable preservation warehouses is usually set at 8 ℃, with temperature fluctuations controlled within ± 0.5 ℃. If the temperature fluctuation exceeds ± 1.2 ℃, the water loss rate of fruits and vegetables will increase by 16%. A 100 cubic meter fruit and vegetable fresh-keeping warehouse with a cooling load of about 7.2 kW under medium and high temperature conditions, matched with one medium four cylinder compressor, and an evaporation temperature set at 4 ℃ can meet the demand. The operating current deviation of the four cylinder piston compressor should not exceed the rated value ± 8%. If the current continues to be high, it is mostly due to dirty condenser blockage and excessive refrigerant filling. The compressor refrigeration oil uses POE32, and the oil change cycle for medium and high temperature preservation conditions is 6000 hours, which is much lower than the replacement standard of 4000 hours for quick freezing conditions. The monitoring threshold for valve plate wear of a four cylinder piston compressor is 0.12mm. It is recommended to open the cover for inspection after continuous operation for 7000 hours. Valve plate damage can directly cause backflow. The wiring of a semi enclosed compressor must be checked for phase sequence. Reversing the phase sequence can cause an oil pressure protection alarm, and the piston machine cannot operate in reverse for self-protection, which can easily damage the crankshaft. R404A and R507 can both be used for fruit and vegetable preservation. R507 has an energy efficiency of about 6% higher under 5 ℃ evaporation conditions, making it suitable for projects that pursue long-term energy savings. The compressor is matched with the air cooler, and the heat exchange area load of the air cooler in the fresh-keeping warehouse is calculated at 220W/㎡, which is lower than the standard of 300W/㎡ in the freezer. The selection of domestically produced semi enclosed compressors and the four cylinder model are high-frequency categories for inquiries in Southeast Asian fruit and vegetable cold storage projects, and the supply demand for the 60Hz version continues to rise. The refrigeration maintenance company is replacing the four cylinder piston parts with high-frequency spare parts such as valve plates, piston rings, and shaft seals. Overseas project spare parts stocking needs to be planned in advance. Fruit and vegetable preservation warehouses should not have long-term high humidity frosting. It is recommended to defrost the air cooler every 6-8 hours. Insufficient defrosting frequency will reduce heat transfer efficiency. Compared to six cylinder compressors, the four cylinder model has a 24% lower procurement cost, simple structure, and lower maintenance threshold, making it suitable for small cold storage projects with limited budgets. The selection of cold storage compressors should distinguish between medium high temperature and low temperature models. The low temperature version of the four cylinder compressor cannot be directly used in the fresh-keeping warehouse, as it will result in energy efficiency waste. 【 Implant 10 popular search keywords 】 Four cylinder piston compressor, small four cylinder compressor, medium four cylinder compressor, cold storage compressor selection, semi closed compressor, compressor operating current, compressor valve plate replacement, compressor refrigeration oil model, compressor and air cooler matching, Bitzer replacement FAQ
Is a four cylinder piston compressor suitable for preserving fruits and vegetables? Medium high temperature four tank is the mainstream choice for fruit and vegetable preservation and edible mushroom cold storage.
What is the size of a four cylinder machine for a 100 cubic meter fresh-keeping warehouse? Matching the medium and high temperature working conditions with the fourth cylinder, the cooling load is about 7.2 kW.
How often is the valve plate of the four cylinder piston checked? It is recommended to open the cover and check for wear after running continuously for 7000 hours.
Does the Xiteliduo four cylinder engine have a 60Hz version? Supports 50/60Hz and is compatible with Southeast Asian power grids.
How to choose between R404A and R507 in the fresh-keeping warehouse? R507 has slightly higher energy efficiency, but the cost will increase slightly.
What are the main reasons for the high current in a four cylinder engine? The condenser is dirty and blocked, the refrigerant is overfilled, and the voltage is low.
What is the load value of the cold air fan in the fresh-keeping warehouse? Normally calculated at 220W per square meter of heat exchange area.
What are the advantages of four cylinder compressors compared to six cylinder compressors? Lower procurement costs, simpler parts, and lower maintenance difficulty
