Application and professional knowledge of semi closed compressors in cold storage2

3、 Core advantages of semi enclosed compressor cold storage application

Compared to fully enclosed and open compressors, semi enclosed models are perfectly adapted to the pain points of cold storage conditions and have become the mainstream in the cold chain industry

1. Strong maintainability and low operation and maintenance costs: Different from the shortcomings of fully enclosed compressors that result in complete machine failure, semi enclosed models have detachable shells, and components such as cylinder bodies, valve plates, crankshafts, motors, etc. can be repaired and replaced separately, greatly reducing the cost of replacing cold storage equipment and suitable for long-term operation of commercial cold storage.

2. Excellent sealing performance and high refrigeration efficiency: The motor and compression chamber are designed with integrated sealing to prevent shaft seal leakage and intake impurities in the open compressor. The refrigerant loss is low, the refrigeration cycle is stable, and the energy efficiency ratio can reach 3.0 or above, with outstanding energy-saving effects.

3. Wide adaptability to working conditions: The refrigeration capacity covers a comprehensive range, and can meet the needs of large industrial cold storage through single machine adaptation to small cold storage and multi machine parallel connection. It is also compatible with various commonly used cold storage refrigerants such as R22, R134a, ammonia, etc.

4. Strong operational stability: With strong resistance to high temperatures and load fluctuations, it can adapt to complex working conditions such as temperature differences between day and night in cold storage, incoming heating, and continuous cooling. It supports uninterrupted and continuous operation throughout the year, ensuring constant temperature inside the warehouse and reducing the loss of food and medicine.

5. Flexible installation: Compact structure, can integrate air-cooled and water-cooled condensing units, suitable for various installation environments such as indoor computer rooms and outdoor rooftops, and adaptable to various cold storage site layouts.

4、 Accurate application scenarios for different types of cold storage

1. Freshness preservation cold storage (0 ℃~5 ℃): Priority is given to using medium and small power semi enclosed piston compressors, which are suitable for fruit, vegetable, flower, and fresh meat preservation scenarios. The temperature control is precise, the start stop is flexible, and the low load operation is energy-saving, avoiding food freezing and spoilage.

2. Refrigerated cold storage (-10 ℃~-20 ℃): Equipped with a medium to high-power semi enclosed piston unit, it is suitable for the refrigeration of frozen ingredients, dry goods, and grain and oil. The refrigeration speed is fast, which can quickly offset the temperature fluctuations caused by opening the door for pickup.

3. Low temperature freezer (-25 ℃~-35 ℃): Semi enclosed screw compressors or large displacement low-temperature piston units are selected, with high pressure ratio and forced cooling capacity, to meet the deep freezing storage needs of seafood and frozen products, with minimal temperature fluctuations in the freezer.

4. Pharmaceutical/Special Cold Storage: Equipped with high stability semi enclosed units and precise temperature control systems, it operates without severe fluctuations and meets industry standards for cool and constant temperature storage of pharmaceuticals.

5、 Core Points for Cold Storage Engineering Selection

1. Matching power and cooling capacity: 3-10HP piston type units are selected for small cold storage (within 100 square meters); Medium sized cold storage (100-500 square meters) uses 10-30HP units; Priority should be given to parallel connection of screw type multiple machines in large industrial cold storage to avoid equipment overload and energy consumption surge caused by small horses pulling large trucks.

2. Refrigerant adaptation: Conventional fresh-keeping refrigerators are compatible with R134a environmentally friendly refrigerant; Low temperature freezer compatible with R22 refrigerant; Large industrial cold storage can be adapted to ammonia refrigeration models, strictly matching the unit design medium.

3. Cooling method selection: Cold storage with good ventilation and open space should use air-cooled units, which are easy to install and do not require a water circulation system; High temperature environment and large cold storage use water-cooled units, which have higher heat dissipation efficiency and more stable operation.

4. Brand and energy efficiency screening: Priority should be given to first tier brands such as Bitzer, Gulun, and Lefikang, with low equipment failure rates and universal accessories; Commercial cold storage should prioritize models with an energy efficiency ratio of ≥ 3.0 to reduce long-term operating electricity costs