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The refrigeration equipment calculation in the walk-in cooler
The refrigeration equipment calculation in the walk-in cooler
The temperature of the food that needs to be frozen before entering the walk-in cooler is higher than the temperature in the walk-in cooler, and the food is in the process of processing The moisture in it will freeze. Therefore, the specific enthalpy difference of the food before and after processing can be used to calculate the calorific value of the food during the freezing process. For refrigerated walk-in cooler, we think that the food has been frozen before entering the walk-in cooler, but the temperature at which the food enters the refrigerated walk-in cooler is different from the walk-in cooler temperature, so there is still a part of the food that needs to be heated in the walk-in cooler. It is released in the cooler, and the frozen food is affected by the environment during transportation, and the temperature of the food may exceed the refrigeration temperature to cause recooling heat.
Selection and design of refrigeration equipment walk-in cooler The selection calculation of refrigeration system machinery and equipment includes refrigeration compressors, condensers, cooling equipment, expansion valves and necessary auxiliary equipment (intercoolers, high-pressure reservoirs, oil and ammonia separation Calculation of the model selection of air-conditioning equipment, gas-liquid separator, low-pressure circulation barrel, etc.).
compressor selection
1. The main parameters of piston compressor selection calculation The basic idea of selecting piston compressors is to first calculate the relevant compressor performance parameters, and then go to the manufacturer to select the appropriate model of products based on these parameters. The manufacturer generally provides the basic parameter table of the compressor; in addition, the manufacturer also provides the performance curve diagram of the compressor prototype under the nominal working condition.
2. The selection of the piston refrigeration compressor form determines the selection of single and two-stage compressors based on the compression ratio pk/p. . For the ammonia system, pk/po≤ single-stage at 8 and dual-stage for pklpo>8; for freon systems, pk/po≤ single-stage at 10 and dual-stage for pk/po>10. The two-stage compressor used can be a single two-stage compressor, or a matched two-stage compressor.
3. The single capacity and number of refrigeration compressors should be determined according to factors such as facilitating energy adjustment and adapting to changes in the operating conditions of the walk-in cooler refrigeration object. When multiple compressors are used, products of the same series or model should be used as much as possible to facilitate operation and maintenance.
4. The working range of the refrigeration compressor and the operating conditions of the automatic control compressor should meet the aforementioned basic conditions as much as possible. On the premise of ensuring operational safety protection, other control contents can be added during system design. With the continuous advancement of refrigeration automatic control technology, the use of a refrigeration compressor with microcomputer control is an ideal choice, but this choice must be coordinated with the entire refrigeration system control program.
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