Method for controlling constant temperature in frigerating chamber

Abstract

A method for constant temperature control of a refrigerating room, which uses the establishment of a refrigerating room performance database, and then calculates the temperature change and the delay time of the change affected by the refrigerating room according to changes in the surrounding environment, and accurately corrects the temperature of the refrigerating room. And then reach the constant temperature control of the refrigerator compartment temperature under the changing environment.

Description

technical field [0001] The invention relates to a method for constant temperature control, which is applied to a refrigerator, especially a method for constant temperature control of a refrigerator under ambient temperature changes. Background technique [0002] The basic principle of the freezing and refrigeration system is to use compressors, evaporators, condensers, expansion valves and other equipment to connect with each other with pipelines, and use the compressor to run, push the refrigerant inside the pipelines at high temperature and high pressure, and then pass through the condenser, expand The valve becomes a low-temperature state, and when it passes through the evaporator, it can provide cold energy, and finally returns to the compressor for compression to form a refrigeration cycle. [0003] See " figure 1 ", is for the general refrigerator test and performance curve, which is implemented according to the CNS2062 standard. On the surface, except for the problem...

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Problems solved by technology

However, the fact is not the case. Because this standard is adopted, the ambient temperature of the refrigerator is set at 30±1°C, so the experimental data shows that it is quite stable and can maintain a constant temperature. However, in actual use, the temperature of the surrounding environment cannot be maintained at a nearly constant temperature. Rather, it varies with climate, and freezing and refrigerating temperatures fluctuate as the ambient temperature changes, see " figure 2 ", when the ambient temperature drops to a certain temperature (cold winter season), it greatly deviates from the original set refrigeration temperature, causing the refrigeration temperature to drop to freezing point and causing frostbite of fruits and vegetables

[0004] Generally speaking, the best refrigerated environment for food is 3°C, 90% RH, and vegetables and fruits are more sensitive. Once the temperature changes too much, the fruits and vegetables will often be frostbitten. It greatly reduces its appearance, causing some wholesalers, stores, etc. to be slow-moving or unattended, and relatively increasing its cost burden

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