Method for controlling constant temperature in frigerating chamber

Abstract

Using built performance database of cold storage room, and further based on change of ambient environment, the method calculates out temperature change influenced by change of ambient environment, and delay time of change so as to correct temperature of the cold storage room precisely. The invention controls thermostatic temperature of the cold storage room under changing ambient 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] Please refer to "Figure 1", which is a general refrigerator test and performance curve, which is implemented according to the CNS 2062 standard. On the surface, except for t...

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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 an almost constant temperature. Instead, it will change with the climate. As the ambient temperature changes, the freezing and refrigerating temperatures will also fluctuate. Please refer to "Figure 2". The refrigeration temperature will drop to the freezing point and cause 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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