Method and device of refrigeration control and variable-frequency air conditioner

Abstract

The invention discloses a method and device of refrigeration control and a variable-frequency air conditioner. The method comprises the following steps that in the refrigeration operating process, the indoor temperature is detected, the indoor temperature difference is calculated, and indoor temperature PID operation is conducted according to the indoor temperature difference, so that a first target frequency is obtained; the indoor temperature is compared with a set comfortable temperature; if the indoor temperature is not lower than the comfortable temperature, a compressor is controlled according to the first target frequency; if the indoor temperature is lower than the comfortable temperature, the coil pipe temperature of an evaporator of the variable-frequency air conditioner is detected, the temperature difference between the coil pipe temperature and a coil pipe target temperature is calculated, the coil pipe temperature difference is obtained, and coil pipe temperature PID operation is conducted according to the coil pipe temperature difference, so that a second target frequency is obtained; the compressor is controlled according the smaller one of the first target frequency and the second target frequency; and the coil pipe target temperature is determined according to the indoor target temperature, and when the indoor target temperature is low, the target coil pipe temperature is low. By adoption of the method and device of refrigeration control and the variable-frequency air conditioner, more reasonable and comfortable control can be achieved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a refrigeration control method, device and frequency conversion air conditioner. Background technique [0002] In the hot summer, many people cannot do without the air conditioner all day and all night. However, blowing air conditioners for a long time has many harms to the human body, and it is easy to get air conditioner diseases. [0003] In order to solve the uncomfortable problem caused by cold air blown out by refrigeration, the control method of controlling the operating frequency of the compressor can be based on the coil temperature of the indoor heat exchanger as the control target. In the existing coil temperature control process, the target temperature of the coil adopts a fixed value, which is generally a fixed temperature value solidified in the storage of the air conditioner. In actual use, there is often a phenomenon: when the indoor target ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for refrigeration control, which can achieve more reasonable and comfortable control while solving the problem of uncomfortable refrigeration caused by the cold air blown out by the existing inverter air conditioner

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