Frostless air handling unit and proportion-integration-differential control method thereof

Abstract

The invention discloses a frostless air handling unit and a proportion-integration-differential control method of the frostless air handling unit. The frostless air handling unit comprises a circulating working return circuit and a controllable silicon power adjuster, wherein the circulating working return circuit is composed of a compressor assembly, a condenser, an electronic expansion valve and an evaporator assembly, the compressor assembly, the condenser, the electronic expansion valve and the evaporator assembly are sequentially connected along the refrigerating fluid flowing direction. When a calculation controller receives an outdoor temperature parameter transmitted by a temperature-humidity sensor and the temperature parameter is lower than 0 DEG C, the calculation controller carries out calculation according to received air temperature and humidity parameters, an air pressure parameter and an evaporator surface temperature parameter, controls the opening degree of the electronic expansion valve according to the calculation results, and adjusts evaporator surface temperature through increase or reduction of the opening degree of the electronic expansion valve. Meanwhile, the controllable silicon power adjuster judges an air suction superheat degree of a compressor through received compressor air suction temperature and air suction pressure, adjusts increase or reduction of electric heater power, and maintains the air suction superheat degree of the compressor to be kept in a preset value range. According to the frostless air handling unit and the proportion-integration- differential control method of the frostless air handling unit, the aim of maintaining safe and high-efficiency operation of the system is achieved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and relates to a frost-free air handling unit and a proportional-integral-differential control method thereof. Background technique [0002] The enthalpy difference method refrigeration and air conditioning performance test device often requires an air handling unit to control the temperature and humidity of the test environment to meet the operating conditions of the tested unit. For example, when the air-cooled cold air unit type air conditioner is subjected to the nominal cooling performance test, the dry and wet bulb temperature between the outdoor test environment should be controlled at 35°C / 24°C, while the dry and wet bulb temperature between the indoor test environment should be controlled at 27°C / 19°C, the dry and wet bulb temperature control between the outdoor and indoor test environments is realized through the air handling unit. [0003] According to the functional section,...

AI Technical Summary

Problems solved by technology

[0007] Technical problem: In view of the defects of low operating efficiency of existing air handling units, frost formation in high-humidity conditions such as defrosting of the tested unit, and short system life, the present invention provides a high operating efficiency, accurate monitoring and control, and low temperature and high humidity. It can operate continuously in an environment, and the power of the electric heater can be adjusted according to the outdoor weather conditions to reduce energy consumption. It can ensure the safe operation of the compressor. The frost-free air handling unit with long system life also provides a proportional-integral - Differential control method

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