Control method of ultra-low humidity compound dehumidifier

Abstract

The invention relates to a control method of an ultra-low humidity compound dehumidifier, which comprises the following steps: 1, measuring an inlet air temperature of a first fan through a temperature sensor, controlling the start and stop of a primary refrigeration dehumidification system according to the inlet air temperature, if higher than a set value, starting a first compressor, if lower than the set value, stopping the first compressor; 2, a first temperature and humidity sensor sensing an outlet air dew point of a second air cooling evaporator according to the inlet air temperature and controlling output of a secondary refrigeration dehumidification system, loading a second compressor if the dew point is higher than the set value, deloading the second compressor if the dew point temperature is lower than the set value, keeping the second compressor to stably output if the dew point temperature is equal to the set value, the secondary temperature and humidity sensor sensing the air outlet dew point at a third air cooling compressor humidity of a third air cooling compressor and controlling output of the third cooling and dehumidification system according to the inlet air humidity system, loading the third compressor stable output if the dew temperature is equal to the set value.

Description

technical field [0001] The invention relates to a dehumidifier, in particular to an ultra-low humidity composite dehumidifier and a control method thereof. Background technique [0002] Existing refrigerated dehumidifiers, when the evaporation temperature of the refrigerant is higher than 0°C and lower than the dew point temperature, the dehumidification effect is good and the performance is stable, but for the air treatment process requiring low humidity, the temperature of the outer surface of the evaporation coil is usually lower than Below 0°C, the evaporating coil is prone to frost, the dehumidification capacity will decrease, the energy consumption will increase, and it will even fail to work normally. For example, Chinese Patent Document No. CN1410720 disclosed a dehumidifier on April 16, 2003. In this dehumidifier, the refrigerant is compressed by the compressor, and the refrigerant is supplied to the evaporator by the condenser. The air sucked into the main casing ...

AI Technical Summary

Problems solved by technology

[0004] In the existing combined dehumidifier, the regeneration air directly utilizes the outdoor fresh air, and the regeneration exhaust air is exhausted to the outside, and the control accuracy of temperature and humidity is low, and energy recovery and utilization are not considered

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