Control method of air conditioning unit and air conditioning unit

By combining air conditioning unit zonal control and multi-stage heat exchangers, the problem of inaccurate temperature and humidity control in the heat pump dehumidification air conditioning system for LNG cargo tanks was solved, achieving precise adjustment and stability of temperature and humidity inside the tank, avoiding condensation, and improving the system's automation level.

CN119284130BActive Publication Date: 2026-06-23GREE ELECTRIC APPLIANCE INC OF ZHUHAI
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Patent Information

Application Number
CN202411618751.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-13
Publication Date
2026-06-23
Estimated Expiration
2044-11-13

AI Technical Summary

Technical Problem

The existing heat pump dehumidification air conditioning system for LNG ship cargo tanks has a low degree of automation in terms of cooling and heating, and cannot achieve precise constant temperature and humidity regulation inside the tank, resulting in uneven temperature and humidity and condensation.

Method used

The air conditioning unit adopts a zoned control method, dividing the cabin into multiple zones, with each zone connected to at least one air outlet. The target temperature and humidity of other zones are adjusted based on the central zone, and precise temperature and humidity control is achieved by adjusting the opening of the air outlet valves and the compressor frequency. This is combined with the use of a rotary dehumidifier, a functional heat exchanger, and a heat recovery heat exchanger.

Benefits of technology

It achieves precise control of temperature and humidity inside the cabin, reduces temperature and humidity fluctuations, avoids condensation, and improves the system's automation level and temperature and humidity control efficiency.

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Abstract

The application provides a control method of an air conditioning unit and the air conditioning unit. The air conditioning unit has multiple air outlets. A cabin is divided into multiple areas from top to bottom. Each area is connected with at least one air outlet. The control method comprises the following steps: when the temperature or humidity of the cabin does not meet the use requirement, the target temperature or target humidity of the middle area of the cabin is adjusted, and the target temperature or target humidity of other areas is set by compensation based on the target temperature or target humidity of the middle area; and the air valve opening degree of each area is controlled so that the temperature detected by each area is close to or equal to the target temperature. The cabin is divided into multiple areas, and air supply control is performed on each area, so that the temperature control in the cabin is more accurate. The temperature on the air outlet side of the condenser and the humidity on the air outlet side of the evaporator are corrected, and the temperature and humidity control efficiency of the unit is improved.
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