Control method of two-stage compression water chiller unit and air conditioning system

By collecting compressor operating parameters and calculating the target opening of the secondary throttling valve, active and precise control of the throttling valve is achieved, solving the problem of inaccurate control of throttling devices in existing technologies, improving the operational stability and applicability of the unit, and reducing costs.

CN122191817APending Publication Date: 2026-06-12NANJING TICA AIR CONDITIONING CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING TICA AIR CONDITIONING CO LTD
Filing Date
2026-03-04
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

The throttling devices of existing two-stage compression chiller units are not precise enough, resulting in unstable operation and abnormalities such as low pressure and liquid carryover during air intake, which increases the cost and complexity of the unit.

Method used

By collecting the compressor's operating parameters and using a preset algorithm to calculate the target opening of the secondary throttle valve, active and precise control of the throttle valve is achieved, eliminating the dependence on the level gauge and using an electric expansion valve as the throttle mechanism.

Benefits of technology

It improves the reliability of control and the adaptability of the unit to different operating conditions, reduces the cost and complexity of the air conditioning system, avoids measurement delays and failures of the level gauge, and ensures that the unit can operate efficiently and stably under a wider range of operating conditions.

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Abstract

The application discloses a control method of a two-stage compression cold water unit and an air conditioning system. The unit comprises a compressor, a condenser, an economizer evaporator connected in series, a first throttling valve arranged between the condenser and the economizer, and a second throttling valve arranged between the economizer and the evaporator, wherein the second throttling valve is an electric expansion valve. The control method comprises the following steps: collecting operation parameters of the unit, wherein the operation parameters at least include an operation rotating speed of the compressor, an opening degree of a suction guide vane, suction pressure, intermediate pressure and discharge pressure; calculating a target opening degree of the second throttling valve through a preset algorithm based on the operation parameters; and controlling the second throttling valve to adjust to the target opening degree. The control method directly calculates the opening degree of the throttling valve based on the operation parameters, thereby breaking the dependence on a liquid level meter, reducing the cost of the air conditioning system, and significantly improving the reliability of the control and the working condition adaptability of the unit.
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