Water chiller

By using compressor suction and discharge pressure sensors in the chiller unit, combined with liquid level and outlet water temperature detection, and employing PID algorithm and segmented control of regulating and loading valves, the problems of slow response and poor stability of the chiller unit during peak load periods are solved, achieving fast, stable and efficient operation.

CN122170548APending Publication Date: 2026-06-09QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Chillers have slow response times during peak load periods, poor system regulation stability, and excessively long stabilization time, resulting in low system energy efficiency and a tendency to trigger false warnings or abnormal control.

Method used

The compressor status is detected by compressor suction and discharge pressure sensors, combined with liquid level and outlet water temperature detectors. Through PID algorithm and segmented control of the opening degree and pulse duration of regulating valve and loading valve, the evaporator outlet water temperature and refrigerant level are precisely regulated.

Benefits of technology

It improves the response speed and stability of the chiller unit when the load changes, ensures that the system quickly enters a stable state, improves energy efficiency and extends service life.

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    Figure CN122170548A_ABST
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Abstract

The application relates to a water chiller, which comprises a compressor, a heat exchanger assembly, a regulating valve and a controller, wherein the heat exchanger assembly comprises a condenser and an evaporator connected with the compressor through refrigerant pipelines; the evaporator is provided with a liquid level detection member and a water outlet temperature detector; the liquid level detection member is used for detecting the refrigerant liquid level in the evaporator; the water outlet temperature detector is used for detecting the water outlet temperature of the evaporator; the regulating valve is connected between the condenser and the evaporator; when the actual liquid level Lc detected by the liquid level detection member and a target liquid level Ls satisfy: delta L < |Lc-Ls|, the controller adjusts the opening degree of the regulating valve according to the suction and discharge pressure difference, so as to adjust the water outlet temperature of the evaporator; the refrigerant liquid level in the evaporator and the suction and discharge pressure difference can more directly reflect the water outlet temperature, and then when the load of the water chiller changes, the water outlet temperature can be adjusted and controlled in time by adjusting the opening degree of the regulating valve, and the system adjusting and controlling capacity is improved.
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