Control method for loading and load shedding of optimized module machine system

Abstract

The invention relates to a control method for loading and load shedding of an optimized module machine system. The method comprises the steps that 1 superheated temperature ranges of different water temperature are set; 2 corresponding compressor movement judgment periods and the rate of change when a compressor conducts a loading movement and a load shedding movement are set according to the superheated temperature ranges of the different water temperature; when a machine group starts to operate, current total water inlet temperature is detected, and an actual rate of change of the water temperature is calculated; 4 the movement of one or more compressors is determined; 5 a next operating cycle is entered, and the movement moves in circles. According to the control method, the rapid water temperature rising and dropping are achieved, a target set value is obtained, the fluctuation of the water temperature in the operation process is small, the change of a user side load can be matched quickly, and the requirements of the comfort for a user and the manufacturability are met.

Description

technical field [0001] The invention relates to an operation control method of unit modules of a modular machine system, in particular to an optimized loading and unloading control method, specifically an optimized loading and unloading control method of a modular machine system. Background technique [0002] Modular chiller systems are widely used in commercial and industrial air conditioning systems, hereinafter referred to as modular chillers. The modular machine can be divided into air-cooled modular machine and water-cooled modular machine according to the heat exchange mode of its cooling side, but each module of the modular machine system is the same as the traditional chiller, and its ultimate purpose is to pass the refrigerant water and the modular machine The heat exchanger on the refrigerant side exchanges heat to provide users with low-temperature cold water or high-temperature hot water at a set temperature. Usually, the modular machine system adopts a modular ...

AI Technical Summary

Problems solved by technology

This conventional control method cannot respond quickly to changes in the heat load on the use side. In the technical occasion where a large air-conditioning box is installed at the end of the air conditioner, the heat load at the end is large, resulting in large fluctuations in water temperature.

[0005] Secondly, when a fixed cycle is used between the loading and unloading of every two compressor systems in the modular unit system, if the cycle is selected to be longer, the water temperature in the water system will be higher when the water system is started in summer, and the heat load required by the user will be larger. The requirement of quickly lowering the water temperature to reduce the ambient temperature on the use side cannot be met; if the cycle is selected to be very short, the water temperature will drop rapidly when the demand load on the use side is low, and it will reach the low water temperature protection value of the unit itself, causing the unit to Failure, or frequent start and stop of multi-compressor systems, etc.

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