Control method of multi-unit air-conditioning system

Abstract

The invention belongs to the technical field of air conditioners, and in particular relates to a control method for a multi-unit air conditioning system. The present invention aims to solve the problems that the existing control method is difficult to reliably ensure that the actual operation demand of the water chiller after load reduction matches the operation state, and the energy efficiency ratio parameters of the chiller are not ideal. For this purpose, the control method of the multi-unit air-conditioning system of the present invention can judge the loading and unloading requirements of the current air-conditioning system based on the outlet water temperature, and can also use the outlet water temperature after loading and unloading, the average unit load or The start-up temperature difference increases and decreases the number of units of the multi-unit air-conditioning system, so as to further improve the matching degree between the operation demand and the operation capacity of the multi-unit air-conditioning system, and optimize the energy efficiency ratio parameters of the multi-unit air-conditioning system, so that the multi-unit air-conditioning system can meet the basic replacement requirements. Run efficiently while meeting thermal demands.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a control method of a multi-unit air conditioning system. Background technique [0002] In large places such as factories and shopping malls, indoor temperature control and water supply are usually performed through multiple chillers. In the case of meeting the heating / cooling demand, the overall operation of multiple chillers is usually regulated according to the actual water supply temperature. [0003] In the traditional control method, the heat exchange requirements of the chillers are usually judged according to the water supply temperature of multiple chillers. If the cooling capacity of the multiple chillers is too strong relative to the actual heat exchange demand, the operating parameters of the multiple chillers will be adjusted to achieve the purpose of reducing the load of the multiple chillers. The disadvantage of the above control method is th...

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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing control method is difficult to reliably ensure that the actual operation demand of the chiller unit after load reduction matches the operating state, and the energy efficiency ratio parameters of the chiller unit are not ideal, the present invention provides A control method for a multi-unit air-conditioning system, the control method comprising: obtaining the current outlet water temperature under cooling conditions; and reducing the load of the multi-unit air-conditioning system when the current outlet water temperature is lower than a target temperature ; Acquiring the change of the outlet water temperature and the average load of the unit in the load shedding process; selectively reducing the outlet temperature of the multi-unit air-conditioning system based on the change of the outlet water temperature and the change of the average load of the unit Number of operating units

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