Control method of multi-unit air conditioning system

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a control method of a multi-unit air conditioning system. The invention aims to solve the problems that it is difficult for an existing control method to reliably ensure that the actual operation requirement of a water chilling unit after load shedding is matched with the operation state, and the energy efficiency ratio parameter of the water chilling unit is not ideal. In order to achieve the purpose, the control method of the multi-unit air conditioning system can judge the loading and unloading requirements of the current air conditioning system on the basis of the outlet water temperature, and can also increase and decrease the unit number of the multi-unit air conditioning system according to the outlet water temperature after loading and unloading, the unit average load or the starting temperature difference on the basis, so that the matching degree of the operation requirement and the operation capacity of the multi-unit air conditioning system is further improved, the energy efficiency ratio parameter of the multi-unit air conditioning system is optimized, and the multi-unit air conditioning system can efficiently operate while the basic heat exchange requirement is met.

Description

technical field [0001] 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. Background technique [0002] In large places such as factories and shopping malls, indoor temperature control and water supply are usually carried out 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 supply water temperature. [0003] In the traditional control method, the heat exchange demand of the chiller is usually judged according to the water supply temperature of multiple chillers. If the refrigerating 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 so as to reduce the load of the multiple chillers. The disadvantage of the above-mentioned control method is that in so...

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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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