Optimal control method and system of central air conditioner water pump

Abstract

The invention belongs to the field of control over central air-conditioners and provides an optimal control method and system of a central air conditioner water pump. The central air conditioner water pump comprises a chilled water pump and a cooling water pump. The method includes the steps of regularly detecting whether the water outlet temperature of the chilled water pump is higher than the preset minimum water outlet temperature or not; if yes, carrying out PID adjustment on the frequency of the chilled water pump according to the preset return water supply temperature difference or preset return water supply pressure difference or forecasting loads of the chilled water pump; regularly detecting whether the current wet bulb temperature is smaller than or equal to the preset minimum wet bulb temperature; if yes, carrying out PID adjustment on the frequency of the cooling water pump according to the preset return water supply temperature difference of the cooling water pump; and if not, detecting the current water draining temperature of the cooling water pump and adjusting the frequency of the cooling water pump according to the current water draining temperature. The optimal control method and system of the central air conditioner water pump can adjust the frequency of the chilled water pump and the frequency of the cooling water pump dynamically, and lower the energy consumption of a central air conditioner system while effectively improving the refrigeration / heating efficiency of the central air conditioner system.

Description

technical field [0001] The invention belongs to the field of central air-conditioning control, and in particular relates to an optimal control method and system for a central air-conditioning water pump. Background technique [0002] Existing central air-conditioning systems all have the problem of large flow and small temperature difference between the air-conditioning chilled water system and the cooling water system. For example, in the central air-conditioning system of an office building, the temperature difference between the supply and return water of the chilled water system is usually designed to be 5°C during the summer cooling season. However, in actual operation, the maximum temperature difference between the supply and return water of the chilled water system Only 3°C. Because most of the time, the cooling water system of the central air-conditioning system can meet the cooling demand without fully operating. Therefore, the existing central air-conditioning sys...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an optimal control method and system for central air-conditioning water pumps, aiming to solve the problem that the existing central air-conditioning system runs for a short time under full load, causing all chilled water systems to operate at large flows most of the time Running under the condition of small temperature difference, the cooling efficiency is low, and the problem of serious energy waste is caused

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