Method for controlling cooling tower outlet water temperature according to outdoor air state

Abstract

The invention relates to a method for controlling cooling tower outlet water temperature according to outdoor air state, which is characterized by comprising the following steps: 1) determining the lowest outlet water temperature of the cooling tower and the maximal efficiency of the cooling tower according to the properties of the refrigerating unit and cooling tower; 2) measuring and obtaining the outdoor air state; 3) calculating the cooling tower efficiency in the current state; 4) correspondingly adjusting the switch of the cooling tower fan motor and the by-pass valve of the frequency converter and cooling tower according to the actual cooling tower efficiency and outdoor air state; and 5) repeating the steps 1)-4) at time intervals T (T is usually 5 minutes to 3 hours). By using the method, the outlet water temperature of the cooling tower changes as the outdoor air state changes, thereby keeping the lowest outlet water temperature value of the cooling tower and enhancing the actual operation energy efficiency of the refrigerating machine. The method obviously enhances the operating efficiency of the refrigerating unit, and has the characteristic of energy saving.

Description

Technical field [0001] The invention relates to a method for controlling the outlet water temperature of a cooling tower according to the outdoor air state. It belongs to the technical field of building HVAC. Background technique [0002] The cooling tower is an indispensable part of the water-cooled central air conditioning system. The outlet water temperature of the cooling tower has a great influence on the operating efficiency of the central air-conditioning chiller. On the premise that the outlet water temperature is not lower than the minimum temperature for safe operation of the chiller, the lower the outlet water temperature of the cooling tower, the higher the energy efficiency ratio of the chiller. Conversely, the higher the outlet water temperature of the cooling tower, the lower the energy efficiency ratio of the refrigerator. [0003] At present, most cooling towers of central air-conditioning systems work under fixed conditions. For example, a common operating condi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the outlet water temperature of the existing cooling tower cannot be fully changed according to the outdoor air state, the actual operating energy efficiency ratio of the refrigerator is low, and energy waste is caused, and to provide a method for controlling the outlet water of the cooling tower according to the outdoor air state. temperature method

Images