For buildings with a certain amount of cooling demand in winter or in the transitional season, air-conditioning cold water should be provided by cooling towers when technical and economic analysis is reasonable. In the description of the article, there are explanations as follows: in some winter or transition seasons, buildings that require cooling are required. When outdoor conditions permit, the use of cooling towers to directly supply air-conditioning and cold water reduces the time for running chillers throughout the year. Promotion of energy saving measures. The usual system approach is: When an open cooling tower is used, the water cooled by the cooling tower is used as primary water, and the secondary air conditioning cold water is supplied through the plate heat exchanger (if it is a closed cooling tower, the plate heat exchanger is not passed. , directly provided), and then switch the valve to the air conditioning cold water system to supply cold water to the air conditioning unit, while stopping the operation of the chiller. Regardless of the type of cooling tower used, the water supply temperature required for the end of the air conditioner and the water temperature that the cooling water can provide are calculated according to the local transitional season or winter climatic conditions, and data such as increased investment and payback period are obtained. It can be used when it is reasonable. Two common implementations of natural cooling:
(1) Direct natural cooling means that the cooling water is connected to the chilled water system through the bypass system, and the cooling tower and the end device are directly connected. When the outdoor wet bulb temperature is lower than the chilled water supply temperature is about 5 °C, you can switch to this mode of operation. Since the method directly connects the cooling water system and the chilled water system, the cleaned chilled water pipeline is easily contaminated by the cooling water, which is easy to cause corrosion of the pipeline and blockage of the coil, so it is difficult to implement in the open cooling tower system, and is generally suitable for closing. Cooling tower system.
(2) Indirect natural cooling, that is, adding a plate heat exchanger to the system in parallel with the condenser, and switching from the freezer to the heat exchanger when the outdoor wet bulb temperature is lower than the chilled water supply temperature of about 5 °C. Since indirect natural cooling uses a plate heat exchanger to isolate the chilled water from the cooling water system, it does not pollute the chilled water line, so both open and closed cooling towers are suitable. At present, this method is often used in engineering.
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