Design method of counter flow cooling tower

Abstract

The invention relates to a design method of a counter flow cooling tower. The method comprises the following steps: 1, setting the Lewis number to be 1 and correcting a Lewis relation formula; 2, correcting the performance number N of the cooling tower by a correction coefficient k2; 3, iteratively calculating according to the steps 1 and 2 and a formula described in the specifications to obtain the outlet water temperature of the counter flow cooling tower; 4, iteratively calculating by a formula described in the specifications according to the same line relationship of state points of air entering and exiting from the tower and state points of atmosphere on a psychrometric chart to obtain the moisture content of the air exiting from the tower; 5, iteratively calculating according to a reflux ratio formula to obtain the enthalpy value of the air exiting from the tower; 6, obtaining the corrected outlet water temperature and the corrected state parameters of the air entering and exiting from the tower in the counter flow cooling tower which takes the Lewis number and a filler coefficient into account. According to the design method, the Lewis number and the filler coefficient are fully considered during correction and reflux, the calculation precision is very high, a calculation result is matched with an actual measurement result, and the technical problem that the temperature and humidity of the air entering and exiting from the tower cannot be calculated by taking the enthalpy value as the intermediate quantity is solved.

Description

technical field [0001] The invention relates to a design method of a counter-flow cooling tower considering the deviation correction of Lewis number and packing coefficient. Background technique [0002] The cooling tower is an important equipment in the air-conditioning system, and its operating performance will have a direct impact on the heat exchange of the condenser, thereby affecting the operating efficiency of the entire air-conditioning system. [0003] For mechanical ventilation cooling towers, the traditional design method has great limitations, and the calculated results of the traditional design method deviate greatly from the measured results. For example, the enthalpy value is used as the intermediate variable in the calculation, so it is impossible to accurately solve the temperature and humidity of the cooling tower outlet air. Usually, the relative humidity of the outlet air is assumed to be 95% to 100%, which artificially causes errors. [0004] Since the ...

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Problems solved by technology

[0004] Since the relative humidity of the air out of the tower deviates from the design conditions, it is impossible to ensure that the relative humidity is maintained at 95% to 100%. These are the keys to analyze the influence of the cooling tower air outlet on the surrounding thermal environment; in addition, the Lewis relation is often used in the calculation, and this relation is derived under the condition of equal enthalpy humidification, which is not necessarily necessary for the calculation and design of the cooling tower. This relation is applicable; after the tower has been in operation for a period of time, the packing system deviates from the design value due to packing damage and uneven water distribution; after the deviation, the cooling effect of the tower becomes worse and the cooling capacity decreases. To ensure the same heat dissipation, only add Large air volume and water flow, thus increasing the energy consumption of the tower

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