Design method of transverse flow type cooling tower

Abstract

The invention relates to a design method of a transverse flow type cooling tower. The design method comprises the following steps: I, modifying a Lewis relational expression; II, modifying a characteristic number of a cooling tower; III, meshing a calculation area space, and performing iterative computation according to the step I, the step II and the equation as shown in the specification to obtain parameters of final water outlet temperature and air outlet state of grids; IV, performing iterative computation according to the equation as shown in the specification and the calculation result of the step III to obtain the moisture content of air discharged from the tower; V, performing iterative computation according to a backflow rate equation as shown in the specification and the calculation result of the step III to obtain the enthalpy of air discharged from the tower; VI, modifying the water outlet temperature and the tower inlet / outlet air state parameter of the transverse flow type cooling tower according to the Lewis number and packing coefficients obtained from the step I to the step V. According to the design method, the Lewis number and the packing coefficients are sufficiently considered for modification and backflow, the calculation accuracy is very high, the calculation result is fit with the practical measurement result, and the technical problem that the inlet / outlet temperature and the humidity of the tower cannot be solved by taking the enthalpy value as an intermediate quantity is solved.

Description

technical field [0001] The invention relates to a design method of a cross-flow cooling tower considering Lewis number and packing coefficient deviation correction. 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 transfer 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 calculation results of the traditional design method deviate greatly from the actual measurement results. For example, the enthalpy value is used as the intermediate variable in the calculation, so the temperature and humidity of the outlet air from the cooling tower cannot be accurately calculated. Usually, the relative humidity of the air outlet from the tower is assumed to be 95% to 100%, which artificially causes errors....

AI Technical Summary

Problems solved by technology

For example, the enthalpy value is used as the intermediate variable in the calculation, so it is impossible to accurately calculate the temperature and humidity of the cooling tower outlet air. Usually, it is assumed that the relative humidity of the air outlet from the tower is 95% to 100%, which artificially causes errors.

[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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