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Method for calculating pipe diameters of parallel running balance pipes of open cooling tower

A calculation method and technology of balancing tube, applied in measuring devices, instruments, measuring flow/mass flow, etc., can solve the problems that cannot meet the requirements of actual engineering use and are rare

Inactive Publication Date: 2011-08-24
香港华艺设计顾问(深圳)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, regarding the diameter of the balance pipe that is closely related to this phenomenon, there is no teaching material or specification that gives a calculation formula for the diameter of the pipe. The method of "same diameter" is used to estimate, but this estimation method has already appeared various problems in actual engineering, and can no longer meet the requirements of actual engineering.
And there are few studies on this issue

Method used

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  • Method for calculating pipe diameters of parallel running balance pipes of open cooling tower
  • Method for calculating pipe diameters of parallel running balance pipes of open cooling tower
  • Method for calculating pipe diameters of parallel running balance pipes of open cooling tower

Examples

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Embodiment Construction

[0058] Example.

[0059] An actual project chooses two flow rate of 250m 3 / h cooling tower, the design outlet pipe diameter is 200mm. The values ​​of each parameter are as follows: λ=0.037, ξ 弯头 = 1, ξ进口 = 0.9, ξ 弯头 = 0.9, ξ 蝶阀 =0.5, then ∑ξ c =3.3 The calculated flow rate of the balance pipe is 125m 3 / h. Δh is respectively taken as 0.2m, 0.3m and 0.4m for simulation calculation. The results are shown in Table 1.

[0060] Table I

[0061] Δh

[0062] It can be seen from the calculation results in Table 1 that, under a certain flow rate, the influence of Δh on the diameter of the balance pipe cannot be ignored. From the samples, the Δh values ​​of different cooling towers are not exactly the same, which tells us that when selecting a balance pipe, we cannot simply select the same diameter as the outlet pipe as the diameter of the balance pipe, but must Perform detailed calculations for specific devices.

[0063] f ( d...

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Abstract

The invention relates to a method for calculating pipe diameters of parallel running balance pipes of an open cooling tower. The method is characterized in that: according to the following equation, the pipe diameters of the balance pipes are calculated by a Newton iteration method. In the invention, the pipe diameters, in accordance with the project situation, of the balance pipes can be calculated according to actual engineering situation; therefore, the application of the actual engineering can be guided directly; and the current design situation that the pipe diameters of the balance pipes are mainly estimated is changed.

Description

technical field [0001] The invention belongs to the technical field of heating, ventilating and air-conditioning, and in particular relates to a method for calculating the pipe diameters of balance pipes in parallel operation of open cooling towers. Background technique [0002] During the actual operation of cooling towers, when they are running in parallel with a balance pipe at the bottom and no electric butterfly valve on the outlet pipe, and only part of the cooling towers are in operation, there will often be a phenomenon that one cooling tower is supplemented with water while the other cooling tower overflows , that is, the overflow phenomenon. At present, regarding the diameter of the balance pipe that is closely related to this phenomenon, there is no teaching material or specification that gives a calculation formula for the diameter of the pipe. The method of "same path" is used to estimate, but this estimation method has appeared various problems in actual engin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/10G01F1/00
Inventor 唐志国
Owner 香港华艺设计顾问(深圳)有限公司
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