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Method for establishing fan coil heat exchange model applicable to different working conditions

A technology of fan coil unit and establishment method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as large errors

Inactive Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the conventional heat transfer model calculation method cannot meet the actual needs, and the error is relatively large

Method used

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  • Method for establishing fan coil heat exchange model applicable to different working conditions
  • Method for establishing fan coil heat exchange model applicable to different working conditions
  • Method for establishing fan coil heat exchange model applicable to different working conditions

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0029] Concrete steps of the present invention are as follows:

[0030] 1. Establish the model of the total heat transfer coefficient of the fan coil unit:

[0031] The thermal calculation of the fan coil unit is performed approximately according to the water-cooled surface cooler. Therefore, the overall heat transfer coefficient K is mainly determined by the inner surface heat transfer coefficient α i and the external surface heat transfer coefficient α o Decide:

[0032] K = [ 1 α o φ 0 ξ p + τδ λ ...

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Abstract

The invention discloses a method for establishing a fan coil heat exchange model applicable to different working conditions. The method comprises the following steps of: establishing a fan coil overall heat transfer coefficient model; converting the current air inlet state and the current air outlet state into an air inlet state and an air outlet state under an equivalent dry working condition according to an equivalent working condition principle to make an overall heat transfer coefficient uninfluenced by a dehumidifying coefficient; simplifying the fan coil overall heat transfer coefficient model into the overall heat transfer coefficient under the equivalent dry working condition; and establishing the fan coil heat exchange model, and simplifying the fan coil heat exchange model. By adoption of the method, the fan coil heat exchange model applicable to different working conditions is established, and the heat exchange characteristic of a fan coil can be conveniently and accurately computed through a small number of independent control variables; moreover, the dehumidifying coefficient is not required during establishment of the fan coil heat exchange model, a wet working condition can be converted into the equivalent dry working condition for computation, and high applicability is realized, so that the whole central air-conditioning system can be controlled to operate efficiently and reasonably, and unnecessary energy consumption is reduced.

Description

technical field [0001] The invention relates to a central air-conditioning refrigeration heat exchange method, in particular to a fan coil heat exchange model establishment method applicable to different working conditions. Background technique [0002] As the terminal device in the semi-centralized central air-conditioning system, the fan coil unit performs heat exchange between the indoor air and the chilled water inside the coil through forced convection, which plays an important role in the air conditioning operation of the semi-centralized central air-conditioning system. The performance of the fan coil unit and whether it can maximize its effect will directly affect the operation of the semi-centralized central air-conditioning system and the quality of indoor air. It can be seen from the variable working condition characteristics of the fan coil unit that the cooling capacity of the fan coil unit changes under different working conditions. The fan coil unit selection...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 杨春节凌飞肖冬峰黄龙诚方雄
Owner ZHEJIANG UNIV
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