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Heat exchange and resistance calculation method for flat fin heat exchanger in air side laminar flow state

A technology of resistance calculation and heat exchanger, applied in calculation, computer-aided design, instrument, etc.

Pending Publication Date: 2019-10-08
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] There is currently no formula for calculating the effect of fin spacing on heat exchanger performance under laminar flow conditions

Method used

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  • Heat exchange and resistance calculation method for flat fin heat exchanger in air side laminar flow state
  • Heat exchange and resistance calculation method for flat fin heat exchanger in air side laminar flow state
  • Heat exchange and resistance calculation method for flat fin heat exchanger in air side laminar flow state

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Embodiment Construction

[0034] The present invention proposes a method for calculating heat transfer and resistance of a flat-fin heat exchanger under air-side laminar flow. In order to make the advantages and technical solutions of the present invention clearer and clearer, the present invention will be described in detail below in conjunction with specific examples.

[0035] 1. Model structure parameters.

[0036] like figure 1 As shown in the present invention, a heat transfer and resistance calculation method of a flat-fin heat exchanger under the air-side laminar flow state, firstly design the structural parameters of the fin heat exchanger (illustrated with the rated heat transfer of 5.0 kW) , mainly to determine the parameters such as fin spacing, thickness, tube spacing, tube row number, etc. The structural parameters are shown in Table 1:

[0037] Table 1

[0038] Structural parameters Numerical size unit Outer diameter 12.5 mm inner diameter 10 mm wall ...

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Abstract

The invention discloses a heat exchange and resistance calculation formula for a flat fin heat exchanger in an air side laminar flow state, which comprises the following steps of 1, establishing a finned tube model, and designing an orthogonal test working condition by taking the spacing, the thickness, the tube spacing, the tube row number, the inlet wind speed and the tube wall temperature of afin as the variable factors; and carrying out flow and heat transfer numerical calculation on different working conditions to obtain a change rule of the heat exchange amount and the flow resistance;2, on the basis of verifying a model calculation result, giving out a power function expression which takes the Reynolds number, the Pluronic number and the ratio of the fin spacing to the characteristic length as the independent variables and takes the Number of the heat exchange amount and the resistance factor of the flow resistance as the strain; and 3, fitting each coefficient value in the function relationship by adopting a least square method. The calculation formula can be used for calculating the heat exchange and the resistance of the flat-fin heat exchanger in a laminar flow state and determining the influence of the fin spacing on the performance of the flat-fin heat exchanger.

Description

technical field [0001] The invention relates to the field of thermal engineering, in particular to a method for calculating heat transfer and resistance of a flat-fin heat exchanger under the air-side laminar flow state. Background technique [0002] At present, flat-fin heat exchangers have been widely used in various fields of air conditioners and heat pumps due to their simple structure and easy processing. For its heat transfer and flow resistance characteristics, there are also various heat transfer correlations. The existing heat transfer correlations are the relationship between Nusselt number, Reynolds number and Prandtl number; the relationship between resistance factor and Reynolds number relation. These formulas are suitable for the calculation of the air-side flow velocity in turbulent state because the application occasions are mostly outdoors or the air flow state is in turbulent state. [0003] At present, with the development of the electronics industry, al...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/08G06F30/20
Inventor 丛晓春倪鹏飞范秀文董玉林
Owner SHANDONG UNIV OF SCI & TECH
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