Volume minimization-based design method and device of warped heat exchanger

A design method and heat exchanger technology, applied in the direction of instruments, calculations, special data processing applications, etc., can solve the problem that the heat exchanger cannot meet the volume

Active Publication Date: 2018-09-28
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a design method and device for warped heat exchangers based on volume minimization, so as to at least solve the technical problem that existing heat exchangers cannot meet the requirements of small size, light weight, efficiency and pressure loss

Method used

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  • Volume minimization-based design method and device of warped heat exchanger
  • Volume minimization-based design method and device of warped heat exchanger
  • Volume minimization-based design method and device of warped heat exchanger

Examples

Experimental program
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Effect test

Embodiment 1

[0076] According to an embodiment of the present invention, a design method for tilted heat exchangers based on volume minimization is provided, see figure 2 ,include:

[0077] Step 1. Determine the fin size used for each stream according to the inlet and outlet pressures and heat transfer temperature zones of each stream;

[0078] Step 2. Calculate the enthalpy change of each stream according to the working fluid type and thermal parameters of each stream, and link to the physical property database, and determine the number of channels of each stream according to the enthalpy change of each stream;

[0079] Step 3. Determine the effective width of each stream according to the mass flow rate of each stream and the maximum flow rate in the heat exchanger;

[0080] Step 4. Calculate the heat transfer coefficient of each stream according to the effective width, mass flow rate, fin size and channel number of each stream, and link the physical property database, and calculate the...

Embodiment 2

[0107] According to another aspect of the embodiment of the present invention, a device for designing a tilted heat exchanger based on volume minimization is provided, see image 3 ,include:

[0108] The fin size determination unit is used to determine the fin size used for each stream according to the inlet and outlet pressures and heat exchange temperature zones of each stream;

[0109] The channel number determination unit is used to calculate the enthalpy change of each stream according to the working medium type and thermal parameters of each stream and link to the physical property database, and determine the channel number of each stream according to the enthalpy change of each stream;

[0110] A width determination unit is used to determine the effective width of each stream according to the mass flow rate of each stream and the maximum flow rate in the heat exchanger;

[0111] The length and pressure loss preliminary determination unit is used to calculate the heat t...

Embodiment 3

[0133] The design parameters are

[0134] Stream

Fluid

qm(g / s)

Tin(K)

pin(bar)

Tout(K)

Pout(bar)

A

Helium

22.4

14.2

9.96

<10

>9.95

B

Helium

40

9.79

1.18

>12.80

>1.16

[0135] Initially designed fin size (mm)

[0136]

[0137] The runner arrangement is: (BA / 12)B, the effective width is 270mm, the effective length is 620mm, and the effective volume is about 20.82L.

[0138] The export parameters obtained by the commercial plate-fin heat exchanger design software Aspen Plate-Fin are:

[0139]

[0140] Because there is an error of about 20% in the heat transfer j and f factor fitting formulas, there should be a margin of about 20% in the pressure loss and effective length; the pressure loss at the low-pressure end is 755.7Pa, and the magnification of 20% is 755.7*1.2= 906.84Pa<2000Pa=0.02bar meets the requirements; the effective length is 620mm, and the effective length must be 620 / 1.2=...

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Abstract

The invention relates to a volume minimization-based design method and device of a warped heat exchanger. The design method comprises the following steps of: determining the fin size adopted by each stream; calculating the enthalpy change of each stream and determining the channel number of each stream according to the enthalpy change of each stream; determining the effective width of each stream;calculating the heat exchange coefficient of each stream and preliminarily determining the effective length of each stream and the obtained pressure loss of each stream through linking a physical property database and according to the effective width, the mass flow, the fin size and the channel number of each stream; calculating the ratio of the preset allowable pressure loss to the obtained pressure loss of each stream, correcting the channel number of each stream according to the minimum value in ratios until the channel number of each stream is up to a preset value and finally determiningthe effective length of each stream. By means of the design method and device, a heat exchanger which is small in volume and light in weight and meets the efficiency and pressure loss requirements canbe designed only by inputting relevant parameters such as mass flow rate of each stream in the heat exchanger, temperature and pressure at inlet, outlet and air exhaust points and the like.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to a method and device for designing a warped heat exchanger based on volume minimization. Background technique [0002] In recent years, the demand for low-temperature refrigeration systems has grown rapidly in many fields. The current low-temperature refrigeration devices have been used in aerospace, nuclear energy utilization, medical equipment, basic physics research and other fields and play an important role in them. The low temperature plate-fin heat exchanger is a key component of the low temperature refrigeration system, and its volume directly determines the volume of the low temperature cold box, which is related to the volume of the entire low temperature refrigeration system. If the volume of the heat exchanger is too large, the volume of the entire low-temperature cold box and even the entire low-temperature refrigeration system must be too large, which will bring a lot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 朱伟平龚领会徐鹏王坤祥邹龙辉贾启明李金峰
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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