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Microchannel-Type Evaporator and System Using the Same

a microchannel-type evaporator and evaporator technology, applied in indirect heat exchangers, lighting and heating apparatuses, laminated elements, etc., can solve the problem of reducing the heat exchange capacity of evaporators in a region of high heat flux, and achieve the effect of increasing the heat exchange efficiency of a microchannel-type evaporator and reducing the size of the evaporator

Inactive Publication Date: 2008-01-17
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] In the heat transfer surface 101, the gas-liquid interface 104 as an interface between a wet region in the upstream of the dryout position and a dispersed flow region 103 moves toward the upstream as the heat flux increases. Accordingly, when the heat flux is increased, the wet region 102, where heat transfer is effectively performed, is reduced, so that the heat exchange efficiency of the entire heat transfer surfaces is reduced. In order to increase the heat exchange efficiency, it is necessary to increase the proportion of the wet region 102 having high heat transfer efficiency in the heat transfer surface.
[0016] The present invention was made in the light of the aforementioned problem, and an object of the invention is to increase the heat exchange efficiency of a microchannel-type evaporator and reduce the size thereof.

Problems solved by technology

However, the conventional evaporator has a problem of reduction of heat exchange capability in a region of high heat flux.

Method used

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  • Microchannel-Type Evaporator and System Using the Same
  • Microchannel-Type Evaporator and System Using the Same
  • Microchannel-Type Evaporator and System Using the Same

Examples

Experimental program
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Effect test

embodiment 1

[0045] FIGS. 1(a), 1(b), and 1(c) show a basic constituent unit of Embodiment 1 of the evaporator according to the present invention.

[0046] An evaporator 1 in this embodiment includes two heat transfer plates 2 opposite to each other. Between the heat transfer plates 2, a path 3 through which liquid to be evaporated passes is provided. The path 3 through which liquid to be evaporated passes is placed vertically, that is, along the direction G of gravity force. In the present invention, vertically setting the liquid path means setting the liquid path at such an angle that heat transfer properties in the right and left heat transfer surfaces which form a microchannel do not significantly lose symmetry because of the inclination thereof and, for example, includes setting the same at an angle of ± about 20 degrees from the vertical.

[0047] Furthermore, in the outside of the heat transfer plates 2, paths 4 through which heating gas passes, is provided. To form a real evaporator, it is p...

embodiment 2

[0062] FIGS. 3(a), 3(b), and 3(c) show a basic constituent unit of Embodiment 2 of the evaporator according to the present invention.

[0063] The configuration of the evaporator 1 itself of Embodiment 2 is, similar to the configuration of the evaporator of Embodiment 1, of the countercurrent flow type in which the flow directions of the liquid to be evaporated and the heating gas are opposite to each other. This embodiment is an embodiment in the case where the mass flow rate of the heating gas is not negligible compared to that of the liquid to be evaporated and the temperature of the heating gas decreases from the gas inlets 7 to the gas outlets 8.

[0064]FIG. 4 shows a change (a dashed line) in heat flux from the heating gas to the liquid to be evaporated and critical heat flux of each path space in this embodiment. As indicated by the dashed line of FIG. 4, the heat flux is low where the quality is small, and the heat flux is high where the quality is large. This is because the fo...

embodiment 3

[0069] FIGS. 5(a), 5(b), and 5(c) show a basic constituent unit of Embodiment 3 of the evaporator according to the present invention.

[0070] As shown in FIG. 5(a), an evaporator 1 in this embodiment is an embodiment in which space between two opposite heat transfer plates 2 serves as a liquid path 3. Sections outside of the heat transfer plates 2 serve as gas paths 4. To form a real evaporator, it is preferable that the evaporator has a structure in which a plurality of the basic constituent units shown in the drawing are arranged in parallel.

[0071] At the lower end of the liquid path 3, a liquid inlet 5, through which the liquid to be evaporated is supplied to the evaporator 1, is provided. At the upper end of the liquid path, a vapor outlet 6 is provided. The liquid to be evaporated evaporates as flowing from the bottom to the top of the evaporator 1. On the other hand, the heating gas is supplied from gas inlets 7, which are provided at the lower end of the evaporator, and disch...

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PUM

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Abstract

In an evaporator 1, space between two heat transfer plates 2 opposite to each other serves as a liquid path 3, and the outsides of the heat transfer plates 2 serve as a gas path 4. At the lower end of the liquid path 3, a liquid inlet, through which liquid to be evaporated is supplied to the evaporator 1, is provided, and at the upper end of the liquid path 3, a vapor outlet is provided. The liquid to be evaporated vaporizes while flowing from bottom to top. The heating gas is supplied form a gas inlet 7, which is provided at the upper end of the evaporator, and discharged from a gas outlet 8, which is provided at the lower end of the evaporator. Size of space S of the liquid path 3 gradually increases from bottom to top in a gas-liquid two phase region 11.

Description

TECHNICAL FIELD [0001] The present invention relates to a microchannel-type evaporator in which a path for a liquid to be evaporated is narrower than diameter of departing bubbles and to a system using the same. BACKGROUND ART [0002] In a fuel cell, fuel gas such as hydrogen and oxidant gas containing oxygen are electrochemically reacted through electrolyte, and electric energy is directly extracted from electrodes provided on both sides of the electrolyte. A polymer electrolyte fuel cell using a solid polymer electrolyte operates at low temperature and is easy to use. Accordingly, the polymer electrolyte fuel cell has attracted attention as a power supply for vehicles. [0003] As a method of supplying hydrogen to the fuel cell, there are a method of directly supplying hydrogen from a hydrogen storage unit such as high-pressure hydrogen tank or a hydrogen storage alloy tank and a fuel reforming method of extracting hydrogen from fuel such as methanol or hydrocarbon and supplying the ...

Claims

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Application Information

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IPC IPC(8): F28F3/12F28F13/08
CPCF28D2021/0064F28F13/08F28D2021/0071
Inventor TASAKI, YUTAKA
Owner NISSAN MOTOR CO LTD
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