Parallel flow heat exchanger and use

Abstract

The invention relates to a parallel flow heat exchanger, which comprises at least two stacked parallel flow heat exchange units, wherein each parallel flow heat exchange unit comprises a top flow collecting pipe, a bottom flow collecting pipe, and a plurality of parallel flat pipes communicating the top flow collecting pipe and the bottom flow collecting pipe; and the axial flowing length of a heat exchange medium on the top flow collecting pipe is larger than that on the bottom flow collecting pipe; and the axial flowing length on the top flow collecting pipe is as long as possible, while the axial flowing length on the bottom flow collecting pipe is as short as possible. The parallel flow heat exchanger improves the heat exchange medium of two-phase flow of gas and liquid remarkably, in particular solves problem of delamination of the gas and the liquid in refrigerant, so as to effectively solve the problem of uneven distribution of the gas and the liquid, improve heat exchange efficiency of the heat exchanger, and fully evaporate the refrigerant. At the same time, the parallel flow heat exchanger saves volume and reduces cost.

Description

Technical field [0001] The invention relates to the technical field of heat exchanger flow channel design, in particular to a parallel flow heat exchanger adopting a gas / liquid two-phase flow in a multilayer parallel flow structure and its use. Background technique [0002] Heat exchangers currently used in evaporators and condensers are generally classified into stacked heat exchangers and parallel flow heat exchangers. The so-called stacked heat exchanger is composed of a plurality of stacked heat exchanger units, which can theoretically be stacked without limitation. However, a heat exchanger unit of one size of this type of laminated heat exchanger requires a set of molds to manufacture, and it takes about 1 million yuan to open such a set of molds. If the size of the heat exchanger unit is changed, additional mold manufacturing needs to be opened, resulting in increased investment. [0003] The so-called parallel flow heat exchanger is a combination of flat tubes and upper a...

AI Technical Summary

Problems solved by technology

[0009] Although the above changes can partially achieve the problem of uniform distribution of fluid in stacked heat exchangers and parallel flow heat exchangers, the effect is still not very satisfactory

[0010] The present inventor found in the research process of the parallel flow heat exchanger that when the refrigerant flows in the bottom header of the parallel flow heat exchanger along the axial direction of the bottom header, the separation of gas and liquid due to the difference in kinetic energy and density The layers are much more serious than the stratification when the refrigerant flows axially along the bottom header in the top header of the heat exchanger, and after the gas and liquid are stratified, it will cause more serious uneven distribution of gas and liquid. This is a very headache problem in this industry all the time

[0011] In addition, the existing parallel-flow heat exchanger uses segmented flow channels for heat exchange. Since the volume of each segment of the flow channel is basically the same, it is also an important problem that causes uneven flow distribution.

[0012] In addition, the existing parallel flow heat exchangers all use side inlet and outlet, which increases the volume of the parallel flow heat exchanger and makes installation difficult

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