Numerical calculation method for pressure drop and shunting uniformity of printed circuit board heat exchanger

Abstract

The invention discloses a numerical calculation method for pressure drop and shunting uniformity of a printed circuit board heat exchanger, a calculation object structure of the method comprises a heat exchanger core body and a cold and hot side interface cavity body, and the core body adopts a primary side plate and a secondary side plate which are alternately arranged; according to the method, a heat exchanger flow resistance multi-stage model is established based on a core body structure and flow channel sizes, pressure drop of each stage is established in combination with on-way resistance and local resistance formulas to calculate speed distribution in each flow channel of a core body, and finally the overall pressure drop of a working medium passing through the core body of the heat exchanger and relative flow uniformity in each flow channel are obtained. The invention provides a complete and effective numerical calculation method for the pressure drop and shunting uniformity of the printed circuit board heat exchanger, a direct calculation method and a numerical result are provided for the most concerned pressure drop and shunting uniformity of the heat exchanger core, the design cost is greatly reduced, and the design efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of printed circuit board heat exchangers, in particular to a numerical calculation method for pressure drop and split flow uniformity of a printed circuit board heat exchanger. Background technique [0002] The printed circuit board heat exchanger is a high-efficiency and compact heat exchanger. The core of the heat exchanger is composed of superimposed heat exchange plates arranged with dense and small-sized flow channels. The primary side heat exchange plate and the secondary side heat exchange plate Arranged alternately to form independent heat exchange areas. This structure makes the heat exchanger have the advantages of high heat exchange efficiency, high temperature resistance, high pressure resistance, etc., and is widely used in deep sea floating liquefaction, nuclear power, thermal power and other fields. [0003] In this context, in recent years, the design and analysis methods for printed circuit...

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Problems solved by technology

However, there is no effective calculation method for the pressure drop and split flow uniformity of this type of heat exchanger. There is no mature calculation model for the pressure drop calculation, and it is difficult to perform a complete limited calculation due to the huge number of heat exchanger core channels. Therefore, the overall pressure drop is usually estimated by referring to the empirical formula of flow resistance or the equivalent computational fluid dynamics model of the porous media model. The calculation of the heat transfer performance of the heat exchanger brings errors, which affects the overall safety of the heat exchanger, and the equivalent computational fluid dynamics model of the porous media model consumes a large amount of computing resources, lacking in economy and efficiency

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