Abstract
Currently, porous metals are not used in heat supply systems. Usage of porous materials in heat exchangers increases the heat transfer intensity and makes the heat exchangers more compact. An experimental setup consisting of two circuits was developed in order to study the influence of porous metals on heat transfer intensity. In the first circuit the hot coolant is water, which flows through narrow tubes inside the porous metal. In the second circuit the cold coolant is freon. The purpose of the study is to obtain experimental confirmation of the hypothesis of an increase in the heat transfer intensity when using porous metals. To achieve this goal, experiments were carried out, which showed the increased heat transfer intensity. The standard methods for calculating heat exchangers cannot be applied in this case as the inner pores’ surface is unknown. A mathematical model was compiled allowing engineering calculations for the heat exchangers of this type. The hot water temperature inside the heat exchanger is determined analytically. The resulting equation allows us to determine the cooling degree of the first coolant, i.e. hot water. The obtained deviations between experimental and analytical data are within the acceptable limits, which indicates the reliability of the proposed model.
Highlights
One of the main tasks in production of modern heat transfer equipment is to achieve increased heat transfer intensity
One of the promising ways here is the use of porous metals in heat exchangers
Heat exchangers with porous metals can be obtained in various design solutions
Summary
One of the main tasks in production of modern heat transfer equipment is to achieve increased heat transfer intensity. Heat exchangers with porous metals can be obtained in various design solutions. There are plate heat exchangers, in which the inter-plate channels for coolant motion are filled with porous metal inserts with a high specific area of the inner frame surface and small equivalent diameters of the internal channels, providing a high rate of heat exchange of the working medium. The proposed design significantly increases heat transfer [1-3]. Porous-compact heat exchangers are used, the operation principle of which is based on intensification of heat transfer processes by introducing a porous filler made of materials with high thermal conductivity into the circuit channels. A highly porous material with a variable relative thickness of the porous material is used for filling in one of the most effective designs of such heat exchangers. The housing cross section is cylindrical round or oval. [4-8]
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