Abstract
The creation of efficient and compact heat exchangers is one of the priority tasks arising during the design of heat and gas supply to industrial and residential buildings. As a rule, finned surfaces and turbulization of heat carrier flows are used to increase the efficiency of heat exchange in heat exchangers. The present paper proposes to use novel materials, namely porous material, in the design of highly efficient heat exchangers. The investigation was carried out experimentally and theoretically. To study the possibility of creating such heat exchangers, a multi-purpose test bench is created. The aim of the study was to assess the intensity of heat transfer in heat exchangers using porous metal. Laboratory tests are carried out as part of the experimental study. In the theoretical study, the classical equation for the change in the heat flux density when the coolant passes through the porous insert was used. As a result, a mathematical model was obtained in the form of a second-order differential equation. Boundary conditions were set and a particular solution was obtained. The results of theoretical calculations were compared with experimental data. The performed study experimentally confirmed the efficiency of using porous metal inserts in the design of shell-and-tube heat exchangers. The compiled mathematical model allows one to perform engineering calculations of the considered heat exchangers with porous inserts.
Highlights
Heat exchangers (HE) are one of the main units of heat and gas supply systems in industrial and residential buildings, the issue of improving their efficiency is relevant
Q is the modes of pump operation allows one to determine the intensity of heat transfer in the inserts
Q is the thermal power of the heat exchanger of the considered design
Summary
Heat exchangers (HE) are one of the main units of heat and gas supply systems in industrial and residential buildings, the issue of improving their efficiency is relevant. The main direction of improving the efficiency of HE equipment is to increase the intensity of heat exchange; most often this is achieved by the use of finned surfaces and turbulization of heat carrier flows [1,2]. It is advisable to use such methods for low Reynolds numbers when coolant flows in a transient mode When using such methods, there appears a moment when further turbulization of Energies 2020, 13, 5854; doi:10.3390/en13225854 www.mdpi.com/journal/energies. The finned heat exchange surface significantly exceeds the surface of the supporting pipes, and it is not subject to pressure from one side, the ribs can be thinner than the walls of the supporting pipes All this makes it possible to significantly reduce the consumption of metal required for producing heat exchange equipment
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