Experimental investigation of the heat exchange intensity

Davletbaev, Vladimir; Rydalina, Natalia; Antonova, Elena

doi:10.1051/matecconf/201824507002

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…The average value of a series of experiments was found. The obtained values determined the freon mass flow rate and the amount of heat Q transferred from water to freon [19].…”

Section: Methodsmentioning

confidence: 99%

The use of porous metals in the design of heat exchangers to increase the intensity of heat exchange

2020

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Heat exchangers are widely used in heat supply systems. To increase the efficiency of heat supply systems, heat exchangers with porous metals are proposed to design. There was a test facility set up to study new types of heat exchangers. The countercurrent flow of heat carriers was activated in those heat exchangers. Freon moved through the heat exchanger pores, and water moved through the inner tubes. It should be noted that the porous materials in the heat exchangers differed in the coefficient of porosity. To be compared, one of the heat exchangers did not contain any porous material. The first test cycle proved the feasibility of using porous metals in heat exchange equipment. Afterwards, a simplified mathematical model of the heat exchanger was compiled. Such an analytical form makes a solution convenient for engineering calculations. Numerical calculations based on this model were compared with the experimental data. Heat transfer intensity of materials with different porosity was compared.

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“…The average value of a series of experiments was found. The obtained values determined the freon mass flow rate and the amount of heat Q transferred from water to freon [19].…”

Section: Methodsmentioning

confidence: 99%

The use of porous metals in the design of heat exchangers to increase the intensity of heat exchange

2020

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“…In heat exchangers of the "liquid-gas" type, a two-phase heat carrier can also be used. The designs of such heat exchangers can also contain porous metals for the flow of one of the coolants [25]. Such devices are most often used to stabilize the temperature of one of the coolants.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Efficiency of Using Heat Exchangers with Porous Inserts in Heat and Gas Supply Systems

et al. 2020

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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.

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Heat-exchange units with porous inserts

et al. 2019

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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.

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Experimental investigation of the heat exchange intensity

Cited by 11 publications

References 4 publications

The use of porous metals in the design of heat exchangers to increase the intensity of heat exchange

The use of porous metals in the design of heat exchangers to increase the intensity of heat exchange

Analysis of the Efficiency of Using Heat Exchangers with Porous Inserts in Heat and Gas Supply Systems

Heat-exchange units with porous inserts

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