Efficiency of heat transfer in recuperative heat exchangers with high-speed gas flows at low Prandtl numbers

Arbekov, A. N.; Surovtsev, I. G.; Dermer, P.B.

doi:10.1134/s0018151x14030031

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…In [20] an attempt was made to clarify the NTU parameter in variable operation modes depending on the temperatures of the heat exchanging media. Dependencies are given for a two-stage scheme of connection of hot water heaters in a heat point -for a first stage of heater…”

Section: Literature Reviewmentioning

confidence: 99%

“…For heat recovery heat exchangers and gas cooling under dry heat exchange conditions, formula (1) takes the form [12,20]…”

Section: Introductionmentioning

confidence: 99%

“…For heat exchangers, in which the flows of the primary and secondary coolants are not equal and constantly changing, for example, for hot water heaters, the ratio (3) will not be fulfilled. Whereas the efficiency of the heat exchanger can be found as [12,20] 21 11…”

Section: Introductionmentioning

confidence: 99%

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Research of variable characteristics of heat exchange equipment

Rafalskaya

Rudyak

2019

E3S Web Conf.

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Heat exchangers used in various industries, most often work in conditions of variable flows and temperatures. At the same time, the existing theories of calculation of heat exchanger modes are based on the use of constant dimensionless parameters in any mode of operation. The purpose of this work is to obtain dependencies to determine the effect of coolant temperatures on the variable parameter of the heat exchanger. Using the simulation method, dependencies were found that describe the change in the heat exchanger parameter which made it possible to obtain a general formula for the change in the heat exchanger parameter at varying coolant temperatures. To test the applicability of the existing relations describing the change in the heat exchanger parameter and the formula obtained, a large number of heat exchangers were calculated in variable operating modes. Comparison with the simulation results showed that the ratios of the known theories of heat exchangers do not work in all modes and their application can lead to significant errors. A formula has been obtained allows one to find the effect of coolant temperatures on the variable parameter of the heat exchanger. The formula can be used to predict the modes of large systems.

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Section: Literature Reviewmentioning

confidence: 99%

“…For heat recovery heat exchangers and gas cooling under dry heat exchange conditions, formula (1) takes the form [12,20]…”

Section: Introductionmentioning

confidence: 99%

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Research of variable characteristics of heat exchange equipment

Rafalskaya

Rudyak

2019

E3S Web Conf.

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“…TURBINE POWER PLANT Following the theory of similarity and dimensional analysis [6,7] in order to provide for a greater univer sality of results, let us introduce the following relative and specific characteristics of the CGTPP cycle:…”

Section: Characteristics Of a Closed Gasmentioning

confidence: 99%

“…Influence of the degree of pressure increase on the relative work of the CGTPP operating in various thermo dynamic cycles: Influence of the degree of pressure increase on the amount of heat removed from the terminal cooler of CGTPP operating in various thermodynamic cycles: (1) cycle 1; (2) cycle 1R; (3) cycle 1Q; (4) cycle 1H; (5) cycle 1Q1R; (6) cycle 1Q1R1H;(7) in the intermediate cooler.…”

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confidence: 99%