Calculation Method for Flow Boiling and Flow Condensation of R134a and R1234yf in Conventional and Small Diameter Channels

Mikielewicz, Dariusz; Jakubowska, Blanka

doi:10.1515/pomr-2017-0032

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…Furthermore, the mixture of R290 and R600a can be one of the most appropriate refrigerants to replace R134a [7]. Recently, R1234yf has been believed to be a promising candidate as an alternative of R134a [8]. Its ODP is equal 0, whereas GWP = 4 and its thermophysical properties are similar to those of R134a.…”

Section: Introductionmentioning

confidence: 99%

An improved method for flow boiling heat transfer with account of the reduced pressure effect

Jakubowska

Mikielewicz

2019

Therm sci

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Original scientific paper https://doi.org/10.2298/TSCI19S4261JIn the paper are presented the results using the authors own model to predict heat transfer coefficient during flow boiling. The model has been tested against a large selection of experimental data to investigate the sensitivity of the in-house developed model. In the work are presented the results of calculations obtained using the semi-empirical model on selected experimental flow boiling data of the refrigerants: R134a, R1234yf, R600a, R290, NH 3 , CO 2 , R236fa, R245fa, R152a, and HFE7000. In the present study, particular attention was focused on the influence of reduced pressure on the predictions of the theoretical model. The main purpose of this paper is to show the effect of the reduced pressure on the predictions of heat transfer during flow boiling.

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Section: Introductionmentioning

confidence: 99%

An improved method for flow boiling heat transfer with account of the reduced pressure effect

Jakubowska

Mikielewicz

2019

Therm sci

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“…There are many available experimental investigations into flow boiling heat transfer of all mentioned above working fluids in the literature. Unfortunately, the results published for some of these fluids are still inconsistent and difficult in mathematical modelling [3]. In the literature there are many empirical correlations for modelling of flow boiling heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Comparison of predictive methods for flow boiling heat transfer in conventional channels and minichannels – the effect of reduced pressure

Mikielewicz

Jakubowska

2018

MATEC Web Conf.

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In the paper are presented the results of follow on studies from [1]–[3] using authors own model to predict heat transfer coefficient during flow boiling. The model has been tested against a large selection of experimental data collected from various researchers to investigate the sensitivity of the in-house developed model. The collected experimental data came from various studies from literature and were conducted for the full range of quality variation and a wide range of mass velocity and saturation temperatures. In the work are presented the results of calculations obtained using the in-house developed semi empirical model on selected experimental flow boiling data of the refrigerants: R134a, R1234yf, R600a, R290, NH3, CO2, R236fa, R245fa, R152a and HFE7000. In the present study the particular attention was focused on the influence of reduced pressure on the predictions of the theoretical model. The results of calculations were to test the sensitivity of the flow boiling model with respect to selection of the appropriate two-phase flow multiplier, which is one of the distinctive elements of the in-house model. The main purpose of this paper however is to show the effect of the reduced pressure on the predictions of heat transfer during flow boiling.

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“…Significant gains can be made also in these areas by increasing the efficiency of energy utilization, i.e., recovering low-grade waste heat [1], or improving process efficiency [2]. Boiling and condensation are associated with large rates of heat transfer because of the latent heat of evaporation and because of the enhancement of the level of turbulence between the liquid and the solid surface [3,4]. Achieving of high heat fluxes can be obtained by means of numerous technologies: microchannels [5], microjets [6], hybrid microjet-microchannels [7], etc.…”

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confidence: 99%

Archives of Thermodynamics

Muszyński¹,

Andrzejczyk²,

Park³

et al. 2019

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The paper presents an experimental investigation of a silicone based heat exchanger, with passive heat transfer intensification by means of surface enhancement. The main objective of this paper was to experimentally investigate the performance of a heat exchanger module with the enhanced surface. Heat transfer in the test section has been examined and described with precise measurements of thermal and flow conditions. Reported tests were conducted under steady-state conditions for single-phase liquid cooling. Proposed surface modification increases heat flux by over 60%. Gathered data presented, along with analytical solutions and numerical simulation allow the rational design of heat transfer devices.

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Calculation Method for Flow Boiling and Flow Condensation of R134a and R1234yf in Conventional and Small Diameter Channels

Abstract: ABSTRACT

Cited by 7 publications

References 33 publications

An improved method for flow boiling heat transfer with account of the reduced pressure effect

An improved method for flow boiling heat transfer with account of the reduced pressure effect

Comparison of predictive methods for flow boiling heat transfer in conventional channels and minichannels – the effect of reduced pressure

Archives of Thermodynamics

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