Experimental thermal and hydraulic characterization of R448A and comparison with R404A during flow boiling

Lillo, Gianluca; Mastrullo, R.; Mauro, A.W.; Pelella, F.; Viscito, Luca

doi:10.1016/j.applthermaleng.2019.114146

Cited by 35 publications

(8 citation statements)

References 40 publications

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“…Successively, it passes through the test section where the pressure drop is measured; finally, the saturated fluid condenses into a plate heat exchanger and goes into a liquid receiver and a subcooler before closing the loop with the pump suction head. More information about the whole experimental test rig and its components can be found in previous publications of the same authors [7,8]. The test section is made of a horizontal stainless-steel tube (AISI SS316) having an inner diameter of 6.00 ± 0.05 mm and an external diameter of 8.0 ± 0.05 mm.…”

Section: Refrigerant Loop Test Section and Measurement Instrumentationmentioning

confidence: 99%

Adiabatic frictional pressure gradient during flow boiling of pure refrigerant R1233zd and non-azeotropic mixtures R448A, R452A and R455A

Arcasi

Mastrullo

Mauro

et al. 2022

J. Phys.: Conf. Ser.

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The research on two-phase flow characteristics of refrigerants is of primary importance in several fields, such as air conditioning and refrigeration systems. Therefore, the determination of the pressure drop during flow boiling is important for the correct design of evaporators and heat spreaders systems. This paper presents a collection of experiments on flow boiling pressure drop using pure refrigerant R1233zd and new low-GWP refrigerant mixtures R448A, R452A and R455A. All tests were performed in adiabatic conditions, in a smooth horizontal stainless-steel tube having an internal diameter of 6.0 mm and a thickness of 1.0 mm. The effect of operating parameters, such as (bubble) saturation temperature (from 25 to 65 °C) and mass flux (from 150 to 600 kg/m2s) is investigated and discussed, and the performance of the chosen fluids is also compared. Finally, an assessment of existing prediction methods is carried-out to find the most suitable correlations for two-phase pressure drop evaluation.

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Section: Refrigerant Loop Test Section and Measurement Instrumentationmentioning

confidence: 99%

Adiabatic frictional pressure gradient during flow boiling of pure refrigerant R1233zd and non-azeotropic mixtures R448A, R452A and R455A

Arcasi

Mastrullo

Mauro

et al. 2022

J. Phys.: Conf. Ser.

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“…On the internal surface, the heat transfer coefficient at the top (θ = 0 • ), bottom (θ = 180 • ), and side (θ = 90 • and θ = 270 • ) locations are presumed. As a first attempt, the values in the singular points can be chosen from the conventional 1-D data reduction (using Equations (7), (8) and (10)). The heat transfer coefficient profile in the azimuthal direction h = f (θ) may be constructed by imposing its passage through the three singular points and, for symmetry reasons, the minimum or maximum heat transfer coefficient values at the top and the bottom points, as shown in Equations (14) and 15:…”

Section: -D Data Reductionmentioning

confidence: 99%

“…For the present analysis, the values of C = 1.15 and ε = 0.003 • C were chosen. With regard to the meshing process, the number of elements in the radial direction was chosen after a careful sensitivity analysis carried out using the 2-D model as a numeric 1-D solution (deactivating the conduction term in the circumferential direction) with several values of dr and comparison of the inner tube wall temperature to the analytical solution of Equation (10). The analysis was performed by considering an imposed external heat flux q o equal to 7500 W/m 2 , a measured outer wall temperature of 38.8 • C, and internal and external diameters of 6 and 8 mm, respectively, with a thermal conductivity of 16.26 W/mK (AISI 304 stainless steel tube).…”

Section: -D Data Reductionmentioning

confidence: 99%

“…A comprehensive amount of scientific research has already been carried out to investigate the boiling performance of new low-global warming potential (GWP) refrigerants by testing a wide range of fluids [7][8][9][10][11], tube geometries [12], channel orientations [13], and operating conditions [14]. In these works, different data analysis methods were independently proposed according to, for instance, the measurement instrumentation at disposal and the tube heating method.…”

Section: Introductionmentioning

confidence: 99%

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Peripheral Heat Transfer Coefficient during Flow Boiling: Comparison between 2-D and 1-D Data Reduction and Discussion about Their Applicability

Mastrullo

Mauro

2019

Energies

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This paper presents a critical analysis of possible data reduction procedures for the evaluation of local heat transfer coefficient during flow boiling experiments. The benchmark method using one-dimensional (1-D) heat transfer in a heated tube was compared to a new data reduction method in which both radial and circumferential contributions to the conductive heat transfer inside a metal tube are considered. Using published experimental flow boiling data, the circumferential profiles of the wall superheat, inner wall heat flux, and heat transfer coefficients were independently calculated with the two data reduction procedures. The differences between the two methods were then examined according to the different heat transfer behavior observed (symmetric or asymmetric), which in turn was related to the two-phase flow regimes occurring in a channel during evaporation. A statistical analysis using the mean absolute percentage error (MAPE) index was then performed for a database of 417 collected flow boiling data taken under different operating conditions in terms of working fluid, saturation temperature, mass velocity, vapor quality, and imposed heat flux. Results showed that the maximum deviations between the two methods could reach up to 130% in the case of asymmetric heat transfer. Finally, the possible uses of the two data reduction methods are discussed, pointing out that the two-dimensional (2-D) model is the most reliable method to be employed in the case of high-level modeling of two-phase flow or advanced design of heat exchangers and heat spreader systems.

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“…Although R448A is considered as a potential alternative, studies focusing on the performance of R448A inside the evaporator remain limited. Lillo [5] experimentally investigated the boiling heat transfer and pressure drop of R448A and compared these parameters with that of R404A inside a 6 mm tube. They observed that R404A had a higher heat transfer coefficient at low vapor quality.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Two-Phase Flow Boiling Heat Transfer Coefficient and Pressure Drop of R448A inside Multiport Mini-Channel Tube

Hoang

Agustiarini

2022

Energies

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Regulations and restrictions against high global warming potential (GWP) refrigerants have been introduced to encourage the adoption of environmentally friendly refrigerants and mitigate the environmental impact of the HVAC industry. R448A, a zeotropic blend with a GWP of 1390, has recently been proposed as a drop-in replacement for R404A and R410A in commercial systems. In this study, the heat transfer coefficient and pressure drop characteristics of R448A within a multiport mini-channel tube were experimentally investigated. The experimental ranges of the mass and heat fluxes were 100 to 500 kg/(m2s) and 3–15 kW/m2, respectively. Additionally, the range of quality from 0 to 1 was considered at two fixed saturated temperatures of 3 and 6 °C. The heat transfer coefficient increased with mass flux. Under low mass flux condition, the heat flux increased the heat transfer coefficient, but there was no noticeable effect of the saturated temperature on the heat transfer coefficient. At high mass flux, heat flux had no major effect on heat transfer, while a decrease in the saturated temperature was found to increase the heat transfer coefficient. Moreover, the pressure drop increased with an increase in the mass flux and vapor quality, whereas the heat flux did not affect the pressure drop. The heat transfer coefficient and pressure drop performance of R448A was compared with that of R410A inside the same tube. Finally, correlations for heat transfer coefficient and pressure drop were proposed for the prediction of heat transfer coefficient and pressure drop in practical applications.

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Experimental thermal and hydraulic characterization of R448A and comparison with R404A during flow boiling

Cited by 35 publications

References 40 publications

Adiabatic frictional pressure gradient during flow boiling of pure refrigerant R1233zd and non-azeotropic mixtures R448A, R452A and R455A

Adiabatic frictional pressure gradient during flow boiling of pure refrigerant R1233zd and non-azeotropic mixtures R448A, R452A and R455A

Peripheral Heat Transfer Coefficient during Flow Boiling: Comparison between 2-D and 1-D Data Reduction and Discussion about Their Applicability

Experimental Investigation of Two-Phase Flow Boiling Heat Transfer Coefficient and Pressure Drop of R448A inside Multiport Mini-Channel Tube

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