Study of Frost Properties Correlating With Frost Formation Types

Hayashi, Yujiro; Aoki, Ayumi; Adachi, Shinya; Hori, K.

doi:10.1115/1.3450675

Cited by 307 publications

(123 citation statements)

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“…Rite and Crawford [8] studied experimentally the effects of various parameters on the rate of frost formation on the domestic refrigerator-freezer finned tube heat exchanger coil with 5.1 mm of fin space. Hayashi [9] found that the amount of frosting gets larger at the entrance of an air flow, in agreement with the general results of other papers. Schneider [10] simulated frost height by balancing the heat transfer rate between vapor diffusivity on frost surface and thermal conductivity between frost layers of a parallel plate heat exchanger.…”

Section: Introductionsupporting

confidence: 81%

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

2012

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Abstract:The objective of this study was to provide experimental data that could be used to predict frost growth and frost performance of a round plate fin-tube heat exchanger for low temperature heat pumps used in zero emission vehicles under cold weather conditions. In this study, round plate fin-tube heat exchangers were tested with variation of the fin space, air flow rate, relative humidity, and inlet air temperature. Frost height was measured and considered with the boundary layer interruption between fins. Frost height for 8.0 mm of fin space was increased by approximately 91.9% with an increase of relative humidity from 50.0% to 80.0%. The growth rate of frost height at 1.2 m 3 /min was observed to be 13.0% greater than that at 0.8 m 3 /min. Finally, the variation of the blockage ratio with fin space would be an important reference for designing advanced heat exchangers that operate under cold weather conditions.

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Section: Introductionsupporting

confidence: 81%

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

2012

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“…This model was validated over the full range of frost surface temperature. Note that the widely used correlation of Hayashi et al [24] expresses frost density dependent on frost surface temperature only, and is known to considerably overpredict the frost density at relatively high frost surface temperatures close to the melting temperature [14].…”

Section: Frost Densitymentioning

confidence: 99%

Frost growth and densification in laminar flow over flat surfaces

Kandula

2011

International Journal of Heat and Mass Transfer

110

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One-dimensional frost growth and densification in laminar flow over flat surfaces has been theoretically investigated. Improved representations of frost density and effective thermal conductivity applicable to a wide range of frost circumstances have been incorporated. The validity of the proposed model considering heat and mass diffusion in the frost layer is tested by a comparison of the predictions with data from various investigators for frost parameters including frost thickness, frost surface temperature, frost density and heat flux. The test conditions cover a range of wall temperature, air humidity ratio, air velocity, and air temperature, and the effect of these variables on the frost parameters has been exemplified. Satisfactory agreement is achieved between the model predictions and the various test data considered. The prevailing uncertainties concerning the role air velocity and air temperature on frost development have been elucidated. It is concluded that that for flat surfaces increases in air velocity have no appreciable effect on frost thickness but contribute to significant frost densification, while increase in air temperatures results in a slight increase the frost thickness and appreciable frost densification. R universal gas constant (kJlkmol K)Ra gas constant for air (kJ/kg K)Rv gas constant for water vapor (kJ/kg K)

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“…(e.g. Mao et al (1999), Hayashi (1977), Storey and Jacobi (1999), Ostin and Andersson (1991), Yonko and Sepsi (1967)). A comprehensive review of the effect of frosting on heat exchangers is provided by Kondepudi and O'Neal (1987) who also investigated the frost growth effects on the performance of heat exchangers with flat and louvered fins.…”

Section: Introductionmentioning

confidence: 99%

Analysis of design tradeoffs for diplay case evaporators

Bullard

2004

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A model for simulating a display case evaporator under frosting conditions has been developed, using a quasi-steady and finite-volume approach and a Newton-Raphson based solution algorithm. It is capable of simulating evaporators with multiple modules having different geometries, e.g. tube and fin thicknesses and pitch.The model was validated against data taken at two-minute intervals from a wellinstrumented medium-temperature vertical display case, for two evaporators having very different configurations. The data from these experiments provided both the input data for the model and also the data to compare the modeling results.The validated model has been used to generate some general guidelines for coil design. Effects of various geometrical parameters were quantified, and compressor performance data were used to express the results in terms of total power consumption.Using these general guidelines, a new prototype evaporator was designed for the subject display case, keeping in mind the current packaging restrictions, tube and fin availabilities. It is an optimum coil for the given external load conditions. Subsequently, the validated model was used in a more extensive analysis to design prototype coils with some of the current tube and fin spacing restrictions removed.A new microchannel based suction line heat exchanger was installed in the display case system. The performance of this suction line heat exchanger is reported.iii ACKNOWLEDGEMENT

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Study of Frost Properties Correlating With Frost Formation Types

Cited by 307 publications

References 0 publications

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

Experimental Study on Frost Height of Round Plate Fin-Tube Heat Exchangers for Mobile Heat Pumps

Frost growth and densification in laminar flow over flat surfaces

Analysis of design tradeoffs for diplay case evaporators

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