Heat transfer characteristics of flat plate finned-tube heat exchangers with large fin pitch

Kim, Yong-Han; Kim, Yongchan

doi:10.1016/j.ijrefrig.2005.01.013

Cited by 86 publications

(26 citation statements)

References 9 publications

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“…To enhance the heat transfer coefficient of the tested heat exchanger, the boundary layer interruption between the fins should be prevented and the developed boundary layer along the fins between the tubes should be broken as mentioned by Lee [22]. Also, the boundary layer thickness increases with the increase of the plate length, resulting in the decrease of the heat transfer coefficient as mentioned by Kim and Kim [23]. Leading edge of the boundary layer formation in the round plate fin was changed along the contour of the round plate fin as shown in Figure 3(b).…”

Section: Boundary Layermentioning

confidence: 99%

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: Boundary Layermentioning

confidence: 99%

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

2012

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“…It has been estimated that it may exceed 10 times the value of heat transfer coefficient [12]. However, the number of tubes has a negligible effect on the efficiency of the heat exchanger [13], but important issue is the distance between the cross located ribs in the heat exchanger, which should be increased [14]. However, a properly selected system affects not only the heat transfer process with the ambient, but also the efficiency of the refrigerators.…”

Section: Introductionmentioning

confidence: 99%

Free convection on a refrigerator’s condenser

Orzechowski

Stokowiec

2014

EPJ Web of Conferences

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Abstract. The paper presents the measurement of heat transfer coefficient for the refrigerator's condenser in free convection regime. The water was pumped through the steel coils of heat exchanger with a constant flow rate and its temperature was kept at a demanded value by means of ultrathermostat. The research was conducted in stationary conditions which were controlled by a continuous measurement of the water temperature at inflow and outflow to the heat exchanger. The temperature distribution at the external condenser surface was registered by means of an infrared camera. Single elements used to the analysis were selected using the thermogram registered. In free convection regime and in case of small temperature change the heat transfer coefficient value can be calculated by comparing the measured temperature area with analytical solution describing one-dimensional temperature distribution along the rib. The accuracy of the proposed method for measuring the heat transfer coefficient was examined by comparing the heat transferred to the air and the heat lost by water flowing through the spiral of heat exchanger. An error between these two parameters is about 6%.

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“…In these investigations, they determined the optimum design factors of the heat exchanger by comparing the high thermal efficiency, the low pressure loss, the best flow rate and the working temperatures with the actual design data. Experiments by Kim and Kim (2005) have shown that the optimum flat plate finned tube heat exchangers have been tested on the wing slopes in their design and have tested different wing pitches, number of tubes and pipe alignment of twenty two heat exchangers. As a result of the studies, they reached the finding that they provided 10% more efficiency without bringing the pipes in a stepped form.…”

Section: Introductionmentioning

confidence: 99%

Parameters Affecting the Performance of a Plate Heat Exchanger using the CFD

Aydın¹,

Güler²,

Keçebaş³

2017

Energy Research Journal

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A plate heat exchanger is a type of heat exchangers that provides more surface area for heat transfer between two fluids. Plate heat exchangers are widely used for heat transfer applications in the industry. In addition, they are now widely used in many applications such as food processing, chemical reaction processes, heating and cooling applications in sectors such as petroleum. However, the design of plate heat exchangers is complicated by the large number of variables and geometries that affect its performance. A better heat exchanger design is to achieve a high heat transfer rate at low pumping power with low cost. In this study, the focus is on the research and development efforts of different plate materials, various fluid types, their flow regimes and the plate grooving angles on plate heat exchanger performance. For this purpose, the Computational Fluid Dynamics (CFD) is used. The results show that the heat efficiency is the best performing heat exchanger that can be designed as parallel-and counter-flow, geothermal fluid, titanium plate and 60° groove angle from the point of view.

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Heat transfer characteristics of flat plate finned-tube heat exchangers with large fin pitch

Cited by 86 publications

References 9 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

Free convection on a refrigerator’s condenser

Parameters Affecting the Performance of a Plate Heat Exchanger using the CFD

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