• Title/Summary/Keyword: 용접형 판형 열교환기

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Experimental study of Heat Transfer and Pressure Drop Characteristics for the Welded Plate Heat Exchanger (용접형 판형 열교환기의 열전달 및 압력강하 특성에 관한 실험적 연구)

  • Jeong, Jong-Yun;Kim, Sung-Soo;Kang, Yong-Tae
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.419-424
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    • 2008
  • Heat transfer and pressure drop characteristics of welded plate heat exchanger are studied to apply it for the solution heat exchanger of 210RT absorption system. This study quantifies the effect of mass flow rate and strong solution concentration on the heat transfer coefficient and pressure drop in the plate heat exchanger. The concentration of weak solution is fixed at 55% and the strong solution varies 55%, 57%, and 59% in mass. The results show that the overall heat transfer coefficient and pressure drop increase linearly with increasing Reynolds number. It is also found that the heat transfer coefficient of hot side increases with increasing the concentration of strong solution while the strong solution concentration has no effect on heat transfer coefficient of cold side.

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Study on Pressure Drop and Condensation Heat Transfer Characteristics of R-404A in Brazed Plate Heat Exchanger (R-404A를 사용한 용접형 판형 열교환기의 압력강하 및 응축 열전달특성에 관한 연구)

  • 권오갑;전창덕;강종식;이진호
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.3
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    • pp.174-183
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    • 2001
  • Experimental study has been carried out on the characteristics of pressure drop and heat transfer of brazed plate heat exchangers using R-404A. Data are presented for the following range of variables: the mass flux ($20~80kg/m^2s$), chevron angle($20^{circ}C,\;35^{circ}C,\;45^{circ}C$) and inlet pressure of he refrigerant (1.4 and 1.6 MPa). for both subcooled and tow-phase flow, as chevron angle increases, pressure drop and heat transfer coefficient decrease. Condensation hat transfer coefficient and pressure drop was compared with the previously proposed correlations. Among them, Traviss correlation agreed with experimental results within -35~82% for heat transfer coefficient and -73~93% for pressure drop.

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Performance Comparison of a Welded Plate Heat Exchanger and Shell and Tube Heat Exchanger with Same Heat Transfer Area (동일 전열면적을 갖는 용접식 판형열교환기와 관류형 열교환기의 성능 비교)

  • Ham, Jeonggyun;Kim, Min-Jun;An, Sungkook;Cho, Honghyun
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.15 no.4
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    • pp.46-54
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    • 2019
  • In this study, the performance of a shell and tube heat exchanger (STHE) and welded plate heat exchanger (WPHE) was measured experimentally. The pass numbers of the STHE was changed by 1, 2 and 4. As a result, the WPHE showed 2.1 times higher heat exchange capacity than that of the STHE. In case of pressure drop, the STHE with 1 and 2 pass number has a lower pressure drop than the WPHE, while the STHE with 4 pass presented higher pressure drop than the WPHE. The performance index considering the heat exchange capacity and pump consumption power, showed in oder of STHEPass1 > STHEPass2 > W PHE > STHEPass4 under the same flow rate. Therefore, when the WPHE was designed optimally under same operating condition with STHE, the maintenance fee and space can be reduced effectively by using the WPHE.

Study on Condensation Heat Transfer and Pressure Drop Characteristics of R-22 in Brazed Plate Heat Exchanger (R-22를 사용한 용접형 판형 열교환기의 응축열전달 및 압력강하 특성에 관한 연구)

  • Jeon, Chang-Deok;Gwon, O-Gap;Lee, Jin-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.2
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    • pp.171-179
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    • 2001
  • Experimental study has been carried out on the characteristics of pressure drop and heat transfer of brazed plate heat exchangers using R-22. Data are presented for the following range of variables: the mass flux (40∼90kg/$m^2$s), chevron angle ($20^{\circ}$, $35^{\circ}$, $45^{\circ}$) and inlet pressure of the refrigerant (1.4 and 1.6MPa). For both subcooled and two-phase flow, as chevron angle increases, pressure drop and heat transfer coefficient decrease. Condensation heat transfer coefficient and pressure drop were compared with the previously proposed correlations. Among therm, Traviss correlation agreed with experimental results within -40%∼-84% for heat transfer coefficient and -59%∼62% for pressure drop.

Experimental measurements of R-22 two-phase friction factor in plate heat exchangers (판형열교환기에서 R-22 냉매의 이상 압력 손실계수 평가)

  • Yoo, Sang-Roon;Jeong, Ji-Rwan
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.2273-2278
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    • 2007
  • Brazed Plate Heat Exchanger (BPHE) is a type of compact plate heat exchanger with parallel corrugated plates which are brazed together in series. Each plate hascorrugation called herringbone pattern. Inside a BPHE, hot fluid and cold fluid alternate its flow direction to establish counter current flow configuration. Two-phase flow heat transfer and pressure drop of R-22 in BPHE were experimentally measured in this study. In the present experiments, single-phase region and two-phase region coexist in a BPHE. Therefore, the inside of a BPHE have to be divided into single phase region and two phase region and analyzed accordingly. The results from the single phase flow analysis are then extended to the two phase flow analysis to correlate the condensation and evaporation heat transfer and pressure drop for the refrigerant R-22 in the BPHEs. Previous models for two- phase friction factor have been compared with the present experimental results.

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A Numerical Analysis on the Heat Transfer and Pressure Drop Characteristics of Welding Type Plate Heat Exchangers (용접형 판형열교환기의 열전달 및 압력강하특성에 관한 수치해석)

  • Jeong, Jong-Yun;Nam, Sang-Chul;Kang, Yong-Tae
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.9
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    • pp.676-682
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    • 2008
  • Numerical analysis was carried out to examine the heat transfer and pressure drop characteristics of plate heat exchangers for absorption application using Computational Fluid Dynamics(CFD) technique. A commercial CFD software package, FLUENT was used to predict the characteristics of heat transfer, pressure drop and flow distribution within plate heat exchangers. In this paper, a welded plate heat exchanger with the plate of chevron embossing type was numerically analyzed by controlling mass flow rate, solution concentration, and inlet temperatures. The working fluid is $H_2O$/LiBr solution with the LiBr concentration of 50-60% in mass. The numerical simulation shows reasonably good agreement with the experimental results. Also, the numerical results show that plate of the chevron shape gives better results than plate of the elliptical shape from the view points of heat transfer and pressure drop. These results provide a guideline to apply the welded PHE for the solution heat exchanger of absorption systems.

Heat Transfer and Pressure Drop Characteristics of Brazed Plate Heat Exchangers with Single-Phase Flow (단상유동 조건에서 용접형 판형 열교환기의 열전달 및 압력강하 특성연구)

  • Kim, Man Bae;Park, Chang Yong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.26 no.11
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    • pp.522-528
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    • 2014
  • This experimental study measured and analyzed the heat transfer and pressure drop performance of brazed plate heat exchangers. Heat exchangers with different plate numbers of 10, 20, 30, and 40 were used for measurement, and their plate pattern was identical. The experiment was performed with distilled water, by changing the hot-side flow rate, with the cold-side flow rate fixed. The experimental results were compared with the calculated values by correlations based on gasketed plate heat exchangers, and showed that the heat transfer performance and pressure drop of brazed plated heat exchangers were higher than those of gasketed plate heat exchangers. From the variation of the friction factor, it could be inferred that in the flow channels of brazed plate heat exchangers, turbulent flow occurred at Reynolds numbers higher than 500. A new correlation to predict the Nusselt number was developed, and its absolute average deviation was 2.62%, compared with the values from the experimental data.

An Experimental Study on the Performance of Brazed Plater Heat Exchangers (용접형 판형열교환기 성능측정에 관한 실험적 연구)

  • Park, Hyun-Min;Park, Chang Yong
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.3_1spc
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    • pp.551-557
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    • 2013
  • The heat transfer performance and pressure drop characteristics of brazed-plate heat exchangers with 20 and 30 plates were experimentally measured and analyzed in this study. The mass flow rates of the heat exchangers with 20 and 30 plates were fixed at 0.6 and 0.9 kg/s for the low temperature side, respectively. The mass flow rate for the high temperature side was controlled from 0.2 kg/s to 1.2 kg/s. The inlet temperatures for the high and low temperature sides were $10^{\circ}C$ and $7^{\circ}C$, respectively. The heat transfer characteristics were not influenced by the number of plates. The pressure drop at the heat exchanger with 30 plates was slightly higher than that with 20 plates. The values calculated from the correlations based on gasket plate heat exchangers were compared with the experimental results. It was found that the predicted Nusselt numbers for the gasket plate heat exchangers were about 5% to 20% lower than the measured Nusselt numbers for the brazed plate heat exchangers. However, a pressure drop comparison showed that the calculated pressure drops at the gasket plate heat exchangers were less than half of the measured pressure drops at the brazed plate heat exchangers.