Characteristics of the Water Pressure Drop Considering Heat Transfer in the Evaporator and Condenser of a Water Chiller

Nguyễn, Minh Phú; Lee, Geun-Sik

doi:10.3795/ksme-b.2011.35.12.1293

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…literature [22]. High velocities in the upper and lower regions of a tube lead to very low pressures in these regions in the case of the greatest inclination.…”

Section: Angle Jmentioning

confidence: 98%

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

Minh

Thao

2021

CFDL

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Proper determination of inclination angle of a flat tube may increase the overall heat transfer performance without extending heat transfer surface. In this paper, the inclined flat tube heat exchanger with plain fins is numerically investigated. The influence of flat tube inclination angle and Reynolds number on the thermo-hydraulic performance index was evaluated. Tube pitch, fin spacing and flat tube size are fixed. Solving 3D computational domain with the symmetric boundary condition is used to reduce computation time. The results show that when increasing the inclination angle of the flat tube from 0 to 45°, both heat transfer and pressure loss increase because the free area of air flow decreases leading to an increase in air velocity and impingement heat transfer. The variation of inclination angle from 0 to 15°, the increase in heat transfer is stronger than the increase in the pressure loss penalty, so the performance index reaches a maximum of 0.405 at the angle of 15°. Contours of temperature, pressure and velocity at different inclination angles are presented to clarify the thermo-hydraulic characteristics of finned-tube heat exchangers using inclined flat tubes. The current work yields heat transfer enhancement ability by adjusting inclination angle of a heat transfer flat tube.

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“…literature [22]. High velocities in the upper and lower regions of a tube lead to very low pressures in these regions in the case of the greatest inclination.…”

Section: Angle Jmentioning

confidence: 98%

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

Minh

Thao

2021

CFDL

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“…One of the reasons for these problems is the burning of fossil fuels to operate thermal power plants, which emit large amounts of carbon dioxide [1,2]. In addition, CFC and HCFC refrigerants in air conditioners cause greenhouse effects and global warming [3,4]. Using renewable energy as an alternative to fossil fuels has received much attention in recent decades.…”

Section: Introductionmentioning

confidence: 99%

A Review of Energy and Exergy Analyses of a Roughened Solar Air Heater

Phu

Luân

2020

ARFMTS

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In this paper, eleven roughness elements in solar air heater duct analysed both energy and exergy were reviewed. Various roughness geometries such as ribs, twisted tap, baffles, and metal waste were surveyed about heat transfer and friction when the air flow is passing absorber plate. Evaluation criteria of roughness on the absorber plate including thermohydraulic performance parameter, thermal efficiency, effective efficiency, and exergy efficiency were presented and compared. Results showed that protruded ribs in arc shape indicated the largest Nusselt number. The ribs exhibited the highest thermohydraulic performance parameter at a Reynolds number greater than 5000. Jet impingement with arc-shaped ribs and roughness elements of metal waste were found the smallest exergy efficiencies. The biggest effective and exergy efficiencies were obtained to be 70% and 1.9%, respectively. The thermohydraulic performance parameter varied from 0.5 to 2.0. The review paper aims to provide information about roughness geometries investigated both first and second laws of thermodynamics and figure of merits to overview artificial roughness in a solar air heater.

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“…Some optimal points of condenser 있다. 냉각부하가 3000kW인 물 냉각기의 응축기, 증발기를 대상으로 하여 계 산한 결과, 관통로수가 작을수록 관의 수가 증가 할수록 Re와 ΔP가 감소함을 보고한 바 있다 (33). 여기서는 증발기와 응축기에서의 열부하에 대한 압력강하를 모델과 HTRI 소프트웨어 두 가지 방 법으로 계산결과를 비교하였을 때 오차 4% 이내 로 모델의 타당성을 입증하였다.…”

unclassified

Design Optimization of Heat Exchangers for Solar-Heating Ocean Thermal Energy Conversion (SH-OTEC) Using High-Performance Commercial Tubes

Zhou¹,

Nguyen²,

Lee³

2016

Transactions of the Korean Society of Mechanical Engineers B

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Characteristics of the Water Pressure Drop Considering Heat Transfer in the Evaporator and Condenser of a Water Chiller

Cited by 7 publications

References 10 publications

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

Thermohydraulic Performance of a Fin and Inclined Flat Tube Heat Exchanger: A Numerical Analysis

A Review of Energy and Exergy Analyses of a Roughened Solar Air Heater

Design Optimization of Heat Exchangers for Solar-Heating Ocean Thermal Energy Conversion (SH-OTEC) Using High-Performance Commercial Tubes

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