scholarly journals Influence of a novel serrated wire coil insert on thermal characteristics and air flow behavior in a tubular heat exchanger

2022 ◽  
Vol 171 ◽  
pp. 107184
Author(s):  
Teerapat Chompookham ◽  
Witoon Chingtuaythong ◽  
Suriya Chokphoemphun
Keyword(s):  
Heat Exchanger ◽  
Flow Behavior ◽  
Air Flow ◽  
Thermal Characteristics ◽  
Tubular Heat Exchanger ◽  
Wire Coil

scholarly journals Thermal performance in a tubular heat exchanger with deltawinglets

2018 ◽  
Vol 192 ◽  
pp. 02062
Author(s):  
Pattarapan Tongyote ◽  
Pongjet Promvonge ◽  
Nattawoot Depaiwa ◽  
Withada Jedsadaratanachai
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Thermal Performance ◽  
Thermal Characteristics ◽  
Test Tube ◽  
Turbulent Regime ◽  
Airflow Rate ◽  
Tubular Heat Exchanger ◽  
Experimental Heat ◽  
Constant Wall Heat Flux

The paper presents an experimental heat transfer enhancement study in a tubular heat exchanger fitted with delta-winglets. The experimental work was conducted by varying the airflow rate in the test tube having a constant wall heat-flux for turbulent regime, Reynolds number (Re) from 5200 to 23,000. Effects of three pitch ratios (PR=P/D=1.5, 2.0 and 3.0) and two attack angles, α = 45° and 60°, of the winglets at a single blockage ratio (BR=b/D = 0.15) on thermal characteristics are examined. The experimental results show that the winglet-inserted tube yields, respectively, the heat transfer, friction factor and thermal performance in the form of TEF around 1.99–4.08, 4.9–14.3 times higher than the plain tube and 0.85–1.85, depending on the operating condition.

scholarly journals INTEGRATED OPTIMIZATION OF TUBULAR HEAT EXCHANGER

2020 ◽  
Vol 2018 (1) ◽  
pp. 21-27
Author(s):  
Sergey Ivanovich Kuzmin ◽  
Sergey Scherbin
Keyword(s):  
Heat Exchanger ◽  
Thermal Characteristics ◽  
Tubular Heat Exchanger ◽  
Integrated Optimization ◽  
Initial Stage ◽  
Reduced Costs

The method of analysis of the reduced costs of a tubular heat exchanger taking into account its design and thermal characteristics. The possibility and efficiency of the proposed approach for justifying the diameter and length of the pipe apparatus at the initial stage of design.

scholarly journals Comparison of heat transfer efficiency between heat pipe and tube bundles heat exchanger

2015 ◽  
Vol 19 (4) ◽  
pp. 1397-1402 ◽  
Author(s):  
Zhao-Chun Wu ◽  
Xiang-Ping Zhu
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Pipe ◽  
Thermal Characteristics ◽  
Structural Features ◽  
Transfer Efficiency ◽  
Tubular Heat Exchanger ◽  
Heat Transfer Efficiency ◽  
High Efficient ◽  
Tube Bundles

A comparison of heat transfer efficiency between the heat pipe and tube bundles heat exchanger is made based on heat transfer principle and the analysis of thermal characteristics. This paper argues that although heat pipe has the feature of high axial thermal conductivity, to those cases where this special function of heat transfer is unnecessary, heat pipe exchanger is not a high efficient heat exchanger when it is just used as a conventional heat exchanger in the industrial fields. In turn, there are some deficiencies for heat pipe exchanger, such as complicated manufacturing process, critical requirements for manufacturing materials, etc. which leads to a higher cost in comparison to a tubular heat exchanger. Nonetheless, due to its diverse structural features and extraordinary properties, heat pipe exchanger still has wide applications on special occasions.

scholarly journals INTEGRATED OPTIMIZATION OF TUBULAR HEAT EXCHANGER

2020 ◽  
Vol 2018 (1) ◽  
pp. 104-105
Author(s):  
Sergey Ivanovich Kuzmin ◽  
Sergey Scherbin
Keyword(s):  
Heat Exchanger ◽  
Thermal Characteristics ◽  
Tubular Heat Exchanger ◽  
Integrated Optimization ◽  
Technique Analysis

The technique analysis of the listed expenses of tubular heat-NIKA, given its constructive and thermal characteristics.

URBAN FACADE GEOMETRY ON OUTDOOR COMFORT CONDITIONS: A REVIEW

2020 ◽  
Vol 4 (1) ◽  
pp. 45
Author(s):  
Elahe Mirabi ◽  
Nasrollahi Nazanin
Keyword(s):  
Thermal Comfort ◽  
Urban Areas ◽  
Natural Ventilation ◽  
Flow Behavior ◽  
Air Flow ◽  
Urban Geometry ◽  
Wide Range ◽  
Low Energy Buildings ◽  
Outdoor Comfort ◽  
Solar Access

<p>Designing urban facades is considered as a major factor influencing issues<br />such as natural ventilation of buildings and urban areas, radiations in the<br />urban canyon for designing low-energy buildings, cooling demand for<br />buildings in urban area, and thermal comfort in urban streets. However, so<br />far, most studies on urban topics have been focused on flat facades<br />without details of urban layouts. Hence, the effect of urban facades with<br />details such as the balcony and corbelling on thermal comfort conditions<br />and air flow behavior are discussed in this literature review. <strong>Aim</strong>: This<br />study was carried out to investigate the effective factors of urban facades,<br />including the effects of building configuration, geometry and urban<br />canyon’s orientation. <strong>Methodology and Results</strong>: According to the results,<br />the air flow behavior is affected by a wide range of factors such as wind<br />conditions, urban geometry and wind direction. Urban façade geometry<br />can change outdoor air flow pattern, thermal comfort and solar access.<br /><strong>Conclusion, significance and impact study</strong>: In particular, the geometry of<br />the facade, such as indentation and protrusion, has a significant effect on<br />the air flow and thermal behavior in urban facades and can enhance<br />outdoor comfort conditions. Also, Alternation in façade geometry can<br />affect pedestrians' comfort and buildings energy demands.</p>

Heating a Granular Bed by a Tubular Heat Exchanger

2018 ◽  
Vol 91 (6) ◽  
pp. 1486-1495
Author(s):  
E. A. Pitsukha ◽  
Yu. S. Teplitskii ◽  
A. R. Roslik ◽  
É. K. Buchilko
Keyword(s):  
Heat Exchanger ◽  
Granular Bed ◽  
Tubular Heat Exchanger

scholarly journals Comparison of a Novel Polymeric Hollow Fiber Heat Exchanger and a Commercially Available Metal Automotive Radiator

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1175
Author(s):  
Tereza Kroulíková ◽  
Tereza Kůdelová ◽  
Erik Bartuli ◽  
Jan Vančura ◽  
Ilya Astrouski
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Hollow Fiber ◽  
Pressure Loss ◽  
Air Flow ◽  
Performance Parameters ◽  
University Of Technology ◽  
Flat Tubes ◽  
And Performance ◽  
Louvered Fins

A novel heat exchanger for automotive applications developed by the Heat Transfer and Fluid Flow Laboratory at the Brno University of Technology, Czech Republic, is compared with a conventional commercially available metal radiator. The heat transfer surface of this heat exchanger is composed of polymeric hollow fibers made from polyamide 612 by DuPont (Zytel LC6159). The cross-section of the polymeric radiator is identical to the aluminum radiator (louvered fins on flat tubes) in a Skoda Octavia and measures 720 × 480 mm. The goal of the study is to compare the functionality and performance parameters of both radiators based on the results of tests in a calibrated air wind tunnel. During testing, both heat exchangers were tested in conventional conditions used for car radiators with different air flow and coolant (50% ethylene glycol) rates. The polymeric hollow fiber heat exchanger demonstrated about 20% higher thermal performance for the same air flow. The efficiency of the polymeric radiator was in the range 80–93% and the efficiency of the aluminum radiator was in the range 64–84%. The polymeric radiator is 30% lighter than its conventional metal competitor. Both tested radiators had very similar pressure loss on the liquid side, but the polymeric radiator featured higher air pressure loss.

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