A Uniquely Finned Tube Heat Exchanger Design of a Condenser for Heavy-Duty Air Conditioning Systems

2020 ◽  
Vol 28 (01) ◽  
pp. 2050004 ◽  
Author(s):  
Ahmad M. Abubaker ◽  
Yousef S. H. Najjar ◽  
Adnan Darwish Ahmad
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Air Conditioning ◽  
Water Pressure ◽  
Unit Length ◽  
Finned Tube ◽  
Coefficient Of Performance ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger ◽  
Air Conditioning Systems

This study introduces the design of a novel condenser for air conditioning systems. Enhancement of performance of the system was manifested by increasing the coefficient of performance (COP), decreasing the pressure drop and the power consumed by the refrigerant compressor and the cooling water pump. The design consists of an adiabatic double-pipe heat exchanger with longitudinal rectangular fins. This model can enhance heat transfer coefficient and expose more area per unit length. This novel design supersedes other conventional condenser designs by 4.7% higher COP, 8.2% lower water pressure drop, 4.68% lower compressor power. Two refrigerants have been examined in the study; R-134a which is used in commercial and industrial chillers and R-1234ze which has low global warming potential.

HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS OF AIR COOLED FINNED TUBE HEAT EXCHANGER

2017 ◽  
Author(s):  
In-Cheol Chu ◽  
Kil Won Park ◽  
Woo Jin Jeon ◽  
Hyo Seong Seol ◽  
Tae-Soon Kwon ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Finned Tube ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger

scholarly journals Numerical Investigation of Finned-tube Heat Exchanger with Circular, Elliptical & Rectangular Tubes

2020 ◽  
Vol 15 ◽  
Keyword(s):  
Heat Transfer ◽  
Water Vapor ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Finned Tube ◽  
Ansys Fluent ◽  
Tube Heat Exchanger ◽  
Circular Tubes ◽  
Finned Tube Heat Exchanger ◽  
Rectangular Tubes

A three dimensional numerical study has been conducted on finned-tube heat exchanger with multiple rows of tubes using ANSYS (Fluent). The objective of this study is to numerically investigate finned tube heat exchanger with different type of tubes such as circular, elliptical and rectangular tubes. As circular tubes has much pressure drop so elliptical and rectangular tubes has been introduced in order to reduce pressure drop. As well as heat transfer has also been examined. The finite volume based CFD code ANSYS Fluent 16.2 is used to calculate the flow and temperature fields and by applying SIMPLEC algorithm. At low velocity of air and water, nothing significant occurred for the combination of tubes. At high velocity in maximum tube combination there was heat transfer (HT) enhancement and pressure drop reduction when compared with circular tubes only in case of air. When the combinations of circular, elliptical and rectangular tubes has been compared with circular tube heat exchanger (CTHX) heat transfer reduces as well as pressure drop (PD) also reduces for air. In case of water vapor HT and PD behaves the same. When those combinations has been compared with elliptical tube HX, for air in some cases heat transfer remains same and on other case it increases. For pressure drop in case of air, in some cases it reduces and on other cases it reduces. For elliptical tube HX for the fluid water vapor HT and PD both remains same or reduces. This work has not been with conducted any numerical simulation on rectangular Heat exchanger reason behind it there isn’t any existence of this kind of heat exchanger. However, it could be numerically conducted to examine the results between those combination and rectangular heat exchanger.

Air-Side Heat Transfer and Pressure Drop Characteristics of Peripheral Fin Heat Exchangers

2010 ◽  
Author(s):  
Bruno F. Pussoli ◽  
Jader R. Barbosa ◽  
Luciana W. da Silva ◽  
Massoud Kaviany
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Thermal Conductance ◽  
Particle Diameter ◽  
Finned Tube ◽  
Open Loop ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger ◽  
Neighboring Level

We present an experimental evaluation of the peripheral finned-tube heat exchanger. In this novel compact evaporator geometry, the air-side is composed by an arrangement of open-pore cells formed by radial fins whose bases are attached to the tubes and whose tips are connected to peripheral fins. Each fin arrangement is made up of six radial fins and six peripheral fins forming a hexagon-like structure. The air-side fin configuration is composed of three levels of fin arrangement, each characterized by the length of radial fin and mounted with a 30° offset from its neighboring level. Experimental data on the air-side heat transfer and pressure drop were generated in an open-loop wind tunnel calorimeter. A one-dimensional theoretical model based on the theory of porous media has also been developed to predict the thermal-hydraulic behavior of the heat exchanger. The model incorporates the actual fin geometry into the calculation of the air-side porosity. The air-side permeability is calculated according to the Kozeny-Carman model with the particle diameter definition due to Whitaker and the friction factor correlation due to Ergun. The model overpredicts the air-side thermal conductance by less than 15% for air flow rates higher than 14 L/s. The air-side pressure drop is underpredicted by the model, but still within the limits encountered in the literature. The analysis is complemented with an entropy generation minimization analysis in order to demonstrate the procedure for obtaining an optimized configuration of the heat exchanger.

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