Related Papers
Novel Airside Heat Transfer Surface Designs Using an Integrated Multi-Scale Analysis with Topology and Shape Optimization
2016 •
Daniel Bacellar
The major limitation of air-to-refrigerant Heat eXchangers (HX) is the airside thermal resistance which can account for more than 90% of the overall thermal resistance. The current research on heat transfer augmentation extensively focuses on the secondary heat transfer surfaces (fins). The main reason is that the heat transfer coefficient on the primary surfaces (tubes) is usually not sufficiently high to provide a minimum thermal resistance without significantly increasing the HX size. One contributing factor is the tube size; the reduction of the hydraulic diameter significantly improves performance and compactness. Another contributing factor is the shape of the tube itself, which is generally limited to circular, oval, or flat. In this paper, we investigate three novel surface concepts, using NURBS and ellipse arcs, focusing on the airside tube shape with small flow channels aiming at the minimization or total elimination of fins. The study constitutes designing a 1.0kW air-to-...
Science and Technology for the Built Environment
Design optimization and validation of high-performance heat exchangers using approximation assisted optimization and additive manufacturing
2017 •
Daniel Bacellar
Experimental Study of a Novel Shape-Optimized Air-to-Refrigerant Heat Exchanger under Evaporator Conditions
2021 •
Yunho Hwang
WSEAS Transactions on Applied and Theoretical Mechanics
Different aspects of geometrical optimization for compact heat exchangers
2007 •
Ramin Rahmani
In this study a two dimensional, steady state and incompressible laminar flow for staggered tube arrays in crossflow is investigated numerically. The study is based on a patented (APU, UK May 2001) compact heat exchanger design using implanted vortex generators on the internal flow, and change of fluid momentum in a turbulent jet on the external flow side. A finite-volume method is used to discretize and solve the governing equations for the geometries expressed by a boundary-fitted coordinate system. Solutions for the Reynolds numbers from 20 to 200 are obtained for a tube bundle with 10 longitudinal rows in different tube arrangements of ES, ET, and RS each with nominal pitch-to-diameter ratios of 1.33, 1.60 and 2.00. Different performance parameters which are used commonly to compare different heat exchangers are investigated and the performance parameters which account for pressure losses as well as occupied area are defined. The variations of these parameters with inlet Reynolds number and different nominal pitch-to-diameter ratios for different tube arrangements are also indicated. The optimum tube layouts for the studied flow and geometry ranges are shown as well.
International Journal of Heat and Mass Transfer
Compact heat exchangers – Design and optimization with CFD
2020 •
Dr Chamil Abeykoon
Applied Thermal Engineering
Multi-stage thermal-economical optimization of compact heat exchangers: A new evolutionary-based design approach for real-world problems
2015 •
Moslem Yousefi, Milad Yousefi
Advanced Heat Exchanger Technology for Aerospace Applications
Arun Muley
Thermal management requirements for aerospace applications continue to grow while weight and volume allotments remain constant or shrink. Compact, high performance and lightweight heat transfer equipment is needed to meet these high heat flux removal requirements. Several innovative heat transfer enhancement techniques are being considered for development of thermal management components that will meet these challenging demands. Honeywell, under an AFRL funded program, is developing two new heat exchanger technologies; microchannel and advanced heat transfer surfaces to improve thermal management systems for a fuel-to-air heat exchanger. Heat transfer systems in military aircraft are increasingly using fuel as a heat sink. Heat transport loops containing several fuel-to-liquid heat exchangers are used to cool electronics, engine oil, hydraulic oil, and elements of the thermal management system. Microchannel heat exchangers are especially suitable for these and other high heat flux removal applications due to their good thermal performance and extremely compact size. Traditionally, they have been used for thermal management of microelectronic devices. Recently, Honeywell conducted heat exchanger design trade studies, which highlights potential benefits of microchannels. The results from this study suggest that for liquid-air heat exchange applications, microchannel based metallic heat exchangers can offer potential 20- 30% volume and/or weight reduction over state-of-theart compact plate-fin design. In the present study, use of microchannel and advanced heat transfer surfaces for a fuel-to-air compact heat exchanger for a fighter aircraft application is explored. Preliminary results from heat exchanger performance tradeoff and testing of prototype /subscale microchannels heat exchangers are reported. Finally, future development needs are summarized for their successful insertion for full-scale production.
Heat Exchangers - Advanced Features and Applications
Heat Exchangers in the Aviation Engineering
2017 •
Antonio Carozza
A-Type Heat Exchanger Simulation Using 2-D CFD for Airside Heat Transfer and Pressure Drop
2008 •
Omar AbdElaziz
Validation of a Smooth Configuration Surface for Compact Heat Exchangers for energy efficiency using a numerical method
Ruben Borrajo
This work determines the thermo hydraulics behavior of smooth configuration surface for a compact heat exchanger by means of numerical simulation. The objective is to use the results as baseline for research in the enhancement of heat transfer and drag reduction, directed to reduce the energy consumption and diminish the environmental impact. The fin tube heat exchanger model is described. The constraints used in the implementation of the equation solver are announced. The average heat transfer coefficient and pressure drop obtained from numerical simulation are compare to experimental results presented in literature for models with the same dimensions and configuration. A good agreement between numerical and experimental results is reached. Local mechanisms responsible for the heat transfer and pressure drop are detailed. The study is conducted inside the laminar regime for frontal velocities ranging between 0.5 and 6 m/s.
