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Investigation Of Thermal-Hydraulic Characteristics Of Pillow Plate Heat Exchangers Using Cfd, Radia Eldeeb, Vikrant Aute, Reinhard Radermacher
Investigation Of Thermal-Hydraulic Characteristics Of Pillow Plate Heat Exchangers Using Cfd, Radia Eldeeb, Vikrant Aute, Reinhard Radermacher
International Refrigeration and Air Conditioning Conference
The compactness and desirable thermal characteristics of plate heat exchangers have made them a strong competing heat exchanger technology in the heating, ventilating, air conditioning and refrigeration industry. The miniaturization of plate heat exchangers has become a focal point of attention in recent research. It is desirable to utilize less material and refrigerant charge to obtain the same heat transfer performance. Pillow plate heat exchangers (PPHEs) consist of wavy plates that are welded together with a certain pattern using spot welding, sealed at the edges, and then inflated in a hydroforming process. The complex wavy structure of the pillow plates …
Wavy Fin Profile Optimization Using Nurbs For Air-To-Refrigerant Tube-Fin Heat Exchangers With Small Diameter Tubes, Daniel Bacellar, Vikrant Aute, Reinhard Radermacher
Wavy Fin Profile Optimization Using Nurbs For Air-To-Refrigerant Tube-Fin Heat Exchangers With Small Diameter Tubes, Daniel Bacellar, Vikrant Aute, Reinhard Radermacher
International Refrigeration and Air Conditioning Conference
The major limitation of any air-to-refrigerant HX is the air side thermal resistance which can account for 90%, or more, of the overall thermal resistance. For this reason the secondary heat transfer surfaces (fins) play a major role in these HX’s by providing additional surface area. Many researchers extensively investigate how to improve the performance of fins. The most common passive heat transfer augmentation method applied to fins uses surface discontinuity; providing an efficient disruption-reattachment mechanism of the boundary layer. Such approach is leveraged by louvers, slits and even vortex generators. In some applications, however, these concepts are not adequate …