scholarly journals Stainless steel finned tube heat exchanger design for waste heat recovery

2006 ◽  
Vol 17 (2) ◽  
pp. 47-56 ◽  
Author(s):  
KPM Wipplinger ◽  
TM Harms ◽  
AB Taylor
Keyword(s):  
Energy Source ◽  
Stainless Steel ◽  
Heat Exchanger ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Finned Tube ◽  
Engineering Industry ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger

Around the world the implementation of heat recovery systems play an increasingly important role in the engineering industry. Recovered energy is utilised in production plants (especially in the food industry) and saves companies millions in expenses per year. Waste heat recovery associated with hydrocarbon combustion in the transport industry is identified as a significantly under-utilised energy resource. The aim of this project was to investigate the recovery of waste heat in a small scale system for the purpose of electrical conversion in order to serve as a secondary energy source. A theoretical analysis concerning the design and construction of the system, utilising researched theory and a control-volume-based simulation program of the recovery system, is presented. It was found that heat exchangers for the required duty are not readily available in South Africa. A high pressure, cross flow, stainless steel finned tube heat exchanger with a water side pressure rating of 2 MPa was therefore designed and constructed. By using the exhaust gases of a continuous combustion unit as an energy source and water as the working fluid, efficiencies of up to 74% in direct steam generation testing were obtained.

Rack-Level Thermosyphon Cooling and Vapor-Compression Driven Heat Recovery: Evaporator Model

2021 ◽  
Author(s):  
Rehan Khalid ◽  
Raffaele Luca Amalfi ◽  
Aaron P. Wemhoff
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Recovery ◽  
Waste Heat ◽  
Cooling System ◽  
Operating Conditions ◽  
Staggered Grid ◽  
Outlet Temperature ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger

Abstract An in-rack cooling system connected to an external vapor recompression loop can be an economical solution to harness waste heat recovery in data centers. Validated subsystem-level models of the thermosyphon cooling and recompression loops (evaporator, heat exchangers, compressor, etc.) are needed to predict overall system performance and to perform design optimization based on the operating conditions. This paper specifically focuses on the model of the evaporator, which is a finned-tube heat exchanger incorporated in a thermosyphon cooling loop. The fin-pack is divided into individual segments to analyze the refrigerant and air side heat transfer characteristics. Refrigerant flow in the tubes is modeled as 1-D flow scheme with transport equations solved on a staggered grid. The air side is modeled using differential equations to represent the air temperature and humidity ratio and to predict if moisture removal will occur, in which case the airside heat transfer coefficient is suitably reduced. The louver fins are modeled as individual hexagons and are treated in conjunction with the tube walls. A segment-by-segment approach is utilized for each tube and the heat exchanger geometry is subsequently evaluated from one end to the other, with air property changes considered for each subsequent row of tubes. Model predictions of stream outlet temperature and pressure, refrigerant outlet vapor quality and heat exchanger duty show good agreement when compared against a commercial software.

scholarly journals Mechanical Engg Dept. National Institute of Technology;Silchar, Silchar, India

2011 ◽  
pp. 77-83
Author(s):  
Apu Roy ◽  
D.H.Das Das
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Waste Heat ◽  
Finned Tube ◽  
Heat Transfer Fluid ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger ◽  
Institute Of Technology ◽  
Experimental Values ◽  
Energy Conversion Devices

The energy available in the exit stream of many energy conversion devices such as I.C engine gas turbine etc goes as waste, if not utilized properly. The present work has been carried out with a view to predicting the performance of a shell and finned tube heat exchanger in the light of waste heat recovery application. The performance of the heat exchanger has been evaluated by using the CFD package fluent 6.3.16 and has been compared with the available experimental values. An attempt has also been made to predict the performance of the above heat exchanger by considering different heat transfer fluid and the result so obtained have been compared. The performance parameters pertaining to heat exchanger such as effectiveness, overall heat transfer coefficient, energy extraction rate etc, have been reported in this work.

EXPERIMENTAL INVESTIGATION OF HEAT PIPE HEAT EXCHANGER (HPHE) FOR WASTE HEAT RECOVERY APPLICATION

2019 ◽  
Author(s):  
Sakil Hossen ◽  
AKM M. Morshed ◽  
Amitav Tikadar ◽  
Azzam S. Salman ◽  
Titan C. Paul
Keyword(s):  
Experimental Investigation ◽  
Heat Exchanger ◽  
Heat Pipe ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Pipe Heat
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