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Author: Govinda Mahajan
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
The development and implementation of technologies that improves Heating Ventilation & Air Conditioning (HVAC) system efficiency, including unique waste heat recovery methods, are sought while considering financial constraints and benefits. Recent studies have found that through the use of advanced waste heat recovery systems, it is possible to reduce building’s energy consumption by 30%. Oscillating heat pipes (OHP) exists as a serpentine-arranged capillary tube, possesses a desirable aerodynamic form factor, and provides for relatively high heat transfer rates via cyclic evaporation and condensation of an encapsulated working fluid with no internal wicking structure required. In last two decades, it has been extensively investigated for its potential application in thermal management of electronic devices. This dissertation focuses on the application of OHP in waste heat recovery systems. To achieve the goal, first a feasibility study is conducted by experimentally assessing a nine turn copper-made bare tube OHP in a typical HVAC ducting system with adjacent air streams at different temperatures. Second, for a prescribed temperature difference and volumetric flow rate of air, a multi-row finned OHP based Heat Recovery Ventilator (OHP-HRV) is designed and analyzed for the task of pre-conditioning the intake air. Additionally, the energy and cost savings analysis is performed specifically for the designed OHP-HRV system and potential cost benefits are demonstrated for various geographical regions within the United States. Finally, an atypically long finned OHP is experimentally investigated (F-OHP) under above prescribed operating condition. Helical fins are added to capillary size OHP tubes at a rate of 12 fins per inch (12 FPI), thereby increasing the heat transfer area by 433%. The coupled effect of fins and oscillation on the thermal performance of F-OHP is examined. Also, F-OHP’s thermal performance is compared with that of bare tube OHP of similar dimension and operating under similar condition. It was determined that OHP can be an effective waste heat recovery device in terms of operational cost, manufacturability, thermal and aerodynamic performance. Moreover, it was also determined that OHP-HRV can significantly reduce energy consumption of a commercial building, especially in the winter operation.
Author: Govinda Mahajan
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
The development and implementation of technologies that improves Heating Ventilation & Air Conditioning (HVAC) system efficiency, including unique waste heat recovery methods, are sought while considering financial constraints and benefits. Recent studies have found that through the use of advanced waste heat recovery systems, it is possible to reduce building’s energy consumption by 30%. Oscillating heat pipes (OHP) exists as a serpentine-arranged capillary tube, possesses a desirable aerodynamic form factor, and provides for relatively high heat transfer rates via cyclic evaporation and condensation of an encapsulated working fluid with no internal wicking structure required. In last two decades, it has been extensively investigated for its potential application in thermal management of electronic devices. This dissertation focuses on the application of OHP in waste heat recovery systems. To achieve the goal, first a feasibility study is conducted by experimentally assessing a nine turn copper-made bare tube OHP in a typical HVAC ducting system with adjacent air streams at different temperatures. Second, for a prescribed temperature difference and volumetric flow rate of air, a multi-row finned OHP based Heat Recovery Ventilator (OHP-HRV) is designed and analyzed for the task of pre-conditioning the intake air. Additionally, the energy and cost savings analysis is performed specifically for the designed OHP-HRV system and potential cost benefits are demonstrated for various geographical regions within the United States. Finally, an atypically long finned OHP is experimentally investigated (F-OHP) under above prescribed operating condition. Helical fins are added to capillary size OHP tubes at a rate of 12 fins per inch (12 FPI), thereby increasing the heat transfer area by 433%. The coupled effect of fins and oscillation on the thermal performance of F-OHP is examined. Also, F-OHP’s thermal performance is compared with that of bare tube OHP of similar dimension and operating under similar condition. It was determined that OHP can be an effective waste heat recovery device in terms of operational cost, manufacturability, thermal and aerodynamic performance. Moreover, it was also determined that OHP-HRV can significantly reduce energy consumption of a commercial building, especially in the winter operation.
Author: Hongbin Ma
Publisher: Springer
ISBN: 1493925040
Category : Science
Languages : en
Pages : 441
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Book Description
This book presents the fundamental fluid flow and heat transfer principles occurring in oscillating heat pipes and also provides updated developments and recent innovations in research and applications of heat pipes. Starting with fundamental presentation of heat pipes, the focus is on oscillating motions and its heat transfer enhancement in a two-phase heat transfer system. The book covers thermodynamic analysis, interfacial phenomenon, thin film evaporation, theoretical models of oscillating motion and heat transfer of single phase and two-phase flows, primary factors affecting oscillating motions and heat transfer, neutron imaging study of oscillating motions in an oscillating heat pipes, and nanofluid’s effect on the heat transfer performance in oscillating heat pipes. The importance of thermally-excited oscillating motion combined with phase change heat transfer to a wide variety of applications is emphasized. This book is an essential resource and learning tool for senior undergraduate, graduate students, practicing engineers, researchers, and scientists working in the area of heat pipes. This book also · Includes detailed descriptions on how an oscillating heat pipe is fabricated, tested, and utilized · Covers fundamentals of oscillating flow and heat transfer in an oscillating heat pipe · Provides general presentation of conventional heat pipes
Author:
Publisher:
ISBN:
Category : Heat pipes
Languages : en
Pages : 286
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Book Description
Author: Mustafa Nezih Kaya
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
In this research, we quantify the parametric effects (number of turns, inclination angle, and filling ratio) on different designs of closed loop oscillating heat pipes (CLOHPs). Experiments were conducted on a CLOHP. Tubes were heated and cooled by constant temperature in wind tunnels, and n-pentane was used as the working fluid. The effects of number of turns were investigated to prove the less gravity effect when the number of turns increases. Inclination angle effects were investigated to verify inclination angle decreases the affects of gravitational force. Tubes were charged to 0 and to 70 percent of total volume of tubes with n-pentane to demonstrate optimum heat transfer between condenser and evaporation sections. The importance of this work is in presenting design parameters to obtain lower energy consumption compare with previous known designs. Results indicate that 9 turns, 90-degree inclination angle, and charging 70 percent are the most effective design parameters.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
In this research, we quantify the parametric effects (number of turns, inclination angle, and filling ratio) on different designs of closed loop oscillating heat pipes (CLOHPs). Experiments were conducted on a CLOHP, which is made of copper tube with 1.65-mm inner diameter. Tubes are heated and cooled by constant temperature in wind tunnels, and n-pentane was used as the working fluid. The numbers of turns used were 5, 7, and 9. The effects of number of turns were investigated in order to prove the less gravity effect when the number of turns increases. Inclination angles used were 75, 82.5, and 90-degree. Inclination angle effects were investigated to verify that inclination angle decreases the affects of gravitational force. The tubes were charged to 0 and to 70 percent of total volume of tubes with n-pentane to demonstrate optimum heat transfer between condenser and evaporation sections. The importance of this work is in presenting design parameters to obtain lower energy consumption in comparison to previous known designs. Results indicate that 9 turns, 90-degree inclination angle, and charging 70 percent n-pentane of tubes were the most effective design parameters.
Author: David Reay
Publisher: Butterworth-Heinemann
ISBN: 0080982794
Category : Technology & Engineering
Languages : en
Pages : 280
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Book Description
Heat Pipes, Sixth Edition, takes a highly practical approach to the design and selection of heat pipes, making it an essential guide for practicing engineers and an ideal text for postgraduate students.This new edition has been revised to include new information on the underlying theory of heat pipes and heat transfer, and features fully updated applications, new data sections, and updated chapters on design and electronics cooling. The book is a useful reference for those with experience and an accessible introduction for those approaching the topic for the first time. Contains all information required to design and manufacture a heat pipe Suitable for use as a professional reference and graduate text Revised with greater coverage of key electronic cooling applications
Author: Pranab Barua
Publisher: LAP Lambert Academic Publishing
ISBN: 9783843364812
Category :
Languages : en
Pages : 184
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Book Description
Heat pipe heat exchangers are very effective devices for waste heat recovery. To check for its efficiency, we must study the manner in which it helps to remove heat from a system concerned. The higher the heat removal rate, the more efficiently it can recover heat that would otherwise get wasted. In our work, it was chosen to establish mathematical models of fall of temperature with respect to time in the condenser section of pulsating heat pipes due to natural cooling from a certain higher temperature to the room temperature for various diameters of pipes made of copper and for various lengths of the evaporator section using water as the working fluid. We have found that temperature decreases exponentially in time both for single loop and for multiple loops. For a fixed length of the evaporator section, we have seen that temperature falls faster for smaller diameter of the pipe. The rate of change of temperature has been seen to rise with increase in the number of turns in the evaporator section. We have found further that the instantaneous failure rate of falling temperature rises exponentially with increase in the number of turns in the evaporator section.
Author: Alex Meyer
Publisher:
ISBN:
Category : Heat exchangers
Languages : en
Pages :
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Book Description
Author: Amir Faghri
Publisher: Global Digital Press
ISBN: 1560323833
Category : Science
Languages : en
Pages : 32
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Book Description
Presents basic and advanced techniques in the analytical and numerical modeling of various heat pipe systems under a variety of operating conditions and limitations. It describes the variety of complex and coupled processes of heat and mass transfer in heat pipes. The book consists of fourteen chapters, two appendices, and over 400 illustrations, along with numerous references and a wide variety of technical data on heat pipes.
Author: D. A. Reay
Publisher: Elsevier
ISBN: 1483157024
Category : Technology & Engineering
Languages : en
Pages : 831
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Book Description
Advances in Heat Pipe Technology covers the proceedings of the Fourth International Heat Pipe Conference, held at the Royal Aeronautical Society in London, United Kingdom on September 7-10, 1981. This conference focuses on the advances in heat pipe and thermosyphon technology. This book is organized into seven parts encompassing 69 chapters. The first part describes the design and features of heat pipes, as well as their terrestrial and spacecraft applications. The subsequent parts deal with the performance, heat transfer and hydrodynamic properties, and entrainment of thermosyphon and heat pipes, with an emphasis on their application to energy conservation. The last parts discuss the heat pipe theory, and the experimental techniques and life tests of heat pipes.
