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Study Of Condensation Of Refrigerants In Micro Channels For Development Of Future Compact Micro Channel Condensers
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Book Synopsis Study of Condensation of Refrigerants in Micro-channels for Development of Future Compact Micro-channel Condensers by : Sourav Chowdhury
Download or read book Study of Condensation of Refrigerants in Micro-channels for Development of Future Compact Micro-channel Condensers written by Sourav Chowdhury and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Regime Transitions During Condensation in Microchannels by : Gaurav Nema
Download or read book Flow Regime Transitions During Condensation in Microchannels written by Gaurav Nema and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Microchannel heat exchangers are widely used in air-conditioning and refrigeration systems, high heat flux electronics cooling, and are also being considered for biological devices. Heat transfer and pressure drop in microchannels with single-phase flow have been studied in greater detail compared to two-phase flow. Heat transfer and pressure drop in two-phase flow inside tubes are closely related to the structure of the flow. In convective condensation, the fluid flows in a variety of flow regimes as it changes from vapor to liquid. The flow patterns formed in microchannels differ in type and extent from those seen in conventional tubes. Wavy and stratified flows are virtually absent at microchannel dimension, while intermittent and annular flows predominate. The subject research focuses on understanding the flow physics in microchannels during condensation. The extensive condensation flow-regime database of a previous study is employed for this purpose. This database comprises the flow-regime observations in tubes of hydraulic diameter ranging from 1-4.91 mm during condensation of refrigerant R-134a. The mass flux ranges from 150-750 kg/m2-s over a vapor quality range of 0 to 1. The results from this previous experimental study are used to understand the physical mechanisms and the governing influences for each of the identified flow regimes. Using this understanding and data, criteria for transitions between the different regimes have been developed. These criteria developed in non-dimensional form can be utilized to identify the flow regimes and transitions for various fluids, operating conditions and channel sizes, thereby generalizing the applicability of these results. This mechanistic determination of condensation flow regimes in different operating conditions and geometries will assist in the choice of the appropriate models for the evaluation of heat transfer and pressure drop, and therefore enable the development of optimum microchannel heat exchangers.
Download or read book Condensation in Microchannels written by and published by . This book was released on 1999 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design of meso-scale energy systems, either for power production or heating/cooling, will require understanding of the thermodynamics of the proposed system as well as knowledge of the heat transfer and fluid dynamic characteristics associated with flow in microchannels. These proposed thermal energy systems require the exchange of significant amounts of heat and most take advantage of the large heat transfer rates accompanying phase change. Evaporators and condensers for meso-scale energy systems will most likely be constructed of microchannels due to the microfabrication constraints that limit most structures to two-dimensional planar geometries. Thus, forced convection boiling and condensation in horizontal microchannels will provide the mechanisms for heat exchange. Unfortunately, little is known about these two processes in microchannels. No work on condensation in microchannels has yet to be reported. For single-phase and phase-change heat transfer processes, knowledge of the heat transfer rates and pressure drops in microchannels is vitally important for the future design of complete meso-scale energy systems. Thus, design tools, such as analytical and numerical models and experimental correlations, that account for microscale effects must be available to engineers as they consider complete system design. This report summarizes the first steps taken to assess convection heat transfer in horizontal microchannels.
Book Synopsis Heat Transfer and Pressure Drop During Condensation of Refrigerants in Microchannels by : Akhil Agarwal
Download or read book Heat Transfer and Pressure Drop During Condensation of Refrigerants in Microchannels written by Akhil Agarwal and published by . This book was released on 2006 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results from the current study thus make an important contribution to the understanding of pressure drop and heat transfer mechanisms during condensation in microchannels. The proposed model may be used by engineers for analyzing condensing two-phase flow in microchannels.
Book Synopsis Void Fraction, Pressure Drop, and Heat Transfer in High Pressure Condensing Flows Through Microchannels by : Brendon Louis Keinath
Download or read book Void Fraction, Pressure Drop, and Heat Transfer in High Pressure Condensing Flows Through Microchannels written by Brendon Louis Keinath and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow mechanisms affect transport processes during condensation. Most studies on two-phase flow regimes are qualitative in nature, typically providing only information to guide the identification of the respective regimes and the transitions between them. These studies have, however, not yielded quantitative information to assist the development of pressure drop and heat transfer models. Such qualitative studies have also yielded results with considerable variability between investigators. A comprehensive investigation of flow mechanisms, void fraction, pressure drop and heat transfer during condensation of R404A in microchannels was conducted. In contrast to all prior investigations, high-speed video recordings and image analyses were used to directly measure void fraction, slug frequencies, vapor bubble velocity, vapor bubble dimensions and liquid film thicknesses in tube diameters ranging from 0.508 to 3.00 mm. Experiments were conducted at reduced pressures and mass fluxes ranging from 0.38 to 0.77 and 200 to 800 kg m-2 s-1, respectively, to document their influences on the condensation process at local vapor qualities ranging from 0 to 1. This information was used to develop a model for the void fraction in condensing flows. A complementing set of heat transfer and pressure drop measurements were conducted on the same geometries at similar conditions, and the void fraction model was used in conjunction with these measurements to develop improved heat transfer and pressure drop models. This comprehensive set of experiments and analyses yields a self-consistent and accurate treatment of high-pressure condensation in small hydraulic diameter geometries. Furthermore, the heat transfer model was found to agree well with condensing ammonia and carbon dioxide data that were obtained at significantly different conditions in different tube diameters. The added physical understanding of the condensation process and the models developed will serve as important building blocks for the design of microscale condensers and thermal systems.
Book Synopsis Compact Heat Exchangers by : Alexander Louis London
Download or read book Compact Heat Exchangers written by Alexander Louis London and published by CRC Press. This book was released on 1990 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat exchangers are a crucial part of aerospace, marine, cryogenic and refrigeration technology. These essays cover such topics as complicated flow arrangements, complex extended surfaces, two-phase flow and irreversibility in heat exchangers, and single-phase heat transfer.
Book Synopsis Supercritical Gas Cooling and Near-critical-pressure Condensation of Refrigerant Blends in Microchannels by : Ulf Christian Andresen
Download or read book Supercritical Gas Cooling and Near-critical-pressure Condensation of Refrigerant Blends in Microchannels written by Ulf Christian Andresen and published by . This book was released on 2007 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical understanding and models resulting from this investigation provide the information necessary for designing and optimizing new components that utilize R410A for air-conditioning and heat pumping applications.
Book Synopsis Vehicle thermal Management Systems Conference and Exhibition (VTMS10) by : IMechE
Download or read book Vehicle thermal Management Systems Conference and Exhibition (VTMS10) written by IMechE and published by Elsevier. This book was released on 2011-05-05 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the papers presented at the IMechE and SAE International, Vehicle Thermal Management Systems Conference (VTMS10), held at the Heritage Motor Centre, Gaydon, Warwickshire, 15-19th May 2011. VTMS10 is an international conference organised by the Automobile Division and the Combustion Engines and Fuels Group of the IMechE and SAE International. The event is aimed at anyone involved with vehicle heat transfer, members of the OEM, tier one suppliers, component and software suppliers, consultants, and academics interested in all areas of thermal energy management in vehicles. This vibrant conference, the tenth VTMS, addresses the latest analytical and development tools and techniques, with sessions on: alternative powertrain, emissions, engines, heat exchange/manufacture, heating, A/C, comfort, underhood, and external/internal component flows. It covers the latest in research and technological advances in the field of heat transfer, energy management, comfort and the efficient management of all thermal systems within the vehicle. Aimed at anyone working in or involved with vehicle heat transfer Covers research and technological advances in heat transfer, energy management, comfort and efficient management of thermal systems within the vehicle
Book Synopsis Condensation Heat Transfer in Microchannel by : Billy Chin Pang Siu
Download or read book Condensation Heat Transfer in Microchannel written by Billy Chin Pang Siu and published by . This book was released on 2004 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Construction of a Condensation Heat Transfer Experimental Facility for Use with Microchannel Condenser Tubing by : David Jeffrey Andres
Download or read book Design and Construction of a Condensation Heat Transfer Experimental Facility for Use with Microchannel Condenser Tubing written by David Jeffrey Andres and published by . This book was released on 1994 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microchannel Phase Change Transport Phenomena by : Sujoy Kumar Saha
Download or read book Microchannel Phase Change Transport Phenomena written by Sujoy Kumar Saha and published by Butterworth-Heinemann. This book was released on 2015-09-27 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microchannel Heat transfer is the cooling application of high power density microchips in the CPU system, micropower systems and many other large scale thermal systems requiring effective cooling capacity. This book offers the latest research and recommended models on the microsize cooling system which not only significantly reduces the weight load, but also enhances the capability to remove much greater amount of heat than any of large scale cooling systems. A detailed reference in microchannel phase change (boiling and condensation) including recommended models and correlations for various requirements such as pressure loss, and heat transfer coefficient. Researchers, engineers, designers and students will benefit from the collated, state-of-the-art of the research put together in this book and its systematic, addressing all the relevant issues and providing a good reference for solving problems of critical analysis. Up-to-date information will help delineate further research direction in the microchannel heat transfer The latest modeling information and recommendations will help in design method and purpose
Book Synopsis Condensation in Micro-channels: Development and Testing of a New Experimental Approach Using Thermoelectric Coolers by : Rose Craft
Download or read book Condensation in Micro-channels: Development and Testing of a New Experimental Approach Using Thermoelectric Coolers written by Rose Craft and published by . This book was released on 2009 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat Transfer written by Salim Newaz Kazi and published by BoD – Books on Demand. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the wake of energy crisis due to rapid growth of industries, the efficient heat transfer could play a vital role in energy saving. Industries, household equipment, transportation, offices, etc., all are dependent on heat exchanging equipment. Considering this, the book has incorporated different chapters on heat transfer phenomena, analytical and experimental heat transfer investigations, heat transfer enhancement and applications.
Book Synopsis Laminar Flow Forced Convection in Ducts by : R. K. Shah
Download or read book Laminar Flow Forced Convection in Ducts written by R. K. Shah and published by Academic Press. This book was released on 2014-06-28 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminar Flow Forced Convection in Ducts is a sourcebook for compact heat exchanger analytical data. This book describes the analytical solutions for laminar fluid flow and forced convection heat transfer in circular and noncircular pipes, including applicable differential equations and boundary conditions involving velocity and temperature problems of fluid flow. The book also discusses fluid flow—how much power is required to pump fluids through the heat exchanger, as well as the heat transfer—the determination of q" distribution, and the temperature of fluid and walls. The text also analyzes the coolant or heat transfer fluid flows in a nuclear power reactor composed of a bundle of circular section fuel rods located inside a round tube. R.A. Axford addresses fluid flow and heat transfers results for the rod bundle geometry in "Heat Transfer in Rod Bundles." The book also provides an overview and guidelines that can be used for the designer and the applied mathematician. This book is suitable for engineers working in electronics, aerospace, instrumentation, and biomechanics that use cooling or heating exchanges or solar collection systems.
Book Synopsis Experimental and Modeling Study of Lubricant Effect on Refrigerant Distribution in Microchannel Evaporators by :
Download or read book Experimental and Modeling Study of Lubricant Effect on Refrigerant Distribution in Microchannel Evaporators written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Measurement and Visualization on the Refrigerant Distribution in the Vertical Manifold of the Microchannel Tube Heat Exchanger by : Yang Zou
Download or read book Performance Measurement and Visualization on the Refrigerant Distribution in the Vertical Manifold of the Microchannel Tube Heat Exchanger written by Yang Zou and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project studies the liquid refrigerant distribution of an intermediate vertical manifold in a multi-pass evaporator. A new test rig is designed and built to circulate R410A through the vertical microchannel manifold. Refrigerant is circulated into the manifold through the lower set of parallel microchannels and exits through the upper set. Three experimental circular manifolds were developed, each with the microchannels inserted to half depth. The first is an aluminum manifold used in industry with 5 inlet and 5 exit microchannels; the second is a transparent replica of the first; the third is a transparent manifold with 10 inlet and 10 exit microchannels used to study the effect of increasing manifold length and microchannel number. The inlet mass flow rate (min) and quality (x) are two main parameters affecting the distribution. The inlet quality was varied from 0.2 to 0.8, and the inlet mass flow rate was varied from 0.8 to 4.5 g/h per microchannel. For all three manifolds, the best distribution is generally found at high min and low x, and the worst at high x and extreme values of min. At low qualities, 0.2 and 0.4, the distribution improves with increasing mass flow rate, and at high qualities, 0.6 and 0.8, the distribution is optimum at intermediate mass flow rates, and gets worse as min increases or decreases. Likewise, for a fixed mass flow rate, the distribution generally improves as quality decreases. A comparison of the two transparent headers shows that increasing the number of microchannels in the header generally improves the distribution. The two-phase flow regimes bubbly flow, churn flow and semi-annular flow are observed through visualization results. The flow regime is dependent on min and x. At constant min, increasing the inlet quality would transition the flow regime from bubbly, to churn, and then to semi-annular flow. At a fixed intermediate inlet quality (e.g., 0.4), the flow regime would change from churn to semi-annular as min increases. The variation of liquid distribution closely follows the transition of flow regime. Based on the visualization results and force balance analysis, the liquid distribution is mainly determined by the competition between the inertial and buoyancy forces. The force balance determines where liquid goes, and further determines the distribution. Froude number is an appropriate parameter to predict the flow regime. However, it is not good enough to predict the distribution because it does not include the important effects of top pressure.
Book Synopsis Condensation and Condenser Design by : J. Taborek
Download or read book Condensation and Condenser Design written by J. Taborek and published by American Society of Mechanical Engineers. This book was released on 1993 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
