Download or read book A Parametric Analysis of a Vapor Compression Refrigeration System with Mechanical Subcooling at High Condensing Temperatures written by Michael W. Larson and published by . This book was released on 1986 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thougtit that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 31 (thesis year 1986) a total of 11 ,480 theses titles trom 24 Canadian and 182 United States universities. We are sure that this broader base tor these titles reported will greatly enhance the value ot this important annual reterence work. While Volume 31 reports theses submitted in 1986, on occasion, certain univer sities do re port theses submitted in previousyears but not reported at the time.
Download or read book National Institute of Building Sciences NIBS written by United States. Congress. House. Committee on Banking, Finance, and Urban Affairs. Subcommittee on Housing and Community Development and published by . This book was released on 1984 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Assessment of Current and Prospective Credit Conditions Affecting Employment and the Prospects for the Current Economic Recovery New Haven Connecticut written by United States. Congress. House. Committee on Banking, Finance, and Urban Affairs. Subcommittee on Domestic Monetary Policy and published by . This book was released on 1984 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pressure Enthalpy Without Tears written by Eugene Silberstein and published by ESCO Press. This book was released on 2013-08-01 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enthalpy? A fancy word for heat! Over the years, much has been written on the subject of pressure enthalpy and most of it is geared toward engineers. This program presents the important concepts of pressure enthalpy in a manner that will appeal to the service technician. Each refrigerant has its own properties and these properties are compiled on the pressure enthalpy chart for that particular refrigerant. The pressure enthalpy chart enables us to create a complete picture, or "snapshot" of the entire system. With a completed pressure enthalpy plot, we can evaluate the major system components as well as calculate latent and sensible heat transfers.
Download or read book Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants written by Bahaa Morad and published by . This book was released on 2016 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This research presents detailed analyses of innovative single and two stages vapor compression refrigeration cycles (VCRCs) as well as a cold thermal energy system (CTES) for residential and commercial cooling applications. Different subcooling systems, such as dedicated mechanical subcooling (DMSC) and liquid-vapor heat exchangers (LVHX) using various refrigerants are investigated and analyzed. Results indicate that subcooling systems have great impacts on increasing the overall energetic and exergetic COPs of VCRC. The energetic and the exergetic COPs of the single stage VCRC with LVHX using R134a are 5.50 and 0.178, respectively. Whereas, for the innovative two stages VCRC with DMSC systems and R134a, energetic end exegetic COPs are found to be 5.83 and 0.189, respectively. A direct contact heat transfer CTES system using R134a-clathrate as a storage medium is investigated experimentally on a single-stage VCRC at different operating conditions. Some of the investigated operating conditions used to evaluate the storage medium behavior (clathrate) and the overall system performance are compressor speed, refrigerant mass flow rate, and different water to refrigerant mass ratios. Using R134a, it is found that at lower refrigerant mass flow rate between 0.5 to 0.8 kg/min, the clathrate is formed at longer durations, and COPs of operating cycles are found to be low compared to VCRCs. At a higher mass flow rate of 1.2 kg/min, the COPs of the CTES systems are found to be between 11.81 and 11.85, which is higher than the corresponding single stage VCRCs with LVHX by 42.5 to 44.5% and higher that the VCRC with DMSC by 41.3% to 43%. Current results show that at lower compressor speed of 2100 rpm and constant R-134a mass flow rate of 1.2 kg/sec, the COP is improved by 17%; whereas, at higher compressor speed of 2900 rpm, the COP is decreased by 23%. At higher water/R134a mass ratios in the crystallizer (storage tank), COPs are found to be decreasing due to the increase in charging times needed to form the clathrate compared to all other cases. Finally, the experimental and simulation results indicate that the CTES systems have higher COPs as compared to innovative VCRCs."--Abstract.
Download or read book Subcooling Liquid Refrigerant 12 in a Vapor Compression Refrigeration System with a Liquid vapor Heat Exchanger written by John Donald Christie and published by . This book was released on 1959 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamic Analysis for Industrial Refrigeration Systems written by John Gardner and published by Springer Nature. This book was released on 2022-05-31 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vapor compression cycle (VCC) underpins the vast majority of refrigeration systems throughout the world. Most undergraduate thermodynamics courses cover the VCC, albeit in a cursory fashion. This book is designed to offer an in-depth look at the analysis, design and operation of large-scale industrial ammonia-based refrigeration systems. An important feature of this work is a treatment of computer-aided analysis using CoolProp, an open source resource for evaluating thermodynamic properties. CoolProp can be incorporated into a large number of common computational platforms including Microsfot Excel, Python, and Matlab, all of which are covered in this book.
Download or read book Two Phase Flow in Refrigeration Systems written by Junjie Gu and published by Springer Science & Business Media. This book was released on 2013-08-17 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-Phase Flow in Refrigeration Systems presents recent developments from the authors' extensive research programs on two-phase flow in refrigeration systems. This book covers advanced mass and heat transfer and vapor compression refrigeration systems and shows how the performance of an automotive air-conditioning system is affected through results obtained experimentally and theoretically, specifically with consideration of two-phase flow and oil concentration. The book is ideal for university postgraduate students as a textbook, researchers and professors as an academic reference book, and by engineers and designers as handbook.
Download or read book Analytical and Graphical Engineering Economic Analysis as Applied to the Compression Refrigeration System and Allied Components written by George Edwin Sutton and published by . This book was released on 1957 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Refrigeration Systems and Applications written by Ibrahim Din¿er and published by John Wiley & Sons. This book was released on 2017-03-23 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive text/reference for students, researchers and practicing engineers This book provides comprehensive coverage on refrigeration systems and applications, ranging from the fundamental principles of thermodynamics to food cooling applications for a wide range of sectoral utilizations. Energy and exergy analyses as well as performance assessments through energy and exergy efficiencies and energetic and exergetic coefficients of performance are explored, and numerous analysis techniques, models, correlations and procedures are introduced with examples and case studies. There are specific sections allocated to environmental impact assessment and sustainable development studies. Also featured are discussions of important recent developments in the field, including those stemming from the author’s pioneering research. Refrigeration is a uniquely positioned multi-disciplinary field encompassing mechanical, chemical, industrial and food engineering, as well as chemistry. Its wide-ranging applications mean that the industry plays a key role in national and international economies. And it continues to be an area of active research, much of it focusing on making the technology as environmentally friendly and sustainable as possible without compromising cost efficiency and effectiveness. This substantially updated and revised edition of the classic text/reference now features two new chapters devoted to renewable-energy-based integrated refrigeration systems and environmental impact/sustainability assessment. All examples and chapter-end problems have been updated as have conversion factors and the thermophysical properties of an array of materials. Provides a solid foundation in the fundamental principles and the practical applications of refrigeration technologies Examines fundamental aspects of thermodynamics, refrigerants, as well as energy and exergy analyses and energy and exergy based performance assessment criteria and approaches Introduces environmental impact assessment methods and sustainability evaluation of refrigeration systems and applications Covers basic and advanced (and hence integrated) refrigeration cycles and systems, as well as a range of novel applications Discusses crucial industrial, technical and operational problems, as well as new performance improvement techniques and tools for better design and analysis Features clear explanations, numerous chapter-end problems and worked-out examples Refrigeration Systems and Applications, Third Edition is an indispensable working resource for researchers and practitioners in the areas of Refrigeration and Air Conditioning. It is also an ideal textbook for graduate and senior undergraduate students in mechanical, chemical, biochemical, industrial and food engineering disciplines.
Download or read book Essergy Analysis of Basic Vapor compression Refrigeration System written by Lester Shen-wei Shen and published by . This book was released on 1979 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Degradation of a Vapor compression Refrigeration System Caused by Reduced Condenser Air Flow written by Darrell H. Bultman and published by . This book was released on 1992 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reduced Condensing Pressure Operation in Industrial Ammonia Refrigeration Systems written by Marcus H. Wilcox and published by . This book was released on 1989 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer model was created using compressor and condenser performance data to simulate vapor-compression ammonia refrigeration system performance under various operating conditions and strategies. The model was used to estimate energy, demand, and cost savings resulting from reduced condensing pressures. Two ammonia refrigeration systems were selected for the investigation into reduced condensing pressure operation. Each refrigeration system was monitored under two modes of operation: high (fixed-head) and reduced (floating-head) condensing pressure. Compressor and condenser fan power, condensing pressure, and ambient dry and wet-bulb temperatures were recorded for a one week period. During the fixed-head period, the condensing pressure was maintained at 145 to 155 psig, which is typical for industry. The condenser fan controls were adjusted for the floating-head period, reducing the average condensing pressures to 117 to 130 psig. Reductions of 9.8% to 11.7% in combined compressor and condenser fan power were observed during the floating-head operation. In addition, none of the potential problems associated with floating-head operation were observed. The model was used to simulate refrigeration system performance during the monitoring periods, using weather data and estimated refrigeration loads as model input. Model predictions were compared with the monitored data to validate the model performance. The model was used to predict monthly and annual energy, peak-demand, and operating costs for a range of condensing pressures. Monthly dry and wet-bulb temperature profiles, and estimates of refrigeration loads were used as input for the model. The model predicted: Annual energy savings of 10.6% to 12.0%, corresponding to 0.63% to 0.83% savings per degree reduction in average condensing temperature. Average monthly peak demand savings of 8.7% to 9.2%, corresponding to 0.53% to 0.64% savings per degree reduction in average condensing temperature. Average annual cost savings of 10.4% to 11.9%, corresponding to 0.62% to 0.82% savings per degree reduction in average condensing temperature. The possibility of minimum condensing pressures, below which the condenser fan operating costs outweigh compressor savings. A significant portion of the possible energy savings (79% to 93%) with no additional equipment or capital cost.
Download or read book A Simple Approach to Calculate Minimize the Refrigeration Power Requirements written by Asma Etoumi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The vapor compression refrigeration cycle is the most common method used for removing heat from a lower temperature level to a higher temperature level using a mechanical work. At lower temperatures (typically lower than −40°C), complex refrigeration schemes, such as cascaded refrigeration cycles, may be needed, increasing the complexity of the models used to predict the power requirements. This chapter introduces a new linear refrigeration model to predict the shaft power demand of the refrigeration cycle given the cooling demand, the condensing, and evaporation temperatures. The refrigeration model is based on regression of rigorous simulation results. This chapter also proposes a new systematic optimization method for minimizing the work consumed in refrigeration system. The methodology employs nonlinear model to find the optimum refrigeration temperature levels and their cooling duties. To solve the nonlinear problem, generalized reduced gradient algorithm is used. A case study is presented to demonstrate the advantage using of the proposed methodology. Results show that the difference in power prediction between rigorous simulation and the new refrigeration model is about 10%. The work consumed in refrigeration cycle can be reduced to 9% compared to the base case when the operating conditions are optimized.
Download or read book Advances in Heat Pump Assisted Drying Technology written by Vasile Minea and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 7: Numerical Modeling of Heat Pump-Assisted Contact Drying -- 8: Advances in Dehumidifier Timber Drying in New Zealand -- Back Cover
Download or read book Essergy Analysis of Basic Vapor Compression Refrigeration Systems written by L. S. Shen and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
