The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
D.b. Turkington - One of the best experts on this subject based on the ideXlab platform.
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An analysis of solar heating systems that use Vapor-Compression cycles
Solar Energy, 2003Co-Authors: M. Suzuki, Michael D. Devine, Hillel Kumin, D.b. TurkingtonAbstract:Abstract This paper analyzes the technical and economic performance of solar heating systems that use Vapor-Compression cycles, circulating a compressible fluid as the working fluid. With conventional solar heating systems that use water or as their working fluid, the collector inlet temperature is equal to that of the storage outlet temperature. Operating the system on a cold day can result in large thermal losses to the surroundings and, thus, low useful heat gains. A Vapor-Compression cycle may be attractive because it allows the collector inlet temperature to be lowered so that the heat gain of the collector can be increased. Such a system is simulated and a preliminary economic analysis performed. The results indicate that the Vapor-Compression system can collect almost 50% more solar energy than a conventional system if the collector area of the two systems are the same.
M. Suzuki - One of the best experts on this subject based on the ideXlab platform.
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An analysis of solar heating systems that use Vapor-Compression cycles
Solar Energy, 2003Co-Authors: M. Suzuki, Michael D. Devine, Hillel Kumin, D.b. TurkingtonAbstract:Abstract This paper analyzes the technical and economic performance of solar heating systems that use Vapor-Compression cycles, circulating a compressible fluid as the working fluid. With conventional solar heating systems that use water or as their working fluid, the collector inlet temperature is equal to that of the storage outlet temperature. Operating the system on a cold day can result in large thermal losses to the surroundings and, thus, low useful heat gains. A Vapor-Compression cycle may be attractive because it allows the collector inlet temperature to be lowered so that the heat gain of the collector can be increased. Such a system is simulated and a preliminary economic analysis performed. The results indicate that the Vapor-Compression system can collect almost 50% more solar energy than a conventional system if the collector area of the two systems are the same.
Mark T Holtzaple - One of the best experts on this subject based on the ideXlab platform.
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Performance Evaluation of An Innovative-Vapor- Compression-Desalination System
Aceh International Journal of Science and Technology, 2012Co-Authors: Mirna R. Lubis, Mark T HoltzapleAbstract:Abstract – Two dominant desalination methods are reverse osmosis (RO) and multi-stage flash (MSF). RO requires large capital investment and maintenance, whereas MSF is too energy-intensive. Innovative system of Vapor Compression desalination is proposed in this study. Comprehensive mathematics model for eVaporator is also described. From literature study, it is indicated that very high overall-heat-transfer coefficient for eVaporator can be obtained at specific condition by using dropwise condensation in the steam side, and pool boiling in the liquid side. Smooth titanium surface is selected in order to increase dropwise condensation, and resist corrosion. To maximize energy efficiency, a cogeneration scheme of a combined cycle consisting of gas turbine, boiler heat recovery, and steam turbine that drives compressor is used. The resource for combined cycle is relatively too high for the compressor requirement. Excess power can be used to generate electricity for internal and/or external consumptions, and sold to open market. Four eVaporator stages are used. EVaporator is fed by seawater, with assumption of 3.5% salt contents. Boiling brine (7% salt) is boiled in low pressure side of the heat exchanger, and condensed Vapor is condensed in high pressure side of the heat exchanger. Condensed steam flows at velocity of 1.52 m/s, so that it maximize the heat transfer coefficient. This unit is designed in order to produce 10 million gallon/day, and assumed it is financed with 5%, 30 years of passive obligation. Three cases are evaluated in order to determine recommended condition to obtain the lowest fixed capital investment. Based on the evaluation, it is possible to establish four-stage unit of mechanical Vapor Compression distillation with capital $31,723,885. Keywords: Desalination, dropwise condensation, heat exchanger, StarRotor compressor, Vapor Compression distillation.
Reinhard Radermacher - One of the best experts on this subject based on the ideXlab platform.
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Recent advances in Vapor Compression cycle technologies.
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: Chasik Park, Hoseong Lee, Yunho Hwang, Reinhard RadermacherAbstract:This paper comprehensively reviews the recent studies on advanced Vapor Compression cycle technologies. These technologies are categorized in three groups: subcooling cycles, expansion loss recovery cycles, and multi-stage cycles. The subcooling cycle research is focused on a suction-line heat exchanger, thermoelectric subcooler and mechanical subcooler. The expansion loss recovery cycles are mainly focused on utilizing an expander and ejector. The multi-stage cycle research includes a Vapor or liquid refrigerant injection cycle, two-phase refrigerant injection cycle. All these advanced Vapor Compression cycle technology options are reviewed, and their effects are discussed. In recent years, the research and development have been made to improve the performance of the VCC. This paper presents the improved cycle options and their comprehensive review. From the review results, several future research needs were suggested.
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Component-Based Vapor Compression Simulation Tool with Integrated Multi- Objective Optimization Routines
2011Co-Authors: Jonathan Winkler, Vikrant Aute, Reinhard RadermacherAbstract:A component-based simulation tool for modeling the steady state performance and cost of Vapor Compression systems has been developed. Features of the simulation software include component inter-changeability, charge management, and built-in multi-objective optimization routines. The simulation tool is capable of optimizing for a variety of performance or economic variables by varying any component or system level independent property. Example component level independent properties include heat exchanger tube length, air flow rate, and fins per inch and example system level independent properties include system subcooling and system superheat. This paper presents the use of multi-objective optimization, specifically multi-objective genetic algorithms, to optimize the performance and cost of an experimental Vapor Compression system. The simulation tool utilizes a class interface Component Standard allowing for system-to-component communication. This paper also discusses the purpose and requirement for such a standard in any component-based simulation software while using a Vapor Compression system as an example.
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comprehensive investigation of numerical methods in simulating a steady state Vapor Compression system
International Journal of Refrigeration-revue Internationale Du Froid, 2008Co-Authors: Jonathan Winkler, Vikrant Aute, Reinhard RadermacherAbstract:Computer simulation has become a required tool in the design phase of Vapor Compression systems; however with relatively few exceptions most simulations focus on the basic four component systems. With an increasing focus being placed on energy efficiency, the simulation of multi-component Vapor Compression systems (having multiple eVaporators, condenser or compressors) will become essential to assist in the design of these more complicated systems. The implementation of a component-based framework will facilitate the simulation of multi-component systems. This paper describes three algorithms used to simulate a component-based Vapor Compression system. A test matrix of 6174 sample runs covering a wide range of operating conditions was constructed to determine the robustness and speed of each method when using three different types of nonlinear equation solvers. Each method was tested by simulating a basic four component cycle and a more advanced multiple eVaporator system. The results are presented in such a format as to describe the reasons that contribute to any instability of the solvers and the computational efficiency of each method is discussed.
Michael D. Devine - One of the best experts on this subject based on the ideXlab platform.
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An analysis of solar heating systems that use Vapor-Compression cycles
Solar Energy, 2003Co-Authors: M. Suzuki, Michael D. Devine, Hillel Kumin, D.b. TurkingtonAbstract:Abstract This paper analyzes the technical and economic performance of solar heating systems that use Vapor-Compression cycles, circulating a compressible fluid as the working fluid. With conventional solar heating systems that use water or as their working fluid, the collector inlet temperature is equal to that of the storage outlet temperature. Operating the system on a cold day can result in large thermal losses to the surroundings and, thus, low useful heat gains. A Vapor-Compression cycle may be attractive because it allows the collector inlet temperature to be lowered so that the heat gain of the collector can be increased. Such a system is simulated and a preliminary economic analysis performed. The results indicate that the Vapor-Compression system can collect almost 50% more solar energy than a conventional system if the collector area of the two systems are the same.
