The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
E E Anyanwu - One of the best experts on this subject based on the ideXlab platform.
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review of solid adsorption Solar Refrigeration ii an overview of the principles and theory
Energy Conversion and Management, 2004Co-Authors: E E AnyanwuAbstract:Abstract A review of the basic principles and theories of solid adsorption Solar Refrigeration is presented. The cycle performance thermodynamics is also reviewed, and the criteria for selection of adsorbent/adsorbent pairs are reported. The practically realised Solar adsorption cooling systems were categorized by their adsorbate operating pressure ranges as low and high pressure systems, and their pertinent design features are given. Adsorption equilibrium models that account for the adsorption properties of a pair of adsorbent/adsorbate and act as state equations in analytical models of the machine are reported.
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review of solid adsorption Solar refrigerator i an overview of the Refrigeration cycle
Energy Conversion and Management, 2003Co-Authors: E E AnyanwuAbstract:A review of the practically realized solid adsorption Solar Refrigeration cycles is presented. The cycles also have potentials for use as heat pumps. They have been classified according to the adsorbate utilized as: cycles with water as refrigerant, cycles using fluorocarbon as refrigerant, cycles using ammonia as refrigerant and cycles with alcohols as refrigerant. The performances of these Refrigeration cycles, drawn from experiences worldwide, are also reported. The actual field testing experiences, together with the technical and economic constraints that affect popularization of the systems are reviewed, and their possible solutions are suggested.
C Infante A Ferreira - One of the best experts on this subject based on the ideXlab platform.
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Solar Refrigeration options a state of the art review
International Journal of Refrigeration-revue Internationale Du Froid, 2008Co-Authors: C Infante A FerreiraAbstract:Abstract A state-of-the-art review is presented of the different technologies that are available to deliver Refrigeration from Solar energy. The review covers Solar electric, Solar thermal and some new emerging technologies. The Solar thermal systems include thermo-mechanical, absorption, adsorption and desiccant solutions. A comparison is made between the different solutions both from the point of view of energy efficiency and economic feasibility. Solar electric and thermo-mechanical systems appear to be more expensive than thermal sorption systems. Absorption and adsorption are comparable in terms of performance but adsorption chillers are more expensive and bulkier than absorption chillers. The total cost of a single-effect LiBr–water absorption system is estimated to be the lowest.
C. A. Infante Ferreira - One of the best experts on this subject based on the ideXlab platform.
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Solar Refrigeration options - a state-of-the-art review
International Journal of Refrigeration, 2008Co-Authors: D.s. Kim, C. A. Infante FerreiraAbstract:A state-of-the-art review is presented of the different technologies that are available to deliver Refrigeration from Solar energy. The review covers Solar electric, Solar thermal and some new emerging technologies. The Solar thermal systems include thermo-mechanical, absorption, adsorption and desiccant solutions. A comparison is made between the different solutions both from the point of view of energy efficiency and economic feasibility. Solar electric and thermo-mechanical systems appear to be more expensive than thermal sorption systems. Absorption and adsorption are comparable in terms of performance but adsorption chillers are more expensive and bulkier than absorption chillers. The total cost of a single-effect LiBr-water absorption system is estimated to be the lowest. © 2007 Elsevier Ltd and IIR.
O C Iloeje - One of the best experts on this subject based on the ideXlab platform.
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Solar Energy Refrigeration
World Renewable Energy Congress VI, 2007Co-Authors: O C IloejeAbstract:Publisher Summary The need for Solar Refrigeration in a locality is normally determined by the climate, the state of socioeconomic development, and the access to energy resources. The most available Refrigeration technologies are the vapor compression and the diffusion absorption systems that depend on electricity, gas, or kerosene. The world environmental conventions to reduce global warming and ozone depletion from chloro- and fluoro-carbons and fossil fuels, and the correspondence of daily peak demand for space cooling in tropical countries and of its seasonal needs in temperate countries, with variations in Solar radiation, all tend to favor Solar Refrigeration. Solar Powered vapor compression (PV), LiBr-H20, H2O-NH3, AC-Methanol, and CaCI2-NH3 systems have potentials for early entry into the market. However, their high cost and low overall COP require significant improvements to compete favorably with grid powered vapor compression units.
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Quantitative comparisons of treated CaCl2 absorbent for Solar Refrigeration
Solar Energy, 2003Co-Authors: O C IloejeAbstract:Abstract Swelling, compacting and sisintegration of CaCl 2 salt, when used as an absorben in Solar powered Refrigeration, can be reduced by treating the salt with binding meterials. Mixtures of CaCl 2 and Portland Cement at 0%, 10%, 20% and 30% compositions by mass of the latter, and of CaCl 2 and CaSO 4 , at 10% and 20% compositions by mass of CaSO 4 , were prepared as hard porous granules of 5–10 mm in size. Ammonia absorption and generation cycles were carried out for each sample, and average crushing strength determined at the end of each cycle. The samples were compared in their strengths, swelling and absorbabilities to ammonia. It was confirmed that the treatment with the binding materials significantly improved the hardness of te absorbent. Reductinos in swelling, by up to a factor of 30, were realized. Portland cement did not impede the absorption of NH 3 very much, while CaSO 4 did. The Portland cement mixture was optimal at the 20% level, while the mixture with 20% CaSO 4 was the best of all the sample, when both the strengths and absorption capacities were considered.
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Heat and mass transfer in porous spherical pellets of CaCl2 for Solar Refrigeration
Renewable Energy, 2000Co-Authors: S.o. Enibe, O C IloejeAbstract:An analysis of heat and mass transfer in porous spherical pellets with vapour absorption/desorption is presented. The size, shape and thermophysical properties of the pellet is assumed invariant with time, and the volume reaction model is utilised. The temperature of the solid and vapour phases are assumed to be the same at any location. The resulting partial differential equations for the coupled heat and mass transfer processes are solved numerically. Quantitative values are obtained using data specific to the CaCl2–NH3 absorbent–refrigerant system under conditions typical for Solar Refrigeration applications. The generation, diffusion and absorption kinetics of the system are studied by computer simulation for pellet porosity, ϵ, in the range 0.02≤ϵ≤0.10. It is found that, for pellet sizes ranging from 4 to 20 mm diameter, the intra-pellet free ammonia diffusion resistance is negligible. Furthermore, the intra-pellet temperature and absorption level gradients are only significant for pellet sizes greater than about 20 mm. Thus, a lumped parameter analysis of the single pellet problem is adequate for Solar Refrigeration applications, for which absorbent pellet sizes are normally in the range of 3–10 mm. Also, where the absorbent volume is nodularized for numerical solutions of the heat and mass transfer equations, a node size limit of 20 mm should be observed.
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Solar Energy Refrigeration
World Renewable Energy Congress VI, 2000Co-Authors: Adnan A. R. Sayigh, O C IloejeAbstract:The need for Solar Refrigeration in a locality is normally determined by the climate, the state of socioeconomic development, and the access to energy resources. The most available Refrigeration technologies are the vapor compression and the diffusion absorption systems that depend on electricity, gas, or kerosene. The world environmental conventions to reduce global warming and ozone depletion from chloro- and fluoro-carbons and fossil fuels, and the correspondence of daily peak demand for space cooling in tropical countries and of its seasonal needs in temperate countries, with variations in Solar radiation, all tend to favor Solar Refrigeration. Solar Powered vapor compression (PV), LiBr-H20, H2O-NH3, AC-Methanol, and CaCI2-NH3 systems have potentials for early entry into the market. However, their high cost and low overall COP require significant improvements to compete favorably with grid powered vapor compression units.
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Chapter 196 - Solar Energy Refrigeration
World Renewable Energy Congress {VI}, 2000Co-Authors: O C IloejeAbstract:Publisher Summary The need for Solar Refrigeration in a locality is normally determined by the climate, the state of socioeconomic development, and the access to energy resources. The most available Refrigeration technologies are the vapor compression and the diffusion absorption systems that depend on electricity, gas, or kerosene. The world environmental conventions to reduce global warming and ozone depletion from chloro- and fluoro-carbons and fossil fuels, and the correspondence of daily peak demand for space cooling in tropical countries and of its seasonal needs in temperate countries, with variations in Solar radiation, all tend to favor Solar Refrigeration. Solar Powered vapor compression (PV), LiBr-H20, H2O-NH3, AC-Methanol, and CaCI2-NH3 systems have potentials for early entry into the market. However, their high cost and low overall {COP} require significant improvements to compete favorably with grid powered vapor compression units.
Mohammed Jameel - One of the best experts on this subject based on the ideXlab platform.
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a review of thermodynamics and heat transfer in Solar Refrigeration system
Renewable & Sustainable Energy Reviews, 2012Co-Authors: O Afshar, R Saidur, M Hasanuzzaman, Mohammed JameelAbstract:Solar energy is one of the most efficient, clean and affordable energy alternatives available today. With the current concerns about global warming and ever increasing energy rates, countries are seriously looking for domestic and industrial usage of Solar energy. In the present study, a detail review of the application of Solar energy for Refrigeration systems has been carried out. The utilization of Solar energy for Refrigeration systems would help in improvement of energy economics, energy consumption and energy efficiency. The review focuses especially on Solar panel, desiccant fluid for icemaker and its components. The study also includes thermodynamic equation and material for making component of Refrigeration to improve the coefficient of performance. Study around the economic evaluation and Solar performance coefficient in the type of refrigerator, modeling and simulation, mathematical equation of heat transfer and type of absorption used are other topics that could be considered.