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S Manu - One of the best experts on this subject based on the ideXlab platform.
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On-chip waste Heat-driven absorption cooling system for sustainable data center environment: simulation
International Journal of Sustainable Engineering, 2017Co-Authors: S Manu, T K ChandrashekarAbstract:AbstractDevelopment of waste Heat-driven absorption-based cooling system is inspired for the need of removing high Heat flux from the sustainable data centre environment. This paper presents a simulation study of single-stage Lithium Bromide–Water (LiBr–H2O) vapour absorption Heat pump for chip cooling. In the present work, a complete thermodynamic analysis of the single-stage LiBr–H2O vapour absorption-based Heat pump for chip cooling without a Solution Heat Exchanger is performed and a user friendly graphical user interface (GUI) package including visual components is developed by using MATlab (2008b). The effect of chip Heat flux on COP (Coefficient of Performance), flow rates and conductance is examined using the developed package. The model is verified using the data available in the literature which indicates that there is a greater reduction in the absorber load. The influence of chip Heat flux on the performance and thermal loads of individual components are studied, and it is concluded that COP d...
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A simulation study on performance evaluation of single-stage LiBr–H2O vapor absorption Heat pump for chip cooling
International journal of sustainable built environment, 2016Co-Authors: S Manu, T K ChandrashekarAbstract:The growth of Lithium Bromide–Water (LiBr–H2O) absorption based Heat pump is encouraged for the necessity of extracting high Heat from the electronic chips. This paper presents a simulation study of single-stage LiBr–H2O vapor absorption Heat pump for chip cooling. In this study, a detailed thermodynamic analysis of the single-stage LiBr–H2O vapor absorption Heat pump for chip cooling in the nonexistence of Solution Heat Exchanger was performed and a user-friendly graphical user interface (GUI) package including visual components was developed by using MATlab (2008b). The influence of chip temperature on COP (Coefficient of Performance), flow rates and conductance was examined by using the developed package. The model is validated by using the values available in the literature and indicates that there is a greater reduction in the absorber load. The influence of chip temperature on the performance and thermal loads of individual components was studied and it was concluded that, COP increases from 0.7145 to 0.8421 with an increase in chip temperature.
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effect of operating temperature on the performance and thermal load of water lithium bromide vapour absorption Heat pump in the absence of Solution Heat Exchanger
Applied Mechanics and Materials, 2014Co-Authors: S Manu, T K Chandrashekar, A J AntonyAbstract:In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of Solution Heat Exchanger is performed. The influence of operating temperature on the thermal loads of components, COPc (Carnot Coefficient of Performance), COPE (Enthalpy based Coefficient of Performance) and efficiency ratio (η) is studied. It is concluded that the COPc and COPE values decreases with increasing condenser and absorber temperature but increase with increasing generator and evaporator temperatures .
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Effect of Operating Temperature on the Performance and Thermal Load of Water/Lithium Bromide Vapour Absorption Heat Pump in the Absence of Solution Heat Exchanger
Applied Mechanics and Materials, 2014Co-Authors: S Manu, T K Chandrashekar, A J AntonyAbstract:In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of Solution Heat Exchanger is performed. The influence of operating temperature on the thermal loads of components, COPc (Carnot Coefficient of Performance), COPE (Enthalpy based Coefficient of Performance) and efficiency ratio (η) is studied. It is concluded that the COPc and COPE values decreases with increasing condenser and absorber temperature but increase with increasing generator and evaporator temperatures .
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effect of approching temperature on the performance and size of libr water vapour absorption refrigeration in the absence of Solution Heat Exchanger
International Journal of Research in Engineering and Technology, 2014Co-Authors: S ManuAbstract:In this study, a detailed thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle is performed. The influences of approaching temperatures, conductance and coefficients of performance are investigated. Plots of coefficients of performance and conductance are shown against approaching temperatures of the system. It is concluded that the performance and conductance decreases with increase in approaching temperature of all the components.
Surendra Singh Kachhwaha - One of the best experts on this subject based on the ideXlab platform.
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nlp model based thermoeconomic optimization of vapor compression absorption cascaded refrigeration system
Energy Conversion and Management, 2015Co-Authors: Vaibhav Jain, Gulshan Sachdeva, Surendra Singh KachhwahaAbstract:Abstract This paper addresses the size and cost estimation of vapor compression–absorption cascaded refrigeration system (VCACRS) for water chilling application taking R410a and water–LiBr as refrigerants in compression and absorption section respectively which can help the design engineers in manufacturing and experimenting on such kind of systems. The main limitation in the practical implementation of VCACRS is its size and cost which are optimized in the present work by implementing Direct Search Method in non-linear programming (NLP) mathematical model of VCACRS. The main objective of optimization is to minimize the total annual cost of system which comprises of costs of exergy input and capital costs in monetary units. The appropriate set of decision variables (temperature of evaporator, condenser, generator, absorber, cascade condenser, degree of overlap and effectiveness of Solution Heat Exchanger) minimizes the total annual cost of VCACRS by 11.9% with 22.4% reduction in investment cost at the base case whereas the same is reduced by 7.5% with 11.7% reduction in investment cost with reduced rate of interest and increased life span and period of operation. Optimization results show that the more investment cost in later case is well compensated through the performance and operational cost of the system. In the present analysis, optimum cascade condensing temperature is a strong function of period of operation and capital recovery factor. The cascading of compression and absorption systems becomes attractive for lower rate of interest and increase life span and operational period.
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EXERGY ANALYSIS OF A VAPOR COMPRESSION–VAPOR ABSORPTION CASCADE SYSTEM
International Journal of Air-conditioning and Refrigeration, 2013Co-Authors: Gulshan Sachdeva, Vaibhav Jain, Surendra Singh KachhwahaAbstract:In this paper, second law analysis has been done for the vapor compression–vapor absorption (VC–VA) cascade system. Ammonia–water is considered as the working pair in absorption section and R407C is dealt as the working fluid in VC section. Exergy destruction or the irreversibility rate is determined in each components of VC–VA cascade system, for a wide range of cooling capacity by considering a variable speed reciprocating compressor. Further in this, Coefficient of structural bond (CSB) analysis is carried out to quantify the effect of varying the generator temperature, effectiveness of Solution Heat Exchanger, inlet temperature of external fluids in evaporator/condenser and some other variables. Solution Heat Exchanger and the condenser are reported to have high CSB value, so have a great scope of improvement to reduce the irreversibility rate of the whole system.
T K Chandrashekar - One of the best experts on this subject based on the ideXlab platform.
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On-chip waste Heat-driven absorption cooling system for sustainable data center environment: simulation
International Journal of Sustainable Engineering, 2017Co-Authors: S Manu, T K ChandrashekarAbstract:AbstractDevelopment of waste Heat-driven absorption-based cooling system is inspired for the need of removing high Heat flux from the sustainable data centre environment. This paper presents a simulation study of single-stage Lithium Bromide–Water (LiBr–H2O) vapour absorption Heat pump for chip cooling. In the present work, a complete thermodynamic analysis of the single-stage LiBr–H2O vapour absorption-based Heat pump for chip cooling without a Solution Heat Exchanger is performed and a user friendly graphical user interface (GUI) package including visual components is developed by using MATlab (2008b). The effect of chip Heat flux on COP (Coefficient of Performance), flow rates and conductance is examined using the developed package. The model is verified using the data available in the literature which indicates that there is a greater reduction in the absorber load. The influence of chip Heat flux on the performance and thermal loads of individual components are studied, and it is concluded that COP d...
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A simulation study on performance evaluation of single-stage LiBr–H2O vapor absorption Heat pump for chip cooling
International journal of sustainable built environment, 2016Co-Authors: S Manu, T K ChandrashekarAbstract:The growth of Lithium Bromide–Water (LiBr–H2O) absorption based Heat pump is encouraged for the necessity of extracting high Heat from the electronic chips. This paper presents a simulation study of single-stage LiBr–H2O vapor absorption Heat pump for chip cooling. In this study, a detailed thermodynamic analysis of the single-stage LiBr–H2O vapor absorption Heat pump for chip cooling in the nonexistence of Solution Heat Exchanger was performed and a user-friendly graphical user interface (GUI) package including visual components was developed by using MATlab (2008b). The influence of chip temperature on COP (Coefficient of Performance), flow rates and conductance was examined by using the developed package. The model is validated by using the values available in the literature and indicates that there is a greater reduction in the absorber load. The influence of chip temperature on the performance and thermal loads of individual components was studied and it was concluded that, COP increases from 0.7145 to 0.8421 with an increase in chip temperature.
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effect of operating temperature on the performance and thermal load of water lithium bromide vapour absorption Heat pump in the absence of Solution Heat Exchanger
Applied Mechanics and Materials, 2014Co-Authors: S Manu, T K Chandrashekar, A J AntonyAbstract:In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of Solution Heat Exchanger is performed. The influence of operating temperature on the thermal loads of components, COPc (Carnot Coefficient of Performance), COPE (Enthalpy based Coefficient of Performance) and efficiency ratio (η) is studied. It is concluded that the COPc and COPE values decreases with increasing condenser and absorber temperature but increase with increasing generator and evaporator temperatures .
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Effect of Operating Temperature on the Performance and Thermal Load of Water/Lithium Bromide Vapour Absorption Heat Pump in the Absence of Solution Heat Exchanger
Applied Mechanics and Materials, 2014Co-Authors: S Manu, T K Chandrashekar, A J AntonyAbstract:In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of Solution Heat Exchanger is performed. The influence of operating temperature on the thermal loads of components, COPc (Carnot Coefficient of Performance), COPE (Enthalpy based Coefficient of Performance) and efficiency ratio (η) is studied. It is concluded that the COPc and COPE values decreases with increasing condenser and absorber temperature but increase with increasing generator and evaporator temperatures .
R.s. Agarwal - One of the best experts on this subject based on the ideXlab platform.
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Performance evaluation of a small capacity compression–absorption refrigeration system
Applied Thermal Engineering, 2012Co-Authors: A. K. Pratihar, S.c. Kaushik, R.s. AgarwalAbstract:Abstract Simulation of a 100 kW ammonia-water compression–absorption system has been carried out for water chilling application by incorporating detailed Heat and mass transfer calculations in the absorber and desorber of the system. Warner's technique has been used for the convergence of iterations. The effect of relative Solution Heat Exchanger area on the COP, cooling capacity, absorber Heat load and effectiveness of Solution Heat Exchanger has been studied. With increase in the relative Solution Heat Exchanger area from 17 to 50%, COP increases initially, becomes maximum at 39% and then decreases. However, capacity of the system decreases considerably as a result of increase in relative Solution Heat Exchanger area. Due to pressure drop in the Solution Heat Exchanger on weak Solution side, pumping power increased by 30% but COP decreased by only 0.92%. The performance of this system has been compared with that of a conventional vapor compression type chiller.
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Simulation of an ammonia–water compression–absorption refrigeration system for water chilling application
International Journal of Refrigeration-revue Internationale Du Froid, 2010Co-Authors: A. K. Pratihar, S.c. Kaushik, R.s. AgarwalAbstract:Abstract A detailed simulation of a 400 kW ammonia–water compression–absorption refrigeration system has been carried out for water chilling application for summer air conditioning. Simulation has been performed for three different configurations of system having 17%, 23%, and 30% relative Solution Heat Exchanger areas. The effect of relative Solution Heat Exchanger area and mass flow rate of weak Solution on the COP, cooling capacity and absorber Heat load has been studied. The results show that the COP of the system can be increased by maintaining low mass flow rate of weak Solution and large relative Solution Heat Exchanger area. Increase in the relative Solution Heat Exchanger area from 10 to 30% resulted in an increase in COP by about 16%. Further increase in relative SHX area revealed that there exists an optimum area at which COP becomes maximum. The performance of this system has been compared with that of a conventional R 22 vapor compression type chiller.
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Simulation of an ammonia - Water compression - Absorption refrigeration system for water chilling application
International Journal of Refrigeration, 2010Co-Authors: A. K. Pratihar, S.c. Kaushik, R.s. AgarwalAbstract:A detailed simulation of a 400 kW ammonia-water compression-absorption refrigeration system has been carried out for water chilling application for summer air conditioning. Simulation has been performed for three different configurations of system having 17%, 23%, and 30% relative Solution Heat Exchanger areas. The effect of relative Solution Heat Exchanger area and mass flow rate of weak Solution on the COP, cooling capacity and absorber Heat load has been studied. The results show that the COP of the system can be increased by maintaining low mass flow rate of weak Solution and large relative Solution Heat Exchanger area. Increase in the relative Solution Heat Exchanger area from 10 to 30% resulted in an increase in COP by about 16%. Further increase in relative SHX area revealed that there exists an optimum area at which COP becomes maximum. The performance of this system has been compared with that of a conventional R 22 vapor compression type chiller. ?? 2010 Elsevier Ltd and IIR. All rights reserved.
I W Eames - One of the best experts on this subject based on the ideXlab platform.
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development of a packed bed regenerative Solution Heat Exchanger r shx for a single stage libr h2o vapour absorption refrigeration var system
Applied Thermal Engineering, 2013Co-Authors: A Paurine, G G Maidment, I W EamesAbstract:Abstract Single effect LiBr–H 2 O vapour absorption refrigeration (VAR) systems operate without using electromechanical energy and instead, they are powered using low-grade Heat energy. The improved performance of these systems has always relatively depended on the continued use and improvement of conventional ancillary Solution Heat Exchangers (SHXs). The inclusion of SHXs in VAR systems not only increase the risk of crystallisation but also the pressure drop in the Solution lines and therefore necessitating high energy intensive electromechanical pumps for circulating the working fluids. Therefore, development of a novel VAR system incorporating a novel high efficiency regenerative Heat Exchanger with low maintenance costs and reduced risks of crystallisation is the subject of this paper. Specifically, this paper describes the modelling, design, manufacture and testing of a packed bed regenerative Solution Heat Exchanger (R-SHX) for improved effectiveness of a novel VAR system.
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Development of a packed bed regenerative Solution Heat Exchanger (R-SHX) for a single stage LiBr–H2O vapour absorption refrigeration (VAR) system
Applied Thermal Engineering, 2013Co-Authors: A Paurine, G G Maidment, I W EamesAbstract:Abstract Single effect LiBr–H 2 O vapour absorption refrigeration (VAR) systems operate without using electromechanical energy and instead, they are powered using low-grade Heat energy. The improved performance of these systems has always relatively depended on the continued use and improvement of conventional ancillary Solution Heat Exchangers (SHXs). The inclusion of SHXs in VAR systems not only increase the risk of crystallisation but also the pressure drop in the Solution lines and therefore necessitating high energy intensive electromechanical pumps for circulating the working fluids. Therefore, development of a novel VAR system incorporating a novel high efficiency regenerative Heat Exchanger with low maintenance costs and reduced risks of crystallisation is the subject of this paper. Specifically, this paper describes the modelling, design, manufacture and testing of a packed bed regenerative Solution Heat Exchanger (R-SHX) for improved effectiveness of a novel VAR system.