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M A Alghoul - One of the best experts on this subject based on the ideXlab platform.

  • Enhancement aspects of single stage absorption Cooling Cycle: A detailed review
    Renewable & Sustainable Energy Reviews, 2017
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzaman Sopian, Hasan Sh. Majdi, Ali Najah Al-shamani, Ali F. Muftah
    Abstract:

    Multiple simulations, experiments, and review studies on absorption Cooling technology and Cycles were conducted over the past few decades. However, the absorption Cooling systems are not seen as competitive against more established vapor compression systems. Therefore, further research and development (R&D) are needed to enable absorption Cooling technology to compete with vapor compression technology via the development of energy efficient, cost effective, environmentally friendly, and compact size systems. This study reviews the R&D enhancement aspects of single-stage absorption Cooling Cycles in terms of subcomponents, supported components added to the absorption Cycle, internal energy recovery, and working fluids options. The R&D efforts on single-stage absorption Cycles are detailed in a rich and simple presentation to provide a base for further modifications in the future, i.e., towards the optimization of the design geometry of distillation column inside within the generator, towards using adjustable ejector to work under actual operating conditions, applying new streamlines re-arrangements as a passive heat recovery technique, combination of internal heat recovery and superior (non-conventional) working fluids, and finally the addition of nanoparticles into the working fluid to optimize the duty of the generator. The outcome(s) of this study are detailed in the lessons-learned section, and future research priorities are highlighted in conclusion section.

  • performance evaluation of flash tank absorption Cooling Cycle using two ejectors
    Applied Thermal Engineering, 2016
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzaman Sopian
    Abstract:

    Abstract Combining the ejector-flash tank with the single stage absorption Cycle has shown potential improvement in the COP. However, the Cycle is still subject for further enhancement. Addition of two ejectors in the Cycle to work under low-pressure of evaporator and intermediate-pressure of flash tank could optimize the COP of the Cycle. In this study, the effect of adding two ejectors has been investigated. Moreover, a new stream line between 2 nd ejector and the rectifier has been created and evaluated. Energy balance analyses of the Cycle before and after modification have been carried out. A computer simulation program has been developed to evaluate the performance of the Cycles using ammonia–water solution as working fluid, operating under steady-state conditions. The results indicated that the overall COPs increment of the modified Cycle are 11.56%, 12.42%, 13.46% and 14.05% at generator temperature of 80 °C, 85 °C, 90 °C, and 95 °C respectively. The results also showed that utilizing a part of streamlines of 2 nd ejector decreased the heat power in the generator and hence increase the COP. Generator and condenser thermal loads after modification are found permanently less than that in the Cycle before modification which indicates a significant enhancement of the proposed Cycle. The results showed also that the proposed Cycle is able to work under higher operation temperatures as same performance as the Cycle before modification (with one ejector) under lower operation temperatures. So, this investigation could help to promote absorption Cooling systems in locations of high temperature conditions.

  • performance evaluation of flash tank absorption Cooling Cycle using two ejectors
    Applied Thermal Engineering, 2016
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzama Sopia
    Abstract:

    Abstract Combining the ejector-flash tank with the single stage absorption Cycle has shown potential improvement in the COP. However, the Cycle is still subject for further enhancement. Addition of two ejectors in the Cycle to work under low-pressure of evaporator and intermediate-pressure of flash tank could optimize the COP of the Cycle. In this study, the effect of adding two ejectors has been investigated. Moreover, a new stream line between 2 nd ejector and the rectifier has been created and evaluated. Energy balance analyses of the Cycle before and after modification have been carried out. A computer simulation program has been developed to evaluate the performance of the Cycles using ammonia–water solution as working fluid, operating under steady-state conditions. The results indicated that the overall COPs increment of the modified Cycle are 11.56%, 12.42%, 13.46% and 14.05% at generator temperature of 80 °C, 85 °C, 90 °C, and 95 °C respectively. The results also showed that utilizing a part of streamlines of 2 nd ejector decreased the heat power in the generator and hence increase the COP. Generator and condenser thermal loads after modification are found permanently less than that in the Cycle before modification which indicates a significant enhancement of the proposed Cycle. The results showed also that the proposed Cycle is able to work under higher operation temperatures as same performance as the Cycle before modification (with one ejector) under lower operation temperatures. So, this investigation could help to promote absorption Cooling systems in locations of high temperature conditions.

Kostyantyn Shestopalov - One of the best experts on this subject based on the ideXlab platform.

  • An improved cascade mechanical compression–ejector Cooling Cycle
    Energy, 2019
    Co-Authors: Guangming Chen, Volodymyr Ierin, Oleksii Volovyk, Kostyantyn Shestopalov
    Abstract:

    Abstract In this paper, a method for improving the efficiency of the cascade mechanical compression–ejector Cooling Cycle is described. The considered Cooling Cycle is the combination of the electrically driven carbon dioxide (CO2) subcritical mechanical compression Cooling Cycle as a bottoming Cycle, and the heat driven ejector Cooling Cycle as a topping Cycle. This Cooling Cycle is proposed to use superheated CO2 vapor to preheat the working fluid supplied to the vapor generator, thus improving the whole system's efficiency. This paper provides thermodynamic analysis results for the cascade Cooling system in a wide range of evaporating temperatures. Refrigerants R245ca, R600, and R601b were investigated as the working fluids for the ejector Cooling Cycle, and the results show that the proposed Cooling Cycle is the most effective at low evaporating temperatures.

  • Theoretical analysis and optimization of a hybrid CO2 transcritical mechanical compression – ejector Cooling Cycle
    International Journal of Refrigeration, 2017
    Co-Authors: Guangming Chen, Volodymyr Ierin, Oleksii Volovyk, Daibin Zhu, Kostyantyn Shestopalov
    Abstract:

    The paper provides the results of a design-theoretical study of a hybrid carbon dioxide (CO2) transcritical mechanical compression – ejector Cooling Cycle. The hybrid Cooling Cycle is a combination of a CO2 transcritical mechanical compression refrigeration machine (MCRM) powered by electricity, and an ejector Cooling machine (ECM) driven by heat rejected from the CO2 Cooling Cycle. Refrigerants R245ca, R601b (neopentane) and R717 (ammonia) are investigated as the working fluids of ECM in the present study. A method to determine the optimal design parameters and performance of the hybrid Cooling Cycle is presented. It is shown, that efficiency growth of the transcritical CO2 Cooling Cycle due to ejector Cooling Cycle use is higher as evaporating temperatures are lower.

  • Design-theoretical study of hybrid CO2 transcritical mechanical compression-ejector Cooling Cycle.
    2015
    Co-Authors: G Chen, V Ierin, Kostyantyn Shestopalov
    Abstract:

    This paper provides the main results of design-theoretical study of the hybrid carbon dioxide (??2) transcritical mechanical compression-ejector Cooling Cycle. The hybrid refrigeration Cycle is the combination of a CO2 transcritical mechanical compression refrigeration machine (MCRM), powered by electricity, and an ejector Cooling machine (ECM) driven by heat rejected in the compression Cycle. Refrigerants R245fa, R601b (neopentane) and R717 (ammonia) are selected as the environmentally friendly working fluids of ECM in the present study. A method for determination of the optimal design parameters and performance of the hybrid ??2 transcritical mechanical compression-ejector Cooling Cycle is presented. The obtained data provide necessary information to design such systems for application in domestic and industrial refrigeration and air-conditioning systems under different climatic conditions.

Azher M Abed - One of the best experts on this subject based on the ideXlab platform.

  • Enhancement aspects of single stage absorption Cooling Cycle: A detailed review
    Renewable & Sustainable Energy Reviews, 2017
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzaman Sopian, Hasan Sh. Majdi, Ali Najah Al-shamani, Ali F. Muftah
    Abstract:

    Multiple simulations, experiments, and review studies on absorption Cooling technology and Cycles were conducted over the past few decades. However, the absorption Cooling systems are not seen as competitive against more established vapor compression systems. Therefore, further research and development (R&D) are needed to enable absorption Cooling technology to compete with vapor compression technology via the development of energy efficient, cost effective, environmentally friendly, and compact size systems. This study reviews the R&D enhancement aspects of single-stage absorption Cooling Cycles in terms of subcomponents, supported components added to the absorption Cycle, internal energy recovery, and working fluids options. The R&D efforts on single-stage absorption Cycles are detailed in a rich and simple presentation to provide a base for further modifications in the future, i.e., towards the optimization of the design geometry of distillation column inside within the generator, towards using adjustable ejector to work under actual operating conditions, applying new streamlines re-arrangements as a passive heat recovery technique, combination of internal heat recovery and superior (non-conventional) working fluids, and finally the addition of nanoparticles into the working fluid to optimize the duty of the generator. The outcome(s) of this study are detailed in the lessons-learned section, and future research priorities are highlighted in conclusion section.

  • performance evaluation of flash tank absorption Cooling Cycle using two ejectors
    Applied Thermal Engineering, 2016
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzaman Sopian
    Abstract:

    Abstract Combining the ejector-flash tank with the single stage absorption Cycle has shown potential improvement in the COP. However, the Cycle is still subject for further enhancement. Addition of two ejectors in the Cycle to work under low-pressure of evaporator and intermediate-pressure of flash tank could optimize the COP of the Cycle. In this study, the effect of adding two ejectors has been investigated. Moreover, a new stream line between 2 nd ejector and the rectifier has been created and evaluated. Energy balance analyses of the Cycle before and after modification have been carried out. A computer simulation program has been developed to evaluate the performance of the Cycles using ammonia–water solution as working fluid, operating under steady-state conditions. The results indicated that the overall COPs increment of the modified Cycle are 11.56%, 12.42%, 13.46% and 14.05% at generator temperature of 80 °C, 85 °C, 90 °C, and 95 °C respectively. The results also showed that utilizing a part of streamlines of 2 nd ejector decreased the heat power in the generator and hence increase the COP. Generator and condenser thermal loads after modification are found permanently less than that in the Cycle before modification which indicates a significant enhancement of the proposed Cycle. The results showed also that the proposed Cycle is able to work under higher operation temperatures as same performance as the Cycle before modification (with one ejector) under lower operation temperatures. So, this investigation could help to promote absorption Cooling systems in locations of high temperature conditions.

  • performance evaluation of flash tank absorption Cooling Cycle using two ejectors
    Applied Thermal Engineering, 2016
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzama Sopia
    Abstract:

    Abstract Combining the ejector-flash tank with the single stage absorption Cycle has shown potential improvement in the COP. However, the Cycle is still subject for further enhancement. Addition of two ejectors in the Cycle to work under low-pressure of evaporator and intermediate-pressure of flash tank could optimize the COP of the Cycle. In this study, the effect of adding two ejectors has been investigated. Moreover, a new stream line between 2 nd ejector and the rectifier has been created and evaluated. Energy balance analyses of the Cycle before and after modification have been carried out. A computer simulation program has been developed to evaluate the performance of the Cycles using ammonia–water solution as working fluid, operating under steady-state conditions. The results indicated that the overall COPs increment of the modified Cycle are 11.56%, 12.42%, 13.46% and 14.05% at generator temperature of 80 °C, 85 °C, 90 °C, and 95 °C respectively. The results also showed that utilizing a part of streamlines of 2 nd ejector decreased the heat power in the generator and hence increase the COP. Generator and condenser thermal loads after modification are found permanently less than that in the Cycle before modification which indicates a significant enhancement of the proposed Cycle. The results showed also that the proposed Cycle is able to work under higher operation temperatures as same performance as the Cycle before modification (with one ejector) under lower operation temperatures. So, this investigation could help to promote absorption Cooling systems in locations of high temperature conditions.

Kamaruzzaman Sopian - One of the best experts on this subject based on the ideXlab platform.

  • Enhancement aspects of single stage absorption Cooling Cycle: A detailed review
    Renewable & Sustainable Energy Reviews, 2017
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzaman Sopian, Hasan Sh. Majdi, Ali Najah Al-shamani, Ali F. Muftah
    Abstract:

    Multiple simulations, experiments, and review studies on absorption Cooling technology and Cycles were conducted over the past few decades. However, the absorption Cooling systems are not seen as competitive against more established vapor compression systems. Therefore, further research and development (R&D) are needed to enable absorption Cooling technology to compete with vapor compression technology via the development of energy efficient, cost effective, environmentally friendly, and compact size systems. This study reviews the R&D enhancement aspects of single-stage absorption Cooling Cycles in terms of subcomponents, supported components added to the absorption Cycle, internal energy recovery, and working fluids options. The R&D efforts on single-stage absorption Cycles are detailed in a rich and simple presentation to provide a base for further modifications in the future, i.e., towards the optimization of the design geometry of distillation column inside within the generator, towards using adjustable ejector to work under actual operating conditions, applying new streamlines re-arrangements as a passive heat recovery technique, combination of internal heat recovery and superior (non-conventional) working fluids, and finally the addition of nanoparticles into the working fluid to optimize the duty of the generator. The outcome(s) of this study are detailed in the lessons-learned section, and future research priorities are highlighted in conclusion section.

  • performance evaluation of flash tank absorption Cooling Cycle using two ejectors
    Applied Thermal Engineering, 2016
    Co-Authors: Azher M Abed, M A Alghoul, Kamaruzzaman Sopian
    Abstract:

    Abstract Combining the ejector-flash tank with the single stage absorption Cycle has shown potential improvement in the COP. However, the Cycle is still subject for further enhancement. Addition of two ejectors in the Cycle to work under low-pressure of evaporator and intermediate-pressure of flash tank could optimize the COP of the Cycle. In this study, the effect of adding two ejectors has been investigated. Moreover, a new stream line between 2 nd ejector and the rectifier has been created and evaluated. Energy balance analyses of the Cycle before and after modification have been carried out. A computer simulation program has been developed to evaluate the performance of the Cycles using ammonia–water solution as working fluid, operating under steady-state conditions. The results indicated that the overall COPs increment of the modified Cycle are 11.56%, 12.42%, 13.46% and 14.05% at generator temperature of 80 °C, 85 °C, 90 °C, and 95 °C respectively. The results also showed that utilizing a part of streamlines of 2 nd ejector decreased the heat power in the generator and hence increase the COP. Generator and condenser thermal loads after modification are found permanently less than that in the Cycle before modification which indicates a significant enhancement of the proposed Cycle. The results showed also that the proposed Cycle is able to work under higher operation temperatures as same performance as the Cycle before modification (with one ejector) under lower operation temperatures. So, this investigation could help to promote absorption Cooling systems in locations of high temperature conditions.

P A Sleigh - One of the best experts on this subject based on the ideXlab platform.

  • the use of solar desiccant Cooling in the uk a feasibility study
    Applied Thermal Engineering, 2002
    Co-Authors: S P Halliday, Clive B Beggs, P A Sleigh
    Abstract:

    The desiccant Cooling Cycle is a novel open heat driven Cycle which can be used both to cool and dehumidify air. Being a heat driven Cycle, desiccant Cooling affords an opportunity to utilise heat which might otherwise be wasted. It can therefore be coupled to solar collectors to produce a Cooling system which, in theory, should be environmentally friendly. This paper discusses the feasibility of using solar energy to power the desiccant Cooling Cycle and also presents a study, in which a solar desiccant Cooling model is used to evaluate installations located in the southeast and east midlands of England, and in central Scotland. The paper demonstrates that solar powered desiccant Cooling is a feasible solution for Cooling and heating buildings in the United Kingdom.