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Damola S Adelekan - One of the best experts on this subject based on the ideXlab platform.

  • Exergy analysis of vapor compression Refrigeration System using R450A as a replacement of R134a
    Journal of Thermal Analysis and Calorimetry, 2019
    Co-Authors: Jatinder Gill, Olayinka S. Ohunakin, Jagdev Singh, Damola S Adelekan
    Abstract:

    This paper experimentally investigated exergetic performance analysis of vapor compression Refrigeration System using R450a as a replacement for R134a at different evaporator and condenser temperatures within controlled environmental conditions. The exergetic performance analysis of the vapor compression Refrigeration System with test parameters including efficiency defects in the components, total irreversibility, and exergy efficiency of the Refrigeration System was performed. Findings showed that the total irreversibility and exergy efficiency of the vapor compression Refrigeration System using R450A refrigerant were lower and higher than R134a by about 15.25–27.32% and 10.07–130.93%, respectively. However, the efficiency defect in the condenser, compressor, and evaporator of the R450A Refrigeration System was lower than R134a by about 16.99–26.08%, 5.03–20.11%, and 1.85–15.85%, respectively. Conversely, efficiency defect in the capillary tube of the R450A Refrigeration System was higher than R134a by about 14.66–78.97% under similar operating conditions. Overall, it was found that the most efficient component was the evaporator, and the least efficient component was the compressor for both refrigerants.

Kamal Abdel Radi Ismail - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation of a variable speed Refrigeration System
    International Journal of Refrigeration-revue Internationale Du Froid, 2001
    Co-Authors: R N N Koury, Luiz Machado, Kamal Abdel Radi Ismail
    Abstract:

    Abstract This work presents two numerical models to simulate the transient and steady state behavior of a vapor compression Refrigeration System. The condenser and the evaporator were divided into a number of control volumes. Time dependent partial differential equations System was obtained from the mass, energy and momentum balances for each control volume. As the expansion valve and the compressor both have very small thermal inertia, the steady state models were applied for these components. Transient and steady state models numerical predictions were compared and good agreement was found. Further simulations were performed with the objective of verifying the possibility of controlling the Refrigeration System and the superheating of the refrigerant in the evaporator outlet by varying the compressor speed and the throttling valve sectional area. The results indicate that the proposed models can be used to formulate an algorithm for controlling a Refrigeration System.

Peixue Jiang - One of the best experts on this subject based on the ideXlab platform.

  • hybrid vapor compression Refrigeration System with an integrated ejector cooling cycle
    International Journal of Refrigeration-revue Internationale Du Froid, 2012
    Co-Authors: Peixue Jiang
    Abstract:

    Abstract A Refrigeration System was developed which combines a basic vapor compression Refrigeration cycle with an ejector cooling cycle. The ejector cooling cycle is driven by the waste heat from the condenser in the vapor compression Refrigeration cycle. The additional cooling capacity from the ejector cycle is directly input into the evaporator of the vapor compression Refrigeration cycle. The governing equations are derived based on energy and mass conservation in each component including the compressor, ejector, generator, booster and heat exchangers. The System performance is first analyzed for the on-design conditions. The results show that the COP is improved by 9.1% for R22 System. The System is then compared with a basic Refrigeration System for variations of five important variables. The System analysis shows that this Refrigeration System can effectively improve the COP by the ejector cycle with the refrigerant which has high compressor discharge temperature.

Xianting Li - One of the best experts on this subject based on the ideXlab platform.

  • optimization of Refrigeration System with gas injected scroll compressor
    International Journal of Refrigeration-revue Internationale Du Froid, 2009
    Co-Authors: Baolong Wang, Xianting Li
    Abstract:

    Gas refrigerant injection has been proven as an effective method to improve the performance of the scroll compressor and its Refrigeration System under high compression ratio working conditions. Much research on the injected scroll compressor and its System has been conducted, but the universal control and design method is still lacking. A model of the Refrigeration System with a gas-injected scroll compressor is developed in this paper. With this model, the effects of gas injection on the System and component parameters are investigated. Based on the identified evaporator characteristics and thermodynamic analysis, a set of general principles for the design and operation of the Refrigeration or heat pump System with a gas-injected scroll compressor is proposed.

  • Optimization of Refrigeration System with gas-injected scroll compressor
    International Journal of Refrigeration, 2009
    Co-Authors: Baolong Wang, Linjun Han, Wenxing Shi, Xianting Li
    Abstract:

    Gas refrigerant injection has been proven as an effective method to improve the performance of the scroll compressor and its Refrigeration System under high compression ratio working conditions. Much research on the injected scroll compressor and its System has been conducted, but the universal control and design method is still lacking. A model of the Refrigeration System with a gas-injected scroll compressor is developed in this paper. With this model, the effects of gas injection on the System and component parameters are investigated. Based on the identified evaporator characteristics and thermodynamic analysis, a set of general principles for the design and operation of the Refrigeration or heat pump System with a gas-injected scroll compressor is proposed. © 2009 Elsevier Ltd and IIR.

  • Influence of refrigerant injection on Refrigeration System with scroll compressor
    Huagong Xuebao Journal of Chemical Industry and Engineering (China), 2006
    Co-Authors: Baolong Wang, Wenxing Shi, Qisen Yan, Xianting Li
    Abstract:

    The influence of refrigerant injection on a Refrigeration System with a scroll compressor is researched by the numerical and experimental method. The thermodynamic essence of the refrigerant injection process is revealed in this paper. At the same time, the optimization problems are discussed. Based on the optimal injection states, the optimization potential of the Refrigeration System with an injected scroll compressor is analyzed. Finally, an engineering expression of the optimal injection pressure is presented.

Jatinder Gill - One of the best experts on this subject based on the ideXlab platform.

  • Exergy analysis of vapor compression Refrigeration System using R450A as a replacement of R134a
    Journal of Thermal Analysis and Calorimetry, 2019
    Co-Authors: Jatinder Gill, Olayinka S. Ohunakin, Jagdev Singh, Damola S Adelekan
    Abstract:

    This paper experimentally investigated exergetic performance analysis of vapor compression Refrigeration System using R450a as a replacement for R134a at different evaporator and condenser temperatures within controlled environmental conditions. The exergetic performance analysis of the vapor compression Refrigeration System with test parameters including efficiency defects in the components, total irreversibility, and exergy efficiency of the Refrigeration System was performed. Findings showed that the total irreversibility and exergy efficiency of the vapor compression Refrigeration System using R450A refrigerant were lower and higher than R134a by about 15.25–27.32% and 10.07–130.93%, respectively. However, the efficiency defect in the condenser, compressor, and evaporator of the R450A Refrigeration System was lower than R134a by about 16.99–26.08%, 5.03–20.11%, and 1.85–15.85%, respectively. Conversely, efficiency defect in the capillary tube of the R450A Refrigeration System was higher than R134a by about 14.66–78.97% under similar operating conditions. Overall, it was found that the most efficient component was the evaporator, and the least efficient component was the compressor for both refrigerants.