Energy and exergy analyses of a bi-evaporator compression/ejection refrigeration cycle

2016 ◽  
Vol 130 ◽  
pp. 71-80 ◽  
Author(s):  
Lihong Geng ◽  
Huadong Liu ◽  
Xinli Wei ◽  
Zhonglan Hou ◽  
Zhenzhen Wang
Keyword(s):  
Refrigeration Cycle ◽  
Energy And Exergy ◽  
Exergy Analyses

scholarly journals CASCADE REFRIGERATION SYSTEM FOR LOW TEMPERATURES USING NATURAL FLUIDS

2021 ◽  
Vol 20 (2) ◽  
pp. 20
Author(s):  
V. B. Rangel ◽  
A. G. S. Almeida
Keyword(s):  
Low Temperatures ◽  
Refrigeration Cycle ◽  
Refrigeration System ◽  
Cascade System ◽  
Energy And Exergy ◽  
Laws Of Thermodynamics ◽  
Cascade Refrigeration System ◽  
Cascade Refrigeration ◽  
Natural Refrigerant ◽  
Exergy Analyses

Cascade refrigeration systems work with two or more serial disposed cycles and can obtain internal temperatures below -60°C, which is necessary for several activities in medicine and scientific research. This paper presents a thermodynamic analysis of cascade system refrigeration using natural refrigerant fluids for ultra-low temperatures. These fluids are environmentally friendly refrigerant and are an alternative to hydro chlorofluorocarbons (HCFCs) and to hydrofluorocarbons (HFCs). Energy and exergy analyses were performed using a thermodynamic model based on the law of conservation of mass and also on the first and second laws of thermodynamics. A simulator was developed to assess the technical practicability of this system, considering it running as a real refrigeration cycle. Natural fluids have best performance energetically and environmentally.

Energy and Exergy Analyses of a New Triple-Staged Refrigeration Cycle Using Solar Heat Source

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Abdul Khaliq ◽  
Rajesh Kumar ◽  
Ibrahim Dincer ◽  
Farrukh Khalid
Keyword(s):  
Heat Transfer Fluid ◽  
Design Parameters ◽  
Refrigeration Cycle ◽  
Outlet Temperature ◽  
Absorption Refrigeration ◽  
Evaporator Temperature ◽  
Central Receiver ◽  
Energy And Exergy ◽  
Exergy Performance ◽  
Exergy Analyses

In this paper, energy and exergy analyses of a new solar-driven triple-staged refrigeration cycle using Duratherm 600 oil as the heat transfer fluid are performed. The proposed cycle is an integration of absorption refrigeration cycle (ARC), ejector (EJE) refrigeration cycle (ERC), and ejector expansion Joule–Thomson (EJT) refrigeration cryogenic cycles which could produce refrigeration output of different magnitude at different temperature simultaneously. Both exergy destruction and losses in each component and hence in the overall system are determined to identify the causes and locations of the thermodynamic imperfection. Several design parameters, including the hot oil outlet temperature, refrigerant turbine inlet pressure, and the evaporator temperature of ERC and EJT cycle are also tested to evaluate their effects on energy and exergy performance. It is observed that largest contribution to cycle irreversibility comes from the central receiver and heliostat field with the heat recovery vapor generator (HRVG), condenser, and ejector of ERC itself also contributing considerably. The exergy efficiency of the solar-driven triple-staged refrigeration cycle is 4% which is much lower than its energy efficiency of 10%, respectively. The results clearly reveal that thermodynamic investigations based on energy analysis alone cannot legitimately be complete unless the exergy concept becomes a part of the analysis.

Performance evaluation of serpentine and multi-channel heat sinks based on energy and exergy analyses

2021 ◽  
Vol 186 ◽  
pp. 116475
Author(s):  
Nabeel Sameer Mahmoud ◽  
Hayder Mohammad Jaffal ◽  
Ahmed Abdulnabi Imran
Keyword(s):  
Performance Evaluation ◽  
Heat Sinks ◽  
Energy And Exergy ◽  
Exergy Analyses

Energy and exergy analyses of a mixed-mode solar dryer of pear slices (Pyrus communis L)

Energy ◽  
2021 ◽  
pp. 119740
Author(s):  
López-Vidaña Erick César ◽  
César-Munguía Ana Lilia ◽  
García-Valladares Octavio ◽  
Salgado Sandoval Orlando ◽  
Domínguez Niño Alfredo
Keyword(s):  
Mixed Mode ◽  
Pyrus Communis ◽  
Solar Dryer ◽  
Pyrus Communis L ◽  
Energy And Exergy ◽  
Exergy Analyses

Energy and exergy analyses of a raw mill in a cement production

2006 ◽  
Vol 26 (17-18) ◽  
pp. 2479-2489 ◽  
Author(s):  
Zafer Utlu ◽  
Ziya Sogut ◽  
Arif Hepbasli ◽  
Zuhal Oktay
Keyword(s):  
Cement Production ◽  
Energy And Exergy ◽  
Exergy Analyses

Corrigendum to “Energy and exergy analyses of the oxidation and gasification of carbon”

Energy ◽  
2006 ◽  
Vol 31 (12) ◽  
pp. 2245-2246 ◽  
Author(s):  
M.J. Prins ◽  
K.J. Ptasinski
Keyword(s):  
Energy And Exergy ◽  
Gasification Of Carbon ◽  
Exergy Analyses
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