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.

Investigating the effect of using nanofluids on the performance of a double-effect absorption refrigeration cycle combined with a solar collector

2019 ◽  
Vol 234 (7) ◽  
pp. 981-993 ◽  
Author(s):  
Mohamad Aramesh ◽  
Fathollah Pourfayaz ◽  
Mehdi Haghir ◽  
Alibakhsh Kasaeian ◽  
Mohammad H Ahmadi
Keyword(s):  
Heat Transfer ◽  
Ag Nanoparticles ◽  
Pure Water ◽  
Double Effect ◽  
Heat Transfer Fluid ◽  
Working Fluid ◽  
Inlet Temperature ◽  
Refrigeration Cycle ◽  
Outlet Temperature ◽  
Absorption Refrigeration

In this article, the performance of a double-effect LiBr-H2O absorption refrigeration cycle is studied and is improved by applying solar energy and utilizing nanofluids. A trough collector is used to preheat the working fluid before entering the generator of the cycle. In addition, four different nanofluids are considered as the heat transfer fluid of the collector: Al2O3, Ag, Cu, and CuO. The effects of using nanofluids on the outlet temperature of the heat transfer fluid, the temperature of the working fluid entering the generator, the heat produced by the generator, and COP of the cycle are studied. Different concentrations of the nanoparticles from 0 to 2.5% are considered for the nanofluids. The results indicate that in all the concentrations, Ag nanoparticles will have a better performance comparing to the other types. Furthermore, it was concluded that the higher concentrations of the nanoparticles and along with it the higher inlet temperature of the generator will decrease the generator heat production rate up to 4%. Moreover, considering the constant cooling capacity of the cycle, usage of the Ag nanoparticles in the concentration of 2.5% increases the value of COP up to 3.9%, with respect to the pure water.

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

THERMODYNAMIC ANALYSIS AND PERFORMANCE ASSESSMENT OF A CASCADE ACTIVE MAGNETIC REGENERATIVE REFRIGERATION SYSTEM

2013 ◽  
Vol 21 (03) ◽  
pp. 1350016 ◽  
Author(s):  
HADI GANJEHSARABI ◽  
IBRAHIM DINCER ◽  
ALI GUNGOR
Keyword(s):  
Exergy Efficiency ◽  
Heat Transfer Fluid ◽  
Total Power ◽  
Design Parameters ◽  
Refrigeration System ◽  
Total Power Consumption ◽  
Energy And Exergy ◽  
And Performance ◽  
Cascade Refrigeration ◽  
Important Design

In the present study, a thermodynamic model is proposed to analyze and assess the performance, through energy and exergy, of a cascade active magnetic regenerative (AMR) refrigerator operation a regenerative Brayton cycle. This cascade refrigeration system works with Gd x Tb 1–x alloys as magnetic materials where the composition of the alloy varies for different stages. In this model, the heat transfer fluid considered is a water– glycol mixture (50% by weight). The refrigeration capacity, total power consumption, coefficients of performance (COP), exergy efficiency and exergy destruction rate of a cascade AMR refrigeration (AMRR) system are determined. To understand the system performance more comprehensively, a parametric study is performed to investigate the effects of several important design parameters on COP and exergy efficiency of the system.

Investigating the performance of novel green solvents in absorption refrigeration cycles: Energy and exergy analyses

2020 ◽  
Vol 113 ◽  
pp. 174-186 ◽  
Author(s):  
Reza Haghbakhsh ◽  
Hamed Peyrovedin ◽  
Sona Raeissi ◽  
Ana Rita C. Duarte ◽  
Alireza Shariati
Keyword(s):  
Absorption Refrigeration ◽  
Green Solvents ◽  
Energy And Exergy ◽  
Exergy Analyses

ENERGY AND EXERGY ANALYSIS OF COMPACT POWER GENERATION AND HYBRID SOLAR ENERGY-WASTE HEAT-BASED TRIPLE EFFECT EJECTOR-VAPOR ABSORPTION REFRIGERATION CYCLE

2013 ◽  
Vol 21 (04) ◽  
pp. 1350023 ◽  
Author(s):  
RAJ KUMAR ◽  
ANIL KUMAR
Keyword(s):  
Power Generation ◽  
Exergy Analysis ◽  
Waste Heat ◽  
Energy Output ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Exhaust Energy ◽  
Vapor Absorption Refrigeration

An NH 3– H 2 O ejector-absorption refrigeration cycle, and an R-152a ejector refrigeration cycle are employed with a renewable energy power generator to make a proposed compact power generation and triple effect ejector-absorption refrigeration cycle. The exergy analysis of the cycle leads to a possible performance improvement. Approximately 71.69% of the input exergy is destructed due to irreversibilities in different components. Around 7.976% is available as the useful exergy output. The exhaust exergy lost to the environment is 20.33%, which is lower than the exhaust energy loss of 47.95%, while the useful energy output is 27.88%. The refrigerants used are of zero ODP and negligible GWP, and the CO 2 emission of the exhaust gases is very small as compared to that of the fossil fuel run engine, hence, this cycle is favorable to the global environment. The results also show that the proposed cycle has significant higher energy and exergy efficiency than the earlier investigated 'triple effect refrigeration cycle' and 'the combined power and ejector-refrigeration cycle'.

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.

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