Exergetic, economic and environmental (3E) analyses, and multi-objective optimization of a CO2/NH3 cascade refrigeration system

Aminyavari, Mehdi; Najafi, Behzad; Shirazi, Ali; Rinaldi, Fabio

doi:10.1016/j.applthermaleng.2013.12.075

Cited by 183 publications

(47 citation statements)

References 25 publications

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“…또한 Giovanni et al (5) 은 R744와 여러 자연냉매를 혼합한 작동유체를 사용하여 캐스케 이드 냉동시스템의 성능특성에 관한 연구를 수행하였 으며, Mehdi et al (6) 은 R744-R717 캐스케이드 냉동시스 템에서 3E(엑서지, 경제성, 친환경성)에 대한 해석을 진 행하였다. 또한 Getu et al (7) 은 R744 -R717 캐스케이드 냉동시스템의 고단사이클에 다양한 자연냉매를 적용한 비교연구를 수행하였다.…”

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Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

Ryu¹,

Cho²

2015

Korean Journal of Air-Conditioning and Refrigeration Engineerin

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The evaporating temperature range required for the low temperature freezing system is from -50℃ to -30℃. Since it is difficult to keep the required capacity in a cabinet, it is advantageous to design the system using a cascade refrigeration system. Use of carbon dioxide and ammonia would be advantageous since ammonia is an environment-friendly working fluid and has a high capacity for performance improvement. To investigate the performance characteristics of the R744-R717 cascade refrigeration system, a theoretical model was developed and performance was analyzed according to cascade heat exchanger operating temperature. The optimal cascade R744 condensing temperature was -5℃, and maximum COP was 1.13 when the temperature difference of the cascade heat exchanger was 5℃. In addition, the total system COP increased by 1.17 when the cascade temperature gap was 3℃ at the middle temperature of -7.5℃. Key wordsCascade refrigeration system(캐스케이드 냉동시스템), Carbon dioxide(이산화탄소), Ammonia(암모니아), COP(성능계수) †Corresponding author, E-mail: hhcho@chosun.ac.kr

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Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

Ryu¹,

Cho²

2015

Korean Journal of Air-Conditioning and Refrigeration Engineerin

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“…Researchers who have used genetic algorithms for multi-objective optimisation of heat transfer and fluid flow problems include Kim et al [19], Ndao et al [20], Cortes-Quiroz et al [21,22] and Karathanassis et al [23]. Other authors have applied multi-objective optimisation to thermal systems such as refrigeration systems [24] and energy storage systems [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Multi-objective and thermodynamic optimisation of a parabolic trough receiver with perforated plate inserts

Mwesigye

Bello‐Ochende

Meyer

2015

Applied Thermal Engineering

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In this paper, multi-objective and thermodynamic optimisation procedures are used to investigate the performance of a parabolic trough receiver with perforated plate inserts. Three dimensionless perforated plate geometrical parameters considered in the optimisation include the dimensionless orientation angle, the dimensionless plate diameter and the plate spacing per unit meter. The Reynolds number varies in the range 1.02 × 10 4 ≤ Re ≤ 1.36×10 6 depending on the fluid temperature. The multi-objective optimisation was realised through the combined use of computational fluid dynamics, design of experiments, response surface methodology and the Non-dominated Sorted Genetic Algorithm-II. For thermodynamic optimisation, the entropy generation minimisation method was used to determine configurations with minimum entropy generation rates. Keywords

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“…Different authors have analyzed the First and Second Laws of Thermodynamics to measure the performance of mechanical cooling systems and absorption systems and target thermal comfort (KEÇEBAS, 2013;JAIN et al, 2013;ATTAR et al, 2014;OCHOA et al, 2014a;OCHOA et al, 2014b;OCHOA et al, 2014c;LIN et al, 2014;AMINYAVARI et al, 2014;ALLEYNE, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, this analysis can be applied to compare the behavior of different cooling fluids and thereby to seek the best performance in terms of the cooling capacity of the equipment (NAPHON; WIRIYASART, 2012;APREA et al, 2013;ZOU;HRNJAK, 2014;SHE et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

<b>Comparative study of air conditioning systems with vapor compression chillers using the concept of green buildings

2015

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ABSTRACT. This paper sets out to compare two different cooling systems that use vapor compression chillers for air conditioning environments. It was proposed to compare different operations in isolated and combined action operations. These operations are evaluated in the concepts of green buildings. A mathematical model was developed based on the principles of mass and energy conservation and complemented by various functions so as to determine the thermophysical properties and efficiencies of the compressors. The equations of the model were solved by the EES (Engineering Equation Solver) program. The model evaluates the influence of the main HVAC operating parameters of the chilled water system when operating under three different configurations. The results showed that the system with a differentiated compression presents a COP equal to that of the system with screw chillers in the range 0-300 RTs, and a COP hat is on average 9% higher in the range 400-800 RTs.Keywords: centrifugal chiller, screw chiller, energy, simulation, COP.Estudo comparativo de sistemas de ar condicionado com chillers de compressão de vapor com o conceito de edifícios verdes RESUMO. O presente trabalho se propõe a comparar dois sistemas de refrigeração diferentes usando chiller de compressão de vapor, para a climatização de ambientes. Foi proposto operações diferentes para a comparação em operações isoladas e ações combinadas. Essas operações são avaliadas nos conceitos de edifícios verdes. Foi desenvolvido um modelo matemático baseado nos princípios de conservação de massa e energia e complementado por várias funções, de modo a determinar as propriedades termofísicas e eficiências dos compressores. As equações do modelo foram resolvidos pelo programa EES (Engineering Equation Solver). O modelo avalia a influência dos parâmetros operacionais principais do sistema de refrigeração de água gelada operando em três configurações diferentes. Os resultados mostraram que o sistema com compressão diferenciada apresenta COP igual ao do sistema com chillers parafuso na faixa de 0 a 300 TRs, e um COP superior em média de 9% na faixa de 400 a 800 TRs.Palavras-chave: chiller centrifugo, chiller de parafuso, energia, simulação, COP.

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Exergetic, economic and environmental (3E) analyses, and multi-objective optimization of a CO2/NH3 cascade refrigeration system

Cited by 183 publications

References 25 publications

Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

Multi-objective and thermodynamic optimisation of a parabolic trough receiver with perforated plate inserts

<b>Comparative study of air conditioning systems with vapor compression chillers using the concept of green buildings

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