Exergy analysis of a compression refrigeration system

Kumar, S.; Prévost, Michel; Bugarel, R.

doi:10.1016/0890-4332(89)90079-3

Cited by 25 publications

(9 citation statements)

References 6 publications

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“…Even many decades after the inception of VCS, for example, thermodynamic analysis aimed at improving VCS performance and efficiency continues to be relevant to this day, as evident from the works of Kumar et al, 30 Bayrakçi climates is still needed. In spite of the significant improvements that dehumidification and cooling technologies could potentially achieve through careful system design, integration, and energy recuperation, as our study demonstrates, studies in the literature have mainly focused on either one system configuration or on multiple commercially existing ones.…”

mentioning

confidence: 99%

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

et al. 2017

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Recently, next-generation HVAC technologies have gained attention as potential alternatives to the conventional vapor-compression system (VCS) for dehumidification and cooling. Previous studies have primarily focused on analyzing a specific technology or its application to a particular climate. A comparison of these technologies is necessary to elucidate the reasons and conditions under which one technology might outperform the rest. In this study, we apply a uniform framework based on fundamental thermodynamic principles to assess and compare different HVAC technologies fromGeneration HVAC: Prospects for and Limitations of Desiccant and Membrane-Based Dehumidification and Cooling," Applied Energy, 200:330-346, 15 August 2017.an energy conversion standpoint. The thermodynamic least work of dehumidification and cooling is formally defined as a thermodynamic benchmark, while VCS performance is chosen as the industry benchmark against which other technologies, namely desiccant-based cooling system (DCS) and membrane-based cooling system (MCS), are compared. The effect of outdoor temperature and humidity on device performance is investigated, and key insights underlying the dehumidification and cooling process are elucidated. In spite of the great potential of DCS and MCS technologies, our results underscore the need for improved system-level design and integration if DCS or MCS are to compete with VCS. Our findings have significant implications for the design and operation of next-generation HVAC technologies and shed light on potential avenues to achieve higher efficiencies in dehumidification and cooling applications.

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confidence: 99%

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

et al. 2017

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“…It was possible to notice that the results calculated for exergy loss in each component in Aspen HYSYS®, are similar to the results calculated with thermodynamic tables in the Table III. The results for the COP, and ̇, have been calculated in Aspen HYSYS® using (8), (15) and (7) respectively. According to the results obtained in Aspen Hysys®, it is possible to validate the procedure used in this paper to calculate the COP and the exergy efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…Exergy analysis is commonly used as a tool in obtaining an improved understanding of the overall system and system components through to the quantification of inefficiency sources and distinguishing energy refrigerant R12. Moreover, by its nature, does not deplete the ozone layer, R134a is not considered a hazardous waste component as defined by the Act of Resource Conservation and Recovery of the United States 1976 [7].…”

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confidence: 99%

Application of a genetic algorithm to optimize the exergy performance of a vapor compression refrigeration system

Valencia¹,

Castro²,

Narvaez³

2018

ces

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This paper presents a theoretical performance study of a vapour compression refrigeration (VCR) system using R134a, R22, R32, and R40. The VCR system was modeled and simulated in Aspen HYSYS® through the selection of the proper fluid package to compare the Coefficient of Performance (COP) and the exergy of four different conventional refrigerants against different temperatures values. The results obtained have been compared through graphics that allow to identify the most proper refrigerant for the VCR. Finally, the use of genetic algorithm allowed to obtained the optimal operational condition.

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“…Exergy is defined as the theoretical maximum (reversible) work available if the energy source is at equilibrium with the environment. Two types of equilibria are unrestricted equilibrium and restricted equilibrium [14]. In unrestricted equilibrium, the conditions of thermal, mechanical and chemical equilibrium between the system and the environment are satisfied.…”

Section: Exergy Concept and Dead Statesmentioning

confidence: 99%

Exergy Analysis of a Vapor Compression Heat Pump Working With R12 Alternatives

Fatouh

Nabil

El-genady

1999

International Conference on Aerospace Sciences and Aviation Tec

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In the present work, exergy analysis method is applied to estimate exergy and exergy loss of each component, total exergy loss, dimensionless exergy loss of each component, and exergetic efficiency of vapor compression heat pump for simultaneous cooling and heating applications over a wide range of operating conditions. Varied parameters include evaporation and condensation temperatures, refrigerant type and compressor speed. Five refrigerants namely; R12, R124, R134a, R152a and R290 are used as working fluids. Evaporation temperature ranging from 0 to 10°C is used to achieve the required water supply temperature for chiller systems. Condensation temperature is varied between 50 and 80°C to cover a wide range of applications such as hot water supply, drying, cleaning ... etc. Compressor speed is changed from 750 to 3000rpm. Results showed that the change in compressor speed yields the highest influence on the refrigerant mass flow rate followed by that of evaporation temperature and then by that of the condensation temperature. This leads to that varying of compressor speed can effectively control exergy output of the heat pump. Effect of the evaporation temperature on exergy loss rate and its dimensionless exergy loss of the compressor and expansion device is essential. The exergy loss rate of the expansion device is more sensitive to the condensation temperature followed by the compressor, liquid-suction: neat exchanger, the condenser and the evaporator in that order. However, at higher condensation temperatures, the expansion device and the compressor yield about 47% and 35% of total exergy loss respectively. R290 demands the highest input exergy while R124 needs the lowest required exergy. From high useful exergy point of view, the preferable refrigerants are R290, R152a, R134a, R12 and R124 in that order. At evaporation temperature of 0°C, the maximum exergetic efficiency can be obtained by R152a followed by R12, R124, R134a and finally by R290. However, at evaporation temperature of 10°C, the maximum efficiency value of the VCHP for simultaneous cooling and heating applications is 0.54, 0.53, 0.49, 0.48 and 0.44 for R12, R152a, R124, R134a and R290 respectively. The condensation temperatures ranging from 55°C to 60°C yield the maximum exergetic efficiency for all refrigerants under investigation.

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Exergy analysis of a compression refrigeration system

Cited by 25 publications

References 6 publications

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling

Application of a genetic algorithm to optimize the exergy performance of a vapor compression refrigeration system

Exergy Analysis of a Vapor Compression Heat Pump Working With R12 Alternatives

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