Analysis of a solar Rankine cycle powered refrigerator with zeotropic mixtures

Zheng, Nan; Wei, Jinjia; Zhao, Li

doi:10.1016/j.solener.2018.01.011

Cited by 52 publications

(17 citation statements)

References 25 publications

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“…The working fluid employed in the VCC is Isobutane. It was selected owing to its relatively better thermal performance in comparison with the competitors [15,[36][37][38]. The VCC working fluid cools the returning district cooling water stream in its evaporator as it gets vaporized in the evaporator from state 16 to state 17.…”

Section: System Descriptionmentioning

confidence: 99%

Assessment of a District Trigeneration Biomass Powered Double Organic Rankine Cycle as Primed Mover and Supported Cooling

et al. 2021

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This study presents a combined cooling, heating, and power system powered by biogas, suitable for small scale communities in remote locations. To run such a system, in order to obtain the daily life essentials of electricity, hot water, and cooling, municipal waste can be considered as an option. Furthermore, the organic Rankine cycle part of the organic Rankine cycle powered vapor compression chiller can be used in times of need for additional electric production. The system comprises a medium temperature organic Rankine cycle utilizing M-xylene as its working fluid, and the cooling was covered by an Isobutane vapor compression cycle powered by an R245fa employing organic Rankine cycle. The system analyzed was designated to provide 250 kW of electricity. The energetic and exergetic analysis was performed, considering several system design parameters. The impact of the design parameters in the prime mover has a much greater effect on the whole system. The system proposed can deliver cooling values at the rate between 9.19 and 22 kW and heating values ranging from 879 up to 1255 kW, depending on the design parameter. Furthermore, the second law efficiency of the system was found to be approximately 56% at the baseline conditions and can be increased to 64.5%.

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Section: System Descriptionmentioning

confidence: 99%

Assessment of a District Trigeneration Biomass Powered Double Organic Rankine Cycle as Primed Mover and Supported Cooling

et al. 2021

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“…Although dual fluid systems offer operational flexibilities but lack in terms of lower integration level because of independency of both ORC and VCR sub‐cycles. Moreover, single fluid ORC–VCR system offers several other benefits over dual one such as direct coupling of the expander with the compressor to minimize mechanical losses; conversion of expander work into electricity when cooling is not needed; use of same working fluid both in ORC and VCR sub‐cycles 15,18 . Therefore, single fluid ORC–VCR systems have gained attention lately among researchers.…”

Section: Introductionmentioning

confidence: 99%

“…To the best knowledge of authors, most of the studies have focused on pure working fluids and simpler structures except Reference 15 in which only first law analysis of the ORC–VCR system was carried out using zeotropic mixtures. A comprehensive analysis of the ORC–VCR system based on both first and second law analyses is required.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of simple and modified organic Rankine cycle and vapor compression refrigeration (ORC–VCR) systems

Ashwni

Sherwani

Tiwari

2020

Env Prog and Sustain Energy

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This paper compares the thermodynamic performance of two ORC–VCR systems using the zeotropic mixture (Hexane/R245fa); one is a simple ORC–VCR system whereas the second one is a modified ORC–VCR system. Both ORC–VCR systems are different in terms of VCR sub‐cycle. The modified ORC–VCR system contains an additional flash tank, expansion valve, and compressor compared to the simple ORC–VCR system in the VCR sub‐cycle. The thermodynamic performance of the systems have been evaluated in terms of Cooling capacity (Qevap), Coefficient of performance of the system (COPs), exergetic efficiency (ηex), and cost function (UAtot) . Modified ORC–VCR system exhibits 23.4, 23.4, 29.00, and 41% enhancement in cooling capacity (Qevap), COPs, exergetic efficiency (ηex), and cost function (UAtot), respectively, compared to the simple system. Moreover, there is 4, 5, and 84.73% enhancement in Qevap at the mass fraction of 0.9, COPs at the mass fraction of 0.6, and ηex at the mass fraction of 0.5 for the modified ORC–VCR system with the use of the zeotropic mixture.

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“…A summary of the previous studies on ORC-VCC systems is given in Table 1. Zheng et al [16] investigated the performance of a solar Rankine cycle powered VCC by using zeotropic mixtures, although solar radiation was taken as constant in order to assess the performance of different refrigerants. The present study shows the transient performance of the ORC-VCC system using real solar radiation data.…”

Section: Introductionmentioning

confidence: 99%

A study on heat storage sizing and flow control for a domestic scale solar-powered organic Rankine cycle-vapour compression refrigeration system

Kutlu

Erdinç

et al. 2019

Renewable Energy

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This paper presents the off-design modelling of a domestic scale solar organic Rankine cycle (ORC) and vapour compression cycle (VCC) in a coupled operation in different operating modes by using evacuated flat plate (EFP) collectors. Thermodynamic and parametric studies of such coupled system in literature usually assume that the isentropic efficiencies of expander and compressor and the heat exchanger pinch temperature differences are constant. Moreover, studies for directly coupling the ORC-VCC system with solar collectors are somewhat rare. Transient performance of the solar ORC-VCC considering the off-design behaviour of the system components needs to be investigated. A simulation for a period of 24hrs is conducted by considering the electricity and cooling demand of a 60 m 2 office building during a typical day in July for Istanbul. The effect of heat storage capacity on meeting the demand is investigated for a given area of EFP collectors. Moreover, the water flow rate to the boiler is controlled periodically to provide the demanded electricity and cooling. The required EFP collector area and heat storage unit volume have been determined to be 80 m 2 and 9.4 m 3 , respectively. For these design parameters, 25.6 kWh cooling and 18.76 kWh electricity can be generated during a typical day in July. Finally, a simulation is given for such design on a sunny winter day in February, 5.5 kWh electricity and 104 kWh heat can be produced.

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Analysis of a solar Rankine cycle powered refrigerator with zeotropic mixtures

Cited by 52 publications

References 25 publications

Assessment of a District Trigeneration Biomass Powered Double Organic Rankine Cycle as Primed Mover and Supported Cooling

Assessment of a District Trigeneration Biomass Powered Double Organic Rankine Cycle as Primed Mover and Supported Cooling

Thermodynamic analysis of simple and modified organic Rankine cycle and vapor compression refrigeration (ORC–VCR) systems

A study on heat storage sizing and flow control for a domestic scale solar-powered organic Rankine cycle-vapour compression refrigeration system

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