Energetic and exergetic investigation of a novel refrigeration system utilizing ejector integrated subcooling using different refrigerants

Yılmaz, Tuncay; Erdinç, Mehmet Tahir

doi:10.1016/j.energy.2018.11.081

Cited by 28 publications

(3 citation statements)

References 33 publications

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“…Li et al [18] analytically studied a solarbased ejector-cascade heat pump (coupling a R134a, R1234yf, R141b ejector cycle with a R1234yf vapor compression system); Khaliq et al [19] analytically studied the integration of a solar-based organic rankine cycle (R141b, R600a, R290, R717, R143a) with a NH 3 -LiNO 3 ejector-absorption cycle. Yilmaz et al [20] proposed a screening of refrigerants (R134a, R1234yf, R245fa, R290, R32, R717, R600a) to assess the performance of a novel ERS with a subcooling. Despite above-mentioned references proposed just a simple view regarding ongoing activities, it is clear that the use of low-GWP refrigerants in ejector systems is a matter of intense discussion.…”

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confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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“… For the cooling mode of the ORC-VCC system, the difference between the condensation temperature and the ambient air temperature was considered to be 10 [22], [23]. This value is practically recommended for obtaining appropriate cost of heat exchanger [24].…”

Section: Fig1 Schematic Views Of Heating and Cooling Modes Of Orc-vccmentioning

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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“…Among the refrigerants examined ref. [11], R290 was found to have global warming potential (GWP) and zero emission. R290 is regarded as an environmentally friendly, economical, and practical refrigerant with suitable cooling performance [12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of Comparative R290vs. R449a Refrigerants by Using 3e (Energy, Exergy and Environment) Analysis: A Supermarket Application

Arslan

Koşan

Aktaş

et al. 2021

Journal of Thermal Engineering

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Efficiency is becoming an increasingly important issue in cooling systems. It is important to use micro channel heat exchangers in order to increase the cooling system efficiency. In this study, performance analysis of refrigerants used in supermarkets was tested experimentally. Thermodynamic analyses of the refrigerants were examined. The compatibility of R290 and R449A refrigerants with the environment has been experimentally observed. Energy, exergy, and environmental analyses were performed using R290 and R449a refrigerants based on the test results for 24 hours using double inlet and double outlet evaporator. Accordingly, in the experiments using R290, the exergy efficiency and COP value are 43.52 % and 2.09, respectively. In experiments using R449A, these values were found to be 22.28 % and 1.59. Exergy efficiency was increased by 48.81 % in experiments using propane. In addition, an increase of 24.12% was observed in the Coefficient of Performance (COP) value. Considering the environmental analysis results, the amount of CO2 emitted by the R290 refrigerant to the atmosphere during the test period was 3.14 kg/h and R449A was calculated as 3.97 kg/h. It was seen in this study that the R290 refrigerant emits 26.22 % less CO2 to the atmosphere.

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Energetic and exergetic investigation of a novel refrigeration system utilizing ejector integrated subcooling using different refrigerants

Cited by 28 publications

References 33 publications

Ejectors on the cutting edge: The past, the present and the perspective

Ejectors on the cutting edge: The past, the present and the perspective

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

Experimental Assessment of Comparative R290vs. R449a Refrigerants by Using 3e (Energy, Exergy and Environment) Analysis: A Supermarket Application

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