Dynamic simulation and exergy analysis of an Organic Rankine Cycle integrated with vapor compression refrigeration system

Malwe, Prateek D.; Shaikh, Juned; Gawali, B. S.; Panchal, Hitesh; Dalkılıç, Ahmet Selim; Saidur, R.; Alrubaie, Ali Jawad

doi:10.1016/j.seta.2022.102684

Cited by 11 publications

(10 citation statements)

References 62 publications

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“…The volumetric efficiency for R-134a (41%) is lower than that for R-600a, which is 60%, due to the cycle's high-pressure ratio, which was confirmed by Groll [22] and to the difference in the specific volume of the refrigerants. This result agrees with that in the study [11], but is down more due to the irreversibility increase in the evaporator. The isentropic efficiency is around 65% for the cycle of R-134a, which is lower than that for R-600a, 70%, due to the irreversibility of the compression process.…”

Section: Exergy Analysissupporting

confidence: 93%

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Exergy Analysis of Chest Freezer Working with R-134a and R-600a at Steady State Conditions

Ali¹,

Mahdi²

2023

IJEPM

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In the present work, exergy analysis has been experimentally evaluated for a chest freezer to assist in sizing calculations and selecting the most suitable working fluid, which can reduce the power consumption. In the present work, exergy analysis has been experimentally evaluated for a chest freezer to assist in sizing calculations and selecting the most suitable working fluid to reduce power consumption. The experimental measurements were carried out using a 150 litters chest freezer volume capacity running on R-134a and R-600a using different compressors. The freezer provides measurement instruments for pressure, temperature, refrigerant mass flow and power consumption. The tests were carried out with a standard ambient temperature of 32. The results show that the evaporator had the highest exergy loss value of 59% for R-134a and 62% for R-600a. Compressor exergy losses are 64% for R-134a and 63% for R-600a. The condenser showed exercise losses of 79% for R-134a and 75% for R-600a, while the limitation device (capillary tube) had exercise losses of 87% for R134a and 99.5% for R-600a. The thermal performance of the chest freezer represented by the second low efficiency is 43% for R-134a and 50% for R-600a. The thermal performance of the freezer with R-600a is better than R-134a due to the energy consumption reducing and evaporator behaviour.

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Section: Exergy Analysissupporting

confidence: 93%

“…In contrast, the condenser has the greatest efficiency, followed by the throttle valve and evaporator. Malwe et al [11] performed analytical and experimental tests for cold refrigeration rooms working with R12 using the exergy analysis technique. It was discovered that the system's second law efficiency is 58%.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Chest Freezer Working with R-134a and R-600a at Steady State Conditions

Ali¹,

Mahdi²

2023

IJEPM

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“…The temperature difference at the pinch point is 5 °C. [2,40,41] The pinch point of ORC heat exchangers is important as it affects the system's thermal efficiency and the total heat absorbed by the working fluid. Twomey et al [40] evaluated the dynamic performance of a small-scale solar thermal cogeneration with an ORC using a scroll expander.…”

Section: Resultsmentioning

confidence: 99%

Design and Implementation of a Control Strategy for a Dynamic Organic Rankine Cycle‐Based Power System in the Context of Industrial Waste Heat Recovery

Saha,

Chakraborty,

Mondal

et al. 2023

Energy Tech

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Transient thermal waste heat sources, such as solar energy, industrial waste heat, and ship exhaust heat, pose significant challenges in terms of their reuse in other processes. Therefore, ensuring the safe and efficient design and operation of the Organic Rankine Cycle (ORC) system for these heat sources is imperative. Comprehending the ORC system’s dynamic characteristics is necessary to formulate suitable control strategies. This paper undertakes a comprehensive review of previous studies on dynamic modelling and control of the ORC system and discusses the prevalent dynamic modelling methodologies, the challenges frequently encountered in dynamic simulations, and a range of control strategies. This paper comprehensively analyses the overall control strategies employed by ORC systems.Additionally, the energy conversion systems utilised in ORC are depicted in detail. Furthermore, using Model Predictive Control (MPC) in a simulation study allows for investigating various components’ disturbance and dynamic characteristics within the ORC system. These components include the expander, pump, condenser, and evaporator using set‐point tracking. Ultimately, this analysis aims to optimise the performance of the ORC cycle. The findings of our study indicate that the utilisation of superheating in the working fluid is the most effective method for achieving maximum power generation in an ORC system.This article is protected by copyright. All rights reserved.

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“…The present result agrees with that of Daniarta et al 29 and other researchers who have shown that (ORC) systems are the most efficient and reliable method of converting waste heat from low and medium temperatures into usable power. [30][31][32][33][34] Figure 9 shows the effects of increasing the inlet temperature of the turbine on overall cycle efficiency. Increasing overall cycle efficiency is evident with an increased in turbine inlet temperature.…”

Section: Modelsmentioning

confidence: 99%

“…Many researchers have shown that (ORC) systems are the most efficient and reliable method of converting waste heat from low and medium temperatures into usable power. [30][31][32][33][34] Therefore, the present article focuses on applying a new idea using the initial heating through the solar pool and the surface collector, then converting the warm water coming into superheated steam using the concentrated solar collector in the ORC. Thus, using pre-heated water with the solar collector gives temperatures in most seasons sufficient to ignite the ORC system in the present study to cover this scientific gap.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study to Increase the Solar-Organic Rankine Cycle Efficiency

Alshahrany

Hassan

2023

Yanbu Journal of Engineering and Science

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Under conditions of high climate temperature and environmental pollution, scientists are turning to the use of new and renewable energy. The solar Organic Rankin Cycle (ORC) is greatest technology for converting low or medium-temperature energy sources into electricity. For the purpose of generating steam from solar energy to power the organic Rankin cycle a system consists of solar pond, flat plate collector and parabolic dish was designed, implemented, and tested to use in organic Rankin cycle (ORC). The novelty in the present work is the use of the solar pond as storage of heat that does not lose because the salinity gradient middle layer in the pond does not allow heat to pass through it, as well as the use of reheating to enhance the thermodynamic efficiency. Also, an analytical model has been made to enhance the output power and efficiency of the solar thermal ORC according to some organic control criteria. A Cycle of solar thermal power plants (ORC) is simulated with four refrigerants, R144a, R123, R124 and R245fa of working fluid’s performance. The cycle net-specific work can be verified at the highest efficiency as a function of turbine extraction numbers, over-temperature, and evaporation temperature. Superheated steam was obtained at a temperature of 327 °C to be used in the Rankin cycle of the solar energy system which is generated in this work. The maximum output power improvement is 9% when using the working fluid R123 for R124, 5.5% for R245fa, and approximately 2.8 for R144a. And the thermal efficiency of ORC is higher with R123 compared to 144a by about 2.2%. Furthermore, it also concluded that both inlet and outlet temperatures of a turbine are very important factors that affect the operational performance of organic Rankin cycle power generation systems.

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Dynamic simulation and exergy analysis of an Organic Rankine Cycle integrated with vapor compression refrigeration system

Cited by 11 publications

References 62 publications

Exergy Analysis of Chest Freezer Working with R-134a and R-600a at Steady State Conditions

Exergy Analysis of Chest Freezer Working with R-134a and R-600a at Steady State Conditions

Design and Implementation of a Control Strategy for a Dynamic Organic Rankine Cycle‐Based Power System in the Context of Industrial Waste Heat Recovery

Experimental and Theoretical Study to Increase the Solar-Organic Rankine Cycle Efficiency

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