Exergy analysis of a solar combined cycle: organic Rankine cycle and absorption cooling system

Grosu, Lavinia; Marin, Andreea; Dobrovicescu, Alexandru; Queiros-Condé, Diogo

doi:10.1007/s40095-015-0168-y

Cited by 33 publications

(13 citation statements)

References 15 publications

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“…The next step is the literature studies with the use of ETC in cogeneration systems. Grosu et al designed a system with ORC and absorption chiller for power and cooling production. They found that the use of 174 m 2 of collecting is able to produce about 5 kW of electricity and 46 kW of cooling.…”

Section: Introductionmentioning

confidence: 99%

Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Bellos

Tzivanidis

2019

Int J Energy Res

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Summary The objective of this work is the investigation of a novel solar‐driven cogeneration system, which combines both flat plate collectors (FPCs) and evacuated tube collectors (ETCs). This system includes an organic Rankine cycle in order to produce electricity and heat exchangers in order to produce useful heating at 50°C, which is a usual temperature level for domestic applications. The combination of FPCs and ETCs aims to reduce the investment cost and so to design a cost‐effective solar‐driven cogeneration system. The FPCs are located before the ETCs in order to work at lower temperature levels and the ETC at higher temperature levels, a design which provides optimum compatibility between temperature levels and solar thermal efficiency values. The system is examined energetically, exergetically, and financially. The power production is selected at 5 kW, while the heating production is studied from 5 kW up to 35 kW. According to the final results, it is found that in the typical case of 20‐kW heating production, the simple payback period of the system is around 11 years, while the energy and exergy efficiency at 16% and 4%, respectively. The analysis is conducted with a developed model in Engineering Equation Solver under steady‐state conditions.

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Section: Introductionmentioning

confidence: 99%

Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Bellos

Tzivanidis

2019

Int J Energy Res

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“…Calise et al studied an ORC‐integrated double‐stage absorption chiller. Grosu et al developed an ORC and ARC combined system for a building. Sun et al proposed an ORC cycle integrated with ARC to utilize the waste heat of flue gas and investigated the effects of evaporation temperature ( T e ), condensation temperature ( T c ) and degree of superheat on the performance of the whole system.…”

Section: Introductionmentioning

confidence: 99%

A new power/cooling cogeneration system using R1234ze(E)/ionic liquid working fluid

Song

Zheng

et al. 2020

Int J Energy Res

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Summary A novel power/cooling system integrated with organic Rankine cycle and absorption‐compression refrigeration cycle was proposed in order to realize the cascade utilization of low‐grade energy. In the proposed system, R1234ze(E) (trans‐1,3,3,3‐tetrafluoropropene) is used as the working fluid for the organic Rankine cycle subsystem and the binary mixtures of R1234ze(E) with three ionic liquids [HMIM][BF4], [EMIM][BF4] and [OMIM][BF4] are used as working fluid for absorption‐compression refrigeration cycle subsystem due to their superior environmental protection property and physicochemical property. Moreover, in order to recover the heat of the exhaust gas from turbine in organic Rankine cycle subsystem, the exhaust gas is mixed with R1234ze(E)/ionic liquid solution directly in desorber, while the heat of refrigerant from desorber is recovered to reduce the heat load of condenser. The proposed system has much higher energy and exergy efficiency and lower heat load of condenser than reference system. Under specific conditions, increases of 0.24 and 0.07 in thermal efficiency and exergy efficiency of reference system can be achieved. The effect of distribution ratio, expansion ratio, heat source temperature, condensation temperature, generation temperature, evaporation temperature and compression ratio were analyzed for better design in actual application.

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“…Notably, a reference book deals essentially with the handling of the solar intensity fluctuations on an automatism point of view, on the basis of constant output temperature for the control of large‐scale steam turbines, with or without thermal storage. Since then, it has been shown, by the use of exergy approach that constant output temperature is not optimal, either for steam plants or other plants . The latest references present exergy optimizations of solar plants based on the available exergy flow only.…”

Section: Introductionmentioning

confidence: 99%

Steady state operation exergy‐based optimization for solar thermal collectors

Grosu

Mathieu

Rochelle

et al. 2019

Env Prog and Sustain Energy

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In this investigation, exergy-based optimization was carried out on two configurations of solar thermal collectors. A set of control sensors were utilized to control the performance of the system and monitor the design variables, that is, inlet and outlet temperature of the solar fluid, ambient temperature, incident solar flux, and required mechanical and electrical work in the system. The fluid temperature was considered to vary in the range of 120-180 C with respect to technical and economic considerations. The collector surface area was considered 606 m 2 in both configurations, and a medium solar incident was considered about 520 W/m 2 . The maximum acceptable temperature difference is obtained as function of the input temperature. The technical limitation is plotted for both configurations of solar collectors. It was noticed that the exergy flow of simple evacuated tubes can reach the maximum value when the input temperature is greater than 115 C for an incident solar flow, from 250 W/m 2 up to the limit of 950 W/m 2 . Exergy analysis demonstrated that more control is required on the temperature control to obtain the optimum performance of the solar collector. Thus, applying exergy optimization approach can be very useful to guide control system, the maximum outlet temperature being a key variable on the performance of the collectors.

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Exergy analysis of a solar combined cycle: organic Rankine cycle and absorption cooling system

Cited by 33 publications

References 15 publications

Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

A new power/cooling cogeneration system using R1234ze(E)/ionic liquid working fluid

Steady state operation exergy‐based optimization for solar thermal collectors

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