Integrated energy–exergy optimization of a novel micro-CCHP cycle based on MGT–ORC and steam ejector refrigerator

Ebrahimi, Masood; Ahookhosh, Kaveh

doi:10.1016/j.applthermaleng.2016.04.015

Cited by 45 publications

(8 citation statements)

References 23 publications

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“…Fang et al [16] configured a complementary CCHP-ORC system for a hotel, and showed that the proposed system had a better performance than the conventional CCHP system in the area of fuel consumption, CO 2 emissions and operation costs. Ebrahimi and Ahookhosh [17] pointed out that the largest exergy destructions were the recuperator and the combustion chamber. Asouri et al [18] presented an exergo-economic analysis and optimization of a double pressure organic Rankine cycle coupled with a solar collector.…”

Section: Literaure Reviewmentioning

confidence: 99%

Thermodynamic Investigation of an Integrated Solar Combined Cycle with an ORC System

Wang

2019

Entropy

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An integrated solar combined cycle (ISCC) with a low temperature waste heat recovery system is proposed in this paper. The combined system consists of a conventional natural gas combined cycle, organic Rankine cycle and solar fields. The performance of an organic Rankine cycle subsystem as well as the overall proposed ISCC system are analyzed using organic working fluids. Besides, parameters including the pump discharge pressure, exhaust gas temperature, thermal and exergy efficiencies, unit cost of exergy for product and annual CO2-savings were considered. Results indicate that Rc318 contributes the highest exhaust gas temperature of 71.2℃, while R113 showed the lowest exhaust gas temperature of 65.89 at 800 W/m2, in the proposed ISCC system. The overall plant thermal efficiency increases rapidly with solar radiation, while the exergy efficiency appears to have a downward trend. R227ea had both the largest thermal efficiency of 58.33% and exergy efficiency of 48.09% at 800W/m2. In addition, for the organic Rankine cycle, the exergy destructions of the evaporator, turbine and condenser decreased with increasing solar radiation. The evaporator contributed the largest exergy destruction followed by the turbine, condenser and pump. Besides, according to the economic analysis, R227ea had the lowest production cost of 19.3 $/GJ.

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Section: Literaure Reviewmentioning

confidence: 99%

Thermodynamic Investigation of an Integrated Solar Combined Cycle with an ORC System

Wang

2019

Entropy

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“…The oil loop acts as the heat source of the ORC, entering the evaporator to generate vapour (1), which expands in a turbine, thereby producing useful work. Then, the fluid exhausted from the expander (2) enters the lowpressure side of the internal heat exchanger (IHE) and the fluid exhausted from the pump (5) is conveyed to the inlet of high-pressure side of the IHE, thereby transferring heat from the low pressure (2-3) to high-pressure side (5)(6). The cycle rejects heat at a low pressure in the condenser (3)(4), which is used to supply a certain heating demand (heat consumer).…”

Section: System Descriptionmentioning

confidence: 99%

“…In 2016, the total installed capacity worldwide is nearly 300 MW e [2], with an average electric efficiency range of 17-23% [3]. One of the recent research tendencies in ORCs is the development of new ORC concepts, for example the two-stage ORC with turbine bleeding [4]; but also the integration of ORCs with other technologies in order to increase their performance in comparison to conventional configurations and their stand-alone use, such as micro gas turbines [5] or solid oxide fuel cells [6].…”

Section: Introductionmentioning

confidence: 99%

Efficiency enhancement in existing biomass organic Rankine cycle plants by means of thermoelectric systems integration

Maraver

Royo

2017

Applied Thermal Engineering

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This work investigates, from a thermodynamic point of view, the possibility of integrating thermoelectric systems (TES) in existing solid biomass-fuelled ORC CHP plants in a cost-effective way. Thus, a simple plant layout was proposed. The benefits achieved in the overall plant performance, constrained by several technical parameters of the subsystems involved, are assessed in terms of the Second Law efficiency and other characteristic parameters such as the First Law efficiency and the Primary Energy Savings Ratio. The main conclusion obtained is anticipating the fact that exists a certain optimal TES driving temperature value leading to the maximisation of the plant's performance. According to the specific results extracted from the examples evaluated (TES integrated in Toluene and MDM ORC CHP plants), this temperature is about 245 • C and 210 • C, respectively, which leads to an increase in the overall Second Law efficiency of the plant up to 7-8%. Hence, it is clear that thermoelectric systems can contribute to the enhancement of the performance and to do so, there are guidelines to be considered prior to the detailed design of such systems to be integrated in existing ORC CHP plants.

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“…If the CHP is supposed to become a CCHP the cooling system will be another main component of the cycle. The power generator unit (PGU) or prime mover of a CHP system may be chosen among different types of fuel cells [6], micro steam or micro gas turbines [7], industrial large size gas turbines [8], industrial steam turbines [9] , Stirling engines [10], internal combustion engines [11] etc. Deciding about the PGU of a CHP cycle requires gathering and analyzing so much technical, economical, environmental and social data about the PGUs.…”

Section: Introductionmentioning

confidence: 99%

Designing, manufacturing and testing of a micro combined heat and power (micro-CHP) system

Ebrahimi¹,

Lahonian²,

Farhadi³

2017

KJAR

Self Cite

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Abstract:In the present paper a micro-CHP is designed, built and tested based on a 5 kW diesel engine that is chosen to recover its water jacketing and exhaust waste energy and convert it into hot water. The hot water may be used as heating source or domestic hot water. Heat recovery for the lube oil, radiation, convection, and conduction to ambient is not used since they all count for only 13% of the inlet fuel energy. The results include the main characteristics in the design section, some pictures of the main components, the temperature of exhaust, water jacketing and tap water at different points of the system. In addition the heat recovery at different engine loads is also given. The experiments and results show that the overall efficiency of the CHP system can reach 60% which means more than 30% increase of efficiency when comparing with the case when only electricity was supposed to be produced by the engine.

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Integrated energy–exergy optimization of a novel micro-CCHP cycle based on MGT–ORC and steam ejector refrigerator

Cited by 45 publications

References 23 publications

Thermodynamic Investigation of an Integrated Solar Combined Cycle with an ORC System

Thermodynamic Investigation of an Integrated Solar Combined Cycle with an ORC System

Efficiency enhancement in existing biomass organic Rankine cycle plants by means of thermoelectric systems integration

Designing, manufacturing and testing of a micro combined heat and power (micro-CHP) system

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