Energy and entropy analysis of closed adiabatic expansion based trilateral cycles

García, Ramón Ferreiro; Carril, José Carbia; Gómez, Javier; Gómez, Manuel Romero

doi:10.1016/j.enconman.2016.04.031

Cited by 21 publications

(12 citation statements)

References 32 publications

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“…The useful work depicted in Table 7 is computed in line with Eqs. (4) and (7) for which w = w n = w o + |w i |. The thermal efficiency is computed taking into account that, in all cases, the extracted heat q o is extracted without any economic cost.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…The heat balances expressed along Eqs. (1)(2)(3)(4)(5)(6)(7)(8)(9) are correct and fulfil the first law. Nevertheless, it will be shown that while single closed transformation based heat-work interaction modes cannot be refuted such as (4) and (7), obeying rigorously the first law, when dealing with thermal cycles which delivers useful work by extracting heat, Eq.…”

Section: Energy Balance Of a Closed Process Based Thermal Cycle That mentioning

confidence: 98%

“…In cooling based reverse Carnot cycle systems a large amount of work has therefore been carried out, including rotary desiccant air conditioning systems, and most report that the Carnot factor is approached or even surpassed [7][8][9][10][11][12][13]. She et al [8], therefore proposed a new energy-efficient refrigeration system sub-cooled by liquid desiccant dehumidification and evaporation.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Thermal Cycle Undergoing Adiabatic Contraction Based Work by Releasing Heat

García

2019

JENRR

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By means of observational evidence it is shown that, among the vast amount of heat-work interactions occurring in closed process based transformations, there exists the possibility of doing a transformation characterized by doing useful mechanical work by contraction based compression, while increasing the internal energy. Such thermodynamic transformation has never been considered in processes. However, in reality closed contraction based compression process are physically possible in which net work is produced by contraction of a thermal working fluid while fulfilling the fundamental laws. Thus, the objective is therefore to analyze heat-work interaction modes in closed processes conducted by heat addition, heat extracting and net work done by the process. Therefore, this analysis focuses on the feasible thermodynamic transformations contributing to the achievement of efficient closed processes based thermal cycles. The proposed cycles are characterized by performing mechanical work both in the expansion phase due to heat addition, and in the compression phase due to heat releasing. The cycles achieved are characterized by operating with closed thermal processes in which both transformations with isochoric heat addition and isochoric heat extraction are associated with useful mechanical work at high performance. The analysis of the cycle between top working temperatures ranging from 350 to 700 K while botom temperature approaches 300 K has been carried out, corroborated by experimental validation for low temperatures, in the order of 350 degrees Kelvin through a test bench designed specifically for this task. It is also worth noting that the thermal efficiency is independent of the temperature ratio. Therefore the results indicate that for lower temperatures below 690 K, the thermal efficiency of the cycle exceeds the Carnot factor, which is an efficient means of recovering residual or low-grade heat efficiently.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Energy Balance Of a Closed Process Based Thermal Cycle That mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Efficient Thermal Cycle Undergoing Adiabatic Contraction Based Work by Releasing Heat

García

2019

JENRR

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“…Recently, the trilateral flash cycle (TFC) has attracted more and more interest because of its better matching of the temperature profiles in the heater and its greater potentiality of obtaining high exergy efficiency [12][13][14][15]. Several authors showed that the TFC could have a better performance than the traditional ORC [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Influence of evaporating rate on two-phase expansion in the piston expander with cyclone separator

Wang

Zhang

et al. 2020

Therm sci

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The trilateral flash cycle shows a greater potentiality in moderate to low grade heat utilization systems due to its potentiality of obtaining high exergy efficiency, compared to the conventional thermodynamic cycles such as the organic Rankine cycles and the Kalina cycle. The main difference between the trilateral flash cycle and the conventional thermodynamic cycles is that the superheated vapor expansion process is replaced by the two-phase expansion process. The two-phase expansion process actually consists of a flashing of the inlet stream into a vapor and a liquid phase. Most simulations assume an equilibrium model with an instantaneous flashing. Yet, the experiments of pool flashing indicate that there is a flash evaporating rate. The mechanism of this process still remains unclear. In this paper, the flash evaporating rate is introduced into the model of the two-phase expansion process in the reciprocating expander with a cyclone separator. As such, the obtained results reveal the influence of evaporating rate on the efficiency of the two-phase expander.

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“…A comparison of different pure working fluids illustrated that adopting n-butane can reduce the cost of the TLC system. Ramon Ferreiro Garcia et al [28] pointed out that within a range of relatively low operating temperatures, the TLC can obtain an overall thermal efficiency at 44.9% compared to 33.9% of a Carnot cycle under the same high and low-temperature heat reservoir conditions [28]. Cipollone et al [29] conducted a thermodynamic analysis of the TLC system considering the potential to use rotary positive displacement expanders as the expansion device to achieve two-phase expansion of the TLC.…”

Section: Introductionmentioning

confidence: 99%

Investigation of an Innovative Cascade Cycle Combining a Trilateral Cycle and an Organic Rankine Cycle (TLC-ORC) for Industry or Transport Application

et al. 2018

Energies

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An innovative cascade cycle combining a trilateral cycle and an organic Rankine cycle (TLC-ORC) system is proposed in this paper. The proposed TLC-ORC system aims at obtaining better performance of temperature matching between working fluid and heat source, leading to better overall system performance than that of the conventional dual-loop ORC system. The proposed cascade cycle adopts TLC to replace the High-Temperature (HT) cycle of the conventional dual-loop ORC system. The comprehensive comparisons between the conventional dual-loop ORC and the proposed TLC-ORC system have been conducted using the first and second law analysis. Effects of evaporating temperature for HT and Low-Temperature (LT) cycle, as well as different HT and LT working fluids, are systematically investigated. The comparisons of exergy destruction and exergy efficiency of each component in the two systems have been studied. Results illustrate that the maximum net power output, thermal efficiency, and exergy efficiency of a conventional dual-loop ORC are 8.8 kW, 18.7%, and 50.0%, respectively, obtained by the system using cyclohexane as HT working fluid at THT,evap = 470 K and TLT,evap = 343 K. While for the TLC-ORC, the corresponding values are 11.8 kW, 25.0%, and 65.6%, obtained by the system using toluene as a HT working fluid at THT,evap = 470 K and TLT,evap = 343 K, which are 34.1%, 33.7%, and 31.2% higher than that of a conventional dual-loop ORC.

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Energy and entropy analysis of closed adiabatic expansion based trilateral cycles

Cited by 21 publications

References 32 publications

Efficient Thermal Cycle Undergoing Adiabatic Contraction Based Work by Releasing Heat

Efficient Thermal Cycle Undergoing Adiabatic Contraction Based Work by Releasing Heat

Influence of evaporating rate on two-phase expansion in the piston expander with cyclone separator

Investigation of an Innovative Cascade Cycle Combining a Trilateral Cycle and an Organic Rankine Cycle (TLC-ORC) for Industry or Transport Application

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