Optimization of Biomass-Fuelled Combined Cooling, Heating and Power (CCHP) Systems Integrated with Subcritical or Transcritical Organic Rankine Cycles (ORCs)

Maraver, Daniel Capitán; Quoilin, Sylvain; Royo, Javier

doi:10.3390/e16052433

Cited by 25 publications

(9 citation statements)

References 28 publications

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“…In Figure 4 4 , η ORC , η I , η II and P ESR are depicted as a percentage variation achieved by the TES integration alternative (Figure 1b) with respect to the "conventional" plant ( Figure 1a) operating in optimal conditions [26].…”

Section: Optimization Resultsmentioning

confidence: 99%

“…On the one hand, the First law efficiency tends to decrease with the raise of T 9 while, on the other hand, the Second Law efficiency (and P ESR) clearly increase. However, the performance of the system should be optimized in terms of Second Law efficiency maximization [26]. Hence, the optimal T 9 value is about 245 • C. It also shall be considered that for some very low values of T 9 the Second Law efficiency of the proposed alternative is lower than the "conventional" one.…”

Section: Optimization Resultsmentioning

confidence: 99%

“…As described in previous works [25,26], the heat transfer rate in the heat exchangers of the cycle (evaporator, condenser and IHE) and the work (expander, pump) are expressed as a function of the mass flow rate (ṁ) and the enthalpy difference. Then, the energy balance in the plant is modelled as follows.…”

Section: Model Descriptionmentioning

confidence: 99%

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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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Section: Optimization Resultsmentioning

confidence: 99%

Section: Optimization Resultsmentioning

confidence: 99%

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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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“…x x x x x [138] x x x x x [135] x x x x [139] x x x x [131] x x x x [133] x x x x [134] x x x x [132] x x x x [142] x…”

Section: Linear Programming (Lp) and Mixed-integer Linear Programmingmentioning

confidence: 99%

Optimisation studies on tri-generation: a review

Ünal¹,

Ercan

Kayakutlu

2015

Int. J. Energy Res.

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Summary Electricity, heating and cooling usage at the same time constitute an important part of primary energy consumption. Currently, intense efforts are being devoted to the improvement and development of new technologies to promote energy savings and to mitigate the global warming. Among these technologies, tri‐generation and poly‐generation systems come into prominence due to their high efficiencies, as well as low operating costs and low greenhouse gas emissions. Nevertheless, modelling and sizing these systems is a large‐sized problem itself, and the higher the number of inputs, the higher the computational complexity. This paper aims to give a comprehensive review of the optimisation techniques used in tri‐generation and poly‐generation systems modelling and optimisation. After having reviewed more than a hundred papers, taxonomy is constructed. Self‐organising map is used to cluster the reviewed studies based on the optimisation techniques. Variations of the energy resources and the outputs of implemented systems are summarised. The crowd of clusters demonstrated the widely used optimisation techniques and the gaps in research. This study will certainly pioneer the optimisation studies in the field of tri‐generation/poly‐generation applications. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Under different working conditions, the selection of working fluid has an effect on the running performances of the ORC system [19][20]. Rayegan et al [21] indicated that R245ca and R245fa are the most suitable working fluids for medium temperature heat sources.…”

Section: Introductionmentioning

confidence: 99%

Study on Mixed Working Fluids with Different Compositions in Organic Rankine Cycle (ORC) Systems for Vehicle Diesel Engines

Yang

Zhang

Wang

et al. 2014

Entropy

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Abstract:One way to increase the thermal efficiency of vehicle diesel engines is to recover waste heat by using an organic Rankine cycle (ORC) system. Tests were conducted to study the running performances of diesel engines in the whole operating range. The law of variation of the exhaust energy rate under various engine operating conditions was also analyzed. A diesel engine-ORC combined system was designed, and relevant evaluation indexes proposed. The variation of the running performances of the combined system under various engine operating conditions was investigated. R245fa and R152a were selected as the components of the mixed working fluid. Thereafter, six kinds of mixed working fluids with different compositions were presented. The effects of mixed working fluids with different compositions on the running performances of the combined system were revealed. Results show that the running performances of the combined system can be improved effectively when mass fraction R152a in the mixed working fluid is high and the engine operates with high power. For the mixed working fluid M1 (R245fa/R152a, 0.1/0.9, by mass fraction), the net power output of the combined system reaches the maximum of 34.61 kW. Output energy density of working fluid (OEDWF), waste heat recovery OPEN ACCESSEntropy 2014, 16 4770 efficiency (WHRE), and engine thermal efficiency increasing ratio (ETEIR) all reach their maximum values at 42.7 kJ/kg, 10.90%, and 11.29%, respectively.

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Optimization of Biomass-Fuelled Combined Cooling, Heating and Power (CCHP) Systems Integrated with Subcritical or Transcritical Organic Rankine Cycles (ORCs)

Cited by 25 publications

References 28 publications

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

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

Optimisation studies on tri-generation: a review

Study on Mixed Working Fluids with Different Compositions in Organic Rankine Cycle (ORC) Systems for Vehicle Diesel Engines

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