Assessment of boiling and condensation heat transfer correlations in the modelling of plate heat exchangers

García-Cascales, J.R.; Vera-García, F.; Corberán-Salvador, J.M.; Gonzálvez-Maciá, José

doi:10.1016/j.ijrefrig.2007.01.004

Cited by 167 publications

(49 citation statements)

References 34 publications

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“…A variable pinch point has not been considered due to the high discrepancies between the experimental heat transfer correlations in the literature [40]. Besides, this assessment is out of the scope of this work.…”

Section: Systematic Optimization Resultsmentioning

confidence: 99%

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

Maraver

Quoilin

Royo

2014

Entropy

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This work is focused on the thermodynamic optimization of Organic Rankine Cycles (ORCs), coupled with absorption or adsorption cooling units, for combined cooling heating and power (CCHP) generation from biomass combustion. Results were obtained by modelling with the main aim of providing optimization guidelines for the operating conditions of these types of systems, specifically the subcritical or transcritical ORC, when integrated in a CCHP system to supply typical heating and cooling demands in the tertiary sector. The thermodynamic approach was complemented, to avoid its possible limitations, by the technological constraints of the expander, the heat exchangers and the pump of the ORC. The working fluids considered are: n-pentane, n-heptane, octamethyltrisiloxane, toluene and dodecamethylcyclohexasiloxane. In addition, the energy and environmental performance of the different optimal CCHP plants was investigated. The optimal plant from the energy and environmental point of view is the one integrated by a toluene recuperative ORC, although it is limited to a development with a turbine type expander. Also, the trigeneration plant could be developed in an energy and environmental efficient way with an n-pentane recuperative ORC and a volumetric type expander. OPEN ACCESSEntropy 2014, 16 2434

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Section: Systematic Optimization Resultsmentioning

confidence: 99%

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

Maraver

Quoilin

Royo

2014

Entropy

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“…The Nusselt number (Nu) is the ratio of convective to conductive heat transfer across the boundary, which is calculated by Equation (26) for the single-phase region [32].…”

Section: Heat Exchanger Modelmentioning

confidence: 99%

“…where β stands for the chevron angle of the plates, being expressed by [32]. Therefore, the heat transfer coefficient HTC for single-phase flow can be expressed as:…”

Section: Heat Exchanger Modelmentioning

confidence: 99%

Thermo-Economic Comparison and Parametric Optimizations among Two Compressed Air Energy Storage System Based on Kalina Cycle and ORC

Wang

Yao

et al. 2016

Energies

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Abstract:The compressed air energy storage (CAES) system, considered as one method for peaking shaving and load-levelling of the electricity system, has excellent characteristics of energy storage and utilization. However, due to the waste heat existing in compressed air during the charge stage and exhaust gas during the discharge stage, the efficient operation of the conventional CAES system has been greatly restricted. The Kalina cycle (KC) and organic Rankine cycle (ORC) have been proven to be two worthwhile technologies to fulfill the different residual heat recovery for energy systems. To capture and reuse the waste heat from the CAES system, two systems (the CAES system combined with KC and ORC, respectively) are proposed in this paper. The sensitivity analysis shows the effect of the compression ratio and the temperature of the exhaust on the system performance: the KC-CAES system can achieve more efficient operation than the ORC-CAES system under the same temperature of exhaust gas; meanwhile, the larger compression ratio can lead to the higher efficiency for the KC-CAES system than that of ORC-CAES with the constant temperature of the exhaust gas. In addition, the evolutionary multi-objective algorithm is conducted between the thermodynamic and economic performances to find the optimal parameters of the two systems. The optimum results indicate that the solutions with an exergy efficiency of around 59.74% and 53.56% are promising for KC-CAES and ORC-CAES system practical designs, respectively.

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“…So far, there are no works about steam generators using the mixture water-Carrol™. Instead, for this work, the data reported for boiling fluids in plate heat exchangers were considered [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Instantaneous Determination of Heat Transfer Coefficients in a Steam Generator for an Alternative Energy Upgrade System

Soteloa¹,

Romero²,

Best³

2009

TOREJ

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The present work shows a mathematical model to determine the thermal behavior of a steam generator in an alternative energy upgrade system. In this system, alternative energy (solar, geothermal or waste heat from an industrial process) is upgraded to a higher temperature, through a thermodynamic cycle. A plate heat exchanger is used as the steam generator, and is a key component in the system. A mixture of water-lithium bromide + ethylene glycol was used as working solution. The steam generator works with alternative energy, this is used to evaporate a part of the working solution inside the steam generator. The temperature profile and the heat transfer coefficients were obtained with type T thermocouples placed along the plate heat exchanger. The conditions that produce the highest heat transfer coefficients for the alternative energy system and the calculated heat transfer coefficients for the working solution are shown. This is the first work where a plate heat exchanger is used as a steam generator in an energy upgrade system and the first time that has been calculated the heat transfer coefficients for the working solution. There are no previous data of the use of the working solution on steam generators.

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Assessment of boiling and condensation heat transfer correlations in the modelling of plate heat exchangers

Cited by 167 publications

References 34 publications

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

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

Thermo-Economic Comparison and Parametric Optimizations among Two Compressed Air Energy Storage System Based on Kalina Cycle and ORC

Instantaneous Determination of Heat Transfer Coefficients in a Steam Generator for an Alternative Energy Upgrade System

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