Design Sensitivity Analysis of a Plate-Finned Air-Cooled Condenser for Low-Temperature Organic Rankine Cycles

Kaya, Alihan; Lazova, Marija; Bağcı, Özer; Lecompte, Steven; Ameel, Bernd; Paepe, Michel De

doi:10.1080/01457632.2016.1216966

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…The corresponding governing equations are presented in this section. For a steady state conservation of energy and charge of a solid thermoelectric material with temperature independent material properties, the governing equations can be expressed as [24] (1) (2) with the electric field intensity vector ( ) and electric current density vector ( ) given as 3) (4Here, the variables T and φ are the resulting fields of temperature and the electric scalar potential, respectively. The coefficients α, k, σ represent the material properties, i.e.…”

Section: Validation Of Extended Solver Tegfoammentioning

confidence: 99%

“…It is nearly impossible to recover this kind of waste heat with conventional heat to electricity conversion systems, like steam or gas turbines. A conversion process which can deal with low-grade waste heat is the Organic Rankine Cycle (ORC) [1][2][3], but it is rather complex and the involved turbine contain rotary parts [4] which, in general, needs a high-maintenance effort. The thermoelectric generator (TEG) is a waste heat recovery system, which doesn't contain rotary parts and, thus, needs a low maintenance effort.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

2018

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Designs of heat exchangers are quite often disconnected to the performance of thermoelectric generators (TEG). In this work, the TEG and the heat exchanger are numerical modelled simultaneously in a computational fluid dynamics (CFD) environment (OpenFOAM) to maximize the output power of the system while minimize the hydraulic power required. A preliminary work was done where the modelling of the heat exchanger, a single laminar slot jet, and the modelling of a 16 element TEG are validated. The considered heat exchanger is a laminar slot jet consists of a linear array of discrete heat sources which accord with the geometry of a thermoelectric generator. The considered 16 element TEG is modelled using the temperature dependent material properties which require a solution of a system of nonlinear differential equations, namely the conservation of energy and the conservation of electric current. The conjugate heat transfer OpenFOAM solver chtMultiRegionFoam is extended by an additional differential equation for the solid region to model the conservation of current. The conservation of energy is expanded by additional source terms based on Peltier/Thomson effect and Joule heat. To simplify the calculation, interface and 1D resistor load boundary conditions are developed and implemented. The heat exchanger and the TEG model, both, are validated by comparisons with measurements, where a good agreement is observed.

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Section: Validation Of Extended Solver Tegfoammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

2018

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“…A conversion process which can deal with low-grade waste heat is the Organic Rankine Cycle (ORC) [1][2][3], but it is rather complex and involves turbines containing rotary parts [4][5][6], which, in general, needs a highmaintenance effort.…”

Section: Introductionmentioning

confidence: 99%

Variable temperature effects on TEG performance

et al. 2019

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The present paper presents an experimental investigation of the variable temperature effects on the performance of a Thermoelectric Generator (TEG). In the conducted experiments, a sample TEG is analyzed by imposing variable temperature patterns on the cold side, while keeping the temperature uniformon the hot side. The achieved local temperature variations on the cold side has approximately been about 8% of the temperature difference between the hot and cold sides. The results reveal that the TEG performance shows some variation with the applied variable temperature patterns, which remains, however,rather small for the applied temperature variations. For achieving a more clear answer to the present question, further experiments need to be designed where more substantial temperature variations canbeobtained.

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“…In literature a large variety of heat transfer correlations exist [6,7,8,9]. Each correlation is based on experimental data within a certain range of working conditions.…”

Section: Introductionmentioning

confidence: 99%

Flow regime based heat transfer correlation for R245fa in a 3 mm tube

Billiet

Ameel

Charnay

et al. 2018

International Journal of Heat and Mass Transfer

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241 heat transfer measurements for R254fa were conducted. The heat transfer coefficient was determined for a smooth stainless steel tube with an inner tube diameter of 3 mm. The experiments were conducted for five mass fluxes (100, 300, 500, 700 and 1000 kg/(m 2 ·s)), three heat fluxes (10, 30 and 50 W/m 2 ) and at three saturation temperatures (40 • C, 70 • C and 125 • C). The experiments were used to determine the influence of the saturation temperature, mass flux, heat flux, vapour quality and flow regime on the heat transfer coefficient.At a low saturation temperature, the heat transfer coefficient increases with an increasing mass flux. However, at a high saturation temperature the heat transfer coefficient decreases with an increasing mass flux. Furthermore, the heat transfer coefficient increases with increasing vapour quality at a low saturation temperature. On the contrary, the heat transfer coefficient decreases at higher saturation temperatures.Due to the fact that most heat transfer models found in literature are developed for low saturation temperatures and one flow regime, the heat transfer coefficients predicted by the existing models do not comply very well with the experimental data. Thus, a new heat transfer correlation for R254fa was proposed. The new correlation has a Mean Absolute Error of 11.7% for the experimental data of a tube with an inner tube diameter of 3 mm. Finally, this new correlation was also verified with R245fa datasets of other authors.

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Design Sensitivity Analysis of a Plate-Finned Air-Cooled Condenser for Low-Temperature Organic Rankine Cycles

Cited by 12 publications

References 35 publications

Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

Variable temperature effects on TEG performance

Flow regime based heat transfer correlation for R245fa in a 3 mm tube

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Design Sensitivity Analysis of a Plate-Finned Air-Cooled Condenser for Low-Temperature Organic Rankine Cycles

Cited by 12 publications

References 35 publications

Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

Variable temperature effects on TEG performance

Flow regime based heat transfer correlation for R245fa in a 3 mm tube

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Product

Resources

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Flow regime based heat transfer correlation for R245fa in a 3 mm tube