Study of waste heat recovery using phase change particles

Stefan Thynell, V. Patnaik

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1 Citation (Scopus)

Abstract

A one-dimensional model has been developed for a waste heat recovery unit that uses phase-change particles on a direct-contact heat exchange with a counter-current stream of air at high temperature. The model is based on using the conservation equations of mass, momentum and energy, which have been reduced to suitable form for numerical solution. Appropriate correlations for the drag and heat transfer coefficients have been selected from the literature for an accurate simulation of the physical situation. A standard 4th-order Runge-Kutta scheme has been applied to numerically integrate these equations to obtain the required particle and gas velocity and temperature field distributions. The numerical results obtained indicate that the use of phase-change particles has a marked advantage over regular (non phase-change) particles regarding heat exchanger effectiveness.

Original languageEnglish (US)
Pages (from-to)71-79
Number of pages9
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume129
StatePublished - 1990

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Waste heat utilization
Heat transfer coefficients
Heat exchangers
Drag
Conservation
Momentum
Temperature distribution
Gases
Air
Temperature
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

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abstract = "A one-dimensional model has been developed for a waste heat recovery unit that uses phase-change particles on a direct-contact heat exchange with a counter-current stream of air at high temperature. The model is based on using the conservation equations of mass, momentum and energy, which have been reduced to suitable form for numerical solution. Appropriate correlations for the drag and heat transfer coefficients have been selected from the literature for an accurate simulation of the physical situation. A standard 4th-order Runge-Kutta scheme has been applied to numerically integrate these equations to obtain the required particle and gas velocity and temperature field distributions. The numerical results obtained indicate that the use of phase-change particles has a marked advantage over regular (non phase-change) particles regarding heat exchanger effectiveness.",
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AB - A one-dimensional model has been developed for a waste heat recovery unit that uses phase-change particles on a direct-contact heat exchange with a counter-current stream of air at high temperature. The model is based on using the conservation equations of mass, momentum and energy, which have been reduced to suitable form for numerical solution. Appropriate correlations for the drag and heat transfer coefficients have been selected from the literature for an accurate simulation of the physical situation. A standard 4th-order Runge-Kutta scheme has been applied to numerically integrate these equations to obtain the required particle and gas velocity and temperature field distributions. The numerical results obtained indicate that the use of phase-change particles has a marked advantage over regular (non phase-change) particles regarding heat exchanger effectiveness.

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