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Theoretical modeling and optimizing design of a packaged liquid chiller
, Article 2007 ASME/JSME Thermal Engineering Summer Heat Transfer Conference, HT 2007, Vancouver, BC, 8 July 2007 through 12 July 2007 ; July , 2007 , Pages 527-537 ; 0791842746 (ISBN); 9780791842744 (ISBN) ; Kargar, S ; Sharif University of Technology
2007
Abstract
This work attempts to develop a physical simulation model for the purpose of studying the effect of various design parameters on the performance of a packaged liquid chiller. A computer model which simulates the steady-state cyclic performance of a vapor compression chiller is developed for the purpose of performing detailed physical design analysis of actual industrial chillers. The model can be used for optimizing design and for detailed energy efficiency analysis of packaged liquid chillers. The simulation model takes into account presence of all chiller components such as compressor, shell-and-tube condenser and evaporator heat exchangers, thermostatic expansion valve and connection...
Analysis and optimized design of a packaged liquid chiller (part I -Analytical modelling)
, Article 2005 ASME Summer Heat Transfer Conference, HT 2005, San Francisco, CA, 17 July 2005 through 22 July 2005 ; Volume 4 , 2005 , Pages 461-466 ; 0791847314 (ISBN); 9780791847312 (ISBN) ; Kargar, S ; Sharif University of Technology
2005
Abstract
The purpose of this work is to develop a physical simulation model for the purpose of studying the effect of various design parameters on the performance of a packaged liquid chiller. A computer model which simulates the steady-state cyclic performance of a vapor compression chiller is developed for the purpose of performing detailed physical design analysis of actual industrial chillers. The model can be used for optimizing design and for detailed energy efficiency analysis of packaged liquid chillers. The simulation model takes into account presence of all chiller components such as compressor, shell-and-tube condenser and evaporator heat exchangers, thermostatic expansion valve and...
Graphyne nanotubes: materials with ultralow phonon mean free path and strong optical phonon scattering for thermoelectric applications
, Article Journal of Physical Chemistry C ; Volume 122, Issue 39 , 2018 , Pages 22688-22698 ; 19327447 (ISSN) ; Soleimani, A ; Kargar, S ; Sundararaghavan, V ; Ramazani, A ; Sharif University of Technology
Abstract
Thermal conductivity and phonon transport properties of graphyne nanotubes (GNTs) and conventional carbon nanotubes (CNTs) are studied using nonequilibrium molecular dynamics simulations. The effect of nanotube length on the thermal conductivity and phonon transport transition from a ballistic to a diffusive regime is investigated. It is found that the thermal conductivity is significantly higher for CNTs in comparison to that of GNTs across the entire ballistic-diffusive transport range. Among GNTs, β- and γ-GNTs demonstrated the lowest and highest thermal conductivities, respectively. In addition, ultralow ballistic to diffusive transition length (4.5-7.6 nm) was observed in GNTs, which...