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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Lau, Ghar Ek Timchenko, Victoria Reizes, John Fossa, Marco Yeoh, Guan Heng |
| Copyright Year | 2013 |
| Abstract | Buoyancy-driven flows in an asymmetrically heated open-ended channel which occur in façade and roof building-integrated photovoltaic systems were investigated using large-eddy simulation. The channel inclination angle was varied from 30° to 90° to the horizontal, whereas the channel height-to-width aspect ratio remained at 20. In each case, a uniform heat flux was applied along the top wall whereas the bottom wall was assumed to be adiabatic. It is shown that typical dynamics of large-scale structures in the flow and thermal fields of natural convection in the channels are successfully modeled numerically by the use of LES. The effects of varying the inclination angle on the heat transfer in the channel are explored by examining the mean flow fields and in addition, the effects of radiation have been considered. Both experimental and numerical results show that open-ended channels with low inclination angles are characterized by a low chimney effect which leads to a decreased flow rate and a delay in transition to turbulence, thereby decreasing the heat transfer coefficient and leading to higher temperatures on the heated wall. A correlation describing the local Nusselt number in the channel is also developed in order to characterize the global heat transfer behavior. |
| Sponsorship | Heat Transfer Division |
| File Format | |
| ISBN | 9780791855492 |
| DOI | 10.1115/HT2013-17400 |
| Volume Number | Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles |
| Conference Proceedings | ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology |
| Language | English |
| Publisher Date | 2013-07-14 |
| Publisher Place | Minneapolis, Minnesota, USA |
| Access Restriction | Subscribed |
| Subject Keyword | Radiation effects Temperature Turbulence Buoyancy Roofs Natural convection Flow (dynamics) Heat flux Large eddy simulation Dynamics (mechanics) Photovoltaic power systems Delays Heat transfer coefficients Heat transfer |
| Content Type | Text |
| Resource Type | Article |
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