RT journal article
T1 New natural convection heat transfer correlations in enclosures for building performance simulation
A1 Rincón Casado, Alejandro
A1 Sánchez de la Flor, Francisco José
A1 Chacón Vera, E.
A1 Sánchez Ramos, José
A2 Ingeniería Mecánica y Diseño Industrial
K1 Natural convection
K1 turbulent natural convection
K1 computational fluid dynamic
K1 square cavity
K1 Indoor heat transfer coefficient
K1 enclosures turbulent regime
AB This paper presents new correlations to calculate natural convection heat transfer coefficients (CHTC) in enclosures for building performance simulation. Current work related to the development of correlations is not oriented to building enclosures, and the influence of high numbers of Rayleigh (Ra) and aspect ratio on the CHTC has not been studied in detail. In this work, two new correlations have been developed for a vertical wall, one in laminar regime (Ra < 107) and another one in turbulent regime (107<Ra<1011). Moreover, two new correlations have been developed for floor and ceiling, one in laminar regime (Ra < 106) and another one in turbulent regime (Ra > 106). All correlations have been developed as function of the aspect ratio (H/L) and Ra numbers calculated from the enclosure average air temperature and wall surface temperature. By contrast, in previous works the Ra numbers have been calculated from the temperature difference of opposite walls. Computer Fluid Dynamics (CFD) simulations for different aspect ratios (H/L = 0.5–1–2) and Ra numbers (103–1011) have been carried out in order to obtain these correlations. The SIMPLE algorithm has been used for the solution of the Navier–Stokes equations and the realizable turbulence k-ε model with an enhanced wall-function treatment has been used. The correlations developed follow the expected trend for the low number of Ra in comparison with the expressions developed by other authors. For a high number of Ra, our correlations improve the previous correlations, because it is a function of the aspect ratio of the enclosure and the average air temperature of the enclosure. This approach is simple to implement in the construction of thermal simulation programs with low computational cost
PB Taylor
SN 1997-003X
YR 2017
FD 2017-03-21
LK http://hdl.handle.net/10498/30815
UL http://hdl.handle.net/10498/30815
LA eng
NO MTM2012-36124-C02-00 funded byNational Plan for Science Technology and Innovation (Spain)
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026