3.  CFD Modeling Approach for HVAC Systems Analysis

Authors: R. Mahu, F. Popescu and I.V. Ion


Abstract:

A heating, ventilation and air conditioning (HVAC) system consisting of a simplified building with one room was modelled and simulated considering both the internal and the external conditions. The numerical model was designed to concurrently take into account: (1) the internal buoyancy-driven convective heat transport, (2) the conductive heat flow through the solid walls, (3) the external convective cooling induced by the lower temperature wind, and (4) the internal and external radiative heat transfer. In order to avoid making approximations by specifying an average value for the external heat transfer coefficient (HTC), the external boundary of the numerical model was modified to include a significant external volume around the building. Thus, the flow around the building was directly simulated and the external and internal HTCs were computed on-the-fly. The coupled fluid flow thermal transfer simulation was performed to evaluate the internal environment comfort level.


Keywords: HVAC, numerical modelling & simulation, CFD, RANS

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