Inter-zonal heat transfer characteristics under two typical air supply systems of stratified air conditioning in large space buildings

Combined with experiment and CFD simulation methods, this paper studies the calculation methods of interregional convective heat transfer and inter-zonal temperature difference heat transfer coefficient using floor-level side wall air supply system and sidewall nozzle air supply system, and discusses the inter-zonal heat transfer. In the scaled laboratory, the experimental cases with the same exhaust air ratio without an internal heat source are studied. According to the experimental results, the vertical temperature distribution and cooling load results obtained by CFD simulation are verified. By dividing the whole space vertically into four zones, the inter-zonal temperature difference heat transfer coefficient is obtained. The results show that the heat conduction caused by temperature gradient plays a dominant role in floor-level side wall air supply system, but for sidewall nozzle air supply system, the heat conduction caused by temperature gradient and the heat transfer caused by mass flow can not be ignored. The inter-zonal temperature difference heat transfer coefficient is influenced by supply air mode and regional division, and is related to local turbulent viscosity.