Coupled Simulation of Air-conditioning System and CFD Analysis for an Office Building

摘要

The integrated energy simulation (ES) tool BEST enables comprehensive energy conservation performance evaluations and the evaluation of various energy-saving measures in Japan.However, because the indoor space is modeled with one node for every zone, there are issues in evaluating room comfort and reproducing the behavior of air-conditioning systems as well as prediction accuracy in the case of energy-saving air conditioning systems, or when the spatial distribution of physical quantities in the room covers a particularly large space.For this reason, several previous studies have been carried out on the coupled simulation of air-conditioning systems and computational fluid dynamics (CFD).In this paper, outline of coupled simulation focusing on air-conditioning system modules within BEST and CFD analysis was shown and as a case study using this technique, we carried out the analysis for an existing office building in Japan.As a results, a BEST-CFD coupled simulation made it possible to reproduce in detail the primary energy consumption of air-conditioning and other facility apparatus, along with the behavior of the indoor environment.The standalone BEST calculations could not accurately predict the transitions of heat/air between zones, a difference occurred in the processed heat volume for each zone and the behavior of the air-conditioners in comparison to the coupled simulation.The coupled simulation verified that both the indoor environment and the heat processed by air-conditioning change in response changing the region subject to air-conditioning control.