Abstract
In building energy simulations, the air infiltration and interzonal airflow are generally either not considered or calculated oversimplified. However, the effects of air infiltration and building airflow have an impact on the thermal comfort and the building’s energy load. The various zones in multi-zone buildings, the operation of windows, doors and mechanical ventilation make the system’s analysis complex and challenging. Building airflow affects pressure, temperature and moisture differences. Therefore, this study investigate the airflow inside a multizone building with changing user behavior, using a coupled building and system energy simulation. A decentralized air-only HVAC system provides the ventilation system with a control strategy, which variably adapts the airflow to the load in the individual zones. The effects of the air infiltration, interzonal airflow and mechanical ventilation in the building are investigated with a node and link network in TRNSYS using the airflow model TRNFLOW (COMIS). Investigating different variations of the ventilation rates and building’s airtightnesses, the results are shown by comparison with a reference model without airflow simulation. Finally, this study shows a comprehensive approach at low computational costs, determining the air quality, the thermal conditions and the airflow in a multizone building using an HVAC system.
Highlights
Due to internal and external thermal loads, a heating or cooling demand usually occurs in a building zone
The airflow model calculates the infiltration and interzonal airflow depending on the interior and exterior conditions of the building, which are taken into account in the thermal balance, given by Equation (1)
It is assumed that, as in usual building energy simulations applied, no interzonal air exchange occurs between the zones and a standard value of n = inf 0.1 1/h is assumed for the air exchange due to infiltration
Summary
Due to internal and external thermal loads, a heating or cooling demand usually occurs in a building zone. It is assumed that, as in usual building energy simulations applied, no interzonal air exchange occurs between the zones and a standard value of n = inf 0.1 1/h is assumed for the air exchange due to infiltration. #=34 0
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