Multizone modelling of a hybrid ventilated high-rise building based on full-scale measurements for predictive control

Abstract

Hybrid ventilation is an effective approach to reduce cooling energy consumption by combining natural and mechanical ventilation. Previous studies of full-scale whole-building measurements of high-rise hybrid ventilation are quite limited due to the complexities of buildings and variable ambient conditions. As a result, validated and accurate whole-building simulations of hybrid ventilation often cannot be found in the literature. This paper reports a series of full-scale measurements of hybrid ventilation in a 17-storey high-rise building and associated whole-building simulations by 15-zone detailed and a 5-zone simplified multizone models. The paper is one of the first studies of using multizone models and real-world full-scale data and sharing key operational and performance experience and case studies of high-rise hybrid ventilation. Both the test data and the validated simulation models can be used for the comparison and validation of simulation models. The 5-zone simplified model developed from this study was able to model such a complex high-rise building by only a few zones, making possible the on-line model predictive control of a high-rise building. This was illustrated in this paper by an example of optimizing the uniformity of the hybrid ventilation on different floors by modifying inlet areas.

Sustainable design of courtyard environment: From the perspectives of airborne diseases control and human health

“…Turbulent diffusion and complex vortex structure caused the non-uniform distribution of air pollutant. Occupants in rooms of the upstream building may suffer from serious airborne pollution, due to natural ventilation or envelope infiltration ( Ng et al, 2019 ; Qi, Cheng, Katal, Wang, & Athienitis, 2019 ). In courtyard environment, outdoor spaces near the upstream building should be controlled by some artificial measures (e.g.…”

New and emerging building ventilation technologies

“…Therefore, a realtime infiltration-rate-based ventilation control strategy has been proposed and evaluated. 12 Hybrid ventilation is an effective approach to reduce cooling energy consumption by combining natural and mechanical ventilation in high-rise buildings. However, most of the previous studies of full-scale whole-building measurements of high-rise hybrid ventilation are quite limited due to complexities of buildings and variable ambient conditions.…”

“…Based on full-scale measurements of hybrid ventilation, a simplified multizone model has been proposed and a case study of whole-building simulations for a 17storey institutional building was performed. 12 • Novel simulation method. Inhalation exposure to indoor particulate contaminants is one of the leading threats to public health.…”

Using CONTAM to design ventilation strategy of negative pressure isolation ward considering different height of door gaps

“…Multizone airflow models have been widely used in analysis of pressure difference, airflow, and pollutant between different rooms [ 35 , 36 ]. The multizone airflow model in CONTAM is a macro model that ignores details of rooms when calculating the pressure and air volume, it is assumed that the air in the area is well-mixed and the parameters are uniform [25] .…”