A modelling method for large-scale open spaces orientated toward coordinated control of multiple air-terminal units

Abstract

The temperature distribution is always assumed to be homogeneous in a traditional single-input-single-output (SISO) air conditioning control strategy. However, the airflow inside is more complicated and unpredictable. This study proposes a zonal temperature control strategy with a thermal coupling effect integrated for air-conditioned large-scale open spaces. The target space was split into several subzones based on the minimum controllable air terminal units in the proposed method, and each zone can be controlled to its own set-point while considering the thermal coupling effect from its adjacent zones. A numerical method resorting to computational fluid dynamics was presented to obtain the heat transfer coefficients (HTCs) under different air supply scenarios. The relationship between heat transfer coefficient and zonal temperature difference was linearized. Thus, currently available zonal models in popular software can be used to simulate the dynamic response of temperatures in large-scale indoor open spaces. Case studies showed that the introduction of HTCs across the adjacent zones was capable of enhancing the precision of temperature control of large-scale open spaces. It could satisfy the temperature requirements of different zones, improve thermal comfort and at least 11% of energy saving can be achieved by comparing with the conventional control strategy. Electronic Supplementary Material (ESM) the Appendix is available in the online version of this article at 10.1007/s12273-022-0942-8.

An Improved Zonal Ventilation Control Method of Waiting Hall of High-Speed Railway Station Based on Real-Time Occupancy

“…Even with the same airflow, differences in heat transfer may occur due to turbulence, a phenomenon known as thermal coupling. In order to accurately describe the energy exchange between adjacent zones during this process, some researchers have proposed the definition of a heat exchange coefficient that can be used to represent thermal coupling between adjacent zones [30][31][32]:…”