Analysis on the performance of interactive cascade ventilation for space heating based on non-uniform indoor environment demand

Abstract

Seeking an energy-saving and healthy heating system is significant to realize carbon neutrality and enhance thermal comfort. In this paper, the performance of a novel ventilation mode named interactive cascade ventilation (ICV) for space heating was carried out. Stratum ventilation (SV) and mixing ventilation (MV) were selected as the reference ventilation modes. Objective and visualized experiments were employed to investigate the thermal and energy performance of the three ventilation modes. The results demonstrated that when reducing the heating capacity supply by 13.9%, the overall temperature of ICV is 4.5% and 27.9% higher than SV and MV, respectively. The comparison results of local temperature rising ratio and temperature response time demonstrated that ICV showed the most substantial ability to control the local environment and the highest energy utilization efficiency. In addition, compared with SV, ICV reduced the head draft rate by 44.8% and 24% when sitting and standing, obviously improving thermal performance. The conclusion obtained from this research can cast a new light on the space heating system.