Index of ventilation effectiveness regarding energy performance considering cooling effect of air movement: Equivalent Thermal Utilization Effectiveness. (15th March 2022)

• Record Type: Journal Article
• Authors: Zhang, Sheng; Niu, Dun; Lin, Zhang
• Is Part Of: Building and environment. Volume 212(2022)
• Publication Date: 2022-03-15
• Subjects: Energy performance index -- Ventilation -- Equivalent thermal utilization effectiveness -- Cooling effect -- Air movement; Buildings -- Environmental engineering -- Periodicals; Building -- Research -- Periodicals; Constructions -- Technique de l'environnement -- Périodiques; Electronic journals; 696
• DOI: 10.1016/j.buildenv.2022.108809
• Languages: English
• ISSNs: 0360-1323

Abstract

Abstract: Indices of ventilation effectiveness regarding energy performance are required for the proper design and operation of ventilation systems. Regulations encourage ventilation systems to implement the cooling effect of air movement for energy-efficient provision of thermal comfort. However, existing energy performance indices of ventilation systems do not account for the cooling effect of air movement. This study proposes an index of ventilation effectiveness regarding energy performance, i.e., Equivalent Thermal Utilization Effectiveness (ETUE), to account for the cooling effect of air movement. The cooling effect of air movement is quantified based on the standard effective temperature and is equivalently transferred to the reduction in the air temperature of the occupied zone. The ETUE is obtained by combining the equivalent reduction in the air temperature of the occupied zone and the existing index of Thermal Utilization Effectiveness (TUE). Experiments on stratum ventilation, the representative of ventilation systems implementing the cooling effect of air movement, show that the proposed ETUE should be used instead of the existing TUE; otherwise, a low accuracy rate (0–38.5%) would occur for energy performance ranking. Moreover, the cooling effect of air movement contributes up to 86.8% to the energy performance of ventilation systems, which further demonstrates the indispensability of the proposed ETUE for accounting for the cooling effect of air movement. The proposed ETUE contributes to promoting the applications of ventilation systems with the cooling effect of air movement for the development of energy-efficient and thermally comfortable buildings. Highlights: ETUE is proposed as new energy performance index of ventilation systems. ETUE can account for cooling effect of air movement. Cooling effect of air movement should be considered for energy performance rank. Cooling effect of air movement contributes up to 86.8% to energy performance.