Indoor air quality assessment: comparison of ventilation scenarios for retrofitting classrooms in a hot climate
|Author||León Rodríguez, Ángel Luis
Suárez Medina, Rafael Carlos
Calama González, Carmen María
|Department||Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)|
|Abstract||Current energy efficiency policies in buildings foster the promotion of energy retrofitting of the existing stock. In southern Spain, the most extensive public sector is that of educational buildings,which is especially ...
Current energy efficiency policies in buildings foster the promotion of energy retrofitting of the existing stock. In southern Spain, the most extensive public sector is that of educational buildings,which is especially subject to significant internal loads due to high occupancy. A large fraction of the energy retrofit strategies conducted to date have focused on energy aspects and indoor thermal comfort, repeatedly disregarding indoor air quality criteria. This research assesses indoor air qualityin a school located in the Mediterranean area, with the objective of promoting different ventilation scenarios, based on occupancy patterns and carbon dioxide levels monitored on site. Results show that manual ventilation cannot guarantee minimum indoor quality levels following current standards.A constant ventilation based on CO2 levels allows 15% more thermal comfort hours a year to bereached, compared to CO2-based optimized demand-controlled ventilation. Nevertheless, the latter ensures 35% annual energy savings, compared to a constant CO2-based ventilation, and 37% more annual energy savings over that of a constant ventilation rate of outdoor air per person.