A study on the relationship between energy performance and IEQ parameters in school buildings

¹ Chalmers University of Technology, Division of Building Services Engineering, Department of Architecture and Civil Engineering, SE-412 96, Göteborg, Sweden
² IVL Swedish Environmental Research Institute, P.O.Box 53021, SE-40014 Göteborg, Sweden
³ CIT Energy Management AB, SE-41288 Göteborg, Sweden

^* Corresponding author: blanka.cabovska@chalmers.se

Abstract

Over the last decades, strong focus has been placed on the energy efficiency of buildings; not least school buildings. Energy performance (EP) of buildings is nowadays in principle described by one single indicator based on purchased energy in kWh/year.m². Another important building performance aspect is the indoor environmental quality. This study’s overarching goal is to identify school buildings with a good balance between energy performance and indoor environment. Thus, this paper investigates possible correlations between information given in energy performance certificates (EPCs/e.g. energy use, year of construction, type of ventilation) and measured indoor environmental parameters. The work comprises investigation of approximately 20 school buildings with different ventilation systems in Gothenburg. In-situ investigations of the buildings’ properties and ventilation systems were conducted. Indoor environmental parameters were recorded during one week in each classroom. In this paper, indoor temperature, absolute humidity added indoors and CO₂ concentration data are compared with the corresponding school’s energy performance data and ventilation type. Results suggest that mechanically ventilated buildings have clearer relationships between energy performance, building indicators and measured indoor environment. For buildings such as naturally ventilated, the relationships are usually weak, and the values spread over much wider ranges.