Indoor Air Quality Assessment in a Classroom Using a Heat Recovery Ventilation Unit

摘要

The air quality inside buildings is a major problem in EU countries because of lack of any source of fresh air. The situation is even more dramatic in schools were many individuals breathe the same air for multiple hours a day increasing the risk of illness and reduced mental performances. Finding a solution for existing buildings is a challenging task as numerous factors must be considered: noise, weight of the system, required air flow, energy efficiency, costs, maintenance, etc . The present study reports on the analysis of a novel heat recovery ventilation unit inside a high school classroom. The analysis consists of measurement of the indoor environment quality especially on the Radon concentrations and COSUB2/SUB level for one week. The polluted air is evacuated while a heat recovery ventilator introduces the fresh non-polluted air. This decentralized system is for the first time studied in the literature as most of the studies were focused on centralized systems for new buildings. If before the system installation the COSUB2/SUB levels were very high ( 2500 ' 2500 2500 2500 ppm) and the Radon concentrations medium ( 150 ' 150 150 150 Bq ⋅ ' ? ? cdot m − 3 ' ? 3 ? 3 ^{-3} ) at the end of the measurements it has been proven to be a perfect solution to reduce the indoor pollution.