Thermal Comfort Assessment for Simultaneous Operation of Cooling and an Energy Recovery Ventilator in a Residential Building During Summer

Abstract

After the COVID-19 pandemic in South Korea, residential buildings are equipped with an energy recovery ventilator for ventilation and building energy efficiency. During summer, it is required to operate both the ERV system and air conditioners to maintain thermal comfort as well as ensure indoor air quality. The ventilation efficiency of the ERV system can be varied by various layouts of the inlet and outlet vents. Moreover, cooling can be wasted through the exhaust of the ERV system. Considering this, the present study assessed thermal comfort by applying various layouts of the supply and exhaust of ERV systems with different supply air temperatures and air volumes of the air conditioners. Using CFD (computational fluid dynamics) simulation, the ventilation and thermal performance with the PMV (predicted mean vote) were analyzed. As a result, the PMV was highly affected by the supply air temperature and ventilation flow rates of the air conditioners. While additional installations of the inlet or outlet vents showed improved ventilation performance, the PMV index presented “slightly cold” or “cold”. Considering energy saving, this proves that it can provide an opportunity to reduce cooling energy consumption through the intermittent operation mode of the air conditioners.