Indoor environmental quality and energy consumption real-time assessment: A field measurement of a nearly zero-energy building in cold region of China

The paper presents a two-year field measurement and assessment of a nearly zero-energy Building in cold zones of China. These parameters of indoor environment quality (IEQ) and electricity consumption for HVAC are recorded. According to the measurement data, the most of indoor temperature was controlled in the range of 23 degrees C similar to 26 degrees C and relative humidity (RH) mainly fluctuates within the range of 30% similar to 60%. The concentrations of carbon dioxide (CO2) and particulate matter (PM2.5) are lower than the relevant standard requirements in most of the time. The average electricity consumption for HVAC was 33.05kWh/(m(2).a) and the heating and cooling demands could be reduced by 55.2% and 54.0%, respectively, compared with existing buildings. In general, the NZEB can provide indoor comfortable thermal environment and indoor air quality with less energy demand, but the overheating problem in summer and effect of occupant behavior should be especially paid attention during operation. Overall, the experience from the actual operation of NZEBs will help China to reach its goals of reducing carbon emissions and addressing climate change through realizing the energy-saving potential of NZEBs. (C) 2021 Elsevier B.V. All rights reserved.