Spatial and Temporal Distribution of CO2 and Thermal Comfort Conditions in a Day Care Center

Finding the balance between CO2 concentration and thermal comfort is very important during the heating season in a daycare classroom due to the impact it has on children’s health. Air treatment systems together with outdoor hygrothermal conditions are decisive in finding this balance. The objective of this work is to evaluate the impact that three air treatment systems, ventilation, conditioning, and air cleaning, have on thermal comfort and CO2 concentration in the two breathing planes defined by the occupants of a daycare classroom. Eight experimental tests were carried out, using different combinations of air systems. Temperature, relative humidity, and CO2 concentration are measured at eight points in the classroom: four in the children’s breathing plane (0.75 m) and the other four in that of an adult (1.7 m). The results show, on the one hand, that the ventilation or conditioning systems improve the indoor CO2 concentration in the two planes, equalizing it in the two planes and, on the other hand, that the sensation of cold is greater in the children’s breathing plane than in the adult’s breathing plane in all the experimental tests studied采暖季中，托育教室内二氧化碳浓度与热舒适的平衡至关重要，因其直接关乎儿童健康。空气处理系统与室外热湿环境是实现该平衡的决定性因素。本研究旨在评估三种空气处理系统——通风、空调与空气净化——对托育教室内两类人员（儿童与成人）呼吸高度平面内的热舒适与二氧化碳浓度的影响。本研究共开展八组采用不同空气处理系统组合的实验测试，在教室内设置八个测点采集温度、相对湿度与二氧化碳浓度数据：其中四个测点位于儿童呼吸高度平面（0.75米），剩余四个测点位于成人呼吸高度平面（1.7米）。实验结果表明：一方面，通风或空调系统可优化两个高度平面内的室内二氧化碳浓度，使二者浓度趋于一致；另一方面，在所有受试实验中，儿童呼吸高度平面内的冷感均强于成人呼吸高度平面。