Intermittent operation

This study analyzed the effect of intermittent operation of ventilation system on changes of indoor air pollutants' levels through field measurements. The changes of indoor air pollutants' levels, such as, CO2, PM10, TVOCs, and HCHO were monitored during 24 hours at each ventilation condition. One group was the operation time: 2 hours, 8hours, and 24 hours. The other group was the changes of start time of ventilation, before noon, after noon, and night, while the ventilation was operated only two hours.

Heat transfer between soil and cooling water in buried pipes is presented, thus ground source heatpump can realize the transfer from low-grade energy to high-grade energy. We tested Watertemperature and flow rate of the buried pipe of Ground source heat pump system under intermittentoperation condition in Qingdao, temperature field of vertical buried double-U pipes is analyzed bythree-dimensional numerical model.