Abstract
Stratum ventilation shows the significant potential on energy conservation and indoor thermal comfort under cooling applications. Yet, only limited researches focus on the thermal performance of stratum ventilation under heating condition. The heating and cooling operation characteristic of stratum ventilation is different due to the distinct airflow characteristics. Therefore, this paper investigated the parameters that affect energy utilization efficiency and indoor thermal comfort under heating condition served by stratum ventilation via CFD simulations approach. The supply air parameters included temperature, airflow rate, angle, and return air outlet positions. The evaluation indicators adopt ventilation effectiveness and effective draft temperature (EDT) for assessing the energy utilization efficiency and indoor thermal comfort served by stratum ventilation under heating condition. The results demonstrated that, under the heating mode of stratum ventilation, different effects on the thermal performance were made by the mentioned parameters. The ventilation effectiveness was higher when the air supply temperature is 26°C, airflow rate is 7 air change per hour (ACH), and the air supply angle is 45°. The EDT range of the occupied zone is closest to zero K when the air supply temperature is 28°C, airflow rate is 12 (ACH), and the air supply angle is 60°. The related conclusions obtained from this study provide the theoretical basis for the stratum ventilation design and promote its heating application.
Highlights
Energy utilization efficiency and indoor thermal comfort are the main evaluation indicators for the Heating Ventilation and Air Conditioning (HVAC) system
It is reported that elevating indoor temperature in summer and decreasing indoor temperature in winter are a necessary mean in reducing the energy consumption of air conditioners
Rough the combination of experiment and numerical simulation, the impacts of supply air parameters including temperature, airflow rate, angle, and return air outlet position on the stratum ventilation thermal performance under heating condition are assessed by Et and effective draft temperature (EDT). e related conclusions obtained from this research provide the theoretical basis for the stratum ventilation design and promote its heating application
Summary
Energy utilization efficiency and indoor thermal comfort are the main evaluation indicators for the Heating Ventilation and Air Conditioning (HVAC) system. Most people are recorded to spend the most time (>85%) in the enclosed space with air conditioning, so poor indoor air quality can significantly decrease the life quality and work efficiency of building occupants [4]. Erefore, there will be an obvious difference on the operation parameters for stratum ventilation between heating and cooling conditions, causing the air supply angle to become a vital factor impacting the ventilation thermal performance for space heating [13]. Rough the combination of experiment and numerical simulation, the impacts of supply air parameters including temperature, airflow rate, angle, and return air outlet position on the stratum ventilation thermal performance under heating condition are assessed by Et and EDT. Rough the combination of experiment and numerical simulation, the impacts of supply air parameters including temperature, airflow rate, angle, and return air outlet position on the stratum ventilation thermal performance under heating condition are assessed by Et and EDT. e related conclusions obtained from this research provide the theoretical basis for the stratum ventilation design and promote its heating application
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