Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/22088
Title: Thermal comfort and energy performance of personalized ventilation with individual control of personalized air movement in the tropics
Authors: CHEN YIXING
Keywords: Human response, personalized ventilation, individual control, airflow rate, thermal comfort, energy saving
Issue Date: 19-Aug-2010
Source: CHEN YIXING (2010-08-19). Thermal comfort and energy performance of personalized ventilation with individual control of personalized air movement in the tropics. ScholarBank@NUS Repository.
Abstract: Personalized ventilation (PV) was developed to create a healthy and comfortable microenvironment with high energy efficiency. Personalized air, which is conditioned fresh air, is supplied directly to occupants? breathing zone. PV may therefore improve indoor air quality, decrease sick building syndrome symptoms, and improve occupants? thermal comfort. Moreover, PV can provide individual control of the personalized airflow rate, the airflow direction, personalized air movement and/or the personalized air temperature. However, the impacts of individual control of PV system on both thermal comfort and energy performance have yet to be studied in tropical climates. The objectives of this research are to study the subjects? behavior in operating the controls and the impacts of PV-ICA (PV provided with Individual Control of Airflow rate) system on thermal comfort and energy performance. A subjective study with 46 tropically acclimatized subjects was conducted in a field environment chamber, which was served by a desktop-mounted PV system integrated with an ambient mixing ventilation system. The subjects were provided with individual control of the personalized air movement via control of the personalized flow rate and the direction of personalized air. Human responses to the PV-ICA system were collected through questionnaires. Moreover, subjects? actions were recorded to evaluate their frequency of changes and preferred airflow rates. The data for energy calculation and simulation were recorded in building automation system (BAS) to evaluate the energy performance of the PV-ICA system. Hence, the results and observations are as follows: Subjects? behavior in operating the controls under damper opening set-point control strategy was evaluated. The results showed that when the room ambient temperature was 26 degree Celsius, the frequency of changes was lower and the preferred airflow rates were 17~31% higher compared to a room ambient temperature at 23 degree Celsius. Moreover, the subjects? preferred airflow rates had a large range, thus indicating that the preferred air movement was over a quite large range. The thermal comfort results of the PV-ICA system showed that more than 90% of subjects felt that the thermal environment was acceptable while more than 83% of subjects felt that the air movement on face, shoulder and neck were all acceptable. The acceptability of thermal comfort and air movement did not vary significantly with the room ambient temperature, PV temperature or control strategy. Moreover, at a higher room ambient temperature of 26 degree Celsius, the subjects? whole body and body segments thermal sensations were closer to neutral, which may reduce draft risk around the human body as compared to that at a room ambient temperature of 23 degree Celsius. The energy performance results of the PV-ICA system showed that when the room ambient temperature was 23 degree Celsius, the total cooling load was 9~14% higher than that at a room ambient temperature of 26 degree Celsius. In conclusion, it is found that in the tropics, the PV-ICA system can better improve occupants? thermal comfort and enhance energy saving at a room ambient temperature of 26 degree Celsius than at 23 degree Celsius. The best case is that PV-ATD supply personalized air at 20 degree Celsius and the room is maintained at 26 degree Celsius.
URI: http://scholarbank.nus.edu.sg/handle/10635/22088
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