论文信息 - A study of a control strategy utilizing outdoor air to reduce the wintertime carbon dioxide levels in a typical Taiwanese bedroom

A study of a control strategy utilizing outdoor air to reduce the wintertime carbon dioxide levels in a typical Taiwanese bedroom

Abstract A CO 2 concentration of more than 1000 ppm has been monitored in Taiwanese bedrooms during sleeping hours in the wintertime. The high indoor CO 2 levels were caused by poor ventilation due to insufficient ventilation rates. This study sought to reduce the wintertime CO 2 concentration level in a typical Taiwanese bedroom with less outdoor air to maintain thermal comfort. CO 2 was used as an indicator to assess whether an adequate ventilation rate has been obtained to dilute or remove harmful pollutants. With the help of the thermal buoyancy effect, the CO 2 generated in the bedroom was effectively removed by means of less outdoor air. Through computational fluid dynamics simulations, the appropriate window and transom locations with the corresponding outdoor air supply volume, as well as the lowest possible outdoor air temperature were identified.

[1] M. Liddament,et al. A guide to energy efficient ventilation , 1996 .

[2] B. Launder,et al. The numerical computation of turbulent flows , 1990 .

[3] L. Davidson. Ventilation by displacement in a three-dimensional room— A numerical study , 1989 .

[4] S. Orszag,et al. Development of turbulence models for shear flows by a double expansion technique , 1992 .

[5] Arsen Krikor Melikov,et al. Airflow characteristics in the occupied zone of rooms with displacement ventilation , 1990 .

[6] M. Sandberg. What is ventilation efficiency , 1981 .

[7] Chen Qingyan,et al. Measurements and computations of ventilation efficiency and temperature efficiency in a ventilated room , 1988 .

[8] Hazim B. Awbi,et al. Application of computational fluid dynamics in room ventilation , 1989 .

[9] P. Fanger,et al. Air turbulence and sensation of draught , 1988 .

[10] M. Malin,et al. Calculation of turbulent buoyant plumes with a Reynolds stress and heat flux transport closure , 1990 .