Computational fluid dynamics (CFD) can provide detailed information of flow motion, temperature distributions and species dispersion in buildings. However, it may take hours or days, even weeks to simulate airflow in a building by using CFD on a single central processing unit (CPU) computer. Parallel computing on a multi-CPU supercomputer or computer cluster can reduce the computing time, but t...

Whilst R290 is currently used to a limited extent in room air conditioners there desire for wider application due its excellent performance and negligible global warming potential. The product standard IEC 60335–2–40 specifies requirements limit the allowable refrigerant charge such way that it obstructs use of R290. Airflow an indoor unit can be dilute leak, enabling substantially greater quan...

The dual-airflow window could be used to conserve energy and improve indoor air quality in buildings because it works like a heat exchanger and can introduce outdoor air into buildings. In order to optimize the window design, this investigation used the orthogonal method to evaluate the importance of these 13 design parameters of the dual airflow window in energy conservation: outdoor air suppl...

In this paper, a novel analytical method was developed based on statistical energy analysis framework to evaluate sound transmission loss through ventilated windows. The proposed method was compared to numerical and analytical models available in the literature. Results showed the success and advantage of the proposed model in predicting the acoustic performance of the ventilated window and the...

Ventilated windows have shown great po tential in conserving energy in buildings and provide fresh air to improve indoor air qua lity. This paper reports our effort to use EnergyPlus to simulate the energy performance of a dual airflow window under different climate. Our investigation first develope d a network m odel to accoun t for th e twodimensional heat transfer in the window sy stem and i...

This work describes the design and experimental results of an algorithm, designed to localize a gas source in an indoor environment with no strong airflow by using an autonomous agent. This condition exacerbates the patchiness and intermittency of odor distribution, typical of turbulent flows in the presence of strong mean flows. Furthermore, no information about the wind can be used to detect ...

Appropriate ventilation in a classroom is helpful for enhancing air exchange rate and student concentration. This study focuses on the effects of fenestration in a four-story school building by performing numerical simulation of a building when considering indoor and outdoor environments simultaneously. The wind profile function embedded in PHOENICS code was set as the inlet boundary condition ...

.Abstract – This paper describes the design of a biologicallyinspired SPIRAL (Searching Pollutant Iterative Rounding ALgorithm) algorithm, for the localization of a gas source in an indoor environment with no strong airflow. Such environment shows a few aspects that make the issue of finding an odor source much harder than in the presence of a strong wind. In fact, in a windless room, the gas d...

BACKGROUND Mattress and pillow encasings are recommended for patients allergic to dust mites. Many encasements block allergen and are vapor permeable but do not allow free passage of air through the material. Recently, breathable fabrics made from tightly woven synthetic fibers or nonwoven synthetics have been recommend as encasements. OBJECTIVE The purpose of this study was to develop a meth...