English

This paper presents the effects of façade design on crossventilation for Taiwanese elementary schools that are typically naturally ventilated. A prototype classroom that serves 30 students with divided upper and lower windows was used. Numerical simulatio

A quantitative relationship between a room’s pressurization ratio and its leakage airflows has been established in recent ASHRAE research. With this engineered approach, design of multistage pressurizations in cleanrooms and laboratories can be more predi

A stereoscopic particle image velocimetry (SPIV) system was used to measure airflow characteristics in an irregularly shaped test room. These measurements were compared with air velocity measurements obtained by a sonic anemometer instrument, hot-wire instrument, and draft instrument. All of the measurements were taken at five measurement locations along the center plane of the test room. For each measuement location, numerous pairs of SPIV, sonic, hot-wire, and draft data were collected and averaged to determine the average velocity.

This paper provides an example of a local energy code that acieves a significant energy efficiency improvement in buildings compared to ANSI/ASHRAE/IESNA Standard 90.1-1999 and describes the methodology for estimating the relative energy savings.First, the paper provides a list of key measures in the 2001 Seattle Energy Code that achieve greater energy savings than standard 90.1-1999 .

A numerical simulation with a validated CFD model of several types of buildings was used to investigate the difference between mixing (MV) and displacement ventilation (DV) under different boundary conditions.The second part of that study deals with indoor air quality.The comparison shows that DV may provide a better IAQ in the occupied zone.

In order to investigate the difference between mixing (MV) and displacement ventilation (DV) under different boundary conditions, a numerical simulation with a validated CFD model of several types of buildings was used. The comparison shows that DV can maintain a thermally comfortable environment under a very high cooling load .

Concerning house ventilation, occupants are aware of the necessity of suppressing the vicious air but less of the obligation of entering outside air. For cost savings, air-intake for ventilation is generally located on the frame of windows, but the author thinks it is wrong, it ought to be positioned either in the concrete or in the shutter coffer to get windows thermally and acoustically performant.

This paper shows how a combined air-to-air heat and energy recovery system design problem can be formulated for HVAC cabinet units and solved for the least life-cycle cost system while still retaining a small time period payback. Mathematical expressions are presented to address the complicating interaction between the components of the unit to facilitate the design process. The design process is illustrated for the city of Chicago where both large heating and cooling loads occur in HVAC applications.

An initial study to develop a numerical tool using CFD methods for investigating the potential of disease transmission in commercial aircraft is completed. To gain insight of the general airflow pattern, a detailed CFD model of a small section in the passenger cabin of a B767-300 passenger cabin was built and a Reynolds-averaged Navier-Stokes (RANS) simulation was performed. By comparing with the available test date, the RANS simulation substantially underpredicted the turbulence intensity, especially in and around the breathing zone.

An initial study to develop a numerical tool using CFD methods for investigating the potential of disease transmission in commercial aircraft is completed. To gain insight of the general airflow pattern, a detailed CFD model of a small section in the passenger cabin of a B767-300 passenger cabin was built and a Reynolds-averaged Navier-Stokes (RANS) simulation was performed. By comparing with the available test date, the RANS simulation substantially underpredicted the turbulence intensity, especially in and around the breathing zone.