In 2001, the Texas State Senate passed Senate Bill 5 to reduce ozone levels by encouraging the reduction of emissions of NOx that were not regulated by the Texas Natural Resource Conservation Commission. These include point sources (power plants), area sources (such as residential emissions), road mobile sources, and non-road mobile sources. For the building energy sector, the Texas State Legis...

About the Author John E. Janssen chaired Standards Project Committee (SPC) 62, which developed ANSI/ASHRAE Standard 62–1989, Ventilation for Acceptable Indoor Air Qualtiy and also served on the SPC that wrote Standard 62–1981. Until his retirement, he was a principal research fellow at Honeywell. Janssen has authored several Journal articles, including “The V in ASHRAE, An Historical Perspectiv...

OBJECTIVE To describe the role of the tobacco industry in the development of ventilation standards for indoor air quality by influencing the American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE). METHODS Review of tobacco industry documents available on the internet between January 2001 and March 2002. Search terms included "ASHRAE", "ventilation", "minutes", "me...

The purpose of ventilation is to dilute or remove indoor contaminants that an occupant could be exposed to. It can be provided by mechanical or natural means. ASHRAE Standards including standards 62, 119, and 136 have all considered the contribution of infiltration in various ways, using methods and data from 20 years ago. The vast majority of homes in the United States and indeed the world are...

This posting is by permission of ASHRAE and is presented for educational purposes only. ASHRAE does not endorse or recommend commercial products or services. This paper may not be copied and/or distributed electronically or in paper form without permission of ASHRAE. Contact ASHRAE at www.ashrae.org.

Field experiments, conducted in 29 air-conditioned offices, used survey questionnaires and physical measurements to investigate workers’ subjective thermal responses and comfort perception. A total of 650 individuals participated in the field study. The thermal neutrality and thermal preference of subjects occurred at 25.6°C and 24.1°C respectively. Responses from those subjects suggest a comfo...

In the present work the efficiency of a solar parabolic trough has been investigated experimentality. parabolic trough solar collector constitute a proven source of thermal energy for industrial process heat and power genaration. The impact of  using the partially porous media in the absorber on the efficiency of PTC (parabolic trough collector) has been investigated. The porosity of copper foa...