In the News
The American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) released a new version of its ventilation standard. The ANSI/ASHRAE Standard 62-1-2004, Ventilation for Acceptable Indoor Air Quality, incorporates 17 addenda, which were inspired by 30 years of ventilation practices as well as user input and developments in research.
The standard specifies minimum ventilation rates and indoor air quality requirements for commercial and institutional buildings. Among the major changes is the revision of the Ventilation Rate Procedure to reflect recent information regarding ventilation impacts on indoor air quality, and to clarify the adjustments necessary for space air distribution and system efficiency of multi-zone recalculating systems.
ASHRAE reports that the breathing zone ventilation rate now includes both an area related component and an occupant-density-related component. Which, added together, is used to determine the required ventilation for the space. Check out the new standard at www.ashrae.org the cost is $60 ($48 for ASHRAE members).
Also In the News is that ASHRAE may conduct seminars on how to do load calculations for residential homes utilizing software. These seminars are intended to promote the use of software to accurately size equipment for residential homes. In the past with air conditioning contractors using rule of thumb methods equipment was under sized or over sized due to improved calculation methods. Contractors using rule of thumb sizing utilized 500 square feet per ton of air conditioning or 35 btu’s per square foot in a home well shaded or 45 btu’s for a home in the sun. In some cases 50 btu’s per square foot was utilized. In all cases, it left the contractor open to litigation from homeowners when mold was found to be a problem. The use of load calculation software helps alleviate those problems associated with improper sizing in residential homes.
Also in the News is that Johnson Controls has just closed their deal to acquire York International. Nextel is merging with Sprint and their new phones will be out soon.
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