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  1. rworthen

    return vs relief fan

    I remember reading two I think in the last 3 years in the ASHRAE journal but I don't recall the exact issues. Usually the argument made is that return fans make controlling the minimum outside air difficult especially with VAV systems. As I recall the argument goes like this: in the mixed air...
  2. rworthen

    Books recommendation, ideas?

    If I had to rely on just one book I think I would choose "Piping Handbook" edited by Mohinder Nayyar. Published by McGraw Hill. It includes discussion of just about every topic you might need.
  3. rworthen

    Cold Corner Office

    First. I don't understand the 65 SqFt if the room is 19.5 ft by 12.95 ft. Also you neglect to mention the ceiling but if you assume it is a heated second floor, the capacity of the system seems large enough. Here are some possibilities. 1. With a coil capacity of 8250 Btu/Hr, and 200 CFM...
  4. rworthen

    high eff. gas furnaces

    Actually these are quite common. Trane, Carrier, DayNight and several others make residential gas furnaces of 90% efficiency or higher. Usually they are sealed combustion units and require a condensate drain. They all come with cooling options but that cycle efficiency is of course, usually...
  5. rworthen

    Duct sizing Program

    Trane has a program called Vari Trane Duct Designer. It runs about $500.00 for a single use license. Contact Trane. They may be willing to provide a demo version before you buy it. I haven't used it myself but I know it is the heart of one of the automated CAD design packages put out by...
  6. rworthen

    Energy Efficient HVAC design

    The us Dept of energy has a good site www.eren.doe.gov. I am not sure what CFD refers to. The us Air Force publishes a Manual on Variable Frequency Drives and Energy Efficient Motors which is excelent. It is free to down load at http://afpubs.hq.af.mil Also try the Army Corps of Engineers for...
  7. rworthen

    ASHRAE Vs. International codes

    Goorah ASHRAE and IES jointly published STd 90.1 in 1989 and this standard was adopted as part of the Energy Policy Act. 10 CFR 435. It has since had two updates, one in 1999 and current version 2001. I understand that the 2001 version is being included into the new Federal energy document...
  8. rworthen

    Civil needs basin HVAC knowledge

    Andrew, Would you be comfortable recommending "Structural Design for Dummies"? Since you said you were in project management I assume you are looking for some understanding of HVAC systems and how they work, so you don't feel quite so over-your-head on a construction site. ASHRAE is...

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