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  1. Clymber

    Steam pipe thrust calculation

    Good catch. FPS is correct.
  2. Clymber

    Steam pipe thrust calculation

    I'm trying to calculate the thrust load on a 3" HPS elbow, Sch. 80, welded construction, for an underground direct-bury application. I don't typically work with steam, so I'd like a check of my numbers. This is a 3" branch pipe off an 8" HPS main at 175 PSIG. Design velocity is 5000 FPS. The...
  3. Clymber

    Greenhouse evaporative cooler design question

    We are renovating an existing greenhouse. The researchers moving into this renovated space require evaporative cooling. This greenhouse, which is divided into two 20' x 33' sections, will have a very short pad-to-fan distance (side wall to opposite side wall). Both ASHRAE and the Nat...
  4. Clymber

    Office - low airflow options

    I'm working on a revision to a dean's office at a local campus. The main air handler is a CV unit with no excess capacity. The new office layout will require additional cooling airflow than originally designed. What are my options to improve this situation? A fan-powered box would draw warm...
  5. Clymber

    Acid Digestion Hood

    I am a new facilities engineer at a local university. We have a system (designed by an outside consultant) that uses flow control valves on VAV fume hoods. The hoods are used extensively for acid digestion (boiling off hydrochloric acid, hydrofluoric acid, nitric acid, OR hydrogen peroxide)...
  6. Clymber

    Changing profiles... need help

    I recently started a new job, where the AutoCAD software defaults to "AutoCAD Architecture" instead of the plain vanilla AutoCAD (v. 2012). As I am a mechanical engineer and not an architect, I prefer the familiarity of the basic AutoCAD layout. I discovered by selecting OPTIONS -> PROFILES...
  7. Clymber

    High-pressure compressed air line materials question

    Thanks, guys. This is a military application where they fill a truck tank to 3000 PSI which runs operations on that vehicle. I think the 5000 PSI requirement includes a safety factor. The only guideline I've found lists stainless or copper-nickel pipe. I'm really curious if I can get by with...
  8. Clymber

    High-pressure compressed air line materials question

    I have a client who wants to run a 5000 PSI compressed air line around the perimeter of a shop. Airflow of 50 CFM max are expected. Can anyone direct me as to what materials may be suitable? I'm looking at a 1" Sched. 80 welded steel pipe, but I wanted to check other options. Are...
  9. Clymber

    Geothermal Well Field Calculations

    There is actually much information about these systems online. One source I would suggest is the McQuary Geothermal Heat Pump Design manual. It includes a section on boreholes and overall system design.
  10. Clymber

    Geothermal Well Field Calculations

    Your first step in an actual geothermal project should be to have a geothermal test bore drilled at the site and then have a formation thermal conductivity test performed for approximately 48 hours This will provide: 1. the formation thermal conductivity, 2. the formation thermal diffusivity...
  11. Clymber

    Duct material for Sulfuric Acid environment

    Thanks. Looks like I'd better go with FRP for the ductwork AND the outlet louver. -Brad
  12. Clymber

    Steps for Analyzing Cooling Requirement for Server Room

    You may also want to visit http://www.apc.com and browse the section entitled, "White Papers for Cooling Solutions". They have lots of good information. HTH, Brad
  13. Clymber

    Energy Modeling for LEED

    The Carrier just released a newer version of the HAP software that is geared toward LEED analysis and reporting. TRANE Trace also has that functionality and is more robust. For a small firm, the HAP software is more-reasonably priced and should serve your purpose. HTH, Brad
  14. Clymber

    Duct material for Sulfuric Acid environment

    I am designing an exhaust system for a small room (~400SF) containing a closed, dilute sulfuric acid system. Airflow is approx. 6 ACH. Is galvanized (w/high-performance paint) the cheapest option, or would a plastic duct be more chemically resistant?
  15. Clymber

    Ventilation Rates For Doctor Offices

    I just completed an HVAC design for a rural healthcare facility. In the absence of state codes and specific guidelines in 62.1, I used the Health Care Facilities guidance (ch. 7) in the 2007 ASHRAE Applications Handbook. 62.1 provided for baseline OA rates, but ASHRAE Applications, Ch. 7...
  16. Clymber

    HVAC books

    Ed, You may also want to check out "HVAC Simplified", by Kavanaugh. It provides a good overview of the basics AND comes with a CD containing of functional spreadsheets. It is available through the ASHRAE website.
  17. Clymber

    TRACE 700 Outside Air values

    I am running TRACE 700 v6.0 and am struggling to meet the ASHRAE 62.1 outside air (OA) values within my heating outputs. To correctly set the OA values, I have input the COOLING & HEATING ventilation values as the min OA values calculated using 62.1(from the CREATE ROOMS:AIRFLOWS tab). The VAV...
  18. Clymber

    ASHRAE 90.1 question

    Here's an easy one for a Friday... Can anyone tell me what the "ci" used in Table 5.5-4 means as listed after insulation R-values for Mass Walls, Above Grade? Thanks in advance.
  19. Clymber

    exhaust ducting system design

    Also see the ACGIH Industrial Ventilation Handbook. It has very detailed informationr regarding exhaust system design.
  20. Clymber

    compressed air pipe sizing

    Montemayor, If you are willing, can you post/send an example of one of your "simple" CA piping spreadsheets? I am looking for some pipe system sizing examples for a basic design. Thanks in advance!

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