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  1. jkauwale

    Crawl Space Ventilation

    1) Ventilation requirements are the responsibility of the mechanical engineer. 2) Code requirements for ventilation are typically based on occupancy (reducing CO2) in the space or they are based on limiting some other contaminant concentration (like noxious fumes, flammable gases, etc.)...
  2. jkauwale

    Duct Collection System

    Hi Remp, The primary method of sizing ducting serving a dust collection system is to maintain a certain minimum velocity through the duct. This velocity will allow the particles to be suspended in the air and it will also allow the particles to be transported to the collector. The minimum...
  3. jkauwale

    Code Requirements for Air Handling Units

    You should also read the section of NFPA 90 about units above 15,000 CFM. Justin K, P.E. http://www.engproguides.com
  4. jkauwale

    Hvac Design Proposal Documents

    There are four pieces that are typically submitted to the client: 1. Drawings: Full size drawings, hard copies, electronic, sufficient amount to send out to bid, permit or review. 2. Specifications: Complete specifications, same amount of copies to match the drawings, typically. 3. Cost...
  5. jkauwale

    Blower motor amperage draw

    Hi kbs, you should take a look at the fan curve of your fan. At various operating points, the fan's efficiency and therefore power usage may change. How much it will change is dependent on your fan. Justin K, P.E. http://www.engproguides.com
  6. jkauwale

    Moisture content of cool air at supply air diffuser in room!

    Your colleague is correct. It might be helpful to grab a psychrometric chart and plot the points of your air conditioning process. For example, plot (1) incoming AHU conditions, (2) leaving AHU conditions, (3) space conditions. When your air leaves the AHU and travels the length of duct...
  7. jkauwale

    FE/PE Exams

    I know several professional engineers who have taken the PE exam and passed the exam in the discipline that they work in, which was not the discipline that they majored in college. The PE exam tests your ability to practice engineering, so don't be too worried about the fact that you did not...
  8. jkauwale

    Excessive building negative pressure

    I don't have your AHU and EF capacities and ESP values, can you send those? But it seems like when both your AHU and EF are on, your EF is exhausting the air that is being supplied by your AHU and your relief dampers are not being used. It also seems like your EF is much larger than your AHU...
  9. jkauwale

    Chiller Vs Boiler

    Absorption chillers are typically more expensive and are only used when you have large amounts of waste heat available. But as everyone has said before...you should conduct a life cycle cost analysis. Justin K, P.E. http://www.engproguides.com
  10. jkauwale

    Parking Garage Ventilation

    Yes, I have used the same means on a recent parking garage project. Justin K, P.E. http://www.engproguides.com
  11. jkauwale

    4 Story TH with a Pump

    In this type of situation, you don't have much options. I've gone through a similar type situation for a small school and needed to put in a fire pump and a tank (insufficient pressure and flow). Justin K, P.E. http://www.engproguides.com
  12. jkauwale

    Hi Guys, Presently, I am designing

    At 600 tons of cooling, it is typically recommended to use a water cooled plant. Justin K, P.E. http://www.engproguides.com
  13. jkauwale

    Sizing an HVAC unit for commercial building

    Use a load calculation program to properly size your HVAC system. I use Trane Trace 700 but there are others out there. Justin K, P.E. http://www.engproguides.com
  14. jkauwale

    PROCEDURE FOR PRESSURE TESTING?

    I am not sure of a rule of thumb for calculating total friction loss as function of the number of floors. Pressure loss due to elevation - 2.31 feet equals 1 PSI. There is a rule of thumb to estimate friction loss. Typically you take your system length, multiply by 1.5 (for fittings), then...
  15. jkauwale

    VAV system

    Since you are doing a government building, I am sure that you are familiar with the UFC requirements for anti-terrorism, http://www.wbdg.org/ccb/DOD/UFC/ufc_4_010_01.pdf I am not sure why you need to provide high amounts of exhaust air for your government building? Why does this building need...
  16. jkauwale

    exhaust fan sizing for cooling

    Yes, if you have no windows, then I believe you are correct. The only thing I could see is if you have a thin metal building, that had a surface temperature greater than 104 F due to solar radiation. Is that possible? What kind of construction do you have? Justin K, P.E...
  17. jkauwale

    PROCEDURE FOR PRESSURE TESTING?

    If you want to calculate the pressure throughout the chilled water piping system, then you will need your pump head calculation (friction loss) and pressure at expansion tank. Start at the expansion tank (typically this is at the suction side of your chilled water pump). Let's say your...
  18. jkauwale

    exhaust fan sizing for cooling

    Hi swoosh172. Your approach of installing an exhaust fan, in order to maintain space temperatures suitable for the equipment in an electrical room is a common and sound design approach. With regards to the sizing of the exhaust fan, you will not need to account for the heat load due to...
  19. jkauwale

    Best Energy Audit Book

    Hi. I would suggest the Handbook of Energy Audits as a starter, see below. http://www.aeeprograms.com/store/detail.cfm?id=673&category_id=6 The AEE website also has a bunch of other books on Energy Management that may interest you. I have the Energy Management Handbook and the Handbook of...
  20. jkauwale

    Required Air Flow for Cooling

    All of the major generator manufacturer's have design guides that discuss the required airflow for generator rooms. This is the best place to start: Caterpillar: http://www.cat.com/cda/files/3375314/7/Engine Cummins...

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