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  • Users: sauba
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  1. sauba

    Natural Gas Piping Pressure Drop

    I have a problem I would like a sanity check on if anyone has a few minutes. I have a natural gas system designed for about 3" W.C. of pressure drop from the meter/regulator to the most remote burner. The system is approximately 1000 total equivalent feet. The total load at the meter is 10000...
  2. sauba

    Medical Air vs. Breathing Air

    I am having a hard time figuring out what the difference is in Medical Air and Breathing Air. From what I can tell, Medical Air systems must meet the requirements of NFPA 99, but the quality of the air is the same as OSHA Grade D breathing air. Is this correct?
  3. sauba

    HVAC Annual Maintenance Cost Estimates

    Anyone know of a good source for HVAC annual maintenace cost estimates based on system type, either per ft^2 or ton? Thanks
  4. sauba

    Maximum Leaving Air Temperature

    What is generally the maximum leaving air temperature for VAV system with ceiling diffusers? I have seen temperatures ranging from 85 to 110 degrees. What is the most commonly accepted method for lowering this temperature and achieve desired heating? Are minimum airflows generally increased...
  5. sauba

    Peak Demand Calculation

    I am trying to calculate the peak demand in amps to a space. The utility company has informed me that the max reading to the space in a 15 minute period was 29.7 kWh. If i have 120/208 V service to the space, am I correct in calculating this as: I=kWh/(V*T)=29.7*1000/(.25*208*SQRT(3))= 329.76...

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