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  1. AbbyNormal

    Complete Heat Gain Analysis of Motor / Pump

    or even to a flow and temperature rise measurement across the pumps to get the heat into the water. The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  2. AbbyNormal

    Complete Heat Gain Analysis of Motor / Pump

    Power needed to move the water in horsepower GPM x ht of head x specific gravity / ( 3960 x impeller efficiency) Probably if you could measure the power draw into the pumps, you could break out the heat into the water with that estimation and the reminder of the heat goes to the air. The way...
  3. AbbyNormal

    Cooling large Machine Shop in KSA

    East sounds like adjacent to the Persian gulf, about the most humid place in the world. I would work out the required ventialtion rate and come up with an outside air unit to cool air down to 55 and blow it into the space. If you are seriously considering cooling the whole place down you have...
  4. AbbyNormal

    Designing Water Cooled Chiller w/ Heat Recovery

    Must be for a resort in Puerto Rico The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  5. AbbyNormal

    Dehumidification with cooling coils only

    I use chilled water air handlers with a built in DX dehumidifacation and condenser coil for reheat from time to time. Night clubs, surgical suites The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  6. AbbyNormal

    Dehumidification with cooling coils only

    To control temperature in a space, you have to supply air to the space cooler than what you want to maintain the room at. Likewsie to control humidity in a space, you have to supply air to the space with a dew point lower than the dew point that you wish to maintain in the space. The way we...
  7. AbbyNormal

    Dehumidification with cooling coils only

    work out the dewpoint needed in that room where you want the 40% RH. An example at sea level then could be maintaining 75F @ 40% RH. This is a dew point of 49F. The air off of the cooling coil will need a dew point lower than 49 by the amount that the internal latent load calls for. Perhaps...
  8. AbbyNormal

    Expanded Sheetmetal Resistance to Airflow

    I would carry the velocity head of the free area through the openings as the pressure drop and call it a day. The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  9. AbbyNormal

    Dehumidification with cooling coils only

    if it is a clean room you have a high volume of air probably 20 air changes an hour for filtration purposes. This volume of air is probably a lot more than you would normally need for space cooling. You have to have the supply air with a lower dew point than what you need to maintain in the...
  10. AbbyNormal

    Dehumidification with cooling coils only

    Investigate reheating the air The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  11. AbbyNormal

    how do I recognize that the coil had been e-coated?

    electrofin? problem was a lack of longevity when applied primarily to any carrier product The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  12. AbbyNormal

    how do I recognize that the coil had been e-coated?

    I cannot say I have been impressed with the electro-fin performance The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  13. AbbyNormal

    Make-up Air For Fume Hood

    get an inline fan, a good filter and an electric duct heater for the winter. An SCR controller on the duct heater will be a simple way to get the air tempered up to whatever temperature you want. The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any...
  14. AbbyNormal

    how do I recognize that the coil had been e-coated?

    First of all, I have zero confidence in any field applied coating, may give you a year longer life than no coating at all. Factory applied coatings are much better. It is going to depend on the type of coating being used. "e-coat" sounds like carrier lingo and a few years back they were...
  15. AbbyNormal

    Blower Motor Heat (net effect on cooling capacity)

    On commercial equipment, 2 degrees of reheat from the fan is not uncommon on a draw through application.I have measured over three degrees ocurring also. So when a coil is cooling air by 20 degrees, 2 to 3 degrees of fan reheat robs you of 10% to 15% of your sensible cooling on a draw through...
  16. AbbyNormal

    Blower Motor Heat (net effect on cooling capacity)

    My load program uses the following to estimate fan heat Fan Heat (deg F) = 0.363 x (total fan static "WC)/ Eff The efficiency is the motor efficiency times the fan efficiency So for a residential unit, perhaps the fan sees an inch of total static and assuming the product of the fan efficiency...
  17. AbbyNormal

    Blower Motor Heat (net effect on cooling capacity)

    blow through fans heat the return air up draw through fans reheat the air off of the coil. without going through the math, I would say on a residential system you could have about 1/2 a degree of fan heat The way we build has a far greater impact on our comfort, energy consumption and IAQ...
  18. AbbyNormal

    Linked-In

    we were members of some similar groups. If we were not then linkedin would have asked me for your email address I believe The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install
  19. AbbyNormal

    Linked-In

    Without knowing your email address Chris, I would think the people here would just have to be a member of one of the same LinkedIn groups as you to be abloe to send you an invite to connect The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC...
  20. AbbyNormal

    Ventilation Rate: Mechanical Room

    soiled linen room would be about 10 air changes an hour The way we build has a far greater impact on our comfort, energy consumption and IAQ, than any HVAC system we install

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