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  • Users: AbbyNormal
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  1. AbbyNormal

    Wet Bulb Globe Temperature

    WBGT seems to be the definitive value used in heat stress situations. If conditions are dangerous to work in etc. Various sources give ratings where people could work continuously as long as they are hydrated, and then as activity increases or the WBGT increases, hourly rest periods are...
  2. AbbyNormal

    Wifi Booster

    Is there such a thing on the market, sort of like a reapeater? I have a weather station in my back yard and you can access your data from the internet, it has a wifi antennea inside the main data logger housing. I know the signal coming out of my house is pretty weak over by where the weather...
  3. AbbyNormal

    HAP

    I never use this program myself. I am wondering if you can use it to check the loads over every month of the year.To look at Solar gain in cooling months otherwise not viewed as the time of peak cooling because of temperatures. Southern glass is great for passive solar heating, but in a year...
  4. AbbyNormal

    CO2 Bouyancy vs Diffusion

    Consider a gas furnace in the basement of a home. Atmospheric vent, with a draft hood. If the products of combustion were to spill would the CO2 tend to rise up to the upper levels of the home because it is hot, or would it soon cool off and collect at the floor level, stratified? Or would it...
  5. AbbyNormal

    Gell Paks

    there seem to be a lot of gells most likely mixtures of propylene glycol and water that freeze at temperatures below 32 degrees F, so you have a colder temperature source than regular ice, plus some latent heat capacity. Out of curiosity, are there commercially available gells that would change...
  6. AbbyNormal

    Cooling Towers in South Florida

    How common are they? What is a typical cost for power and water up there? How common are companies that do a decent job maintaining towers and treating the water? Take the "V" out of HVAC and you are left with a HAC(k) job.
  7. AbbyNormal

    Attics and 4-12 pitch

    Have a wood truss attic over a nursing home, 24" o/c truss spacing Looking at 15x 8 spacing option with 7 psi minimum pressure available at the head. 2002 13 handbook has an asterix stating the smallest dimension is measure perpendicular to the pitch. So it is somewhat confusing, is this 8...
  8. AbbyNormal

    AHR Expo

    Anyone going? Take the "V" out of HVAC and you are left with a HAC(k) job.
  9. AbbyNormal

    Split Face or Intertwined

    Which type of DX coil do you prefer and why? Application 2 circuit coil (2 compressors) constant volume cooling an office space handling 15 to 20% ventilation air with 80F dewpoint. One stage will always be calling, second stage will cycle on/off in occupied mode. Take the "V" out of HVAC and...
  10. AbbyNormal

    CO2 from Limestone

    Besides firing it in a kiln or soaking it with acid rain, can some other process cause crushed up limestone, seashells and marls to decompose and produce CO2? Some thing happening in nature, it sounds dumb but could these substances be baked in the sun and cause some CO2 emissions? Take the...
  11. AbbyNormal

    Measuring IAQ

    Presently I am running a lot of tests seeing how effective ventilation is, how well positive pressure helps me control humidity here in the tropics. Humidity control has been excellent, now I am focusing on the level of CO2. I had an intermittent residential ventilation strategy for cold...
  12. AbbyNormal

    Sealed Attics

    I am having good results with a sealed attic in the tropics. Roof is externally insulated about R7, and utilizes white metal above insulation to reflect the heat away. Gable walls internally insulated. Attic is unconditioned, however it is separated from the conditioned space by a mere layer...
  13. AbbyNormal

    RTAA Sound Attenuation

    Have a chiller noisier than expected. The discharge piping makes the casing and the oil separator resonate at a high pitch. Trane sells a sound deadening kit. It is not cheap, basically insulation to wrap the copressor, discharge piping, oil seperator. Anyone ever try this kit? Did it work...
  14. AbbyNormal

    How to avoid dumb HR Questions

    I am flying up to my hometown and alma mater to interview 4 grads for an EIT position with me. I don't have much use for the typical human resource interview questions, I think it will come down to which one demonstrates the most common sense and has a personality that does not grate on mine...
  15. AbbyNormal

    Fertilizer Storage

    Was doing a quick job that was just supposed to be a feed storage building, but now they are compartmentalizing off part of it to store fertilizers. Small facility to store dry fertilizers in bags. Do not know the exact chemicals to be stored, I would assume the worst would be ammonium...
  16. AbbyNormal

    Fertilizer storage

    Small facility to store dry fertilizers in bags. Do not know the exact chemicals to be stored, I would assume the worst would be ammonium nitrate. What special needs from a mechanical, electrical systems point of view. Spark proof? Change the air frequently? Take the "V" out of HVAC and...
  17. AbbyNormal

    LNG

    Curious as to what exactly it is. Just from what I have read, it sounds like it is being liquified by temperature. So with that being the case it seems to have a good chance of basically being pure methane. Take the "V" out of HVAC and you are left with a HAC(k) job.
  18. AbbyNormal

    Definition of Overfired

    I see a lot of heated debates on the various forums involving the correct firing rate of natural gas appliances. The residential and light commercial furnaces will have a label stating an input and a rated output. The heat content of natural gas can fluctuate from one region to another, as...

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