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  1. Replies
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    A 100 sq ft x 10 ft ceiling bathroom at 72F with...

    A 100 sq ft x 10 ft ceiling bathroom at 72F with 95% humidity can hold about .038 gallons of water in the air.

    Mix this water vapor with the rest of a 900 sq ft home at 72F with 20% humidity(.30...
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    626

    Any brand OAT sensor placement is not easy for...

    Any brand OAT sensor placement is not easy for any accurate OAT. Anything near a solar heat source is obviously inaccurate. Even being near a wall can be inaccurate even in the shade, because the...
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    1,471

    People always wanting to destroy things and take...

    People always wanting to destroy things and take the unethical approach.

    What I would do is build a heat exchanger around that frozen line and keep it warmer with my interior air.
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    1,067

    I see a few aerodynamic issues here. The 16 x 25...

    I see a few aerodynamic issues here. The 16 x 25 diagonal filter in a corner doesn't give you the airflow charactersitics of an 16 x 25 filter. The resulting airflow is much less significant on the...
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    2,239

    But will the trailer be air conditioned??? ...

    But will the trailer be air conditioned???

    Most potential customers may appreciate the visual aids and hands on as an educational tool, but after that, what's going to keep them from taking this...
  6. Every time your AC shuts off, the humidity in...

    Every time your AC shuts off, the humidity in your home starts to creep up due to infiltration. If a two speed is well sized & designed for your home, the system will shut off less (and not at all...
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    904

    The KWH to electric bill cost calculation is not...

    The KWH to electric bill cost calculation is not as easy as KWH cost * KWh of equipment. Your home probably has two 120 VAC phases and if your load is not balanced between the phases you pay per the...
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    1,507

    Do you have flex duct with Y's? If so, the...

    Do you have flex duct with Y's? If so, the problem isn't an airflow restriction caused by the Y's. His suggestion about converting over to ductboard boxes sounds like a preliminary (and probably...
  9. You know.. you could also put a NC relay for a...

    You know.. you could also put a NC relay for a 2nd clock voltage, and you would have both OFF and ON timers. However after the fire inspector found the root cause of the fire, your sparky friend...
  10. I forgot... I've seen one of these USB stick...

    I forgot... I've seen one of these USB stick loggers. Pretty handy.

    http://www.tiptemp.com/Product.aspx?ProductID=1309

    You can record 16,000 Plus datapoints between 10s and 12 hour interval....
  11. I do it with a Crestron automation controller. It...

    I do it with a Crestron automation controller. It has 8 Digital Analog inputs, or you can use a Crestron thermostat which allows you to log things without engineering your own hardware. If.. you are...
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    You are attempting to enter a deep level of...

    You are attempting to enter a deep level of aerospace engineering that isn't applied in HVAC because there is no measured benefit. Your contractor can't guarantee an exact written CFM for each duct...
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    Did they use any instruments to draw this...

    Did they use any instruments to draw this conclusion?

    Sounds like your AC is not operating at it's designed efficiency as it used to 5+ years ago. As long as you don't ask Al Gore, it's safe to...
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    1,768

    3 tons would mean 1200 CFM through 2 Sq Ft = 600...

    3 tons would mean 1200 CFM through 2 Sq Ft = 600 Sq Ft sucking through the filter = Not 600 CFM = Leaf Blower noise

    If you test it with the filter open, does it still sound like a leaf blower?
    ...
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    26
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    1,768

    How did this guy determine that he should use 3...

    How did this guy determine that he should use 3 tons instead of 2.5? Did he perform a lod calc, or did he upsize because the old unit wasn't adequate (old = not producing 12,000 BTU / ton like it did...
  16. on a 95F day, 9-10 minutes ON, how long is it...

    on a 95F day, 9-10 minutes ON, how long is it OFF? At what temp is the Thermostat set to? On an 80F day, 7-8 minutes ON, how long is it OFF?

    In one full cycle, What is the highest point and lowest...
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    1,495

    Do you mean underground?

    Do you mean underground?
  18. Replies
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    6,115

    Back to the original post: I think I would...

    Back to the original post:


    I think I would go with this option.
  19. Replies
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    1,880

    Mystery Solved

    These are heat expansion loops so that between winter and summer due to the thermal expansion coefficient of copper the pipe doesn't buckle. I believe these are required by code....in an oil pipeline...
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    6,115

    Why would you aircondition your attic if you are...

    Why would you aircondition your attic if you are not living in it? The attic has a great amount of surface area and unnecessary heat gains resulting in additional losses. Is the attic warmer then the...
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    Cut and paste from a previous post... Look at...

    Cut and paste from a previous post...

    Look at these two - You'll need cooling hours from the 1st one (probably ~1986 hours)
    http://www.airconceptsinc.net/operation
    ...
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    4,561

    Those Who Can, Do; Those Who Can't, Teach HVAC....

    Those Who Can, Do; Those Who Can't, Teach HVAC. Those who can't teach HVAC are coaches.
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    1,880

    Anti-SEER Reactor Cell

    Anti-SEER Reactor Cell
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    24
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    1,880

    Bonus loop for copper thieves. Pipe sweating...

    Bonus loop for copper thieves. Pipe sweating exercise at your expense.

    Certainly doesn't add to flow performance.
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    come on guys... he is looking for a practical...

    come on guys... he is looking for a practical temporary solution.

    Build an addition to match the oversized system.
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