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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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    663

    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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    1,535

    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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    1,203

    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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    2,436

    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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    939

    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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    1,634

    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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    961

    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...
  13. Replies
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    1,079

    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...
  14. Replies
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    1,924

    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?
    ...
  15. Replies
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    1,924

    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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    1,632

    Do you mean underground?

    Do you mean underground?
  18. Replies
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    6,850

    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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    2,091

    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...
  20. Replies
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    6,850

    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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    630

    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
    ...
  22. Replies
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    5,382

    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.
  23. Replies
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    2,091

    Anti-SEER Reactor Cell

    Anti-SEER Reactor Cell
  24. Replies
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    2,091

    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.
  25. Replies
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    893

    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.
  26. Replies
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    4,360

    Beenthere - You showoff !!! I'm just over...

    Beenthere - You showoff !!!

    I'm just over double that....for double sq ft+, and I only have a Goodman.
  27. Replies
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    16,706

    Take a look at this: ...

    Take a look at this:

    http://www.nppd.com/My_Home/Services/Additional_Files/airconditioning_calculator.asp

    Per: http://www.hvacopcost.com/

    Use 2803 Cooling hours for Houston.

    For KWH...
  28. Replies
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    509

    I didn't measure temps until today. 10+ systems...

    I didn't measure temps until today. 10+ systems running at about 50% duty cycle at 88F outside. 72F return, 67F coming out and very loud from exit FPM (Annoying loud / 12-15ft throw you can feel with...
  29. Replies
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    509

    5F Split - New Rooftop units

    I'm in a new commercial building with multiple rooftop units, maybe ~ 10 tons each. For all the units the temperature split is only about 5F. Supply 67F, return 72F (overcast 88F outside). The air...
  30. Replies
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    1,490

    A current clamp would tell a lot, but since you...

    A current clamp would tell a lot, but since you didn't already, you don't have one. Your backwards rolling date gives me a migrane...

    Comparing the ratio of daily KWH consumption to daily high...
  31. Replies
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    3,222

    ...cold air. My 5 Ton 16 SEER Goodman has been...

    ...cold air.

    My 5 Ton 16 SEER Goodman has been flawless for 14 months. 3500 sq ft, wife keeps it at 77F, stage 2 required only above 99F outside. 6 people in the house and a pool pump. Electric...
  32. Replies
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    9,513

    How about a hydrogen powered bicycle...propelled...

    How about a hydrogen powered bicycle...propelled by burning hydrogen, which is genrated by elcetricty from pedaling a generator. I'm sure there's a market for it.

    I've figured a method to convert...
  33. Replies
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    Wow there is one. Too funny... Creates 31,000...

    Wow there is one. Too funny...

    Creates 31,000 BTU. Requires 1/2 Gallons water / hour... oh and a 220 VAC 60A circuit.

    Lets say it draws 44A @ 220 VAC = 9680 Watts = 32912 BTU spent making...
  34. Replies
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    9,513

    Hydrogen is a really small atom...the smallest...

    Hydrogen is a really small atom...the smallest one actually. Natural gas is mostly Methane, a molecule with a molecular weight about 16x that of Hydrogen. Guess which will leak easier.

    Hydrogen...
  35. Replies
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    Beenthere - Do you mean per average install...

    Beenthere - Do you mean per average install that's not properly installed?

    Isn't it safe to say the manufacturer's are regulated by some governing entity not to inflate the advertised SEER of a...
  36. Replies
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    Go with a single 15-17 SEER 2-speed unit with...

    Go with a single 15-17 SEER 2-speed unit with zoning. This will hit the best ROI sweet spot. You'll have only 1 unit to purchase, install and service. Be sure your lineset is replaced if there's any...
  37. Replies
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    1,145

    A bible story comes to mind... something about...

    A bible story comes to mind... something about teaching a man to fish...

    What leads you to believe the loads aren't adding up?
  38. Sould have bought a good home owners warranty and...

    Sould have bought a good home owners warranty and it would be all covered.
  39. Replies
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    1152 Sq ft 8400 BTU at -10F outside? That's...

    1152 Sq ft 8400 BTU at -10F outside? That's nuts...

    Assuming the design heat interior temperature is 68F, you need only 107 BTU / h / degree of difference between inside and outside.

    Three...
  40. Replies
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    1,677

    You could: a) Have a manual J load calc done for...

    You could:
    a) Have a manual J load calc done for the home + sunroom and have a new variable speed zoned system installed for the home & sunroom.
    b) Have a manual j load calc done for the sunroom...
  41. Replies
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    Do you know the efficiency of this air cooler?...

    Do you know the efficiency of this air cooler? Are you attempting to calculate the efficiency?

    If it was 100% efficient, your 3000 M^3 of air would enter at 25C and exit at 15C. This would be...
  42. Replies
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    457

    Later this summer when you sell your home, you...

    Later this summer when you sell your home, you will not have any real estate market advatage by spending the extra $$$. If it's installed per code and it works, you'll sell your home for the same...
  43. Replies
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    Here's a thread from few days ago in response to...

    Here's a thread from few days ago in response to High SEER payback.

    http://www.hvac-talk.com/vbb/showthread.php?p=1883255#post1883255

    You are at 1400 hours or less of cooling per year, two 21...
  44. Replies
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    After the required return airflow is satisfied,...

    After the required return airflow is satisfied, excess returns in unconditioned space will add to undesired total heat gain / loss resulting in wasted energy.

    Sometimes extra returns are needed...
  45. Thread: miami!!!

    by gonekuku
    Replies
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    576

    How old is the current system? How much is her...

    How old is the current system? How much is her electric bill now? How long does she plan on owning the townhome?

    The real estate market doesn't care about SEER. They just care that the AC works....
  46. This is what I see stolen per news in Dallas:...

    This is what I see stolen per news in Dallas:
    -Copper from AC's
    -Copper wire from construction sites
    -Copper wire from sports field lighting poles
    -Copper gutters
    -Catalytic converters ...
  47. Replies
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    25,329

    In theory, going from a 14 SEER to 16 SEER, you...

    In theory, going from a 14 SEER to 16 SEER, you will consume about 13% lesss electricity for the same BTU's of cooling.

    Is it worth it? Plug in the numbers...and tell us how many months it will...
  48. Replies
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    I don't know the answer, but I can divide. ...

    I don't know the answer, but I can divide.

    Minutes in a day 1440
    Minutes to fill Quart 2.5
    Quarts / day 576
    Gal / day 144

    Minutes in a day 1440...
  49. Replies
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    This is a great soultion for rednecks that want...

    This is a great soultion for rednecks that want to go green.

    I would spend about $12 a mo to run the fan, and extra $12 a mo to run the pool pump longer to make up for the loss in waterflow...
  50. Replies
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    497

    Not possible. AHS doesn't answer their phone in...

    Not possible. AHS doesn't answer their phone in less than 15 minutes unless you are calling the number to sign up as a new customer.
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