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  1. Replies
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    True. It may not be. This is really just an...

    True. It may not be. This is really just an example of that combo assuming a 58CV furnace.

    Anyway, the point was to provide the AHRI site to give the OP the ability to look up the combinations.
    ...
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    You can look up ratings here: ...

    You can look up ratings here:

    http://www.ahridirectory.org/ahridirectory/pages/ac/defaultSearch.aspx

    The last combo you posted in the original post looks like AHRI# 3045311

    SEER = 13.5
    ERR=...
  3. Replies
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    6,085

    The nitrogen will dry the system, but not because...

    The nitrogen will dry the system, but not because it abosrbs the moisture or reacts with it.

    Say you had a 1 cu.ft container filled with air at 0% RH. Then say you evaporate 1 oz of water into it....
  4. Thread: Heat

    by KCA
    Replies
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    446

    classical physics: energy cannot be created nor...

    classical physics: energy cannot be created nor destoryed. You just change the form. This might be burning fuel (chemical energy) use to heat water, steam expands against turbine blades (mechanical...
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    On the calculator, I did verify that it shows...

    On the calculator, I did verify that it shows exactly what I got, so it simply uses the ideal gas law (compressibility not accounted for). This is fine as the compressibility factor wouldn't change...
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    Sorry about that. :) In the real world,...

    Sorry about that. :)

    In the real world, nothing is perfect. However, nitrogen behaves pretty close to ideal. I'll have to look up what the compessibility factor is at these higher pressures...
  7. Replies
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    No gases are truly ideal, but nitrogen is close...

    No gases are truly ideal, but nitrogen is close to ideal at atmospheric pressure and near room temperature.

    Ideal gas law is: PV=nRT

    For real gases, it is: PV=ZnRT, where Z is the...
  8. Replies
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    Here's what that gauge can do: Digital...

    Here's what that gauge can do:

    Digital pressure gage, range 30" Hg to 0 psi, selectable engineering units: -14.70 psig, -1.033 kg/cm², -1.013 bar, -29.93" Hg, -33.94 ft w.c., -101.4 kPa, -235.2...
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    2,160

    Using bar isn't going to be accurate enough for...

    Using bar isn't going to be accurate enough for the job. See if you have Pa, mTorr, microns, etc.

    1 bar is 14.5 psia

    Assuming the bar setup is measuring psig (reads 0 when no vacuum present),...
  10. Replies
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    2,796

    I bet there was no load calc done. I'm just north...

    I bet there was no load calc done. I'm just north of you (central VA) and my calculated cooling load is 2.5 ton. This is a 43 year old house, single pane glass, 3300 sqft (2/3 of that being above the...
  11. Replies
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    4,671

    Yep. Back in the 70's (with the energy crisis),...

    Yep. Back in the 70's (with the energy crisis), France said they didn't want to rely on oil/nat. gas for electricity. Parts of France are even higher than 78% nuke. In the southern part of France, it...
  12. Replies
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    4,671

    Currently, due to the economy, electrical demand...

    Currently, due to the economy, electrical demand is down a bit. However, nuke is still moving forward.

    Two new units (AP1000) are being built at the Vogtle site:
    ...
  13. Replies
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    4,671

    There are improvements on the fission nuclear...

    There are improvements on the fission nuclear power design. In terms of a new energy source, fusion is probably the only "new" source out there that could really be used to generate power in larger...
  14. Replies
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    Nope. You are thinking of the Large Hadron...

    Nope. You are thinking of the Large Hadron Collider (LHC). This is a very large accelerator that slams particles into each other at high energy and creates new particles in the process.

    ITER is a...
  15. Replies
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    4,671

    If you guys are interested in real fusion, you...

    If you guys are interested in real fusion, you should check this out:

    www.iter.org

    This is the largest fusion reactor ever built. We have to wait a bit to see it work. First plasma not expected...
  16. Replies
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    Correct. As I said, the results could not be...

    Correct. As I said, the results could not be reproduced. Whether it actually happened doesn't really matter if the results could not be reproduced. It could have been a matter of that they believed...
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    Here's some additional info too: ...

    Here's some additional info too:

    http://en.wikipedia.org/wiki/Cold_fusion
  18. Replies
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    4,671

    Although many things are possible (even if we...

    Although many things are possible (even if we don't know/understand now), for me (and others) to believe it, the experiment has to be repeatable. It would be like you working on a condensing unit,...
  19. Replies
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    4,671

    The explosions were due to hydrogen building up...

    The explosions were due to hydrogen building up in the outer building. This building is basically just a roof/enclosure for the plant and is not meant to contain releases. The fact that it blew up...
  20. Replies
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    Right. Cooling water is #1. With the plants in...

    Right. Cooling water is #1. With the plants in Japan, the problem wasn't really due to a lack of pumps, but a lack of power instead. Normally, there are two independent connections to the electrical...
  21. Replies
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    4,671

    With Japan, what I find impressive is how well...

    With Japan, what I find impressive is how well everything stood up to the disaster. It is really pretty impressive when you thing about it. A 9.0 quake plus a giant wave of water...some serious...
  22. Replies
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    The initial testing rig was non-nuclear. Scaled...

    The initial testing rig was non-nuclear. Scaled down and used electric heaters (~700kW) to test operation.

    OSU does have a nuclear research reactor (TRIGA, mkII). This is a 1.1 MW steady-state...
  23. Replies
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    4,671

    I had something written up, but I lost the...

    I had something written up, but I lost the post...:(

    Let's try again:

    Calvert Cliffs: Not exactly. I haven't been to the site, but have worked a bunch on a new design that they would like to...
  24. Replies
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    Okay. Thorium fuel cycle. I figured that you...

    Okay. Thorium fuel cycle. I figured that you might have been talking about fusion. Anyway, thorium has some advantages. However, everything is setup for a uranium cycle and there isn't really a...
  25. Replies
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    Not yet. I'll take a look at them later. Got to...

    Not yet. I'll take a look at them later. Got to run now.
  26. Replies
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    Either. Fusion, fission, other issues... ...

    Either. Fusion, fission, other issues...

    There's a lot of bad info out there on nuclear energy. I'd be happy to try to clear up any questions that you may have.
  27. Replies
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    I'm a nuke engineer. Let me know if you have any...

    I'm a nuke engineer. Let me know if you have any questions.
  28. Replies
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    3,752

    You can call it either. A true 1-pole would only...

    You can call it either. A true 1-pole would only have two terminals (1 in, 1 out). Look at a light switch. A typical light switch is single pole, single throw.

    What is listed as a 1.5 pole...
  29. Replies
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    http://hvac-talk.com/vbb/showthread.php?t=610232

    http://hvac-talk.com/vbb/showthread.php?t=610232
  30. Replies
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    I bet that the 3 ton is even too big for your...

    I bet that the 3 ton is even too big for your place in Mass. My house is similar in size (~2300 sqft above grade) plus ~1100 sqft in walkout basement. My house is older (43 years), single pane glass,...
  31. Replies
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    Power usage in kwh would be more helpful than $$$...

    Power usage in kwh would be more helpful than $$$ as we don't know your local rates. Even better would be power history for say the last 12 months in order to separate out how much of the bil is...
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    1. Where are you located? 2. Did any of them...

    1. Where are you located?

    2. Did any of them do a load calculation (Manual J)? You need to know the load in order to size it right. Once the unit is sized, the ductwork will have to be checked to...
  33. The nice thing about air sealing and adding...

    The nice thing about air sealing and adding insulation is that not only can it save money by allowing a smaller unit, but it also saves on heating/cooling costs 24/7 for the life of the house. Not...
  34. It's it best to use what is in the code or at...

    It's it best to use what is in the code or at most bump it up by 5F. Although the temperature may exceed this value for a couple hours out of the summer, it is no big deal. All it means is that your...
  35. Remember that he cranked up the summer design...

    Remember that he cranked up the summer design temperature. I haven't checked, but I suspect that the actual summer design temperature is more like 95F (or less) for NJ. Depending on how much...
  36. Replies
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    Perhaps an easier way to think of the PT charts...

    Perhaps an easier way to think of the PT charts is imagine if we were talking about steam/water. Same sort of thing. The only difference is that it is at a different pressure/temperature.

    With...
  37. Replies
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    Exactly. Several assumptions have to be made. For...

    Exactly. Several assumptions have to be made. For instance, you have to assume that her tag was somehow unique or in a location where no one else was tagging. No births/deaths or birth rate = death...
  38. Replies
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    I know it is not your problem. I'm just saying...

    I know it is not your problem. I'm just saying that the actual number would depend on many things. For instance, if she went back and went to the same nests each time, she would just keep counting...
  39. Replies
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    It depends on many things as well as how randomly...

    It depends on many things as well as how randomly the sampling is...but based on what you show and what I think you believe the answer is: 104

    9/36 = 25% tagged

    26 initially tagged and...
  40. Replies
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    1,609

    You don't know the total number of hawks. You can...

    You don't know the total number of hawks. You can only determine that some hawks live there. The count is based on the number that she caught and not to total number that are actually there.

    The...
  41. Replies
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    1,637

    As mentioned, the liquid line should be 3/8"...

    As mentioned, the liquid line should be 3/8" (normally). Let's hope that you don't have a 3/8" suction line. If that is the case, the guy is correct and it should be larger. It depends on the system,...
  42. Replies
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    2,687

    Not to mention that the current system is...

    Not to mention that the current system is probably R-22 and the new one would be R-410a.
  43. Replies
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    You need the CV spec of the valve. You can use...

    You need the CV spec of the valve. You can use that to determine pressure drop. There will always be some pressure drop even if the valve is open. The amount of pressure drop depends on the fluid...
  44. Replies
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    2,706

    Dry means that they are shipped without any R22...

    Dry means that they are shipped without any R22 in them, but they are still R22 units. You'll just need to fully charge the thing when it gets installed instead of having it come pre-charged for 15'...
  45. Replies
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    The values you listed are total. For instance, my...

    The values you listed are total. For instance, my 3 ton York with 15kW of heat has 80A min circuit ampacity and max OCP of 90A. A similar 2 ton York with 10 kW of heat needs 53A min circuit ampacity...
  46. Replies
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    The ceiling of the basement has some sound...

    The ceiling of the basement has some sound insulation, but that doesn't matter. Go back and look at the calc. For a ceiling, you select what is above the space. Your choices are:

    - ventilated...
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    If the basement is finished, then there should be...

    If the basement is finished, then there should be no heat loss/gain from the 1st floor in the calculation. Both would be expected to be at the same temperature, so there would be no flow of heat...
  48. Thread: Heat Strip Staging

    by KCA
    Replies
    31
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    4,881

    Exactly. You can't get around the physics of it....

    Exactly. You can't get around the physics of it. If your 10 kW strip is only pulling 20A, it is only giving you 5kW of heat unless it is being run at 480v.

    The strips are normally 5kW each and...
  49. Thread: SEER: 17 vs 20

    by KCA
    Replies
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    2,812

    Can you provide more details on the house...

    Can you provide more details on the house (location, size, cooling/heating load (manual J, if known), how many kwh you get for that $600 bill, etc.)? What is the SEER of the current AC unit(s)?
    ...
  50. Replies
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    My comparison is assuming that this warranty had...

    My comparison is assuming that this warranty had been available when the SEER values were lower. My point is you can look to the past and see how things have changed to get an idea of future changes....
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