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Type: Posts; User: engineerguy

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  1. Replies
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    Yes, the absence of frost is an indicator of heat...

    Yes, the absence of frost is an indicator of heat loss. That heat loss can come from less insulation or from warm air leaking up through the ceiling.
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    1,148

    McMaster-Carr has a selection of silver solders. ...

    McMaster-Carr has a selection of silver solders.
    www.mcmaster.com
  3. A realtor told me that AC adds $1500 to the value...

    A realtor told me that AC adds $1500 to the value of a house in Ashland, WI. We expect about two weeks per year where the daily high is over 90 degrees.
  4. What everybody else said. The calculations for...

    What everybody else said.

    The calculations for my 1320 square foot house predicted 8500 BTUH (0.7 ton) heat gain at 95 deg F outside, so I had a one ton AC installed. The AC only ran 58% of the...
  5. CottyGee, The uninsulated garage doors THAT I...

    CottyGee,

    The uninsulated garage doors THAT I HAVE SEEN have all had sloppy loose joints barely sufficient to slow down the wind, along with construction that conducted heat around the edges of...
  6. Might be easier, and lower cost, to replace with...

    Might be easier, and lower cost, to replace with a new double wall steel insulated overhead door. These doors are steel on both inside and out with foam on the inside. You can glue on a 1" layer of...
  7. Replies
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    1,990

    Pstu, I measure over several complete on/off...

    Pstu,
    I measure over several complete on/off cycles. The system cycles only about once per hour because the house is so well insulated.

    I lived in Madison for four years when I was a student. ...
  8. Replies
    27
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    1,990

    Pstu: I use a Hobo U12 data logger:...

    Pstu:

    I use a Hobo U12 data logger: http://www.onsetcomp.com/solutions/products/loggers/_loggerviewer.php5

    It's one of the few computer products that actually works the way they advertise. I...
  9. Replies
    27
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    1,990

    My own house is 1320 square feet, lots of...

    My own house is 1320 square feet, lots of insulation, very tight air sealing, good windows, and zero shade. It has a one ton central ducted air conditioning system. Last summer, when it hit 102 deg...
  10. Replies
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    951

    Option 7: Spend an amount in the low to mid...

    Option 7: Spend an amount in the low to mid $X,XXX to upgrade the house insulation and air sealing. Then get a new estimate, which will be for 2 ton or even smaller. The duct size will be large...
  11. Replies
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    Mechanical Engineer with a Professional Engineer...

    Mechanical Engineer with a Professional Engineer license in the state of Illinois. Try here for a start:...
  12. Replies
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    11,721

    If EverettsHVAC gas test finds gas, then it's...

    If EverettsHVAC gas test finds gas, then it's easy. Your furnace ran out of electricity. You need to give it some electricity. It's so simple even I can do it. I give you step by step...
  13. Replies
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    Are they checking incoming power AT THE UNIT? ...

    Are they checking incoming power AT THE UNIT? Checking at the circuit breaker is not good enough.
  14. Replies
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    4,397

    Ah, memories. My grandmother had exactly the...

    Ah, memories. My grandmother had exactly the same setup in her basement. I rewired her basement after she mentioned seeing smoke coming out of the octopus whenever the wash machine was working hard.
  15. Replies
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    1,863

    I have a setup just like Pyropaul. HRV exhausts...

    I have a setup just like Pyropaul. HRV exhausts from the bathrooms, HRV supply to the return side of the airhandler. We have pushbuttons to put the HRV on high for 20 minutes. Those pushbuttons...
  16. Replies
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    1,598

    Not all engineers know what they are talking...

    Not all engineers know what they are talking about, although it would not be productive to say so to that particular idiot engineer. He sounds like the type that you need a baseball bat to...
  17. Replies
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    1,558

    The condensation needs to be solved before you...

    The condensation needs to be solved before you drywall. Make sure the vapor barrier is sealed correctly. Put a humidity meter in the basement and keep the humidity below 50%. You will probably...
  18. A bus is just a longer car? :) I want to do...

    A bus is just a longer car? :)

    I want to do better than 2,200 SF/ton the next time.
  19. That rule of dumb could be fun. I want to test...

    That rule of dumb could be fun. I want to test drive a bus with 50 seats X 36 hp per seat = 1800 hp.

    My house has one ton of cooling, 1320 square feet, and no shade. The AC ran 60% at 101 deg F...
  20. And if your house is insulated like my house, ONE...

    And if your house is insulated like my house, ONE ton will be too much. The load calculation will tell you.
  21. You clearly want to understand what is happening,...

    You clearly want to understand what is happening, so here is something to try.

    If the furnace is burning the correct amount of gas, AND the burner is correctly set up, then you are getting about...
  22. Thread: micro CHP

    by engineerguy
    Replies
    2
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    550

    The idea has been around at least since the 1974...

    The idea has been around at least since the 1974 energy shortage. The difficulty has always been how to build an engine that will last 20,000 to 40,000 hours, automatically synchronize to line...
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    1) When the pressure of a saturated (or slightly...

    1) When the pressure of a saturated (or slightly subcooled) liquid suddenly decreases, some (not all) of the liquid flashes into vapor. You should be able to calculate how much flashes from a...
  24. http://www.buildingscience.com has the best...

    http://www.buildingscience.com has the best information on vapor barriers.
  25. Four gallons a day to keep the humidity at 25% on...

    Four gallons a day to keep the humidity at 25% on a cold day means that you have serious air leakage. It's better to seal air leaks than trying to humidify the entire outdoors.
  26. A poorly insulated house with an oversized air...

    A poorly insulated house with an oversized air conditioner could have a large setback. A well insulated house with a properly sized air condtioner will need a small setback.

    You have to decide...
  27. I have 22 inches in my attic. If I have another...

    I have 22 inches in my attic. If I have another house built, it will have even more insulation. One of the people that built my house has even more insulation in his attic. Seven or eight inches...
  28. Replies
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    4,380

    Four people, no dogs, sensitive noses.

    Four people, no dogs, sensitive noses.
  29. Replies
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    4,380

    We put an HRV into our house. If we turn it off,...

    We put an HRV into our house. If we turn it off, the air gets stale within a day. We do not like to open windows for ventilation because of drafts during cold weather (Northern Wisconsin). We run...
  30. Replies
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    4,380

    The house is in direct sun all day. We planted...

    The house is in direct sun all day. We planted some trees, but it will be several years before we get any shade from them. During that hot spell, it was pure direct sun with no clouds.

    Walls are...
  31. Replies
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    4,380

    My house is 1320 square feet and has a one ton...

    My house is 1320 square feet and has a one ton system set for 370 CFM. Five registers, one in each bedroom and two in the kitchen/living room. An HRV is essential. Ours takes its air from the...
  32. Replies
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    867

    Add a LOT of insulation to the attic. But first...

    Add a LOT of insulation to the attic. But first seal all air leaks up into the attic.
  33. Replies
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    2,655

    What Steve Wiggins and Panama said. My own...

    What Steve Wiggins and Panama said.

    My own house stayed at 78 degrees inside when it was 101 degrees outside. The one ton AC was cycling on and off the whole time. The secret is R60 insulation...
  34. Replies
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    906

    I have such a system in Northern Wisconsin. It...

    I have such a system in Northern Wisconsin. It keeps the house at 70 deg F inside and -30 deg F outside with water temperature at 120 deg F. The house heat demand is about 18,000 BTUH. It has been...
  35. Replies
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    686

    Somewhere on the meter face, it says something...

    Somewhere on the meter face, it says something like Kh 7.2. Kh is the watt-hours per revolution. A typical number on a residential meter is 7.2 watt-hours per revolution.

    Twelve revolutions in...
  36. Replies
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    Vacuum gyros?

    Vacuum gyros?
  37. Replies
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    UMMMM, if the customer wants 50-55 degrees in one...

    UMMMM, if the customer wants 50-55 degrees in one room and a wine room is 50-55 degrees, then build him a WINE ROOM cooling system just for that room. Keep the rest of the house on the existing...
  38. It should do something. A quick look through my...

    It should do something. A quick look through my 1985 ASHRAE Handbook of Fundamentals seems to indicate (note the weasel words) that you could get several thousand BTUH from such a system. If we...
  39. Replies
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    What teddy bear said. Also do a load...

    What teddy bear said.

    Also do a load calculation FIRST. You might be surprised at how small a system you really need.
  40. You might make a guesstimate of the extra cost of...

    You might make a guesstimate of the extra cost of a geothermal system, then ask the builder to put that money into insulation and air sealing upgrades. The heating and air conditioning systems would...
  41. Replies
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    2,274

    Those kind of people only respect those who...

    Those kind of people only respect those who charge them ENOUGH. Charge at least triple normal rate for the service call, then make the access right as part of the job. "Yes sir, you have a top...
  42. Replies
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    Look into a direct vent wall furnace with a...

    Look into a direct vent wall furnace with a millivolt thermostat. It's a low cost setup that will heat the house just as unevenly as the woodburner that you are familiar with.

    Stay away from...
  43. Replies
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    864

    With the same fan at the same RPM, the power at...

    With the same fan at the same RPM, the power at the motor shaft would be the same. The larger motor will run at lower percentage of rated power, so will run at slightly higher speed. The larger...
  44. Replies
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    1,262

    Another option is to add insulation. Your...

    Another option is to add insulation. Your heating system does not heat the basement, it heats the dirt outside. More insulation = less heating the dirt = warmer basement AND a lower heating bill.
  45. Replies
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    $1.36 is about the current WHOLESALE price. ...

    $1.36 is about the current WHOLESALE price.
    Check it out: http://www.wtrg.com/daily/oilandgasspot.html
    They show in $/MMBTU (ten therms).
  46. Replies
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    Overlapped posts here. Thermostat is more likely...

    Overlapped posts here. Thermostat is more likely - look for something called an anticipator.
  47. Replies
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    2,296

    Is a register blowing hot air toward the...

    Is a register blowing hot air toward the thermostat?
  48. Replies
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    1,326

    First, confirm that it's the pump by turning...

    First, confirm that it's the pump by turning power to the pump off, then on when it's making noise. Once you are sure it's the pump, you have some options:

    1) Something, somewhere in the house...
  49. Your controls must deal with the fact that...

    Your controls must deal with the fact that woodburners do not throttle well. Many woodburners control heat by throttling combustion air. Throttling combustion air, especially with unburned wood in...
  50. Replies
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    Get a woodburner with provision for combustion...

    Get a woodburner with provision for combustion air ducted directly from outside. Then it has sealed combustion when the stove door is closed and the dryer cannot suck smoke into the house (except...
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