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Type: Posts; User: amd

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  1. Thread: Rooftop unit coils

    by amd
    Replies
    5
    Views
    364

    Thanks

    Thanks
  2. Thread: Rooftop unit coils

    by amd
    Replies
    5
    Views
    364

    Is it possible to adapt a commercial opening...

    Is it possible to adapt a commercial opening (existing is a 20+ year old york sunline) to a residential cabinet?

    Can you get an economizer and stainless steel heat exchanger in a residential...
  3. Thread: Rooftop unit coils

    by amd
    Replies
    5
    Views
    364

    Rooftop unit coils

    Does anyone still make a 3-5 ton rooftop without micro channel coils?

    Everything I've seen listed is microchannel.
  4. The purpose of ventilation is to purge the...

    The purpose of ventilation is to purge the moisture and heat from the attic that leaks in from the house. (excess moisture condenses on cold surfaces and heat melts the snow and causes ice dams)
    ...
  5. Replies
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    432

    I'll believe it when I see it.

    I'll believe it when I see it.
  6. Personally I would let it run and let the aux...

    Personally I would let it run and let the aux heat cycle automatically. Resistance heat will always cost you more than the heatpump.

    You can get a t-stat that brings on the resistance heat as soon...
  7. Thread: SAW DUST!!!

    by amd
    Replies
    5
    Views
    484

    He should get a good dust collection system if...

    He should get a good dust collection system if there isn't one and look into a standalone air cleaner to get the dust down to begin with.

    Washables generally aren't good enough to take out fine...
  8. Replies
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    6,564

    Well, it drains, doesn't it?

    Well, it drains, doesn't it?
  9. Replies
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    4,507

    ^Without the subsidies they wouldn't be doing it.

    ^Without the subsidies they wouldn't be doing it.
  10. Hint 1: If you're using an exhaust fan for...

    Hint 1:

    If you're using an exhaust fan for cooling, humidity isn't a factor, so disregard the latent part of the manual j.

    Hint 2:

    What are your design temperatures?

    The lower the delta-t...
  11. Replies
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    4,507

    If alternative energy was viable, you would think...

    If alternative energy was viable, you would think that fossil fuel suppliers would get into the business. They could buy up, put install solar arrays, and sell the energy at a huge profit.
  12. Replies
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    4,507

    Solar is a pain in the neck for utilities because...

    Solar is a pain in the neck for utilities because there's no way to control the output - you can't depend on the power when you need it, but you've gotta buy it when it's produced under contract.
    ...
  13. Replies
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    214

    Basic things to know about two stage furnaces: ...

    Basic things to know about two stage furnaces:

    1. They have the ability to run at 60-70% capacity. The gas valve in two stage furnaces supplies gas to the burners at a lower pressure on low.

    2....
  14. Replies
    20
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    1,343

    ^I'm no fan of ul actually -> selling an alarm...

    ^I'm no fan of ul actually -> selling an alarm which only goes off at 70ppm is crazy, but at least the better models display lower levels, right?

    I know that they've done similar things with smoke...
  15. Replies
    20
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    1,343

    The cheapest kidde alarm on the market has an...

    The cheapest kidde alarm on the market has an electrochemical sensor: http://www.kiddecanada.com/utcfs/Templates/Pages/Template-53/0,8062,pageId%3D2725%26siteId%3D463,00.html

    Care to explain?
  16. Replies
    36
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    9,049

    ^I don't think pressure has anything to do with...

    ^I don't think pressure has anything to do with it though - condensers run at much greater pressure than evaps do, yet leaks are rare, right?
  17. Replies
    5
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    532

    Man, why does vb4 suck so much? The search in vb3...

    Man, why does vb4 suck so much? The search in vb3 worked great.
  18. Replies
    5
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    532

    Google only finds things on the open forums...

    Google only finds things on the open forums anyhow. My things have been moved around.
  19. Replies
    5
    Views
    532

    Searching this board using google.

    Hi,

    I've found that ever since the software upgrade, the internal search doesn't always pick up all the threads it should and list them in the right order.

    Somethings I use google instead - ie...
  20. You can calculate heating BTUs more easily on the...

    You can calculate heating BTUs more easily on the water side; mass flow rate and temp differential required.

    I think accurately measuring cfm is tricky.
  21. Thread: Insulating 90's

    by amd
    Replies
    12
    Views
    992

    Keep the ductwork out of the damn attic - then...

    Keep the ductwork out of the damn attic - then you won't have to insulate 90s. :p

    Such installs should be illegal.
  22. Replies
    12
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    1,503

    Try Hot2000 - simulates energy performance but...

    Try Hot2000 - simulates energy performance but also calculates load.

    Not a professional opinion:

    I can see a new, tight 2400 sq ft house built with r-20 walls only needing 42 000 btu/hr of...
  23. There's a video online of a guy testing sealants...

    There's a video online of a guy testing sealants in a sealed jar with water and refrigerant - the sealant never solidified; was just white goo.

    I would post it but youtube is frowned upon on this...
  24. Replies
    14
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    3,725

    Why not just insulate the damn duct? I would have...

    Why not just insulate the damn duct? I would have been less work.
  25. If they go through with this, a lot of...

    If they go through with this, a lot of contractors in the south are going to start illegally importing cheaper 13 seer units from the north, and vice versa with furnaces.

    I read that they dropped...
  26. Replies
    12
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    880

    nah - let 'em freeze; the players and spectators....

    nah - let 'em freeze; the players and spectators. Outdoor heat is stupid. :p

    Want to be warm? Go to an indoor event for god's sake. :rolleyes:
  27. Replies
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    880

    Sorry to burst your bubble, but if it's outside -...

    Sorry to burst your bubble, but if it's outside - what a waste! Seems as if people are very adept at finding new ways to waste energy when we need to do the opposite.
  28. How much do you get payed per kwh? Is it the...

    How much do you get payed per kwh? Is it the market rate or are there subsidies down there? (meaning it's done at the expense of others ;) )

    Financially there might be a good reason to go solar in...
  29. "Green Illusions is an environmental book that...

    "Green Illusions is an environmental book that pioneers a critique of clean energy, arguing that concerned citizens should instead focus on walkable communities, improved consumption, governance, and...
  30. Green illusions - if you're for solar energy, watch this...

    http://www.youtube.com/watch?v=--OqCMP5nPI

    <iframe width="560" height="315" src="http://www.youtube.com/embed/--OqCMP5nPI" frameborder="0" allowfullscreen></iframe>
  31. Replies
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    1,811

    There's one called r22(insert proper letter here...

    There's one called r22(insert proper letter here ---> x<---) which is sold in Canada. I think it's basically propane. :eek:
  32. ^best advice in this thread :)

    ^best advice in this thread :)
  33. (community) College is good if you find a good...

    (community) College is good if you find a good program and want to learn practical skills. I was just saying that many college programs attract not so good students.

    In Ontario, I think you can do...
  34. I have been through a technical program like that...

    I have been through a technical program like that (not a hvac technician program, and not at george brown)...

    Don't even think about doing the technician program - go for technology. The Ontario...
  35. Stupid question about leak sealents and sealed systems

    There's been a lot of talk about the negative impact sealants can have on equipment if the refrigerant is contaminated with moisture.

    Presumably small factory charged/sealed systems such as window...
  36. Replies
    10
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    805

    <iframe width="420" height="315" src="http://www.youtube.com/embed/c7pNAhENBV4" frameborder="0" allowfullscreen></iframe>

    http://www.youtube.com/watch?feature=player_embedded&v=c7pNAhENBV4#!
  37. Replies
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    1,784

    ...sounds like those steam units are just like...

    ...sounds like those steam units are just like electronic air cleaners - good on paper, completely useless in the field.

    ...not to mention, using electricity to boil water whenever there's a call...
  38. Replies
    4
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    991

    Duct cleaning media sting

    http://www.cbc.ca/marketplace/episodes/2013/01/when-the-repairman-knocks-3.html
  39. Energy illiteracy is the greatest impediment to...

    Energy illiteracy is the greatest impediment to properly sizing furnaces.

    Most salesmen and installers probably don't even know how to convert between kw, BTUs, and tons.

    They probably don't...
  40. Thread: 2 stage furnace.

    by amd
    Replies
    28
    Views
    2,640

    How do you know that the customer wouldn't know...

    How do you know that the customer wouldn't know the difference?

    Shouldn't customers like that not purchase 2-stage furnaces to begin with?

    Why not just offer it as an optional upgrade?
  41. Thread: Darn trojan

    by amd
    Replies
    20
    Views
    1,700

    svchost isn't the bad process itself - it's just...

    svchost isn't the bad process itself - it's just an executable file which hosts some processes.

    You have to find and delete the infected files, then remove the registry keys associated with it.
    ...
  42. Replies
    6
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    933

    Think before you smash

    Couple driven mad by incessant beeping for a YEAR tear down walls of their home to discover it was a smoke alarm in chest of drawers

    ...
  43. Replies
    142
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    23,265

    It makes sense for governments to subsidize r&d,...

    It makes sense for governments to subsidize r&d, but not the deployment of immature technologies.
  44. Replies
    142
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    23,265

    Define "investment grade" Seems to me as if...

    Define "investment grade"

    Seems to me as if ALL "soft asset" financial investments don't have a guaranteed rate of return, and many of them are most likely scams. Why should energy related hard...
  45. Replies
    142
    Views
    23,265

    ^The only problem is that if even 10% of the...

    ^The only problem is that if even 10% of the property owners in your area sign on, the subsidies will get cancelled to control costs.
  46. Replies
    142
    Views
    23,265

    Excuse my use of metric units - I have no idea...

    Excuse my use of metric units - I have no idea how much energy a cubic foot of gas has.

    In ontario, canada has a newer (late 90s, early 90s) relatively well build 2000 sq house with a natural...
  47. Replies
    142
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    23,265

    The annual energy output is so low that the money...

    The annual energy output is so low that the money wasted on solar panels could be better spent on efficiency upgrades.

    Getting rid of a natural draft furnace and air sealing/insulating could save...
  48. Replies
    142
    Views
    23,265

    Paid garbage disposal above a certain limit is...

    Paid garbage disposal above a certain limit is the answer.

    Most larger southern ontario municipalities now have a compost pickup program, along with a limit to the number of bags you can throw...
  49. Replies
    142
    Views
    23,265

    Destroying organic materials wastes the nutrients...

    Destroying organic materials wastes the nutrients which should be returned to farmer's fields.

    Composting is the answer to organic waste problems - no fancy, expensive, nutrient destroying plasma...
  50. Replies
    142
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    23,265

    Isn't the oil/coal/uranium market global? What...

    Isn't the oil/coal/uranium market global?

    What china does surely has an impact on energy availability/cost.

    Most residual waste after recycling/composting consists of:

    - Plastic food...
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