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  1. Replies
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    My Toutside was about 5C so:...

    My Toutside was about 5C so:
    67000*20/(20+120)*37/(19-5) ~ 29k

    This compares closely to my Manual J model which is 35k at Tdesign of -7C. It would appear my furnace is about 2x oversized. Is it...
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    Thanks for the info. I get 9571 BTU/hr using...

    Thanks for the info.

    I get 9571 BTU/hr using 67000 * 20 / (20 + 120)
    Times are in minutes. Seems very low but the formula makes sense.


    Using the 2nd formula I get the same value (9571):...
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    894

    pstu

    PSTU:
    I have a similar program (Hot2xp) that models the entire house, rather than room by room, which is free from the CDN government. I'm somewhat reluctant to provide a link as I assume this site...
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    894

    Can a building's heat loss be calculated based on...

    Can a building's heat loss be calculated based on area and temp drop over a given period of time? In my case, at 3C outside my inside temp drops from 19C to 16c in 6hours or 2C every 2 hours in a...
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    You spent your money on the wrong upgrade. If...

    You spent your money on the wrong upgrade. If your home's energy efficiency is 50 years old, you should have upgraded the insulation, replaced windows (low-e argon), replaced doors and air sealed. I...
  6. Contractor did not want to put in a smaller...

    Contractor did not want to put in a smaller furnace, there are the odd -15 days here and the next owner may want to maintain a higher temp.

    If it only runs twice a day, 4 months a year it will...
  7. After upgrading insulation and windows and...

    After upgrading insulation and windows and replacing a 30 year old 120k NG furnace with a 75k 92% unit, my calculated heat loss went from 110,000 to 32,000 btu/hr. At a setpoint of 19C with outside...
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    Adding more insulation will result in...

    Adding more insulation will result in insignificant savings. Concentrate on windows, air sealing and wall and basement insulation.

    Download hot2xp and model your home's heat load here:...
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    If I set it to 3 does it create 3 20 min...

    If I set it to 3 does it create 3 20 min intervals? If the setpoint is reached in 5 mins does it keep the furnace off for the next 15 and let the temp drop?
  10. On my programmable tstat the default is 5 cycles...

    On my programmable tstat the default is 5 cycles per hour for a regular furnace and 2 for a condensing. Why is there such a difference? The other option is to disable cycling in which case in starts...
  11. Re: Really, Your data is ___ ?

    My model shows 32% "Usable Internal Gains" (see below):



    HOT2XP Version 2.61 File: HOME_R40_LOW Oct 10/06 12:35:21 Page 1


    ...
  12. Replies
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    Contractor simply extended the exhaust 12" to the...

    Contractor simply extended the exhaust 12" to the right. Inspector had no problem with the elbows.
  13. Replies
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    2,277

    make-up

    make-up
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    2,277

    It is code here in BC (vancouver) near seattle....

    It is code here in BC (vancouver) near seattle. My air leakage is 6 ACH at 50kpa
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    Re: fresh air

    Inspector said that w/o it the same old air would continually be recirculated and would make us feel sick as air would become oxygen depleted. It feeds the main air return duct just above the filter...
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    Inspector says the capped air supply on the left...

    Inspector says the capped air supply on the left is too close (36" min) to the exhaust and must be re-opened. The contractor could either move the exhaust over 12" or extend the fresh air intake 12"....
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    3000 sqft 75k btu 91% in Pacific northwest coast....

    3000 sqft 75k btu 91% in Pacific northwest coast. Extrtapolate that to 640sqft = 15k btu!!!
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    For heating such a small space I would use a...

    For heating such a small space I would use a couple of portable or baseboard heaters. We regularily heat our 300 sqft kitchen/family room with one 1500 watt (5200btu) heater with winter temps down to...
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    After reading the "Ignorance" thread (closed), I...

    After reading the "Ignorance" thread (closed), I would like to say a big thank you to all of you for your many helpful responses helping me select a condensing gas furnace and ensure the contractor...
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    It works! I was expecting the fan to come on...

    It works! I was expecting the fan to come on immediately but had to wait a few secs for it to startup after turning on the safety switch. I guess it needs to run thru some self diagnostic on power up.
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    In summer, our basement, where the gas condensing...

    In summer, our basement, where the gas condensing furnace is located, is about 15F cooler than the main floor. There is 1 return duct in the basement and 2 on the main. Would it be possible to cool...
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    Tech 91 G191BU gas condensing just installed this...

    Tech 91 G191BU gas condensing just installed this year. The terminal block on the PCB has 5 terminals marked R C W Y G. This is no fan limit switch
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    Anyone? I tried jumping the R and G but the fan...

    Anyone? I tried jumping the R and G but the fan does not come on. It's hot as hell here.
  24. A gigajoule (GJ) of Natural gas costs approx $10...

    A gigajoule (GJ) of Natural gas costs approx $10 which is about 1 million btu. So a lower COP rated HP would not save significant $? We use approx 60 GJ's per year.
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    I want to run the blower during hot days (furnace...

    I want to run the blower during hot days (furnace is in the cooler bsmt) My thermostat does not have a fan setting just 2 wires connected to R and W terminals. Can I run a jumper between R and G to...
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