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Type: Posts; User: unclebingo

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  1. Replies
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    Verify EFLH formula

    Can anyone verify the formula to calculate the Equivalent Full Load Hours for either heating or cooling as being:

    EFLH = 24 x CDD / Delta of indoor design and outdoor 1% Dry Bulb.

    Thanks
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    No, it's a simple 2 bedroom single story home...

    No, it's a simple 2 bedroom single story home with fireplace used for all locations. It's infiltration rate is average.

    I made sure to use the same envelope each time. The only change was the...
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    ManualJ Puzzle of the day

    Using the supplied ManJEd8 spreadsheet, I have performed a number of test calculations in different locations using a default set of controls, and construction envelope.

    The defaults are:
    Indoor...
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    Area / Perimeter Calc

    Anyone run into this little gem?

    www.sketchandcalc.com
  5. Thread: Math Quiz

    by unclebingo
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    I'm pleased my Garbage In has a Carnak Out filter!

    I'm pleased my Garbage In has a Carnak Out filter!
  6. Thread: Math Quiz

    by unclebingo
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    I'm referencing the ASHRAE 2005 Fundamentals >...

    I'm referencing the ASHRAE 2005 Fundamentals > Climate Data > IP Stations > 725450.PDF

    Row:
    Monthly Design Dry Bulb and Mean Coincident Wet Bulb Temperatures

    Column:
    1% Dry Bulb for each...
  7. Thread: Math Quiz

    by unclebingo
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    I managed to find the ASHRAE 2005 Fundamentals at...

    I managed to find the ASHRAE 2005 Fundamentals at my local library but the climate data doesn't include HDD / CDD. So I was hoping I could calculate it by subtracting the 1% Dry Bulb data for each...
  8. Thread: Math Quiz

    by unclebingo
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    Carnak, you were right re Degree Days. Cedar...

    Carnak, you were right re Degree Days. Cedar Rapids has 6924.

    Month 1% dbF Days HDD
    Jan | 45.7 | 31 | 598.3
    Feb | 54.6 | 28 | 291.2
    Mar | 70.6 | 31 | -173.6
    Apr | 80 | 30 | -450
    May | 85.2...
  9. Thread: Math Quiz

    by unclebingo
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    Thanks for laying it all out Carnak, much...

    Thanks for laying it all out Carnak, much appreciated!

    Pity the correction factor can't be calculated... It sounds like it has something to do with octane and elevation?
  10. Thread: Math Quiz

    by unclebingo
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    Cedar Rapids, Iowa But understanding the...

    Cedar Rapids, Iowa

    But understanding the formula is more important to me than just getting you guys to tell me the answer.... I wanna learn!
  11. Thread: Math Quiz

    by unclebingo
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    So the correction factor is only needed if I...

    So the correction factor is only needed if I adopt a standard 97.5% design temp difference?

    I know that the Manual J spreadsheet I have automatically calc's the HTD for me when I enter the...
  12. Thread: Math Quiz

    by unclebingo
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    If I'm using monthly 1% DB data then outdoor...

    If I'm using monthly 1% DB data then outdoor design temp varies from month to month. Does this suggest I need to calc each month?

    What is the correction factor?
  13. Thread: Math Quiz

    by unclebingo
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    I've yet to collect the HDD figures, and for the...

    I've yet to collect the HDD figures, and for the purpose of building the formula I was using default figures from www.hvacopcost.com for both HDD and BTUH loss.

    When I can gain access to the house...
  14. Thread: Math Quiz

    by unclebingo
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    Math Quiz

    Please check my math...

    If my home losses 80000 BTUh, and I live in a region with 3784 Heating Degree Days, then I use 7,265,280,000 BTU per year.
    (BTUh x 3784 x 24)

    Which is 72652.8 Therms...
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    Would you expect the standby, startup and...

    Would you expect the standby, startup and shutdown losses to = 48% of a AFUE 90 furnace?
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    Understood However, after comparing the...

    Understood

    However, after comparing the results from my calc with those of hvacopcost.com a pattern emerges. As efficiency changes, so does the percentage difference between results.

    Variables...
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    78% thermal efficiency = AFUE of 64%

    How can I resolve the thermal efficiency (defined as percentage of fuel converted to heat) from the AFUE rating?

    I understood the AFUE # was the percentage of fuel converted to heat, but the...
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    mchild Many thanks. I believe I have included...

    mchild
    Many thanks. I believe I have included all factors you mention into my calculations. I would appreciate a fresh per of eye's from someone who has completed the process.

    May I send you a...
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    Cost to Operate

    Any Excel guru's with knowledge of how to calculate the cost to operate out there?

    I'm building an Op cost xls, but my results so far are way off those of http://www.hvacopcost.com/

    I'd be...
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    Manual J on monolithic house

    I'm performing a detailed Manual J (Block load only) on a house in Valencia, Spain.
    This home is of a monolithic construction, i.e. it's floors are concrete slabs (poured into forms) and supported...
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    Thanks Pstu I would describe a partition wall to...

    Thanks Pstu
    I would describe a partition wall to separate a conditioned utility room or den in the basement with a garage that sits within the house envelope. In that case there might also be a...
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    So, to clarify. You used HVACCalc to perform a...

    So, to clarify. You used HVACCalc to perform a block load of the house envelope only, rather than performing a room by room load and have HVACCalc total up for a block load?

    Presumably the room by...
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    Block load calculation question

    I'm using the Manual J "MJ8ae v1.08" spreadsheet to calculate the block load of a house.

    Is it possible to perform a block load without entering all room loads, i.e. just enter data about the...
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    ?

    ?
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    Garbage In Garbage Out, right. I've noticed...

    Garbage In Garbage Out, right.
    I've noticed there are disparities between ACCA and ASHRAE data when calculating design grains difference between inside / outside grains.
    Birmingham AL - ACCA
    45%...
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    Have found a better online calc that does the...

    Have found a better online calc that does the job.
    http://www.envirochex.com/Psychro.htm

    Thank you very much for your ongoing advice Carnak, I'm pleased I got there in the end!
    Much appreciated.
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    Carnak This is nice little utility but it...

    Carnak
    This is nice little utility but it doesn't state the grains figure.
    http://www.sugartech.co.za/psychro/index.php
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    Carnak Do I understand that these RH figures are...

    Carnak
    Do I understand that these RH figures are constant at an indoor 75f? i.e.
    55% RH = 71.5 grains
    50% RH = 64.9 grains
    45% RH = 58.3 grains

    If so, I need only be concerned with the...
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    Carnak, after a 2 days of trying, I'm sorry to...

    Carnak, after a 2 days of trying, I'm sorry to say I'm struggling to follow your instructions.

    Are you able to dumb it down to the point where I can identify specific columns in the ASHRAE table,...
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    Many thanks Carnak. I'll give that a try.

    Many thanks Carnak.
    I'll give that a try.
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    Great description Carnak, and I can see your...

    Great description Carnak, and I can see your point.

    For the purposes of adding "rest of the world" design data to my ACCA table, is it possible to calculate the ACCA Design grains 45%, 50%, 55%...
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    ACCA Design Conditions Data...

    ACCA Design Conditions Data
    http://hvac-talk.com/vbb/picture.php?albumid=62&pictureid=202
    ASHRAE Design Conditions Data
    http://hvac-talk.com/vbb/picture.php?albumid=62&pictureid=182...
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    Thanks again Shophound.. checking into...

    Thanks again Shophound.. checking into Psychrometric calcs now.
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    Here's more info on the ASHRAE data for...

    Here's more info on the ASHRAE data for Birmingham, AL if that helps?

    Dehumidification DP/MDB and HR
    .4% | 1% | 2%
    DP HR MDB DP HR MDB...
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    Thanks Shophound, impressive knowledge of the...

    Thanks Shophound, impressive knowledge of the subject.
    The ASHRAE figures are still a mystery to me tho...
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    Relative Humidity - ASHRAE v ACCA

    I'm adding the ASHRAE Outdoor Design Conditions as a lookup table to my ACCA MJE8 spreadsheet and I notice that ASHRAE don't represent RH in the same way as ACCA.

    The ACCA manual gives you the RH...
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    I guess the cost of WrightSoft or HVAC Calc can...

    I guess the cost of WrightSoft or HVAC Calc can be justified if you perform calcs frequently enough. I notice their are two versions of HVAC Calc, Residential and Commercial both at $389 which puts...
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    So there are approved calc's that authorities...

    So there are approved calc's that authorities recognise for the purpose of rebates?
    Surely if there all based on the MJe8 they would all output the same results?
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    Load Calc of Choice?

    I'm new to the industry and thinking of investing in a load calc. Have been using the ACCA MJ8 spreadsheet to perform load calc's up till now but it's "ballache". I see "HVAC Calc" has a permanent...
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    Many thanks Paul I'll look into those resources....

    Many thanks Paul
    I'll look into those resources.
    Cheers
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    $499 for the ASHRAE handbook, and $499 for...

    $499 for the ASHRAE handbook, and $499 for Wrightsoft Right J! I'm using the ACCA MJ8 Excel sheet to perform calcs, and just wanted to add new locations to the Outside Design Conditions table in...
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    jwiehagen76 Can you confirm Wrightsoft provides...

    jwiehagen76
    Can you confirm Wrightsoft provides design conditions for locations outside of the US?
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    Thanks jwiehagen76 But I'm looking for values...

    Thanks jwiehagen76
    But I'm looking for values for all locations in these countries. In the same way you can find all locations in the US listed in the Manual J Ed8 book. So I'm looking for an...
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    Similar to the ACCA Manual J Ed 8, pages 83 -...

    Similar to the ACCA Manual J Ed 8, pages 83 - 101, I'm looking for all locations in the UK and Australia. I'm assuming similar tables exist for these locations in order to perform loads calcs in...
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    I'm looking for UK and Australia primarily, but...

    I'm looking for UK and Australia primarily, but would be interested in all EU countries if the data exists?
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    Outdoor Design Conditions

    Hi Folks
    Can anyone point me in the direction of Outdoor Design Condition tables similar to that published in the ACCA Manual J Edition8 for countries outside of the US?

    The table has the...
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