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Posted by v8z on July 14, 2006, 6:04 pm
I have a few questions for those in the trade:
1: Does the current Manual J 8th edition include considerations,
calculations, and/or values for the infiltration tightness of an ICF
building envelope? Does it utilize both u-factor and shgc for windows?
If so, can it be adjusted to address passive solar gain for structures
designed with proper southern orientation and overhangs?
The windows and doors for the home have Energy star rated u-factor and shgc,
but the shgc is being spec'd high for thermal gain in the winter, with the
windows shaded by building overhangs in the summer ( northern climate zone).
I only received one of several bids requested so far, and the contractor
said he did the load calculations per manual J. But he sort of tap-danced
around specific questions about the calculations, and the unit size/btu
rating seems to me to fit a "sq.ftg./8" sizing, as opposed to an accurate
calculation based on r-22 ICF walls and r-40 ceilings combined with
geothermal and radiant/gyp. floors.
2. I've identified the WaterFurnace brand gshp's as the most efficient, and
have requested the bids accordingly. This contractor spec'd a Synergy3
unit with radiant /forced air htg/ac with a 15kw boiler. When I asked him
about why the Synergy instead of a reversible EW unit, he said forced that
water coil ac air-handlers were hard to find and the boiler was for backup.
I'm not sure how the boiler is backup, since its an all electric
home.........
I'm hoping that the other contractors bidding will be more specific/
forthcoming with information on how they arrived at their specs, but in the
meantime,
Can those with experience of combining geothermal / radiant / ac / ERV
comment on their approach and equipment choices?
Thanks in advance.
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Posted by Al Moran on July 14, 2006, 7:14 pm
show/hide quoted text
>Can those with experience of combining geothermal / radiant / ac / ERV
>comment on their approach and equipment choices?
>Thanks in advance.
Yep, I have a comment...Do your own fucking homework.
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Posted by Bubba on July 14, 2006, 7:41 pm
show/hide quoted text
>I have a few questions for those in the trade:
>1: Does the current Manual J 8th edition include considerations,
>calculations, and/or values for the infiltration tightness of an ICF
>building envelope? Does it utilize both u-factor and shgc for windows?
>If so, can it be adjusted to address passive solar gain for structures
>designed with proper southern orientation and overhangs?
>The windows and doors for the home have Energy star rated u-factor and shgc,
>but the shgc is being spec'd high for thermal gain in the winter, with the
>windows shaded by building overhangs in the summer ( northern climate zone).
>I only received one of several bids requested so far, and the contractor
>said he did the load calculations per manual J. But he sort of tap-danced
>around specific questions about the calculations, and the unit size/btu
>rating seems to me to fit a "sq.ftg./8" sizing, as opposed to an accurate
>calculation based on r-22 ICF walls and r-40 ceilings combined with
>geothermal and radiant/gyp. floors.
>2. I've identified the WaterFurnace brand gshp's as the most efficient, and
>have requested the bids accordingly. This contractor spec'd a Synergy3
>unit with radiant /forced air htg/ac with a 15kw boiler. When I asked him
>about why the Synergy instead of a reversible EW unit, he said forced that
>water coil ac air-handlers were hard to find and the boiler was for backup.
>I'm not sure how the boiler is backup, since its an all electric
>home.........
>I'm hoping that the other contractors bidding will be more specific/
>forthcoming with information on how they arrived at their specs, but in the
>meantime,
>Can those with experience of combining geothermal / radiant / ac / ERV
>comment on their approach and equipment choices?
>Thanks in advance.
You are just too damn funny, buddy. You want all the calc's and all
the answers.....................For Free! Then you can get you and
your buddy to do it on the side over a case or two of beer.
Hit the road.
Bubba
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Posted by v8z on July 14, 2006, 9:07 pm
Actually, I'm a homeowner who's trying to find a contractor that knows his
ass form a hole in the ground.
I'm not asking for the calcs themselves, just trying to find out if the
manual J method has enough information to allow a HVAC contractor to
determine load values for a house constructed using modern technology
materials, passive solar, etc. or if I'm going to have to pay an energy
consultant to spec those loads.
From your debasing answer, I'd guess you're a guy who works a wrench with
his butt crack showing, rather than one who uses a laptop and his mind.
show/hide quoted text
> >I have a few questions for those in the trade:
> >1: Does the current Manual J 8th edition include considerations,
> >calculations, and/or values for the infiltration tightness of an ICF
> >building envelope? Does it utilize both u-factor and shgc for windows?
> >If so, can it be adjusted to address passive solar gain for structures
> >designed with proper southern orientation and overhangs?
> >The windows and doors for the home have Energy star rated u-factor and
shgc,
show/hide quoted text
> >but the shgc is being spec'd high for thermal gain in the winter, with
the
show/hide quoted text
> >windows shaded by building overhangs in the summer ( northern climate
zone).
show/hide quoted text
> >I only received one of several bids requested so far, and the contractor
> >said he did the load calculations per manual J. But he sort of
tap-danced
show/hide quoted text
> >around specific questions about the calculations, and the unit size/btu
> >rating seems to me to fit a "sq.ftg./8" sizing, as opposed to an accurate
> >calculation based on r-22 ICF walls and r-40 ceilings combined with
> >geothermal and radiant/gyp. floors.
> >2. I've identified the WaterFurnace brand gshp's as the most efficient,
and
show/hide quoted text
> >have requested the bids accordingly. This contractor spec'd a Synergy3
> >unit with radiant /forced air htg/ac with a 15kw boiler. When I asked
him
show/hide quoted text
> >about why the Synergy instead of a reversible EW unit, he said forced
that
show/hide quoted text
> >water coil ac air-handlers were hard to find and the boiler was for
backup.
show/hide quoted text
> >I'm not sure how the boiler is backup, since its an all electric
> >home.........
> >I'm hoping that the other contractors bidding will be more specific/
> >forthcoming with information on how they arrived at their specs, but in
the
show/hide quoted text
> >meantime,
> >Can those with experience of combining geothermal / radiant / ac / ERV
> >comment on their approach and equipment choices?
> >Thanks in advance.
> You are just too damn funny, buddy. You want all the calc's and all
> the answers.....................For Free! Then you can get you and
> your buddy to do it on the side over a case or two of beer.
> Hit the road.
> Bubba
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Posted by Bubba on July 14, 2006, 9:27 pm
>Actually, I'm a homeowner who's trying to find a contractor that knows his
>ass form a hole in the ground.
>I'm not asking for the calcs themselves, just trying to find out if the
>manual J method has enough information to allow a HVAC contractor to
>determine load values for a house constructed using modern technology
>materials, passive solar, etc. or if I'm going to have to pay an energy
>consultant to spec those loads.
>From your debasing answer, I'd guess you're a guy who works a wrench with
>his butt crack showing, rather than one who uses a laptop and his mind.
.........and you're a whinning homemoaner who didnt get what he wanted
for free. Guess what, slim? I know how to use Manual J ..........7th
edition, ..even that data clogged POS 8th edition. Guess what else,
slim? You DONT! Sucks to be as stupid as you, eh? Now get you debasing
nose out of my butt crack. Open your wallet you skin flint. "Pay the
man".
Bubba
show/hide quoted text
>> >I have a few questions for those in the trade:
>> >1: Does the current Manual J 8th edition include considerations,
>> >calculations, and/or values for the infiltration tightness of an ICF
>> >building envelope? Does it utilize both u-factor and shgc for windows?
>> >If so, can it be adjusted to address passive solar gain for structures
>> >designed with proper southern orientation and overhangs?
>> >The windows and doors for the home have Energy star rated u-factor and
>shgc,
>> >but the shgc is being spec'd high for thermal gain in the winter, with
>the
>> >windows shaded by building overhangs in the summer ( northern climate
>zone).
>> >I only received one of several bids requested so far, and the contractor
>> >said he did the load calculations per manual J. But he sort of
>tap-danced
>> >around specific questions about the calculations, and the unit size/btu
>> >rating seems to me to fit a "sq.ftg./8" sizing, as opposed to an accurate
>> >calculation based on r-22 ICF walls and r-40 ceilings combined with
>> >geothermal and radiant/gyp. floors.
>> >2. I've identified the WaterFurnace brand gshp's as the most efficient,
>and
>> >have requested the bids accordingly. This contractor spec'd a Synergy3
>> >unit with radiant /forced air htg/ac with a 15kw boiler. When I asked
>him
>> >about why the Synergy instead of a reversible EW unit, he said forced
>that
>> >water coil ac air-handlers were hard to find and the boiler was for
>backup.
>> >I'm not sure how the boiler is backup, since its an all electric
>> >home.........
>> >I'm hoping that the other contractors bidding will be more specific/
>> >forthcoming with information on how they arrived at their specs, but in
>the
>> >meantime,
>> >Can those with experience of combining geothermal / radiant / ac / ERV
>> >comment on their approach and equipment choices?
>> >Thanks in advance.
>> You are just too damn funny, buddy. You want all the calc's and all
>> the answers.....................For Free! Then you can get you and
>> your buddy to do it on the side over a case or two of beer.
>> Hit the road.
>> Bubba
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>comment on their approach and equipment choices?
>Thanks in advance.