Heat loss calculations HELP !

Mike T., Swampeast MO

With HVAC-Calc I get about 10,700.

10°F winter design for Suffolk County.

Used R-11 for ceiling as a roof/ceiling combination. From the measurements I gather that there's a peak in the roof with base 10' wall height.

Included nothing for the inside walls; used 30°F temperature differential for the garage wall.

Used 3-60" x 80" French doors and 2-60" x 80" windows on the large wall. (166.5 sq.ft. total)

Did consider the garage side of the slab as a perimeter loss, but not the two inside walls.

"Average" infiltration.

Nick_23

Heat loss calculations HELP !

Heat loss calculations HELP !
I need help calculating heat loss for a Sun/Florida Room addition. I have received three different numbers from three vendors

i am on Iong Island, NY

Room description

Size: 21’ X 8’

wall (1) 252 sq’ inside wall (1’ Plaster, 2x4 16” on center stud, R13 insulation, 5/8 wood boards, 1/2 sheet rock.

wall (2) 80sq’ inside wall ( 1/2 sheet rock , 2x4 16” on center stud, R13 insulation, 1/2 wood boards, ½ sheet rock. One French door ( 60” X 80”

Wall (3) 80sq’ Garage wall ( 1’ Plaster, 2x4 16” on center stud, R13 insulation, ½ wood boards, 1/2 sheet rock. One insulated wood door (30” X 80”)

Wall (4) 168 sq’ large glass doors and glass panels (double glazed)

Roof - 187 sq’ asphalt shingles (no attic space) R13 insulation ½ sheet rock

Floor – laminated wood flooring, poured concrete on grade, not insulated

Unknown

long island

Long Island have sun there? Thought it was island of ice, where did the the "long island ice tea" comes from.... Kidding asides, the other wallies will help you out on this heat loss, my main concern is the concrete slab, hope you are some insulataion on top of it to increase the comfort level as well decrease the heat loss...

Brad White_9

And the slab EDGES too!

Edges are a tad more critical. Absent insulation you can run 75 BTU's per linear foot for uninsulated slab edges. Daffodils in February as Dan noted...

I may take a crack at this when I free up. No promises though.

Brad

Nick_23

Thanks

Jed_2

What is

the method of heating this space? Is it embedded PEX tubing, baseboard radiation, fan coil? Convective air based heat loss vs. radiant heat loss analysis might yield different numbers. Just curious.

Jed

Robert O'Brien

Using 8' for ceiling height,I get 11,620

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NIck_24

Heat loss calculations HELP

Robert
I was planning on using Myson radiators, but I am open to other solutions.
Also how did you come up with 11,620 Btu’s?


Thanks Nick

NIck_24

Heat loss calculations HELP !

Jed

I was planning on using Myson radiators, but I am open to other solutions.

Thanks Nick

NIck_24

Heat Loss

I would like some one to double check my Heat loss calculation I have used the slantFin software to calculate the heat loss. I have attached the file to this post

Thanks

Mike T., Swampeast MO

One additional comment.

Sure sounds like only 3 1/2" of "high density" fiberglass in the ceiling yet ceiling height [seems] VERY generous.

Were this me I would HIGHLY recommend MUCH BETTER INSULATION IN THE CEILING!!! Even 1" of rigid insulation applied to the under side of the rafters will help immensely and any decent drywaller won't have too much of a fit...

I sure hope that there aren't any recessed lights in that ceiling! If so, say goodbye to most insulation value and say hello to the opportunity for ventilation problems in a climate where heating load dominates!