Very good, Dan.Originally posted by dan sw fl
Simplifying___Originally posted by mrbillpro
... 5200 sq. ft. homeOriginally posted by uktra
Do we have the correct imput on our calcs and do we design the house for the few days of abnormal conditions?
... a lot of occupants or a lot of parties call it abnormal conditions may be perfectly normal to some and you brought up a good point as to why you can't totally rely on old J & D. ...
[Edited by mrbillpro on 06-29-2005 at 10:37 PM]
Windows ......11,000 BTUh ( 600 S.F. + )
Ceiling....... 6,000
Walls......... 5,000
Floor......... _____
Duct ......... 4,000
Infiltration . 4,000
Internal Gain. 4,500
People ....... 3,500
TOTAL ........38,000 BTUh +++
_______ THAT'S in a PERFECT (VIRTUAL) WORLD.
35' x 70' = 2,450 x 2 = 4,900 S.F.
How does one get < 4-ton to maintain
77'F at 92'F outside temperature?
I suspect that a _4-ton may cool home
to _14'F less than the Outside Temperature.
& __5-ton _17'F
Window area as stated
( Glass to Floor area ratio = 11% )
DOES lean towards a
"Cave Like" Environment.
NOTE that this VIRTUAL house has ONLY 75 S.F.
of glass on the EAST and WEST Sides.
.. Just Ain't GOING TO HAPPEN IN REALITY
... perhaps, a 1 in 280,000 real world chance.
This is a GREAT THREAD
which ENABLES people to _STRETCH Their VIRTUAL Minds.
However, most people visiting HVAC-TALK forum
will need to STAY IN REALITY.
I used a 15% glazing ratio on the first floor and 10% (code minimum) on the second floor. This should be quite satisfactory for those interested in lowering their utility bills. Putting most of the glazing on the north and south just makes good sense if the orientation and interior layout of the house permits.
But you don't say whether your figures are sensible or total. You seem very high on the ceiling, duct losses, and internal gains that you don't explain. I used R-38 for the attic and J7 duct losses only for the 2nd floor.
I suspect you never use manufacturers' engineering data to select equipment. This is a major mistake by most people in the HVAC industry. I suggest you take a look at some, as it can be very enlightening. You also might get a copy of ACCA Manual S; it's an outstanding booklet that explains all sorts of things that are usually ignored.