any feedback on the load calc?

 

VERIFICATION is necessary



HEATING load estimate being larger than Colling LOAD is Obviously NOT Appropriate for Tampa FL.

Duct load is MUCH higher than I would anticipate.

4-ton A/C unit will not provide 46,000 BTU/HR Sensible Load.
Perhaps., ~ 38,000 BTU/HR with a presumed Sensible Heat Ratio [ S.H.R.] of 0.79, IF Actual Indoor Relative Humidity < 48%.


WINDOW TINTING needs to be determined and an appropriate SHGC value established/ estimated.
____. S.H.G.C.
CLEAR __ 0.8
MEDIUM _0.5
HEAVY __ 0.3

R-walls is presumed = 5 or 6 for the Concrete construction typical in FL.

COOLCALC makes many hidden assumptions so must be verified via ' alternate calc'.
...MORE LATER.

 

Hard to evaluate your work or the program's work. Too much that we don't know.

I don't know my insulation values, but coolcalc supposedly makes intelligent assumptions based on property records and code.

So 2*4 walls? 2*6 walls? 2 pane glass? Window frames? Overhangs, shading and drapes figured in? The wall loads seem unlikely to be that high. (Compare to the ceiling loads.)

The heating load is considerably grater than the cooling load....Seems unlikely.

When you set out to buy, require a MANUAL J calculation and have each contractor explain it, comparing it to your calculations
The duct losses are considerable. What can be done about that? Discuss this with the cntractors.

Based on sensible cooling load divided by 12,000,

It is more complicated than that, That is what Manual S is about.

 

---
If WEST and SOUTH Facing Windows are not tinted, a film should be added
to significantly reduce Solar Heat Gain.
i.e. S.H.G.C. < 0.4

ATTACHMENT

_ _ LOAD CALC
... ... ... Sensible: ~ 41,000 BRU/HR - FIRST FLOOR

 

Thanks everyone for the feedback and Dan for the calculation. I will input the variables, measurements, directionals, etc. I used into loadcalc.net and share the results so you all can see the assumptions. It make take me some time...

 

I think I screwed up by treating the existing zones/systems in my house as separate plots rather than doing a whole house load calc. My mistake. I will post a new calculation for the whole house to see how I messed that one up

 

You can do the zones separately if you assume the dividing "wall" between the zones has no heat transfer. (which would be the case if they were maintained at the same temperature.)

 

That would be the case. Would I just exclude the dividing wall from the calculation then? When I went to loadcalc.net it said whole house so I thought I better just do that. And when I reviewed Dan's calculations I saw that he factored my second zone as a second floor, when it is part of the first floor. That made me think I was looking at this all wrong.

I posted the result in a new thread here to avoid any confusion with this initial calculation I did here. http://hvac-talk.com/vbb/showthread.php?2169361-revised-load-calc-for-whole-house If I should post it here instead, just let me know.