Type: Posts; User: dan sw fl
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INCORRECT ... 2.5 TON DOES NOT PROVIDE > 32,400 SENSIBLE CAPACITY
Of course, R.H. will be frequently be > 50% when indoor temperature is less than 74'F.
WHAT IS MISSING
... IS THAT IT _ _ THE WOOD IS TOO DRY_ _, RELATIVELY, OF COURSE.
+ 72'F and 45% R.H....
The THERMAL and ENERGY COST$ Balance Points need to be determined based on:
YOUR THERMAL Building Envelope
YOUR SPECIFIC Heat Pump Characteristics
YOUR LOCAL environment ( Heating Degree Days -...
Sheet metal and duct tape are appropriate materials
ONE YEAR as measure of coil longevity is QUITE FEEBLE.
4 tons unit will likely only provide about 35,000 BTU/HR of SENSIBLE Capacity.
38,861 BTU/HR is your required per analysis.
Your target for sizing needs to be the
_ Sensible Heat Gain _ for...
_ So Far_, It's ONLY The Equipment that is DEAD.
_ At some point, one's luck will run-out.
_ Don't Be a DEAD HEAD.
Depends on locale ...
Maximum MN has little to do with actual Design Conditions.
ASHRAE 2009 FUNDAMENTALS
______ Wet Bulb (WB)
___________ Mean Coincident Dry Bulb (MCDB)
0.4% __ 78.2 ___ 86.3
1.0% __ 75.9 ___...
HVAC PERFECT =
> 90% of the time.
If Two bidders performed a Manual J calculation that determined 4-ton, I'd opt for a 4-ton.
If you're not convinced, you need to have an energy auditor for visit who is INDEPENDENT
When was condo built?
1983 or 2003
Is your unit on the 1st, 2nd or 3rd floor?
Total # of floors __?
One common wall - North
SOUTH WALL about 40 to 42 FEET.?
East & West walls about 26...
Contractor # 3 obviously will provide a more appropriate system.
What is realistic for Undersized 2nd floor Duct for the original house?
I believe that a fully stretched...
AMANA = Goodman
AS ALWAYS, IT DEPENDS
on the Set-up
and Technician's ability
COMFORT IS DEFINITELY A WIDE RANGE ___ ASHRAE Std. 55
USE CEILING FAN or Four of them.
NEW DELHI INDIA
_____ WET BULB __
_________MEAN COINCIDENT DRY BULB
........... WB __ M.C.D.B.
0.4% .. 85.4 __ 91.2
1.0% .. 84.3 __ 90.1
Nothing in Brazil > 83.2'F WB
83.5 'F Wet Bulb at 90.5'F Mean Coincident Dry Bulb (M.C.D.B.)
the highest ASHRAE humidity Design Conditions for MISS., FL, TX and LA
New Orleans LA
101'F 70% Relative Humidity might be for some locale outside the U.S.
I am fairly certain 92'F Wet Bulb and 89'F Dew Point
do not exist within the 48 states ( even for ASHRAE 0.4% Design...
Air leakage and window film will have the greatest impacts.
Impacts could easily be more than 1 ton in some situations.
............... ______ See above
Air flow and static pressure measurements will tell you if the duct system is close to what it should be.
It is Not likely that 2,000 CFM is actually being...
NO. The t-stat is Set TOO LOW.
Windows 120 sq feet U 0.67 SHGC 0.7
Infiltration 150 CFM
Duct R-4 in 150'F attic
____________ 34,600 BTU/HR sensible Heat Gain at 111'F
1978 built 1,600 Sq Feet in AZ...
1. Airflow ( CFM)
2. Superheat ('F)
3. Sub-cool ('F)
4. House Age
5. Number of windows ... ??
Was a pressure test performed on the duct after new heat pump? ...