Type: Posts; User: dan sw fl
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IT ABSOLUTELY DOES,
the HOME-OWNER provides
.......................... _THE APPROPRIATE_ Building Thermal Envelop and Historical Energy Use information.
Of course, one has to have some...
Keep It Simple:
2-Ton Heat Pump with two 3-kw heat strips
______________ 4,400 Heating Degree Days (HDD) in Northern VA
14'F Design Temperature per ASHRAE
Heat Pump will provide > 80%...
Load Calc is _a Farce_ or ONLY An Example if you will.
It HAS NOTHING to do with Reality.
I sent Contractor RECOMMENDATION in an E-MAIL.
No MORE so than Trane/ American Standard, Carrier/Bryant or Lennox/ ...
4th one on the list
An appropriate response would involve the SYSTEM PERFORMANCE involving more than a dozen parameters, not a brand evaluation.
Basement should be one zone.
First Floor should be one zone.
= 2 zones on 1 system
60,000 BTU/HR Furnace _might be_ Adequate.
Two-stage should be investigated.
Heat Loss is calculated in the range of 55,000 BTU/HR (Attachment)
2,800 Sq Feet
30 years old
They don't call it
WAR RANT Y for No reason.
Measure the CO continuously
with an AUTO low ( 20 ppm) alarm setpoint.
T-stat is lowered to 75'F to have slightly longer run times.
My Relative Humidity has increased to only 46%
............................ (usually 40% in the Summer with t-stat set at 78'F).
YOU might be able to get a calibrated thermostat to within 1'F for about 170 bucks.
,,...................................... ,, RA .. 68'F
'F _k BTU/HR Dt RA Temp + Dt
47 _23.30 __ 23.971 ___ 91.971 xxx 10 =...
You can figure +/- 15% for a Manual J calc.
and +/- 30% on the equipment and air flow distribution system.
AND even with that + A LOT OF EXPERIENCE & SKILLS have a
PERFORMANCE that the...
Looks like Texas is fairly FAR BEHIND THE TIMES
when updating their residential code requirements.
Are you considering a heat pump?
How many Heating Degree Days (HDD) in your locale?
_Sounds like_ existing furnace might be a lot larger than _ in the range of 60,000 BTU/HR
ONLY 20,000 BTU/HR might be More Than sufficient.
YES, it could be more than 3 X too large
My "adjusted bid" would be less than 80% of the asking price.
OF COURSE, there are a lot of Other houses.
I am absolutely NOT going to pay top dollar for a hou$e with a nearly 30 Year Old HVAC System.
+ it would force me to take a FINE TOOTH COMB approach to REVIEW of ALL Appliances, roof, ......
If properly maintained, Why Not?
Moderate Winters is not very explicit.
Rarely goes below 38'F?
Never goes below 28'F?
I am not aware of...
Are you in Oregon?
Yes, you may have someone to discuss YOUR Situation.
Steps outlined ...
Your BEST advice for the Pacific NW will come from Travis Smith at SKYHEATING in PORTLAND OR
It seems like both are providing reasonable...
Have a local auditor test your home.
Typical C.O.P. at 15'F = 2.5
ATTACHMENT page 12
It just seems that you may have a death wish.
Everyone here has their FIRST PRIORITY = SAFETY
. L I S T E N....
Air change per hour as stated is _10 X normal_.
Equipment size is about 3X what is actually required.
.... 100,000 BTU/HR Output versus 34,000 ....
Run times are Obviously going to be minimal.
34,000 BTU/HR HEAT LOSS at 10'F
One would expect run time to be about 15 minutes per hour the majority of the time
for a 125,000 BTU/HR - 80% efficient furnace
using ~ 840 THERMS per year with 4,960 Heating Degree Days...
125,000 BTU/HR / 80% Furnace
Run time __ Outside
per hour ___Temp_ Heat Loss
13 Minutes _ 40'F _ 21,500 BTU/HR
18 Minutes _ 30'F _ 28,700 BTU/HR
22 Minutes _ 20'F _ 35,900 BTU/HR
Gas use should be < 240 Therms in the coldest month and 1,080 therms per heating season
TYPICAL FOR JEW JERSEY
5,000 Heating Degree Days for season
1,100 Heating Degree Days for coldest month ...
125,000 BTU/HR would need
Two 16" Returns or One 22" diameter Return.
Furnace is at least TWICE TOO BIG.
50,000 BTU/HR would normally be MORE THAN...
It will only cost a few/several hundred bucks to set it up one way, only to
have it set back to - - - - P E R F E C T - C O M F O R T - - which is What YOU Have today.
YOU will likely find out that the OFF period is increased when USING only HIGH stage
...........................___ .. :whistle: .. _____________
...... which ACTUALLY results LESS Comfort for the...
_ Pseudo -Engineers _
OR still students.
if you don't Know what I Mean,
__________________ :whistle: ____________________
I don't understand How there are Two Simple (non-communicating) thermostats
set-up on ONE furnace.
The range of a thermostat & heating/cooling system
ought to be considered about 3'F on some older equipment
and with the inherent limitations of air distribution performance.
If one wishes to...
Are you close to the Atlantic Ocean?
I wouldn't Select the C HEAPest Equipment and Contractor
Is the thermostat set at 69', 76' or 81'F?
Everything sounds just about PERFECT.!.!!!
What is the relative humidity?
ASHRAE DATA 2009 EDITION
MEMPHIS INTERNATIONAL AP 35.06N 89.99W
99.6% ___ 99.0%
__ 17.0 __21.7'F
DB = DRY BULB WB = WET BULB
DB / WB
In an attempt to not use some select 4 letter words,
let me just say: Calc is bogus.! A Shame.!
______________ unless, of course, you have something like: > 1,500 feet of duct in a 180'F [-10'F ]...
Using previous winters ( NOT last year) average and an arbitrary 8% for hot water use,
the heating oil usage is 680 gallons given 5,200 HEATING DEGREE DAYS (HDD)
Given my correlation of the...
1,500 square feet salt box in Western KY ...
not a lot of information.
...HOWEVER, Heat Loss = ~ 30,000 BTU/HR ____ 70 - 14'F = 56'F = dT
................ HEAT GAIN ~ 23,000 BTU/HR ......