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Re: [OM] OT: Air-source Heat Pump?

Subject: Re: [OM] OT: Air-source Heat Pump?
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Thu, 6 Dec 2012 19:13:59 -0600
Chuck, you just opened up a can of worms that annoys my wife enough that I 
hear about it every Winter day.  I replaced an older outdoor pack with the 
latest from Carrier, several seasons ago.  The local dealer is reputable, 
and had his engineer review the requirements, and recommend a new unit.

In my house, the master bedroom is on the opposite end of the house from the 
heating unit.  Previous furnaces over 40 years had heated the bedroom 
adequately.  With the high-efficiency Carrier unit, the temperature of the 
air from the burner is reduced.  With the thermostat in the center of the 
house, the warm air barely reaches the back bedroom before the cycle ends. 
Hence, the room, and its adjoining bath, are forever cold, unless the 
thermostat setting is raised.

I have tried regulating with the registers and the one damper that I have in 
a branch, to no avail.  Perhaps I need to move the thermostat to the 
bedroom!

My advice is to look into such problems before you make a choice. 
Unfortunately, burner exit temperature is seldom discussed.  They just rave 
about efficiency.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Thursday, December 06, 2012 6:51 PM
Subject: Re: [OM] OT: Air-source Heat Pump?


> My 19 year old gas furnace is scheduled to be replaced next Tuesday with
> a newer, 96% efficiency gas furnace.  Was I pursuing noble goals with a
> more efficient device?  No, just trying to avoid death. :-)
>
> It appears that the old furnace has small cracks in the heat exchanger
> and is releasing small amounts of CO into the house.  Not enough to set
> off the CO detectors yet (only 3ppm measured next to the heat exchanger)
> but worrying for the future nonetheless.
>
> This is a known problem with this Lennox Pulse model furnace.  The Pulse
> designation comes from its operation as a continuous series of tiny
> explosions (sort of like a ram jet).  The vibrations may eventually
> induce cracks in the heat exchanger and they finally have.  Fortunately,
> there's another year left on the 20 year warranty.  Unfortunately, there
> are no replacement heat exchangers.  So I'm getting an $1,100 rebate
> from Lennox on the cost of a new furnace.  Even so it's still $3,300 of
> unexpected expense. :-(
>
> Chuck Norcutt
>
>
> On 12/6/2012 7:14 PM, Rob Harrison wrote:
>> We are just now in the midst of an energy retrofit for our house that
>> includes replacing the 1973 gas conversion burner on the original 1950
>> boiler (50% efficient) and 1994 electric hot water tank with a new (95%
>> efficient) condensing boiler and indirect-fired hot water tank, as well 
>> as
>> air sealing and adding R-60 insulation to the attic, and new Energy-Star
>> refrigerators for us and our mother-in-law apartment. Through a local
>> program, Community Power Works, we were able to get a low-interest loan 
>> to
>> do the work. The loan is repaid on our City Light electric bill. The
>> savings we'll get will easily pay for the loan now, and we will be better
>> off as energy rates increase over the life of the loan. If we sell the
>> house, the loan can stay with the house. This gets around the whole 
>> "simple
>> payback" issue.
>>
>> In my practice ground-source heat pumps rarely have made sense. 
>> Air-source
>> heat pumps are so much better (higher COPs) and less expensive these 
>> days.
>>
>> Rob in Seattle
>>
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