12-13-14, 08:54 PM | #21 |
Suncatcher
Join Date: Sep 2008
Location: Spiritwood, Northern Saskatchewan
Posts: 42
Thanks: 0
Thanked 1 Time in 1 Post
|
Setting out to burn NG is likely to encourage fracking, but I love the idea otherwise. I'm appalled that we can't buy NG heat pumps based on free pistons, without all the extra parts. Electronic valve control is making it easier to opmimize, too. Having the waste heat to temper the intake should make things easy.
|
12-13-14, 09:27 PM | #22 | |
Supreme EcoRenovator
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,004
Thanks: 303
Thanked 724 Times in 534 Posts
|
Quote:
It just makes me crazy, absolutely crazy, when old guys use bold print... Feast your elderly eyes on this. Sincerely, -AC
__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker... |
|
12-14-14, 06:14 AM | #23 | |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
|
Quote:
|
|
12-14-14, 06:23 AM | #24 | |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
|
Quote:
I find a lot of engineering articles still use water temps and boilers running at what we would have seen 20-30 years ago. 80% efficient copper fin boilers, as though they have never heard of low temp radiation or condensing equipment before. So much for real energy reduction. |
|
12-14-14, 06:36 AM | #25 |
Apprentice EcoRenovator
Join Date: Nov 2013
Location: Moore Oklahoma
Posts: 267
Thanks: 108
Thanked 23 Times in 21 Posts
|
Disappointed it's only for hot water. Would have been nice if they also had chilled water output. The real key is sizing it down to a residential scale.
|
12-14-14, 08:07 AM | #26 | |
Lurking Renovator
Join Date: Jul 2013
Location: central MS
Posts: 23
Thanks: 2
Thanked 3 Times in 3 Posts
|
Quote:
Charlie |
|
12-14-14, 09:36 AM | #27 | |
Supreme EcoRenovator
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,004
Thanks: 303
Thanked 724 Times in 534 Posts
|
Quote:
With heat pump application, you get the added benefit of "wasted heat" from the engine & exhaust. -AC
__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker... |
|
12-14-14, 10:10 PM | #28 |
Journeyman EcoRenovator
Join Date: Jul 2014
Location: Austin, TX
Posts: 314
Thanks: 39
Thanked 50 Times in 45 Posts
|
With 96% efficient natural gas furnaces I don't see there being much room for improvement for the complexity of running an engine to drive a compressor for the heat pump cycle. Gas furnaces are reliable because its a very simple concept, fire and hot air. It seems you are considering this more for cooling and reducing your electric usage or in lieu of electricity. It might make more sense to use a NG powered generator to run your hvac. And try to capture the exhaust heat into hot water. The york units had briggs and straton motors. I don't think these motors were considered efficient. From a technician's stand point I wouldn't want to repair a york triathlon, sounds very specialized and proprietary.
|
12-14-14, 10:32 PM | #29 |
Supreme EcoRenovator
Join Date: Sep 2012
Location: Vancouver Island,Canada.
Posts: 1,037
Thanks: 116
Thanked 100 Times in 87 Posts
|
The problem with a 96% efficient gas furnace is in the method they are using to get the efficiency number, I fathom.
The heat loss threw the rear vent would need to be factored in to get a idea of its efficiency. I am not a pro on the subject I feel about 40% ? of the heat is being lost out the back vent. They do breath I am thinking a heat recovery unit off the vent would prove to improve the efficiency number to more of its true potential. |
12-14-14, 10:51 PM | #30 |
Journeyman EcoRenovator
Join Date: Jul 2014
Location: Austin, TX
Posts: 314
Thanks: 39
Thanked 50 Times in 45 Posts
|
Generally the name plate ratings show input btu and output btu to derive the efficiency. I am curious about under what conditions and runtimes they do their tests. The usual testimony for 96% furnaces are the lukewarm to touch pvc flues. Cant imagine too much heat escaping through that lukewarm pipe.
|
|
|