11-21-13, 09:42 AM | #11 | |||
Supreme EcoRenovator
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,004
Thanks: 303
Thanked 723 Times in 534 Posts
|
Quote:
Your HDD value came out to be 4886, which surprised me, as it is just a tad cooler than there in Portland... guess it must be an ocean current issue. Anyway, as if you didn't already have enough data, here is how the average HDD from the last five years graphed out... Also, your temperature data looks quite favorable... Quote:
Quote:
I played around with the Carnot Efficiency equation, as it relates to heat pump COP curves, and I found out that heat pump efficiencies are more sensitive (in a favorable way) to small improvements in radiant floor efficiencies than fossil fueled systems may be. > ...and they predict 17k BTU/hr loss in the worst case. This is lovely. I don't know what your typical solar exposure is, but this makes you a good candidate for solar. It also opens up a good opportunity for ASHP-to-water providing heat for your slab. Your worst low air temperature is very ASHP-friendly. It also puts you in the rare category of people (like me), who want to strangle every last efficiency possible out of their heating system and want to go GSHP. It may be good news or it may be bad news, but you are going to have trouble finding a commercial water-to-water GSHP that is small enough to heat your home most efficiently. So don't forget where the Homemade Heat Pump Manifesto is. On with the show... Best, -AC_Hacker
__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker... Last edited by AC_Hacker; 11-21-13 at 10:00 AM.. |
|||
Tags |
diy, heat pump, hydronic, pex, radiant |
|
|