Robur HP Data

Unknown

here's the project mostly explained.

http://www.achrnews.com/CDA/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000364125

Results I have are insufficient due to the big change between Feb and March that is apparently the result of my widening the differential on the DDC. They do represent a fair example of what the system may be able to do. Next season will tell more. Keep in mind the gas figures include DHW and cooking PLUS they have gas fireplaces and I have to wonder if they used them a lot at first but then cut back when the bills started rolling in. Also we are heating the basement to 67* and garage to 55*, total heated space 12,000 sq ft. Currently my setpoint is 112* on the water, I bumped it up from 110* a while ago.

So:

11/29/07- 1/02/08 (Dec) 1011 Degree Days, 34 Bill Days, 31* avg temp = 519 CCF

1/02/08-1/31/08 (Jan) 1032 DD, 29 BD, 31* avg = 424 CCF

1/31/08-3/03/08 (Feb) 972 DD, 32 BD, 31* avg = 488 CCF

3/3/08- 4/2/08 (Mar) 807 DD, 30 BD, 39* avg = 153 CCF

4/2/08-5/2/08 (Apr) 441 DD, 30 BD, 52* avg = 149CCF

5/02/08- 6/02/08 (May) 275 DD, 31 BD, 59* avg = 117 CCF.

Figure ~ $100 for electricity during the high load months for this particular project. You can see the major drop in usage even though the DDs were only tapering off. I find this info to be fairly promising but obviously these units need to be dialed in correctly to function at optimum levels. One other note is in the month of March 07 they used 359 CCF compared to 153 CCF this March with only 1* difference in avg temp. One problem, they waited 3 months to call me and complain about the high bills. I wish I could have gotten to it sooner.