I had 3 customers that were my data source. unfortunately, I had trouble
monitoring the thermal systems and they got tired of me coming over daily
to see the runtimes ect one gave up on solar thermal when a leak occurred,
The other two I stopped monitoring because of expenses in the monitoring of
That would be a good analysis to share. I can see how it could be
possible with lower module costs, but I haven't seen any studies on this
comparison. Chris
On 3/15/2018 1:17 PM, Darryl Thayer wrote:
When I did my study of solar water heating I found that PV water
heating gave more hot water
When I did my study of solar water heating I found that PV water heating
gave more hot water at a lower cost than solar thermal. the Heatpump water
heater was the big winner.
On Thu, Mar 15, 2018 at 12:00 PM, Drake <
drake.chamber...@redwoodalliance.org> wrote:
> This discussion has been a
This discussion has been a great help. The house
is built and the plumbing is in, but could be
modified. Wood stoves are not a likely solution.
I think we need a different water heating strategy.
Thank you all!
Drake
At 09:21 AM 3/15/2018, you wrote:
Content-Type: multipart/alternative;
Sorry I could not find much data but here is what I found
Here is some of my data, take with a grain of sault.
Well pump ½ hp drawdown 60 feet, start surge 1500 Watts running watts 500
watts runtime 25 seconds 40-gallon bladder tank. 40 to 60 PSI.
Two people in the house about 60 years old,
Drake,
It would help to knowis this duplex already built? and
considering where you live, is a woodstove being considered for space heat?
Bill
Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
www.frenergy.net
This is what I came up with:
The calculation is Q = mcp delta T
Water Temp out = 120
Water Temp in = ground source Temperature @ 50F?
delta T = 70F
m = mass flow rate. ASHRAE is the source for this. 20gals per person
per day = 20 gallons x 8.34 lbs/gallon = 167lbs/day/person
cp = 1
Drake--
The kWh numbers are reasonable. A few years ago, I metered our hot water heater
for a family of three and we were using an average of 10kWh/day--about
one-third of our electric bill. A heat-pump water heater will reduce the kWhs,
but they cost more and are louder. A better insulated
Barton makes a good point with regards to the incoming ground water temperature
and the amount of heat required to bring it up to shower temp. My recollection
is that ASHRAE states 20gal/person/day for the first 2 people, then 15gpd or
12gpd thereafter. However those rates vary wildly with
DrakeWe have used 40 to 80 gallon water heaters mainly the Rheem Marathon
electric units, we used 15 minutes per person twice a day on the timer, we did
use 7 day timers to have different start times on the weekends. We had great
success with that as a base line.Jerry
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