[Greenbuilding] RE Drakes Landing solar storage

JOHN SALMEN terrain at shaw.ca
Wed Jan 12 20:45:31 CST 2011


Water storage is always about $1 per gallon so a tank would be 2000 -
insulation (24" of geofoam wrap for that tank - approx r100) would be at my
cost about 4000 and I think an 8 panel installation with the tank would run
about 15000 for an approved installation. So if you were lucky about 20K
which probably about what a 6kw pv grid connected installation might run at
this point. Realistically though a 4 panel installation (which is typical
for DHW) with 1000 gallon of well insulated storage might be a reasonable
approach as there is a lot of wastage in that kind of SHW installation. 

 

JOHN SALMEN ENVIRONMENTAL DESIGN

4465 UPHILL RD,. DUNCAN, B.C.  CANADA, V9L 6M7

PH 250 748 7672 FAX 250 748 7612 CELL 250 246 8541

terrain at shaw.ca

 

  _____  

From: greenbuilding-bounces at lists.bioenergylists.org
[mailto:greenbuilding-bounces at lists.bioenergylists.org] On Behalf Of
jfstraube
Sent: January 12, 2011 5:38 PM
To: Green Building
Subject: [Greenbuilding] RE Drakes Landing solar storage

 

Sacie, I just looked at the Drake Landing site

It is -20C and has been below -15 or so for a while

Looks like the 52 houses are drawing 310 or so kW.  This is about 6 kW per
house or 20.5 kBtu/hr for a -4F temperature and 1500-1800 sf above-grade
house square footage.  That is not bad, but it could likely be dialed down
by 25-50% with a reasonable upgrade in insulation  windows, airtightness.

They have two tanks, each with almost 30 000 gallons. So that works out to
60000/52= 1150 gallons per home.  If you check the annual report, 80% of the
solar energy put into the ground is lost, but over 95% of the energy put
into the tank is able to be used.  So maybe 2000 gallons might be enough for
one home, and should be enough for a super insulated one.

Note that they have 8 solar panels of about 4'x8' each to collect the heat
(that aint cheap either).

 

Your questions got me thinking.

On 2011-01-12, at 12:09 PM, Sacie Lambertson wrote:





Thanks John, possible to use a central tank and find such savings in a
single house?  How large a tank are we talking about?  S

On Wed, Jan 12, 2011 at 11:03 AM, John Straube <jfstraube at gmail.com> wrote:

I have friends who worked on this.  The houses are all R2000.  It would have
been more economical to insulate better.. and just using the central tank,
no ground loop, would generate most of the savings with far less cost.

The overall system is very expensive.

Check under publications for the newsletters

 

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John Straube

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