[Greenbuilding] Heat pump HWS
Nick Pyner
npyner at ihug.com.au
Sat Apr 23 20:59:25 CDT 2016
I wondered that too, particularly as I believe Nick Pine has been
spruiking a hell of a lot of numbers lately, but he clearly quoted me at
the bottom of his post.
Nick Pyner
Dee Why Beach NSW
On 24/04/2016 2:57 AM, Stephen wrote:
>
> I think he was referring to Nick Pine!
>
> *From:*Greenbuilding
> [mailto:greenbuilding-bounces at lists.bioenergylists.org] *On Behalf Of
> *Nick Pyner
> *Sent:* Saturday, April 23, 2016 12:43 PM
> *To:* greenbuilding at lists.bioenergylists.org
> *Subject:* Re: [Greenbuilding] Heat pump HWS
>
> Hi Bob
>
> There is nothing particularly detailed about my figures and there is
> not much in the way of calculation! It is all simply an extension of
> about fifteen years of work with grey water heat exchangers. I have a
> standard Rheem electric storage heater with its own exclusive kWh and
> water meters. The heat exchanger works with a Maddalena heat meter
> which gives a daily output in kWh and total water flow. The testing
> arrangement is not ideal but I do know _exactly_ what is going on!
>
> I think it is a big mistake to try to plan for "just enough panels"
> for your HWS. You are bound to get it wrong, and your wife will be far
> from impressed.
>
> The reason why I am looking at 3kW of panels is because that is all
> that will fit in a single group on a north-facing roof. That's real
> planning for you - architecture and environment, not numbers.
>
> The 3kW means I only need about 1.5 hrs of peak power equivalent, so I
> can be reasonably confident of getting that regularly, particularly as
> the roof is pretty ideally pitched at 45 degrees. It was actually
> built to take a (gasp!) solar thermal HWS, but that never happened.
> For all that, I don't think the HWS is so important since, if it was
> not on solar, it would be getting power off-peak after 10pm. Far more
> important is the stuff that has unavoidable daytime demand - the
> fridge, the stove, and winter space heating. If you want to do some
> serious planning, that is the place to look. All I have done there is
> confirm that the energy label on the back of the fridge was correct on
> an annual basis, and all that really meant was that getting a new one
> is not such a high priority. Your power bills should tell you all you
> need to know.
>
> Nick Pyner
>
> Dee Why Beach NSW
>
> On 23/04/2016 11:48 PM, Jake jakaitis wrote:
>
> Helpful to understand how you arrived at these numbers?
>
> I am interested in starting out my PV system with just enough
> panels to power my new energy efficient whirlpool hot water tank. T
>
>
>
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