[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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