[Greenbuilding] Heat pump HWS

[Nick Pyner]

I am in the process of installing 3kW of PV  which will inter alia be 
connected to a fairly new electric storage heater. I can hardly claim it 
to be my own idea, but it is my own money.   The heater takes 4.6kWh/day 
of electricity @ about 10c/kWh off the grid, which is about 65% of the 
total demand, the rest coming from a grey water heat exchanger.


On 23/04/2016 1:51 PM, Antonioli Dan wrote:
> So where are the numbers?
>
> Are you willing to invest in your own ideas, spend your own money? 
> Report back?
>
>
>
>
> On Apr 22, 2016, at 8:45 PM, Nick Pyner <npyner at ihug.com.au 
> <mailto:npyner at ihug.com.au>> wrote:
>
>> Ah, now that IS interesting. Because the NSW certification rated 
>> heatpump highly, I assumed  the testing was all done. I'm sure this 
>> is true from a simple energy standpoint, a COP is a COP, but that is 
>> all the energy certification is interested in, and it doesn't reflect 
>> the bigger picture.  The controversy I alluded to has been brewing 
>> for some time and it all hit the fan with with the release of a 
>> Regulatory Impact Statement in 2013.
>>
>> http://www.energyrating.gov.au/document/consultation-regulation-impact-statement-heat-pump-water-heaters
>>
>> and background
>>
>> http://yourenergysavings.gov.au/energy/hot-water/heat-pump-hot-water
>>
>> The certification work I do is a minimum standard. I have never 
>> needed to call for heat pump. If PV goes in, a plain-vanilla storage 
>> heater more than suffices.  I was looking into heat pumps on a job 
>> but I found the manufacturer excluded alpine areas over 1000m, and 
>> there's me, you guessed it, working on a ski lodge at 1700m.  I 
>> subsequently found that Rheem make no such distinction and claim(ed) 
>> their included resistance heater was unique. Not true, Bosch have one 
>> too.
>>
>> I can't see why you would ever programme a heat pump to use electric 
>> only. It is only there for backup and should not require human 
>> intervention.
>>
>> The game seems pretty shambolic.
>>
>> Nick Pyner
>>
>> Dee Why Beach   NSW
>>
>>
>> On 23/04/2016 1:34 AM, Antonioli Dan wrote:
>>
>>>  I’m looking into hybrid models that allow you to program the tanks 
>>> to run on heat-pump only, electric only, and both.
>>>
>>> But with heat pumps now all the rage what I’m looking for are solid 
>>> numbers, not hypothetical calculations.
>>>
>>> On Apr 21, 2016, at 9:32 PM, Nick Pyner <npyner at ihug.com.au> wrote:
>>>
>>>> Indeed I have. I was unsure about raising them because of climate 
>>>> considerations, but the essential principle is the same anyway.
>>
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>
>
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