[OpenTRV-dev] [OpenTRV-interest] Storage heating, dynamic demand, and OpenTRV

Mon Sep 8 11:33:37 BST 2014

One of the reasons that I feel slightly smug about my E- and W- facing arrays is that I at least smear my exports over a much longer period in summer!  %-|P

Dynamic demand control I think can help a lot with intermittent sources, but it needs more thought.



PS. I wrote this some time ago, but things move on quickly: http://www.earth.org.uk/note-on-dynamic-demand-value.html

On 8 Sep 2014, at 11:17, Mark Wigmore <EMAIL ADDRESS HIDDEN> wrote:

> Your thought experiment does highlight a major issue with variable renewable energy sources. Having worked in wind energy it quickly became obvious that there needs to be suitable hardware between the generator and the grid for load balancing. The generating unit needs to appear to the grid as a source that can respond to demand fluctuations. Off grid systems normally require banks of batteries, which seems to be sensible for grid-connected systems also. Otherwise in the middle of the day all the south-facing PV arrays are generating loads of power that's just not required!
> Mark
> On 8 September 2014 11:00, Damon Hart-Davis <EMAIL ADDRESS HIDDEN> wrote:
> Hi,
> The key thing I’m aiming for here is short-term controllability to balance second-by-second flows in/out of the house, plus storage to carry that energy to a more useful time.
> Thus an electric storage heater rather than a normal one.
> Your DHW idea is in principle fine if done right, but storage in water isn’t plausible for everyone.
> Anyhow, only a thought experiment, so good to thrash it out!
> Rgds
> Damon
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