ASHP with heat battery

70sbudgie

Solarchaser said:

Reed_Richards said:

waqasahmed said:

Thanks. I guess that's why you might wanna go for a sunamp instead (or several sunamps) because of the ability to work with lower flow temps? 

I think you are missing the point.  If you heat your thermal store to 60 C then volume-for-volume a Sunamp will store a good deal more heat than a tank of water.  If you heat your thermal store to 85 C then volume-for-volume the percentage difference in storage capacity between a Sunamp and a tank of water is reduced.

@Solarchaser , what's the "conversion loss" for your tanks of water?   

There should be a theoretical zero conversion loss, or 100% conversion rate for the tanks, as the heat is applied directly to the water through the immersed heaters.
In reality there will be a bit lost in the wiring and connections to the heaters, but that said, id imagine less than 1%.

So if it was purely conversion, water tanks win hands down, however when it comes to storage after conversion,  the sunamp wins hands down as it stores it in a much smaller physical volume and we (I) think it should be inert at those stored temperatures, vs the tanks constantly losing heat. 

So if you were heating to use straight away (short time frame) then water tanks are clear winner's, but if you are storing for longer time (weeks??) The sunamp would be a clear winner, where the lines converge I've no idea.
I guess when the tanks lose 15% of their stored heat, which for me would be probably about 8C, and that would likely be just over 24 hours in their current configuration 
That's still falling back to that one instance in a video that I caught the 85% conversion,  that I've found no proof of.

Using a sunamp just for heat might work, as it would give a constant supply of a set heat for a defined amount of time.
Potentially stored for long periods of time.

I've edited my comment above, I am quite certain that 85% was mentioned for Caldera,  but I can't find anything saying that now.
Their brochure says 98-99% conversion and stsnding losses of just under 5kwh/day

Wow, that is a bit of a beast! Electrically and physically. I look forward to seeing how it develops and what a smaller version looks like. 

From the website "We are currently not making Warmstone for homes while we develop an industrial product."