Posted By Dana1 on 06 Jul 2017 09:15 PM
Like you, I'm more than just a bit skeptical about the economics of the thermal battery/ ice storage tank folks, but threw it out there simply as an existence proof that ice storage is being done in space heating apps, not just cooling apps. They claim it's cheaper and more efficient than drilling for it and using standard GSHP + PV, but I've never seen them show the math.
I don’t know, you seem to throw a lot of things out there, and there is not much substance to it. Maybe you could be a bit more constructive and actually add something of merit to the subject.
Posted By Dana1 on 06 Jul 2017 09:15 PM
The 561 kwh of storage per house is too ridiculously overstated to take seriously. Large temperature differences between the land mass and the ocean quite literally guarantees off shore and near shore wind capacity. Reality is probably on the order of 10% of that number, which is roughly one used mid-sized Tesla P65 battery or at most 25%.
How would you power a 2 ton mini split ccASHP to heat a 60,000 BTU/H house when it is -6F outside, you need about 3 of them if not more, going through the defrost cycle, running at a COP of 1, that is about 17.5 KW per hour, that is about 32 hour cold span, only for heating, no other energy use in the house, if done with ASHPs. No electric car charging, no hot water production, no TV, no internet accounted for. 561 kw/h. Show me the math how you do this with 10% of the storage. No solar PV power. How would you even heat the house through the night? When the wind happens not to blow either, which I assure you happens….
Posted By Dana1 on 06 Jul 2017 09:15 PM
The cost of upgrading the grid to handle the capacity of charging all EVs overnight at the same time (even without the heat pump loads) would be gia-normous, and you can pretty much bet the planners have this already figured out in better than just a crayon-on-napkin math.
This is actually the quintessence of the issue. ASHPs during peak demand wil use more than electric car charging, but will run the whole night, and during peak nights, they will run all full out the whole night long. Indeed giga-normous.