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bernard · 11-22-15, 04:20 AM

Hi Jeff,

I agree with the truck comparison.
However, my initial question was not related with a specific project, neither I plan to install the swh system.
I just wanted to know in general, how much thermal energy could a swh system of a certain size, and specifications generate at specific location. That is all.

I've made testing on a couple of examples of residential objects (ground story only, up to ground story plus first, second story).
If height of the story was not more than 3 meters, I've found that an initial assumption of 5 meters per story (for supply) and 5 meters for return, got me in a ball park.
Of course it overestimated the length, when collectors were located exactly above the storage tank.
And it also underestimated the length when collectors and storage tank were located at different corners of the house.
I did not make any testing for the drainback systems, only pressurized ones.

But all in all, it gave me a pretty decent assumption, which I am using as an input for NREL SAM solar water heating application and its input: "total piping run".

11-22-15, 04:20 AM	#22
bernard Lurking Renovator Join Date: Sep 2015 Location: Hungary Posts: 22 Thanks: 9 Thanked 0 Times in 0 Posts	Hi Jeff, I agree with the truck comparison. However, my initial question was not related with a specific project, neither I plan to install the swh system. I just wanted to know in general, how much thermal energy could a swh system of a certain size, and specifications generate at specific location. That is all. I've made testing on a couple of examples of residential objects (ground story only, up to ground story plus first, second story). If height of the story was not more than 3 meters, I've found that an initial assumption of 5 meters per story (for supply) and 5 meters for return, got me in a ball park. Of course it overestimated the length, when collectors were located exactly above the storage tank. And it also underestimated the length when collectors and storage tank were located at different corners of the house. I did not make any testing for the drainback systems, only pressurized ones. But all in all, it gave me a pretty decent assumption, which I am using as an input for NREL SAM solar water heating application and its input: "total piping run".