On Thu, 26 Oct 2017 00:27:36 +0100, "James Wilkinson Sword"
wrote:

On Wed, 25 Oct 2017 23:09:18 +0100, wrote:

On Wed, 25 Oct 2017 22:52:08 +0100, "James Wilkinson Sword"
wrote:

On Wed, 25 Oct 2017 22:09:10 +0100, dpb wrote:

On 25-Oct-17 3:27 PM, James Wilkinson Sword wrote:
On Wed, 25 Oct 2017 21:16:41 +0100, dpb wrote:

On 25-Oct-17 2:58 PM, James Wilkinson Sword wrote:
...

There would be no heat let in as the IR would be turned into
electricity.

Only if the conversion were 100% effective...

Whatever the %, you're just changing one gain for another. Unless of
course your house is too warm.

Well, of course, but the PV conversion will be yet another net loss if
actually do need the heat as its conversion is not reversible and
certainly the usage isn't altho if went into resistance heating the loss
wouldn't be huge...

The question would be whether there really were sufficient PV generation
to actually be a noticeable fraction of other usage that could be
replaced. One would kinda' doubt it just from the geometry and all, but
I've not tried to do any sort of guesstimate given there's absolutely no
data with the blurb to even try to estimate what the incident energy
intensity might be in the portions of the spectrum targeted.

If your heating is on, solar windows are useless, you might aswell let the infra red through. They only help during weather where you aren't heating your house. Then they would both remove unwanted IR, and create energy to run the AC. So it depends on the climate really.

They still let in more heat than the power generated would pump out if
you in a place where the sun actually shines.

No idea what your point is. There is x amount of energy going through the window already. If you want that as heat, there is absolutely no point in intercepting it for electricity, as you will no longer get that heat.

That assumes that the IR energy is what gets converted to electricity.
It is actually the visible light. Even if it was converting IR, the
best cells are still only around 30% efficient allowing 70% through.