[BLDG-SIM] passive solar, round 2: Energy-10

[JRR]

E-10 V1.6 does not model night insulation for windows or Trombe wall 
derived elements.
This feature has been promised for  E-10 V2.0 which is due out soon.....
Take 24 hr average insulation value for windows on a 12 hr / 12 hr basis 
for annual runs,
then go back and run Dec-Jan only with 9 hrs daylight 15 hrs night for 
avg. window insulation.

Three loops of PEX tubing set in the slab, in the middle of the rock 
storage, and at the bottom of the rock storage
will beat active air recirculation.
JRR.

Lee Elson wrote:

> In an earlier email, I wrote:
>
> I'm designing a 3500 sq foot residence at a 5000' desert-like 
> elevation (Nevada).
> The site has good sun exposure and the climate is generally dry. Typical
> temperatures in Feb are 20-40 F. The building is mostly oriented 
> east-west and has
> a 2' deep insulated rock floor (for thermal mass) with active air 
> recirculation.
> ICF's will be used as well as tile over concrete (above rock floor) in 
> south
> facing rooms.
>
> I received many very useful responses regarding how to simulate this 
> building. As a result, I've acquired and tried to master Energy-10 (I 
> was using eQuest, but that's another story). I've done 2 simulations 
> of the building where the only difference is that I use either clear 
> double glazing or double low-e glazing *on the south side*. All other 
> sides use double low-e glazing. The reason for doing this is that many 
> sources strongly suggest that using low-e glass on the south side will 
> inhibit much of the solar gain. The results show that the low-e case 
> requires about 1/2 the heating as the clear case. Thinking that this 
> might be due to thermal mass, I increased the thermal mass and that 
> helped reduce the heating needs of the clear case by about 15%.
>
> My thinking is that for the clear glass case, I'm loosing more heat 
> when there is no sun than I'm gaining when there is sun, relative to 
> the low-e case. In reality, this can be helped by covering the windows 
> when there is no sun, but I don't know how to simulate this in 
> Energy-10. Is there a way to change the U-value at night?
>
> Any suggestions?
>
> Lee Elson
>
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