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[EnergyPlus_Support] Glazing Construction
I used E+1.0.1 to test several glazings and compared
the glass inside temperature with Windows5. E+'s
results are 3-5 degree C higher than those of
Windows5.
There are my assumptions:
Outside Temp: 32C Air Speed: 3.5m/s
Inside Temp: 23C Air Speed: 0.1m/s
Simulation Date: Jul, 21.
Weather Data : Chicago (This seems not matter.)
Temp setup in Windows5: outside 32C and inside 24C.
I campared the max inside surface temp of each glazing
system to that of Windows5, and the max surface temp
always happens in the afternoon of the west window.
In general, single-pane clear glazing, double clear,
double bronze have a inside surface temp difference
about 3C, high-transmission low-E and
selective-transmission low-E have a difference about
5C. Since I am considering the comfort of a person
sitting near the glazings, the glass temp is very
important to me.
I suspect there are several reasons:
1. The accumulating effect in E+.
2. Sun angle. (However, this should results in a
decrease in E+.)
3. Reflection of short-wave radiation from inside or
outside.
How's your ideas? (The IDF files are attached.)
Hannah
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