PGE Wireless Pneumatic Thermostat ET Final Report.pdf
PGE Wireless Pneumatic Thermostat ET Final Report.pdf
PGE Wireless Pneumatic Thermostat ET Final Report.pdf
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PG&E’s Emerging Technologies Program <strong>ET</strong>11<strong>PGE</strong>3171<br />
Figure 19: Pilot Site 2 - Boiler Reset Schedule Based on OA<br />
We can see in this figure that the hot water setpoint is reset between 120°F and 150°F<br />
based on the outside air temperature varying between 50°F and 58°F.<br />
Energy Savings Calculations:<br />
We can clearly see the effect of the reduced pre-heat temperature in the trending data.<br />
SAT (°F)<br />
80<br />
70<br />
60<br />
50<br />
Pilot Site 2 - Supply Air Temperature<br />
40<br />
30 40 50 60<br />
OAT<br />
70 80 90<br />
Figure 20: Pilot Site 2 - Baseline and Post-Retrofit SAT<br />
The figure above clearly shows the high SAT during low outdoor air temperatures in the<br />
baseline pre-retrofit case. In the post-retrofit case, this data cluster is not apparent.<br />
Both these measures should result in some gas savings. We calculated gas savings using a<br />
utility billing regression model to correlate heating degree days, cooling degree days, and<br />
monthly gas usage, see table below.<br />
38<br />
Baseline SAT<br />
Post-WPT SAT
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