The installation of Infinite-R™ over ceiling tiles at the school resulted in a 29% reduction in propane use for heating savings in the first year of operation. This was however WITHOUT making any controls changes to specifically optimize for the PCM.
In the heating season, the first year of operation showed a calculated 29% reduction in propane use in the modular classroom addition (all on one propane service). This savings was calculated using heating degree hour comparisons and trend analysis. HOWEVER – this savings did not include any changes or optimization in controls for the PCM.
In January 2017, internet accessible controls were installed in the Non PCM & the PCM classrooms being monitored. Temperatures for heat set point were set at 72ºF during occupied time and setbacks were set at 62F on weekdays, with weekend setbacks of 62F. Temperature control was limited to (+/-) 1ºF.
Run time of HVAC fan for heating was monitored during a 30 day period and an astounding 56% reduction in fan use was measured!
Here are some snapshots that show the exact same time periods comparing the CONTROL vs INFINITE-R™ classroom.
(NOTE: To visually see differences in fan run time, compare the RED lines at bottom of each graph which denote frequency of fan operation)
In December 2015 a total of 11,000sf of Infinite-R™ was installed in one wing of the middle school over existing suspended ceiling tiles. The results have been very interesting to date.
- Melting PCM in winter above ceiling from heat loss in un-insulated ductwork
- Sustaining temperatures overnight with no heat use (never really dropping below 67ºF), and often sustaining above 65ºF (setback temp) from Friday afternoon all the way to Sunday afternoon on weekends!
- Absorbs heat during hot days to mitigate use of air conditioning in areas with A/C installed.
- More than 50% reduction in temperature swing when comparing two modular classrooms with vs without PCM!
Location: Newton, NH
Install Date: 2015
Quantity of PCM: 11,000sf
Estimated Savings: 20% – 30%
Investment Return: 5 yrs (Heat only) 3 to 4 Yrs (Cooling included)