Phase Change Energy Solutions Inc. has an ongoing longevity research program in place to test the longevity and durability of our products. Many phase change materials, particularly the inorganic varieties, are prone to deterioration over time. As the materials go through freeze-thaw cycles the materials break down gradually reducing the amount of latent heat storage per transition. Organic phase change materials such as Phase Change Energy Solutions’ BioPCMTM have been shown to be very resistant to this deterioration. These ongoing tests are undertaken to ensure the reliability and the durability of our extruded multi-layer copolymer film macro-encapsulation of our bio based Phase Change Material “BioPCMTM” emulsified with a proprietary fire retardant blend to make our “ENRG Blanket” product line.
Below are some highlights of the results from several experiments being conducted at our Asheboro NC location.
Environmental Test Chamber BioPCMTM Cycle Test:
Test Setup: BioPCMTM cycle testing was performed in a Standard Environmental Systems Model 10C Environmental chamber equipped with a Honeywell DR4200 Paper charter. This chamber is programmed to perform the following cycle:
- Begin at 20°C
- Ramp to -20°C 5 minutes
- Hold -20°C 20 minutes
- Ramp to 60°C 10 minutes
- Hold 60°C 20 minutes
- Ramp to 20°C 5 minutes
The above defined cycle allows for one full solid to liquid cycle for our samples each hour. We are using 270 cycles to represent one year’s worth of cycles in the field. This is in line with DOE U.S. Department of Energy standards. Periodically, and at the end of the experiment, samples where tested using a differential scanning calorimeter in order to determine if the material thermal energy storage capacity had degraded over time-heat/cool cycles.
Observations: BioPCMTM Q23- 23,563 Cycles- 87.2 years
Sample was enclosed within PCES proprietary multilayer polyfilm (ENRG Blanket) throughout duration of cycle tests to determine whether the polyfilm would interact with the BioPCMTM. The sample shows little to no breakdown over duration of 87.2 years cycling test. We infer from these results that BioPCMTM will perform well on an ongoing basis and should outlive the buildings it is installed within.
ENRG Blanket film seal and structure tests:
Grieve Laboratory Oven Heat Test:
BioPCMTM samples were place into the lab oven. The temperature was set at 185ºF on a 24/7 continuous basis for 49 days. The ENRG Blanket cells where intact at the end of the 49 days and the BioPCMTM was still able to fully solidify/freeze.
A pressure test was performed on a sample that was in the Grieve Oven after 49 days. It required 559 psi to rupture cell cavity on the surface of the cell pocket (it did not rupture at the weld). This pressure test demonstrates an exceptional film and seal quality at these extremes.
Lindberg Box Furnace Test:
Samples were place into a lab oven. The temperature was set at 160° Celsius (320°F) and ran for one hour to test the extreme temperature. The overall sample had a slight reduction in size; however, no deterioration of the seal area was found.