In 2007/2008 Phase Change Energy Solutions partnered with the Arizona Public Service (APS) to create an experimental setup to test the performance of our ENRG Blanket product. This experiment did not have internal gains from lights/people/equipment so was effectively an envelope only test.
For envelope loads only the results of a maximum energy savings of about 30%, a maximum peak load shift of ~ 60 min, and maximum cost savings of about 30% are quite impressive. Note: Actual buildings with internal loads may experience larger benefits.
The study focused on the kWh usage, HVAC run-time and attic temperatures between the dates of 12/14/2007 and 1/24/08 due to the average temperatures for the Phoenix Arizona climate. During this period the control building consumed 240 kWh and the BioPCMTM Building consumed 177 kWh Savings, a 26% reduction. Publications of this experimental setup can be downloaded from these links:
The primary objective of the experiment was to monitor temperature changes within the walls of the buildings and to observe HVAC system cycles. Thermocouples installed into the outlet ducts of the HVAC system are used to record these system cycles. Observations show a dramatically lower HVAC cycle rate within the BioPCMTM building than the control building.
In some cases, the structure maintained at the desired temperature range for periods as long as 11 hours without input from the HVAC system. Below is an example of systems cycles on Dec, 17, 2007 (an average day).
The attic temperatures of the two structures where also dramatically different. Attic temperature of the control building tended to fluctuate around a mean of 100 degrees Fahrenheit. The behavior of the PCM attic has followed much closer to ambient temperatures. Below is the attic temperature data for Dec, 17, 2008 (an average day).
Key figures from the one year test are listed in the table below.