Murrieta Public Library

CIC Boost was applied to the HVAC ducting Reduce Solar Heat Loading, Seal Duct Joints and Eliminate Rust and Corrosion
Download PDF Description of the Project
This application of CIC Boost increased the energy efficiency of the ducting and qualified for a rebate under SCE Solution AC-40390 within the Customized Solutions program. The CIC Boost extended the useful life of the ducting by twenty years eliminating the need for the city to replace the ducting.
Reduce Heat Load caused by Radiation

Seal joints that are cracked and rusted
The duct sealant at the joints has failed and there is rust under the sealant that indicates condensation.

Monitoring the project:
The HVAC system for the Murrieta Library is located on the roof top and is subject to full sun and solar heat loading. The image below is a simplified illustration of the roof top system that is being tested. Remote temperature sensors were located at the following locations:
Two Days were selected for comparison, May 23, 2017, which was the hottest day before the coating was applied and June 15, 2017 after the coating was applied. These days were selected because they both had a high temperature of 93.2°F according to wunderground.com
These graphs demonstrate that the coating reduced the surface temperature of the ducting up to 25°F and reduced the heat loss within the ducting by up to 4°F. Additionally, there is a motion sensor that shows that the HVAC unit is cycling on and off after the coating was installed where before the coating was installed the unit came on in the morning and ran all day.
ASHRAE cited that for each 1°F the thermostat was raised provided a 3-6% savings in electric cost. The library is not changing the thermostat setting but by greatly reducing heat loading on the ducting the HVAC system runs less to provide the same amount of cooling thus lowering electric costs. We are predicting that a 4°F reduction in temperature will reduce the use of energy by up to 24%.
Before and After Images
The following temperature measurements with recorded with a FLIR TG154 and a location and an image of where the temperature reading was taken for reference
- Before Images were taken on 6/3/2017 9:30 AM with an ambient temperature of 77°F
- After images were taken on 6/30/2017 10:30 AM with an ambient temperature of 75°F
The following images were taken before and after coating at the south end of the ducting where the AC enters the building, this temperature reading is at the joint.
These images are of the also at the south end of the ducting in the shade of the roof overhang. FLIR images are measuring the ducting. The measurement taken before the coating was applied is lower because cold air was conducting out of the duct.
These images were taken on the side of the long ducting run.
From these image taken of the long run showing the joints before and the sealed joints after
This measurement was taken on the duct joint, showing temperature of the joint.
Click on the image below to view a short video of the application.