UC Berkeley Regatta Museum Collections Facility (Phase 2)
Richmond, CA, USA
21,000 ft2 (Phase 2)
Careful climate control during commissioning and for treasures in art collection facility
Intelligent Equipment® control on two
10-ton Daikin Rebel® rooftop units
Daikin Fan Coils Pass the Test for University Seeking LEED Silver NC Certification
Protecting treasured artwork and artifacts demands tight tolerances for humidity and temperature control. Stringent standards for climate control were required during a major renovation of warehouse space for the Regatta Museum Collections by UC Berkeley. Tolerances were set at 68 degrees F, within +/- 2 degrees and 50 percent relative humidity (RH), +/- 5 percent.
The 121,000 ft2 facility contains thousands of historic artifacts that require an HVAC conditioned environment to preserve the integrity of the collection.
Totaling 121,000 ft2, the Regatta art warehouse in Richmond, CA spans across multiple storage facilities and accommodates UC Berkeley’s campus-wide art collections and other related materials. A chilled-water desiccant-based system was used in the Phase 1 renovation, which began in 2010 on the largest section of the space, 100,000 ft2. Under Phase 2 of the project, in 2014, UC Berkeley requested bids on a system upgrade to the remaining 21,000 ft2 space to include new mechanical, electrical, and plumbing systems.
Two 10-ton Daikin Rebel commercial rooftop systems were specified for Phase 2 with a standard at 500 cfm of peak design dehumidification conditions, with 90 percent of the load as outside air.
“The variable speed compressors on the Rebel units have the capability to provide temperature and humidity control at significantly less cost than the installed price of an air-cooled chiller desiccant system with storage tank,” said Daikin representative Steve Dobberstein, senior sales engineer with Norman S. Wright Mechanical Equipment Co. in Brisbane, CA.
Two 10-ton Rebel rooftop systems with variable speed compressors and EC fan motors were specified for Phase 2 of the Regatta project.
Each Rebel rooftop unit is connected to Daikin’s Intelligent Equipment to provide the facility management team with unprecedented visibility into unit performance and control to monitor and manage the system to the tightest tolerances. Intelligent Equipment was also used to calibrate the rooftop equipment during the commissioning process. “The customer trusted the idea of using the Rebel rooftops and Intelligent Equipment in this climate-control application.
The fact that a Daikin applications engineer half-way across the country can be virtually hands-on with Intelligent Equipment allowed us to sell the job,” Dobberstein said, noting the Rebel units were installed in February 2015 and the start-up process began in summer.
Right: Intelligent Equipment allows 24/7 remote monitoring from anywhere via a laptop, mobile phone, or tablet.
Below: Daikin Intelligent Equipment provided real-time, remote access to diagnostic points that the facility’s building automation system (BAS) could not provide.
“Intelligent Equipment provides a window into trending information on base temperature and humidity, and other control points such as compressor speed, fan speed, and unit state, giving engineers the ability to adjust the settings and troubleshoot,” said Matt Dodds, Daikin application engineer for commercial rooftop units. “On a remote basis, you can go into the data for a deeper level of insight than you would by talking to a service technician standing by a unit on the roof.”
Authorized parties access Intelligent Equipment for rooftop performance and operating conditions on either a highly secure Ethernet LAN connection, or a 3G-high security cellular network that connects directly to the cloud, which prevents unauthorized users from compromising the system or accessing
“Intelligent Equipment gave access to diagnostic points unobtainable from the facility’s building automation system (BAS). Intelligent Equipment is also a helpful application because of the high cost of technician services,” Dobberstein said, noting the platform’s remote troubleshooting capability eliminated several service calls (truck rolls) during commissioning.
The bottom line: Daikin’s Intelligent Equipment saved time and money during the six-week-long start-up and commissioning process of a critical-control application where packaged rooftop units are seldom used. “With some fine tuning only possible with Intelligent Equipment, Daikin was able to optimize the control of the Rebel units to meet the required tolerances of +/- 2 degrees and +/- 5 percent RH,” Dodds said.