Advanced RTU Controls Opening up a New Retrofit Market
About Energy 350 ➢ 26 person firm based in Portland ➢ EE Program Deployment & Support ➢ Building Tuning/RCx/SEM ➢ Energy Studies ➢ Research ➢ Evaluation ➢ LEED/Green Building Assistance 2
Traditional Small Commercial • On-site consultations would recommend the usual: 3 12/17/2018
Traditional Small Commercial • On-site consultations would recommend the usual: 4 12/17/2018
Traditional Small Commercial • On-site consultations would recommend the usual: 5 12/17/2018
Traditional Small Commercial • On-site consultations would recommend the usual: 6 12/17/2018
Traditional Small Commercial • On-site consultations would recommend the usual: 7 12/17/2018
The RTU Market is LARGE 66% of Buildings served by RTUs* *2012 CBECS Inventory
The RTU Market is LARGE and, Energy Intensive! 66% of Buildings served by RTUs* HVAC represented 44% of end use BTUs in CBECS 2012 data *2012 CBECS Inventory
Just how big is this market? PNNL estimated that if half of the existing RTU stock were retrofit, 10,000 aMW would be conserved.
What is an ARC? ➢ Converts from constant volume to variable volume air supply (supply fan VFD) ➢ Optimizes free cooling/economizer control ➢ Optimizes Scheduling ➢ Demand Controlled Ventilation (DCV) 11 12/17/2018
ARC Optional Add-Ons ➢ Web accessible controls ➢ Fault detection analytics ➢ Automated Demand Response 12 12/17/2018
Advanced Rooftop Controls • Where have ARCs taken off? – Retail, Manufacturing, Restaurants • What are the barriers to implementation? – Out of sight, lack of awareness of the technology – Split incentive • Where should we never install an ARC? – Systems with a high thermal load-capacity ratio 13 12/17/2018
Control Details 14 12/17/2018
Ventilation 15 12/17/2018
The results…a BIG deal 90% Savings Distribution 80% % Energy Savings 10 70% 9 60% 8 50% 7 40% Frequency 6 30% 5 20% 4 Frequency 10% 3 0% 2 2,500 3,500 4,500 5,500 6,500 7,500 8,500 1 Annual Runtime 0 20% 30% 40% 50% 60% 70% 80% 90% % Savings Median savings 57% 16 12/17/2018
The Economics Simple Payback vs Operating Hours by building 14 90 80 12 70 Simple Payback (yrs) 10 60 RTU Count 8 50 40 6 30 4 20 2 10 0 0 3,261 3,640 5,110 5,543 7,636 8,292 8,760 8,760 8,760 8,760 8,760 Average Hours of Operation Simple Payback unit count Before incentives @ $0.072/kWh, only electric (kWh) savings included 17 12/17/2018
18 12/17/2018
Non-Energy Benefits “…these controls took us from a reactive to a proactive mode . Before, we typically didn’t know there was a problem with a unit until we received employee complaints. Now, facilities personnel often identify issues and resolve them before occupants arrive…” Scott Bacon, Leatherman Tool Group, Portland 19 12/17/2018
The Challenges Ahead • These retrofits are not going to happen on their own • ARC upgrades can’t be observed in the space (it’s not lighting or appliances • We must actively seek allies in the market to develop traction 20 12/17/2018
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