premium rooftop unit (rtu) retrofit overview
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Premium Rooftop Unit (RTU) Retrofit Overview
August 20, 2012
RTF RTU Working Group
Mira Vowles, BPA
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Emerging Technology (ET) Field Tests
First Two ET Field Tests Premium RTU Retrofit VRF Systems
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Example: Heat Pump Water Heaters
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2008Product Launched
2009Convene advisory
committee 2009Northern Tier Specification
2010-11Lab tests (NREL)
2010-12Field tests (EPRI)
2011Estimated energy savings
potential assessment
2012Program deployment
BPA & NEEANEEA emerging tech
BPA E3T, EPRI
BPA E3T, NREL
BPA emerging tech
BPA planning
BPA programs
ET Field Test Web PageDynamic list of new field tests
Eligibility requirements number of installations Pre-defined savings and
BPA provided M&V
Utility participation request link Technology briefs Marketing materials
“Go Field Test” www.bpa.gov/go/FieldTest
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Premium Rooftop Unit (RTU) Retrofits
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Premium RTU = RCx + Retrofit + Replacement
Premium RTU Retrofits –What?
Premium RTU Retrofits –What?
1. Supply Fan Control Savings– Cycling– Multi-speed– VSD
2. Demand Controlled Ventilation
3. Premium economizer control
Approved products: Transformative Wave Technology’s Catalyst, Honeywell JADE controller with DCV, VSD and speed controller, KMC FlexStat other products as approved
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Premium RTU Retrofit Details
Unitary, single-zone RTU with an economizer greater than five tons of cooling capacity and serving a commercial facility in BPA territory
BPA ET Field Test Limited to 75
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Premium RTU Retrofit Pre-defined Savings
Occupied hours per
yearSavings
(kWh/ton)Incentive
($/ton)2,000 - 4,000 600 $1204,001 - 8,760 1,000 $200
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Good Premium RTU Retrofit Applications (not required)
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Long hours of occupancy, High occupant density (# of people/SF), Varying levels of occupancy, High cooling loads, Electric heat and No energy management system Applications: big-box retail, small-box retail, offices,
grocery stores, gyms, fitness centers, places of assembly, auto dealerships, theaters, schools, casinos, bowling alleys and restaurants
Premium RTU Retrofit Research ?’s
1. What is the simplest, reliable method to quantify Premium RTU Retrofit savings?
2. Can the updated ECAM be used as the standard RTU protocol for Program evaluation?
– What are the data requirements?
3. Are there other key variables affecting savings, besides OSA temperature and hours of occupancy?
4. Other?
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Premium RTU Retrofit Research Plan• Use the updated ECAM as a Provisional Standard
Protocol calculator on up to 125 RTUs
• Research data requirements:
i. True power, OSA temperature, plus other variables TBD
ii. One year of weekly cycling, or 6 months of pre & post data
» Recommend best practice for metering period
iii. One minute interval
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Premium RTU Retrofit Research PlanPotential RTUG interim presentation – fall/winter?
– PNNL, DOE funded, Catalyst work
» 49 RTUs in PNW
» up to 16 heat pumps
– BPA ET Field Test status and analysis
» up to 75 RTUs
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Updated ECAM Premium RTU Retrofit Demonstration
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