evergreenecon.com heat pump water heater model validation, market progress assessment, and process...
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EvergreenEcon.com
Heat Pump Water Heater Model Validation, Market Progress Assessment, and Process Evaluation
RTF HPWH Sub-Committee MeetingOctober 15, 2012
Topics
• Quick Review of Study Goals
• Metering Site Selection
• Site Recruiting Process & Status
• Metering Protocols
• Process & Market Evaluation Updates
• Schedule Update
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Goal Review
• For active UES, need more information in 3 Primary Data Collection Areas:
• Hot water consumption
• In-field COP
• Space Conditioning Interaction
• Quick Review of Study Goals
• Metering Site Selection
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Metered Hot Water Consumption
• Metered DHW Energy Use Only (no flow):
• DHP Field Studies (all electric tanks) • NEEA: 95 sites• BPA: 50 sites
• RBSA Metering (gas and electric tanks):• 100 sites
• Total # Sites with Metered Energy Use: 245
• Metered DHW Energy and Hot Water Use:
• BPA/EPRI: 32 HPWH Sites + ~10 Traditional Tank Sites• NEEA/Fluid: 30 HPWH Sites• NEEA/RTF: 50 sites• Total # Sites; Metered Energy and Flow: 120
• National Studies:
• LBL Database
• Assume hot water use across all tank water heater types is similar
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Measurements: In-Field COP
• Data Collected
• Continuous monitoring; one minute intervals
• Hot water consumption (gallons)• HPWH energy consumption
• Compressor and electric resistance element run time extracted in data processing
• ΔT of water delivered• Ambient temperature• Inlet and Exhaust air temperature
• Two-Time Measurements
• For ducted units (assumes constant speed fan)• Airflow
• Sample
• 100+ Sites from 3 studies across the region
• Site selection determined by need to quantify independent performance variables
• Proposed selection in subsequent slides
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Measurements: Space Conditioning Interaction
• Interaction primarily determined through simulation using measurements as simulation constraints
• Data collected:
• Continuous monitoring; one minute intervals
• House heating energy use• Outside temperature• (Optionally, monthly billing data may produce a heating estimate)
• One-time measurements:
• House Audit, including• Unheated Buffer Space-to-House UA• Unheated Buffer Space estimate of internal gains (equipment audit)
• Sample
• 100+ Sites from 3 studies across the region
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HPWH Savings Estimate
• Build calibrated & validated models of HPWH performance
• Overlay simulation estimates on regional maps of natural (or potential) HPWH distribution
• Validating the model requires measurement of independent performance variables across:
• Heating climate zones,
• Installation locations, and
• Tank sizes
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Site Selection Drivers
• Quantify independent performance variables
• Environmental: Pre-determined by climate HPWH installation location. Primary drivers for our site selection categories.
• Ambient conditions of HPWH installation space• Cold water inlet temperature
• User: Secondary drivers for site selection – diverse user base & long metering period will likely provide needed variation
• Draw pattern, • Tank temperature setpoint, • Control strategy selection
• Equipment: Previously measured in lab so not a metering driver (but can also be confirmed in the field)
• Tank volume & heat loss rate• Heating component output capacity & efficiency• Control strategies
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Site Selection
• Memo from August 30, 2012Combined Current Studies Total Sites: 54
Tier 1 Tier 2Small Size < 55 gallons Large Size > 55 gallons Any SizeHZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3
Garage 14 0 0 3 0 0 8 4 0Unheated Basement 2 1 0 0 0 0 3 0 0Interior 2 0 2 0 0 0 -- -- --Interior Ducted -- -- -- -- -- -- 9 6 0
Planned New Installs Total Sites: 50
Tier 1 Tier 2Small Size < 55 gallons Large Size > 55 gallons Any SizeHZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3
Garage 2 1 5 0.5 0.5 0 0.5 0.5Unheated Basement 3 2 1 3 0.5 0.5 0 1 1Interior 4 2 0 4 2 0 -- -- --Interior Ducted -- -- -- -- -- -- 4 6 6
Final Disposition Total Sites: 104
Tier 1 Tier 2Small Size < 55 gallons Large Size > 55 gallons Any SizeHZ1 HZ2 HZ3 HZ1 HZ2 HZ3 HZ1 HZ2 HZ3
Garage 14 2 1 8 0.5 0.5 8 4.5 0.5Unheated Basement 5 3 1 3 0.5 0.5 3 1 1Interior 6 2 2 4 2 0 -- -- --
Interior Ducted -- -- -- -- -- -- 13 12 99
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Site Recruiting: Process & Status
• Status
• Calling began last week• Some pre-qualification visits already scheduled
Sorted / Screened Call List
Recruiter Calls to Determine Eligibility
Recruiter Schedules Pre-Qualification Inspection Visit
Field Tech Conducts Qualification
Inspection Visit
Ecotope & Field Tech Determine
Final Qualification
Recruiter notifies site of ineligibility
Recruiter Schedules HPWH & Meter
Installation Visit
yes
no
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Metering Protocols
• Draft Protocol Memo from October 3, 2012
• Refer to Memo
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Test Metering Site Successful
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Process & Market Evaluation Updates
• Interview and Survey Guide Development
• Currently developing in-depth interview guides for:
• NEEA & Fluid Staff• Manufacturers, Distributors, Retailers• Installers (e.g., plumbers, contractors)• Partner Utility Staff
• Currently developing CATI survey guides for 100 homes:
• Homeowners with HPWHs installed through the market• Homeowners with HPWHs installed through our validation work• Survey disposition will be driven by market success
• Priority is surveying households who installed HPWHs through the market
• All interviews and surveys will occur in 2013, other than for NEEA staff
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Schedule Update
• Field Work
• Site recruiting October-November 2012
• Metering installs November-December 2012
• Metering period through June 30, 2012
• Process & Market
• NEEA staff interviews early November, 2012
• All other interviews and surveys in January-February, 2013
Questions?
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