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Heat Pump Water Heater Model Validation, Market Progress Assessment, and Process Evaluation

This article delves into the progress assessment and process evaluation of heat pump water heaters, focusing on study goals, metering site selection, and market updates for active UES. It highlights the importance of data collection in areas such as hot water consumption and in-field COP. The study aims to validate models of HPWH performance and assess energy savings. Site selection drivers, metering protocols, and interview guides development are also discussed.

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Heat Pump Water Heater Model Validation, Market Progress Assessment, and Process Evaluation

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  1. Heat Pump Water Heater Model Validation, Market Progress Assessment, and Process Evaluation RTF HPWH Sub-Committee Meeting October 15, 2012

  2. Topics • Quick Review of Study Goals • Metering Site Selection • Site Recruiting Process & Status • Metering Protocols • Process & Market Evaluation Updates • Schedule Update

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. Site Selection • Memo from August 30, 2012

  10. Site Recruiting: Process & Status Sorted / Screened Call List Recruiter Calls to Determine Eligibility Recruiter Schedules Pre-Qualification Inspection Visit Field Tech Conducts Qualification Inspection Visit Recruiter Schedules HPWH & Meter Installation Visit Ecotope & Field Tech Determine Final Qualification yes no Recruiter notifies site of ineligibility • Status • Calling began last week • Some pre-qualification visits already scheduled

  11. Metering Protocols • Draft Protocol Memo from October 3, 2012 • Refer to Memo

  12. Test Metering Site Successful

  13. 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

  14. 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

  15. Questions?

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