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Ductless Heat Pumps (DHP) in Single Family Homes with Zonal Electric Heat Proven UES Measure Proposal Regional Technical Forum October 16, 2013
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Presentation Outline Measure Overview Staff Highlighted Areas Presentation of Measure Documents – UES Analysis and Results RTF Staff Recommendations Proposed Decision 2
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Measure Overview Review the Measure Properties section on the “Summary” tab of the proposed measure workbook.proposed measure workbook – Measure Specifications 3 Measure DevelopersNorthwest Energy Efficiency Alliance (NEEA) with Ecotope, Inc. Technical Subcommittee ReviewNo Research & Evaluation Core Group Review No NotesA provisional measure for DHPs in zonal electrically heated homes is scheduled to expire December 31, 2013.
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Staff Highlighted Areas DHP Calibration – Double-check – Step-by-step: from DHP metering study savings results to UES estimate – Revisit DHP performance curves, especially areas requiring judgment Measure Screening – Measure Definitions for screening – Matching the screening measure definitions to the billing study data Revised Costs (minor changes, but worth mentioning) – Cost data filtered for 9.5 HSPF requirement – AC credit now uses Council’s forecast of AC saturation Estimated Baseline Cooling Consumption – Does the RTF agree with the simplified approach being used? Last Measure In Approach – Does it look reasonable? – Note: The sunset for this measure is proposed as “5 years, or 2 months after RTF decision on LMI, or 2 months after RTF decision on the value of wood smoke, whichever comes first.” This allows the RTF to avoid high-centering DHP because of these big issues with unknown timelines. 4
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Measure UES Analysis and Results Energy Use and Savings Estimation Method – Heating No supplemental fuel. Supplemental fuel. Unscreened for fuel. SEEM: DHP Performance Curves Simulation Input Parameters (house insulation levels) – Cooling Savings – Comparison to field study findings Costs Benefit/Cost Screening Approach 5
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Energy Savings Estimation Method, Parameters and Data Sources* Heating Savings Estimation Method – Homes that pass screen: no supplemental fuel found Modeled estimates (SEEM) DHP performance curves (See “dhp_perf_models” tab) Parameters (used for all screening options) – Insulation levels (See “Rval_fcst” tab) – Homes that fail screen: supplemental fuel found How much supplemental fuel is use Pre- and Post- DHP? – See top of ‘SavingsData&Analysis” tab – Unscreened homes: average of the two screened cases Average savings using supplemental fuel ratios from RBSA Cooling Savings Estimation Method *See “Summary” tab of the proposed measure workbook for details.proposed measure workbook 6
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Savings kWh/yr savings for 27 measure applications defined by 3 heating zones, 3 cooling zones, and 3 screen types (See “Presentation” tab.) Step-by-step: from DHP metering study savings results to UES estimate (See next slide) 7
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Costs, NEBs, and B/C Results Costs – DHP capital costs by heating zone – Cooling capital cost offset by cooling zone – See “Presentation” tab Non-energy benefits – Supplemental fuel by heating zone – Cooling by cooling zone – See “Presentation” tab TRC B/C results for 27 measure applications defined by 3 heating zones, 3 cooling zones, and 3 screen types (See “Presentation” tab.) 9
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Screening Houses for Supplemental Fuel Use* Background Required information Methods and screening criteria *See “screen_criteria” tab. 10
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RTF Staff Recommendations RTF staff recommends the RTF approve the DHP measure as proposed, if the following additions or modifications are made: – Provide additional documentation on the derivation of heat pump performance curves and other data in the UES workbook which cannot be easily accessed in a report; and – Calculate wood offsets for those houses not matching the supplemental fuel screen (see the “Match Rate” table on the screen_criteria tab of the workbook). 11
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Proposed Decision “I _________ move that the RTF approve the Ductless Heat Pumps UES measure for Zonal Electrically Heated Single Family Homes as a Proven UES measure with Active status.” 12
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