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Deeming Savings for Ductless Heat Pumps in Manufactured Homes

Deeming Savings for Ductless Heat Pumps in Manufactured Homes. Regional Technical Forum January 4 th , 2011. Background: RTF History for DHP’s. Single Family Homes = 3,500 kWh/year With Zonal Electric Heat – November 2007 Justification:

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Deeming Savings for Ductless Heat Pumps in Manufactured Homes

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  1. Deeming Savings for Ductless Heat Pumps in Manufactured Homes Regional Technical Forum January 4th, 2011

  2. Background: RTF History for DHP’s • Single Family Homes = 3,500 kWh/year • With Zonal Electric Heat – November 2007 • Justification: • The main living area consumes the majority of the heating energy, so installing a DHP there could offset a significant amount of heating energy use in these houses. • Occupants still have the same zonal control they’re used to. • 3,500 kWh/year seemed reasonable given the heating loads; it was also the lowest value that still resulted in a cost-effective measure. • With Forced Air Furnaces – September 2008 • Justification: • FAF heated houses use more heating energy than zonal electric heated houses, so the savings should be at least equal to zonal, if not more. • Notes: • Savings are “provisionally” deemed. • Whether these savings would have been approved under the new proposed guidelines is questionable. • Both decisions were made with the following pressure from RTF stakeholders: “We need a deemed value from the RTF in order to run the program.” • Savings for manufactured homes were proposed at the September 2008 meeting, but not approved. • September 2010, the RTF announced it had mistakenly published deemed savings for DHP’s in manufactured homes. • BPA has requested the RTF look into properly deeming the measure.

  3. Issues with the FAF “Equal or Better” Savings Theory • How will the FAF thermostat interact with the Ductless Heat Pump thermostat? • Depends on occupant behavior (???) • How should the occupant control the temperature in other parts of the house? • Using the FAF will probably cause decreased savings from DHP • Should the occupant try to use the duct system to deliver “DHP heat” to the rest of the house? (NO!!!) • Turning off the FAF could cause comfort issues

  4. Baseline Energy Consumption(SEEM runs) • Notes: • Single Family SEEM runs have been calibrated to billing analyses; manufactured home runs have not. • These SEEM runs assume fully weatherized houses.

  5. Proposed Measures • NOTE: These values are for illustrative purposes only. The purpose of this presentation is to show that these deemed measures should not be created.

  6. Primary Issue (needed for provisional) [Next] Primary Issue (needed for deemed)

  7. Recommendation: Do Not Deem at this Time • What would be needed to deem: • Data • Baseline Energy Consumption • Efficient-Case Energy Consumption • Specific to Manufactured Homes with FAF heating systems • Calibration of the engineering model to the data • Estimated Level of Effort to Deem = High • Alternatives to Deeming • Standardized Protocol • Possible Alternative • Would need same data as for deeming • Custom Protocol • Poor Alternative • Too expensive. Small savings. • Run a program and perform an impact evaluation to determine savings • Good Alternative

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