RTF Management Updates

Jennifer LightRegional Technical Forum

December 8, 2015

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Topics for Today

• HVAC Calculator• RTF Solicitations• Upcoming Topics

Background• RTF’s “Commissioning, Controls, & Sizing” UES measure

calls for sizing to a 30°F balance point– This means the heat pump can provide 100% of the house’s

heating needs at outdoor temperatures of 30°F and warmer• BPA asked the RTF to update the calculator it developed

years ago– Main reason: add variable capacity heat pumps

• Primary purpose of the sizing calculator:– Simplify heat pump heating season sizing as much as possible

• Detailed capacity curves are not always readily available to installers, utilities, and evaluators

• AHRI-rated capacities at 47°F are available

3 – HVAC Calculator

Improvements Made to New Calculator1. Added sizing for variable capacity heat pumps2. Removed cooling sizing calculations and detailed window input requirements

– This simplification was made because the measure savings apply to heating only3. Re-designed to be a house-specific calculation

– Added a “foundation type” input– Added a “stories above grade” input– Removed option to set insulation levels based on home vintage

• Now component insulation levels are required inputs– Added “infiltration level” input– Added “duct losses” input

4. Heat Pump Capacity Curve Improvements– Single-Speed: Established an average “Capacity@30°F/Capacity@47°F” ratio (0.71) based on

recent BPA program installations• Previously based on one Lennox unit

– Variable-speed: Capacity curves are model and size-specific, so calculator handles each model separately

• New models will need to be manually added to the calculator

5. Output more specific: Minimum required AHRI-rated heating capacity at 47°F– Previously given in nominal tons

6. Added warnings for out-of-range inputs, etc.

4 – HVAC

Review• Reviewers so far:

– Jim Haberman (BPA)• New calculator’s outputs compare well to the old calculator

– Bruce Manclark (CleaResult)– Bob Davis (Ecotope, RTF member)

• We’re looking for more reviewers:– Open Comment Period: Now through December 18,

2015• Send comments or questions to Adam Hadley

– adam@hadleyenergy.com or 808.828.6550

5 – HVAC Calculator

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Screenshot: Old

Calculator

Screenshot:New Calculator

7 – HVAC Calculator

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Ignore these lines

Single Speed Heat Pump Unit Normalized Capacities (~68% of BPA program units represented here) plotted on a balance point worksheet

Ignore these lines

VCHP’s models not as well-behaved

VCHP MFG A VCHP MFG B

Ratio: Capacity @ 30 deg F/ Capacity @ 47 degFNominal 2 ton 3 ton 4 ton 5 tonMFG A 0.73 0.71 0.71MFG B 0.96 0.98 1.01 1.15MFG C 1.11 0.92 1.04 1.00

9 – HVAC Calculator

RTF Solicitations10 – RTF Solicitations

• RTF Assistant – Last day to apply 12/11/15 (more info)

• RFP for Contract Analyst – Proposals due 12/18/15 (more info)

• RFP for QA/QC Services – Proposals due 12/31/15 (more info)

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Upcoming Meeting Topics

Anticipated in early 2016• Residential LED Fixtures (new measure)• DHP for New Construction (new measure)• DHP for Single Family (Existing Construction) – measure updates• Commercial Freezers and Refrigerators• Commercial Non-Residential Network Computer Power Management• Agricultural Lighting – Area Lights• Multifamily Calibration, Weatherization, and New Construction• Low-e Storm Windows MH (and MF?)• New Homes Standard Protocol