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Variable Capacity Heat Pump RTF Sub-Committee September 25 , 2013

Variable Capacity Heat Pump RTF Sub-Committee September 25 , 2013. Mira Vowles, P.E., CEM Emerging Technology Project Manager BPA Energy Efficiency . Meeting Topics. VC HP Overview ( M ira) LBNL VRF Project (Tianzhen) NEC Article 220.84 VRF Project (Marcia) Plus if time allows:

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Variable Capacity Heat Pump RTF Sub-Committee September 25 , 2013

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  1. Variable Capacity Heat Pump RTF Sub-CommitteeSeptember 25, 2013 Mira Vowles, P.E., CEM Emerging Technology Project Manager BPA Energy Efficiency

  2. Meeting Topics • VC HP Overview (Mira) • LBNL VRF Project (Tianzhen) • NEC Article 220.84 VRF Project (Marcia) • Plus if time allows: • Other VRF research projects (all) • Suggestions for future meetings (all)

  3. Variable Capacity Heat Pumps (VC HP = VRF + DHP) + Variable Refrigerant FlowHeat Pump System Ductless Heat Pumps

  4. Variable Refrigerant Flow (VRF) Systems • VRF systems, either heat-pump or heat-recovery models, provide heating and air-conditioning, with: • Inverter driven outdoor-unit compressors and condenser fans, providing improved part-load and low-ambient performance, • Multiple indoor-units with multi-speed fans, electronic expansion valves and integrated thermostats, • 3. Refrigerant piping network for heat transfer, • Integrated control system, and • Ventilation provided by VRF system, natural ventilation or a dedicated outside air system (DOAS).

  5. VC HP Sub-Committee • Sub-Committee of the Regional Technical Forum (RTF) • 2. Purpose: develop and recommend VC HP measures with • high consensus methodology to estimate and verify electrical savings • specification for cost effective installations that ensures persistent savings • 3. Minutes and presentations are posted at: http://www.nwcouncil.org/energy/rtf/subcommittees/vchp/Default.htm

  6. LBNL VRF Project • Tianzhen Hong, LBNL • Phase 1 –complete • Title 24 prescriptive home with 3 ton, 3 zone VRF system • EnergyPlus model with custom algorithms • Phase 2 –underway • 2,000 SF Title 24 prescriptive home (Stockton, CA), conditioned by a 3 ton, 3 zone VRF system • M&V to validate EnergyPlus model and Title 24 compliance tools • Phase 3 –future • Test at LBNL FlexLab

  7. NEC Article 220.84 • Marcia Karr, WSU Energy Program • NEC Article 220.84 allows derating Multi-Family electric-service size: • based on the number of multi-family dwelling units, with electric heat and cooking equipment; • Demand factors range between 23 and 45%, resulting in first-cost electric-service cost savings; but • Appeal needed for VRF systems.

  8. NEC Table 220.84

  9. NEC Article 220.84 VRF Project Appeal • City of Portland appeal for multi-family building, which could result in first-cost electric-service cost savings • Supporting metering on 2 existing Portland buildings: • Both with 1st floor retail and 4 floors of multi-family • One building with electric baseboard heat, and • One building with VRF system; • To verify VRF system load diversity is similar to electric baseboard heat, amperage will be metered for 30 days: • Both whole building amperage, and • amperage for two dwelling units in each building.

  10. Next Meeting: 10/23/13 at 10 am • Potential topics: • DOE ASRAC (Paul Doppel) • Other VRF research projects (all) • Suggestions for future meetings (all)

  11. November Meeting 11/20/13 at 10 am • Potential topics: • BPA’s Residential VC HP Research • Other

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