Slide 1 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N Variable Capacity Heat Pump RTF Sub-Committee September 25, 2013 Mira Vowles, P.E., CEM Emerging Technology Project Manager BPA Energy Efficiency

Slide 2 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N Meeting Topics 1.VC HP Overview (Mira) 2.LBNL VRF Project (Tianzhen) 3.NEC Article VRF Project (Marcia) Plus if time allows: Other VRF research projects (all) Suggestions for future meetings (all)

Slide 3 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N Variable Capacity Heat Pumps (VC HP = VRF + DHP) + Ductless Heat Pumps Variable Refrigerant Flow Heat Pump System

Slide 4 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N Variable Refrigerant Flow (VRF) Systems VRF systems, either heat-pump or heat-recovery models, provide heating and air-conditioning, with: 1.Inverter driven outdoor-unit compressors and condenser fans, providing improved part-load and low-ambient performance, 2.Multiple indoor-units with multi-speed fans, electronic expansion valves and integrated thermostats, 3. Refrigerant piping network for heat transfer, 4.Integrated control system, and 5.Ventilation provided by VRF system, natural ventilation or a dedicated outside air system (DOAS).

Slide 5 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N VC HP Sub-Committee 1.Sub-Committee of the Regional Technical Forum (RTF) 2.Purpose: develop and recommend VC HP measures with a)high consensus methodology to estimate and verify electrical savings b)specification for cost effective installations that ensures persistent savings 3.Minutes and presentations are posted at:

Slide 6 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N 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

Slide 7 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N NEC Article Marcia Karr, WSU Energy Program NEC Article 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.

Slide 8 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N NEC Table

Slide 9 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N NEC Article 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: o Both with 1 st floor retail and 4 floors of multi-family o One building with electric baseboard heat, and o One building with VRF system; To verify VRF system load diversity is similar to electric baseboard heat, amperage will be metered for 30 days: 1.Both whole building amperage, and 2.amperage for two dwelling units in each building.

Slide 10 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N Next Meeting: 10/23/13 at 10 am Potential topics: DOE ASRAC (Paul Doppel) Other VRF research projects (all) Suggestions for future meetings (all)

Slide 11 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N November Meeting 11/20/13 at 10 am Potential topics: BPA’s Residential VC HP Research Other