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 August 28, 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.VRF System ECAM Analysis (Eva) 3.Load Based Testing (Ron) 4.ASHRAE HQ VRF System (Ali) 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 Sacramento Drill Tower Data BEFOREAFTER

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 BPA ECAM Analysis Energy Charting and Metrics tool FREE Excel Add In available at: IPMVP-Option C regression modeling of Monthly energy data Average monthly temperature (primary variable) Pre & post models of kWh/day vs. average monthly temperature ECAM model statistical validation metrics CV(RMSE) or Standard Error % >20% Fractional Savings Uncertainty <50% Residuals R2 > 75% Net Determination Bias<0.005%

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 VRF System ECAM Analysis Eva Urbatsch, BPA

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 Sacramento Drill Tower Raw Data (VRF system installed in June of 2008) NAG kWh = natural gas therms, converted to kWh

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 Sacramento Drill Tower Pre & Post Electricity Use

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 Forensic Data Analysis These points occurred July-Oct 08 (immediately post-install) and May-June 09

Slide 12 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 Sacramento Drill Tower Baseline & Post Models

Slide 13 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 Sacramento Drill Tower Energy Use for a “normal” year Baseline: 374,405 kWh Post: 157,511 kWh Savings: 216,894 kWh

Slide 14 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 Conclusions There is a VRF system startup learning curve! Natural gas savings ~94% of baseline Electricity savings ~20% of baseline Total savings ~58% of total energy use

Slide 15 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 Load Based Testing Ron Domitrovic, EPRI

Slide 16 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 ASHRAE HQ VRF System Ali Beglar, Daikin

Slide 17 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: 9/25/13 at 10 am Potential topics: Other VRF research projects (all) Suggestions for future meetings (all)