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 March 27, 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.School VRF System Case Study (Mira) 3.School VRF System Best Practices (Mira) 4.Mitsubishi VRF Integration & Training Resources (Mike) Plus if time allows: Other VRF research projects (all) Topic 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 School VRF System Case Study Baseline: unit heaters with electric heat and no cooling VRF & DOAS systems installed in 2010 Electricity savings 20% estimated 9% actual

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 School VRF System Findings No setback temperatures programmed No holiday schedules programmed No system integration No ventilation system heat-recovery Insufficient staff training No remote service software, central control or alarms programmed

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 School VRF System Best Practices 1.System design and integration 2.How simple is the user interface? 3.Commissioning and training 4.System operation

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 System Design and Integration 1)Are VRF and ventilation systems integrated with other systems? 1)What needs to be centrally controlled (on/off, optimal start, holidays, etc.)? 2)What needs to be centrally monitored (space temperatures, SAT, CO2, etc.)? 2)Is the system cost effective on a life-cycle basis? 1)Is a VRF-HR system cost effective? 3)Is the ventilation system design optimized? 1)Were heat recovery, demand controlled ventilation and economizer considered? 2)Will operation only be during occupied periods?

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 How simple is the user interface? a)Is dedicated staff, ongoing training or a service contract needed? b)How will zones and setpoints be programmed? 1)How will indoor-unit fans operate –auto or continuously on? 2)How will indoor-units operate during defrost, when heat is needed and system is in cooling or when combination ratio is exceeded? c)Are setback temperatures, holidays, optimal start and alarms programmed through the BAS? 1)If programmed through the VRF system, how many holidays can be programmed and how far in advance? d)Does the VRF system clock change automatically for daylight savings?

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 Commissioning and Training a)Who will commission the integrated system? b)Who will train on the integrated system? c)What school staff will be involved during commissioning? d)Are critical points alarmed, monitored and trended? e)Is the remote service software installed and up-to-date? f)Are service contracts well understood, including who to call and what is included?

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 System Operation a)Ensure adequate training and have a plan to document changes and to train new personnel. b)Ensure there is a plan to monitor energy use, and to regularly check system operation. c)Ensure there is a plan to back-up the system regularly.

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 Mitsubishi VRF Integration & Training Resources 1.What’s needed for BAS scheduling of VRF systems? a)What hardware is needed? b)What programming is needed and how is it backed-up? c)What is a range of costs for integration? d)Who typically commissions the integrated system? e)Give examples of good integrated systems in the PNW. f)How can on-site staff stay current with new software, refresh training and back-up their system? g)Without BAS scheduling, how are holidays programmed, how many unique dates can be programmed and how far in advance? 2.Describe regional training resources (what kind of training, where, when and at what cost).

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 Mike Cundiff Regional Commercial Manager Mitsubishi VRF Integration & Training Resources

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 Next Meeting: 4/24/13 at 10 am

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 Daikin VRF Integration & Training Resources 1.What’s needed for BAS scheduling of VRF systems? a)What hardware is needed? b)What programming is needed and how is it backed-up? c)What is a range of costs for integration? d)Who typically commissions the integrated system? e)Give examples of good integrated systems in the PNW. f)How can on-site staff stay current with new software, refresh training and back-up their system? g)Without BAS scheduling, how are holidays programmed, how many unique dates can be programmed and how far in advance? 2.Describe regional training resources (what kind of training, where, when and at what cost).