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-CommitteeJune 12, 2014

Mira Vowles, P.E., CEM Emerging Technology Project ManagerBPA 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. VC HP Load Based Testing (Ron)

3. VC HP Field Test Results (Tianzhen)

Plus if time allows:

• School VRF energy-savings (Mira)

• 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 FlowHeat 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: http://www.nwcouncil.org/energy/rtf/subcommittees/vchp/Default.htm

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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 Load Based Testing

Ron Domitrovic, with EPRI

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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 Field Test Results

Tianzhen Hong, with LBNL

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

Next Meeting 7/23/14 at 9 am

Suggestions for agenda items?

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

Pre HVAC Retrofit (June 2006 - June 2009)

Post HVAC Retrofit (February 2010 - February 2013)

Post HVAC VRF Schedule Adjustments (March 2013 - May 2014)

-

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

450,000

389,608 334,147 294,245

55,461

39902

55461

Washington Elementary School Weather Normalized Annual Electricity Usage and Savings (kWh)

from HVAC Upgrade and Schedule Adjustments

kWh Annual Usage kWh savings from HVAC retrofit kWh savings from schedule adjust

Wea

ther

Nor

mal

ized

Annu

al k

Wh

Usag

e 14.2% 26.2%