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
VCHP Lab Testing
Fan and compressor speeds generally track one another
through the operating modes
Compressor speed increases as the outdoor
temperature decrease (reduces aux heat usage)
Cyclic test: no affect on the performance of the system
Frost Accumulation test: no degradation in capacity
output
Savings over federal minimum efficiency unit: 17%
energy savings for Seattle, 19% for Boise
3
N
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
Summary of Field Study
Developed analytical tools to evaluate VCHP energy use
on an annual basis
Good agreement between field data & lab data
VCHPs perform at higher levels than single speed
systems
Modeled performance with field data 25-30%
improvement
Duct losses larger because operate at lower airflows –
however, only ~5% greater
Equipment size, aux controls, setback behavior still
matter
5
N
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
Summary of Field Study
Developed analytical tools to evaluate VCHP energy use
on an annual basis
Good agreement between field data & lab data
VCHPs perform at higher levels than single speed
systems
Modeled performance with field data 25-30%
improvement
Duct losses larger because operate at lower airflows –
however, only ~5% greater
Equipment size, aux controls, setback behavior still
matter
6
N
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
Contact Information
BPA, Lab & Field Testing
Kacie Bedney, Research Engineer
Bonneville Power Administration
503.230.4631
kcbedney@bpa.gov
BPA Emerging Technology
Jack Callahan, Research Technical Lead
Bonneville Power Administration
503.230.4496
jmcallahan@bpa.gov
EPRI, Lab Testing
Walt Hunt. Project Engineer
Electric Power Research Institute
865.218.8184
whunt@epri.com
Ecotope, Field Testing
Ben Larson, Research Scientist
Ecotope, Inc.
206.322.3753, ext 207
ben@ecotope.com
7
O
N