Transcript Prioritization of VC HP Measures Variable Capacity Heat Pump Measure RTF Sub-Committee June 22, 2011 meeting.

Prioritization of VC HP Measures
Variable Capacity Heat Pump Measure RTF Sub-Committee
June 22, 2011 meeting
Prioritization Overview
 Roadmapping generated a list of over 30 VC HP applications, which
were screened for the 5 highest priority measures.
 These 5 measures were further evaluated in this prioritization.
 Questions were sent to over 20 people and 11 responses were
received.
 The prioritization consisted of four questions, evaluating:
1.
2.
3.
4.
Expected savings potential for each measure;
Payback periods for each measure;
Capture measure specific drivers
Capture measure specific barriers.
.
2
Top Five VC HP Measures
1) Install a DHP mini split, replacing electric resistance heat without any air
conditioning for a commercial application in a converted house.
2) Install DHP mini splits in small retail (less than 20,000 SF), conditioned by splitsystem heat pumps.
3) Install a VRF multi split-system in a small or medium office (less than 100,000
SF), replacing the existing rooftop heat pumps or air conditioning units with a
energy-recovery-ventilator (ERV).
4) Install a VRF multi split-system with heat recovery capability in a small or
medium office (less than 100,000 SF), conditioned by multiple air-source heat
pumps or air conditioning units with electric heat.
5) Install a VRF multi split-system with heat recovery capability in any
commercial building with constant heat source, such as a data center, replacing
electric heat.
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Evaluation
Results - Scores
By Score
VC HP Measure
Average Scores (out of 5)
Top 5 VCHP Measure Scores
5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
Commercial application in
a converted house: electric
resistance replaced by
DHP mini split
Small and medium office:
heat pump or AC with
electric heat, replaced by
VRF with heat recovery
Expected Energy Savings
1- less than 10%
2- between 10%-20%
3- between 20%-30%
4- between 30%-40%
5- more than 50%
Small and medium office:
rooftop unit replaced by
VRF with energy recovery
ventilator
Applications
Payback Period
1- more than 20 years
2- between 10-15 years
3- between 5-10 years
4- between 2-5 years
5- less than 2 years
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Small retail: split system
heat pump replaced by
DHP mini split
Total Scores Combined
(equal weights)
Small and medium office:
heat pump or A/C with
electric heat replaced by
VRF
Ranked VC HP Measure Scores
Top 5 VCHP
Measure Ranking
Commercial
application in a
converted
house: electric
resistance
replaced by DHP
mini split
Small and
medium office:
heat pump or AC
with electric
heat, replaced by
VRF with heat
recovery
Small and
medium office:
rooftop unit
replaced by VRF
with energy
recovery
ventilator
Small retail: split
system heat
pump replaced
by DHP mini
split
Small and
medium office:
heat pump or
A/C with electric
heat replaced by
VRF
Expected Energy
Savings
1
2
3
5
4
Payback Period
1
5
4
2
3
Total Scores
Combined
(equal weights)
1
2
3
4
5
1
Ranked as the best within the corresponding criteria
2
Ranked as the second best within the corresponding criteria
Measure Specific Drivers
What are the things you
like about each
application?
Duane
Lewellen
1) Commercial
application in a
converted house:
electric resistance
replaced by DHP mini
split
Better zoning,
instant energy
savings
Electric res to
HP greatest
savings
Low cost, low
ambient
performance
reduces winter
peaks, simple
measure
Save fan
energy if
existing is
furnace;
occupant will
like cooling
benefit
Good savings
& quick
payback
Easy to
implement
(similar to res
applications)
2) Small retail: split
system heat pump
replaced by DHP mini
split
Lower demand
on grid
Zoned heat
pump vs
central system
Low cost, low
ambient
performance
reduces winter
peaks
Fan savings
Some energy
savings
Easy to
implement
(similar to res
applications)
3) Small and medium
office: rooftop unit
replaced by VRF with
energy recovery
ventilator
Excellent
energy
savings,
improved
control and
zoning,
Potential for
heat reclaim
from core
zones and
exhaust
systems
Large potential
ventilation
energy
savings, low
ambient
performance
reduces winter
peaks
ERV is
dedicated OA
system. Can
use DCV with
CO2 sensor.
Reduce fan
energy
4) Small and medium
office: heat pump or
A/C with electric heat
replaced by VRF
Excellent
energy
savings,
improved
control and
zoning
Potential heat
reclaim no
electric strip
for aux
low ambient
performance
reduces winter
peaks, simpler
measure
5) Small and medium
office: heat pump or AC
with electric heat,
replaced by VRF with
heat recovery
Energy
recovery
between
zones
Doas
ventilation plus
zoned hp plus
vrf
Low ambient
performance
reduces winter
peaks
Mira
Joel Jackman
(PSE)
Aquila
Velonis
(Cadmus)
Mike Cundiff
Mark Jerome
Erin Rowe
Chris
Wolgamott
O. Mattias
Jarvegren
Aaron Winer
Giving A/C
without having
to install duct
work. Should
improve
comfort as
well
Easy install,
easy to offer
incentive.
Low cost, fast
installation
with quick
payback.
get a lot of
reqests for this
in small retail
Increase unit
efficiency to a
level higher
than most split
systems
Easy install,
easy to offer
incentive.
Low cost, fast
installation
with quick
payback
should be
good energy
savings/
ventilation will
be efficient
not really
applicable to
new
construction
Not sure
Ventilation
added.
Larger
efficiency
impacts, would
"clean up"
equipment
A/C w/ elec Ht
will save most.
both will save
fan energy
Should be
good energy
savings
get a lot of
requests for
this
Not sure
Easy install,
easy to offer
incentive.
Combining
existing
functionality
into one
system
A/C w/ elec Ht
will save most.
both will save
fan energy
Should be
good energy
savings/
ventilation will
be efficient
get a lot of
requests for
this
Not sure
Ventilation
added.
Combining
existing
functionality
into one
system, high
tech solution
6
Measure Specific Barriers
What are the potential
problems or concerns
with each application?
Mike
Cundiff
Duane
Lewellen
Mira
Joel Jackman
(PSE)
Mark Jerome
Aquila
Velonis
(Cadmus)
Erin Rowe
Chris
Wolgamott
O. Mattias
Jarvegren
Aaron Winer
1) Commercial
application in a
converted house:
electric resistance
replaced by DHP mini
split
Life of
building am
unclear whether
existing electric
resistance heat is
kept as back-up,
unoccupied
temperature
setback may not
occur, adds
cooling loads
Ventilation
required;
cooling load
reduces
savings
aesthetics
Poor
installation
practices
Don't foresee a
huge uptake for this
measure
How many
of these still
have electric
resistance
heat at this
point
No problems or
concerns.
Occupant
education re:
operation
2) Small retail: split
system heat pump
replaced by DHP mini
split
Retail
turnover
unoccupied
temperature
setback may not
occur, difficult to
coordinate
ventilation system
operation
Ventilation
required;
reduced fan
energy
aesthetic
Minimal
energy
savings
cost-effectiveness is
main concern since
the efficiency gain
from a code heat
pump to mini split
isn't huge
Lease vs
Own, who
going to pay
for the
retrofit
No ventilation.
Occupant
education re:
operation
3) Small and medium
office: rooftop unit
replaced by VRF with
energy recovery
ventilator
Initial cost
high
unoccupied
temperature
setback may not
occur, difficult to
coordinate
ventilation system
operation
If old RTU is
used as ERV it
may require
significant
refurbishment.
May be better
to replace it.
more
complicated
commissioning
and installation
office size could
really impact costeffectiveness
significantly
High costs,
long
payback
Added
ventilation with
VRF
complicates
install and
increases cost.
Occupant
education re:
operation,
medium-high
initial cost
4) Small and medium
office: heat pump or A/C
with electric heat
replaced by VRF
High initial
cost
unoccupied
temperature
setback may not
occur, difficult to
coordinate
ventilation system
operation
Ventilation
required.
more
complicated
commissioning
and installation
size of office could
impact costeffectiveness
significantly
High costs,
long pay
back
No ventilation.
Occupant
education re:
operation, high
initial cost
High initial
cost
unoccupied
temperature
setback may not
occur, difficult to
coordinate
ventilation system
operation
more
complicated
commissioning
and installation
design criteria to
ensure adequate
heat recovery could
vary significantly per
project and energy
savings would be
hard to predict
High costs,
long pay
back
Added
ventilation with
VRF
complicates
install and
increases cost.
Occupant
education re:
operation, high
initial cost
5) Small and medium
office: heat pump or AC
with electric heat,
replaced by VRF with
heat recovery
Data
Room
application
may
require
redundant
system
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Discuss Other Approaches for VC HP Measures
• Upstream incentives
• Equipment incentives based on EER
• Whole building performance incentives
• Other
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