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New MT Houses with Ground Source Heat Pumps
Energy Savings and Costs
June 2nd, 2009Regional Technical Forum
1
Background• On March 2nd, 2009, the RTF approved energy savings and
costs for MT Houses with – Zonal Electric, Electric FAF w/ and w/o CAC, and Air Source Heat Pump
heating systems• Savings for cases without PTCS duct sealing range from 3,400 to 7,200 kWh/year
(HZ’s 2 & 3)• Savings for cases with PTCS duct sealing range from 4,800 to 9,500 kWh/year (HZ’s
2 & 3)• Savings assume like pre- and post-heating system types
• Recently, the RTF was requested by Montana utilities to1. Analyze energy savings and costs for MT Houses with GSHP’s,
including “conversions” from electric forced air furnaces to GSHP’s, and
2. Look at the cost-effectiveness for GSHP’s in large homes.
2
Background: MT House Specifications
3
Background: MT House Specifications(continued)
Reminder: Specs were approved at the January 6, 2009 RTF meeting
4
New MT House Input Assumptions• Energy Savings
– SEEM FAF w/CAC Use adjusted for GSHP COP and SEER• GSHP Heating COP = 3.3 (heating season average)• GSHP SEER = 16 (versus 13 SEER modeled in SEEM)
• Cost:
– Where baseline is Zonal or FAF:• $25 annual O&M (outdoor unit maintenance)• $2,000 every 20 years (component replacement)
• All other savings, cost, and measure life assumptions remain the same as the March 2nd analysis.
5
Unit Size (Tons)
Total GSHP System Cost
Incremental Cost over
ASHP
Incremental Cost over
FAF
Incremental Cost over
Zonal
Post92 Single Family Contruction Geothermal Heat Pump - Zone 2
3.5 15,400$ 10,100$ 15,400$ 18,894$
Post92 Single Family Contruction Geothermal Heat Pump - Zone 3
4 16,900$ 11,300$ 16,900$ 20,394$
Capital Cost – Heating Zone 2
6
$-
$5,000
$10,000
$15,000
$20,000
$25,000
$30,000
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Incr
emen
tal C
apit
al C
ost
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 2, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Capital Cost – Heating Zone 3
7
$-
$5,000
$10,000
$15,000
$20,000
$25,000
$30,000
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Incr
emen
tal C
apit
al C
ost
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Results – Energy Savings – HZ 2
8
-
5,000
10,000
15,000
20,000
25,000
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Annu
al S
avin
gs (
kWh/
year
)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 2, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Results – Energy Savings – HZ 3
9
-
5,000
10,000
15,000
20,000
25,000
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Annu
al S
avin
gs (
kWh/
year
)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Results – B/C – HZ 2
10
-
1.0
2.0
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Socie
tal B
/C (u
sing
5th
Pla
n)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 2, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Results – B/C – HZ 3
11
-
1.0
2.0
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Socie
tal B
/C (u
sing
5th
Pla
n)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Results – Levelized Cost – HZ2
12
-
10
20
30
40
50
60
70
80
90
100
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Net
Lev
eliz
ed C
ost (
mill
s/kW
h)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 2, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Results – Levelized Cost – HZ3
13
-
10
20
30
40
50
60
70
80
90
100
Zonal FAF w/o CAC FAF w/CAC Heat Pump GSHP
Net
Lev
eliz
ed C
ost (
mill
s/kW
h)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
Inputs for Large Homes• Quick “development” of a new large home prototype:
– Added a second story to the 2688 ft2 basement prototype– Results:
• 4032 ft2
• Doubled window area, wall area, and door area• No change to attic, slab, or basement wall areas
• Quick SEEM Runs– Kalispell weather only– Did not re-run cooling (used results from 2688 basement)– Did not re-run air-source heat pump cases
• Cost:
– Where baseline is Zonal or FAF:• $40 annual O&M (outdoor unit maintenance)• $3,000 every 20 years (component replacement)
– Shell measure costs increased due to increased window, wall, and door areas14
Unit Size (Tons)
Total GSHP System Cost
Incremental Cost over
ASHP
Incremental Cost over
FAF
Incremental Cost over
ZonalLarge House - Heating Zone 3 7 25,900$ 18,800$ 25,900$ 31,142$
Capital Cost – Heating Zone 3
15
$-
$5,000
$10,000
$15,000
$20,000
$25,000
$30,000
$35,000
$40,000
Zonal FAF w/o CAC
FAF w/CAC Heat Pump GSHP
Incr
emen
tal C
apita
l Cos
t
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
4032 ft2 House (Kalispell)
Results – Energy Savings – HZ 3
16
-
5,000
10,000
15,000
20,000
25,000
30,000
Zonal FAF w/o CAC
FAF w/CAC Heat Pump GSHP
Annu
al S
avin
gs (
kWh/
year
)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
4032 ft2 House (Kalispell)
Results – B/C – HZ 3
17
-
1.0
2.0
Zonal FAF w/o CAC
FAF w/CAC Heat Pump GSHP
Socie
tal B
/C (u
sing
5th
Pla
n)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
4032 ft2 House (Kalispell)
Results – Levelized Cost – HZ3
18
-
10
20
30
40
50
60
70
80
90
100
Zonal FAF w/o CAC
FAF w/CAC Heat Pump GSHP
Net
Lev
eliz
ed C
ost
(mill
s/kW
h)
Base-case Heating System Type
New MT House & Convert to GSHPHeating Zone 3, Cooling Zone 1 - w/o PTCS
Basement
Sealed Crawlspace
Slab on Grade
Vented Crawlspace
4032 ft2 House (Kalispell)
Decisions• Approve Savings and Costs for MT House with GSHP GSHP?
• Approve Savings and Costs for MT House with non-GSHP baseline heating systems? (ASHP GSHP; FAF GSHP; and/or Zonal GSHP)
– Issues1. This would be the RTF’s first heating system “conversion” measure for new construction. 2. In a new construction situation, how does a program know what someone would have put in?
– Options1. Disallow heating system “conversions” for new construction measures2. Approve the savings and costs that assume non-GSHP heating systems as the baseline
A. Allow programs to decide what to use as the baseline heating system type on a case-by-case basis, orB. RTF to choose a baseline heating system, orC. RTF to develop a weighted average savings based on an assumed mix of baseline heating equipment
• “Large home” analysis– Issues
1. Would programs be willing/able to screen out participants based on house size? 2. If only large houses are allowed, could be interpreted that the Region supports increased house sizes.
– Options 1. Pursue making a distinction for large house sizes in the savings and cost-effectiveness analysis
A. Refine the large home prototype and associated analysis for GSHP’sa) Put in place a “large home” measure categoryb) Incorporate the large home results by developing an average weighting for the large home prototype
B. Develop a deemed calculator with specific house information as inputs (based on SEEM).2. Continue using the existing method, which incorporates a weighted average house size based on the
current prototypes19
