1. No category

Net Zero Energy: Ready for Prime Time?
Habitat Studio NetZero Energy Houses so far
• Started with CMHC’s
•
•
Equilibrium Initiative
54000 C Heating
Degree Days
-340 C Design Temp
Riverdale NetZero
Belgravia NetZero
Parkland NetZero
LEED Platinum
Mill Creek NetZero
South Windsor Park
NetZero
Holyrood Near
NetZero Retrofit
Habitat Studio Net Zero houses currently under
construction
Allen Residence
Kosowan Ferrero Residence
Shute Salvalaggio Residence
Kennepohl Franchuk Residence
NRCan R2000 Net Zero Energy Pilot
Basement
Main
Second
Kennepohl Franchuk
Residence
House area is ~ 2250 sq. ft -3
bedrooms with a finished
basement-
North
South
Net Zero in 10 easy steps
•
•
•
Site assessment
Preliminary design
Renewable Energy Collection
Optimize passive solar if available
Energy Reduction
•
Model the energy performance of your
preliminary design
•
Optimize the building envelope and
passive solar gain using the energy model
•
Reduce base loads
•
•
Domestic hot water
Lighting and appliances
•
Evaluate Solar Thermal, Air Source
Heat Pumps and Geothermal
•
Size PV to meet remaining total load
•
Finish detailed architectural and system
design
Use modelling to optimize the cost of conservation measures
Cost of the conservation measure
Cost per kilowatt-hour/year (kWh/a) of any
energy conservation measure
=
energy saving in kilowatt-hours per
year(kWh/a)
Frost walls
R34- 4"EPS + R22 in 2x44 24”Oc
Under slab
R16 - 4” Type 2 EPS
Walls
R40- 12" Double 2x4 , 24" OC
Attic
R 80 Cellulose
Windows
Tri glazed fibreglass, R5.3/R8.3 COG
Airtightness .43 ACH - Caulked poly
Air Barrier / Vapour Barrier
6 mil CGSB poly
Acoustical sealant
Typar
Air
Vapour
Energy Balance
megajoules
kWh
Gross space heating Load*
60463
16795
Useable internal gains
20534
5704
Useable solar gains
19579
5439
Auxillary energy required (Net space
heating)
23763
6601
Space Heating( with Fujistu ASHP)
16142.4
4484
Space Cooling( with Fujistu ASHP)
208.8
58
DHW (with ASHP and DWHR
5356.8
1488
Lighting, appliances, and misc, electrical
22204.8
6168
Total annual energy required
43912.8
12198
Expected output from 39- 275 Watt Heliene Modules on a
6:12 pitch roof (10725 installed watts)
12880
* Design heat loss at -34⁰C is 9120 watts
Solar Access
Sunpath
S
Site Plan January 15
Monthly solar access
Useable passive solar
gains per HOT2000
(megajoules)
Available passive solar
gain from Solmetric
Suneye
Adjusted passive solar
gains (megajoules)
January
2230
65%
1450
February
2613
80%
2090
March
3105
95%
2950
April
2102
100%
2102
May
1286
100%
1286
June
403
100%
403
July
189
100%
189
August
294
100%
294
September
1288
100%
1288
October
2087
90%
1878
November
2073
75%
1555
December
1906
50%
953
19576
16438
Passive solar gains are expected to be ~3100 megajoules (830 kWh) less than the Hot2000 prediction
Stale air exhaust
from kitchen,
bathrooms
and laundry
Mini split indoor
unit c/w blower
Mini split outdoor unit
Exhaust stale air out
Transition
supply duct
Fresh air to house
Fresh air from
outside
10kW Thermolec
Post Heater
12" round duct to
supply heating and
fresh air to house.
500CFM at
< 0.36 in.WG
12 " return air from house
*Needs EGH 86 or
better envelope
HRV
Controller to sync mini split fan
with thermostat and post heater
Heating and ventilating with a small mini split air source heat pump
0"
1"
13"
25"
37"
49"
61"
73"
85"
97"
109"
121"
133"
145"
157"
169"
181"
193"
205"
217"
229"
241"
253"
265"
277"
289"
301"
313"
325"
337"
349"
361"
50"
Fujitsu Halcyon cutoff (~-20℃)
45"
40"
35"
30"
25"
Series1"
20"
15"
10"
5"
Edmonton Heating Degree Days 2013
Mini Splits vs Large Central Systems
•
ASHP’s like the Mitsubishi Zuba Central
can add ~$8000 to heating system costs.
•
Ducted mini splits can save heating system
cost if paired with the smaller heat load
that results from a better building
envelope.
AO Smith SHPT 50 Gallon air source heat pump hot water tank
ERS 83
ERS 88
Passive House
Envelope Specifications
Foundation
R25- 2" EPS +R20 frost
wall
R37- 4"EPS + R22 Frost wall
R52- 6" EPS + R28 Frost wall
Underlab
Insulation
R9- 2" Type 2 EPS
R18- 4" Type 2 EPS
R27
Walls
R 24 - 2x8, 24"O.C. R28
Batt
R40- 12" Double 2x4 , 24" OC
R67- 16" Double 2x4with 2x4
wiring chase, Cellulose plus R14
roxul
Ceiling
R60- cellulose
R80 - cellulose
R100- cellulose
Windows
Fibreglass with R5.33/
R8.33 COG
Fibreglass with R5.33/R8.33 COG
~R 10 COG Passive House
windows
Air tighness
1.5 ACH -Caulked poly
with Habitat details
.03 ACH- Taped OSB, even more
.5 ACH - Caulked Poly with Siga
care and attention, Passive house
tape and extra care and attention
windows
Mechanical Systems
Heating system
Large central air source
heat pump- Mitsubishi
Zuba Central
Ducted mini split air source heat
pump- Fujitsu
Electric baseboards
HRV
VanEE 2000HE
VanEE 2000HE
Zehnder Novus with ground loop
preheat
Hot Water
Air source DHW
Air source DHW
Air source DHW
Lowest Cost Net Zero with an EGH ~83 Envelope
Space Heat Cooling
Load (kWh/ year)
C.O.P. (Coefficient of performance)
Remaining Electrical Load (kWh/year)
Installed PV watts with no shading
20490
4550
5840
1.7
3.0
1.6
1.0
5353
333
2844
5840
14370
Shading Adjustment
%
100%
14370
Modules needed
57
PV Area Needed
1035
14370
890
Envelope upgrade cost**
$0
Air source DHW upgrade cost**
Total
1000
PV Area Available
Electrical baseboard cost**
L.A.M.E.
9100
Panel Size - 18 sq ft , 250 Watts
PV Cost (at $2.75 per installed watt)
DHW
Sqft.
$39,518
$0
$500
Air Source Heat pump upgrade cost (Zuba)**
$8,000
Total cost to upgrade to net zero **
$48,018
** Cost in relation to EGH 83 envelope
with high efficiency natural gas
furnace and hot water tank
Lowest Cost Net Zero with an EGH ~88 Envelope
Space Heat Cooling
Load (kWh/ year)
C.O.P. (Coefficient of performance)
Remaining Electrical Load (kWh/year)
Installed PV watts with no shading
5840
1.7
3.0
1.6
1.0
3882
333
2844
5840
12899
Shading Adjustment
%
100%
10750
Modules needed
39
PV Area Needed
704
10750
890
PV Cost (at $2.75 per installed watt)
$29,561
Air Source Heat pump upgrade cost (minisplit)**
Total cost to upgrade to net zero **
17990
4550
$15,000
Air source DHW upgrade cost**
Total
1000
Envelope upgrade cost**
Electrical baseboard cost**
L.A.M.E.
6600
Panel Size - 18 sq ft , 250 Watts
PV Area Available
DHW
Sqft.
$0
$500
$0
$45,061
** Cost in relation to EGH 83 envelope
with high efficiency natural gas
furnace and hot water tank
Lowest Cost Net Zero with a Passive House Envelope
Space Heat Cooling
Load (kWh/ year)
C.O.P. (Coefficient of performance)
Remaining Electrical Load (kWh/year)
Installed PV watts with no shading
5840
1.0
3.0
1.3
1.0
2100
0
3500
5840
11440
Shading Adjustment
%
100%
11440
Modules needed
46
PV Area Needed
824
11440
890
PV Cost (at $2.75 per installed watt)
$31,460
Electrical baseboard cost**
-$10,000
Total upgrade to net zero cost**
12490
4550
$45,000
Air Source Heat pump upgrade cost **
Total
0
Envelope upgrade cost**
Air source DHW upgrade cost**
L.A.M.E.
2100
Panel Size - 18 sq ft , 250 Watts
PV Area Available
DHW
Sqft.
$500
$0
$66,960
** Cost in relation to EGH 83 envelope
with high efficiency natural gas
furnace and hot water tank
ERS 82
ERS 88
Passive House
Envelope Specifications
Foundation
R25- 2" EPS +R20 frost
wall
R37- 4"EPS + R22 Frost wall
R52- 6" EPS + R28 Frost wall
Underlab
Insulation
R9- 2" Type 2 EPS
R18- 4" Type 2 EPS
R27
Walls
R 24 - 2x8, 24"O.C. R28
Batt
R40- 12" Double 2x4 , 24" OC
R67- 16" Double 2x4with 2x4
wiring chase, Cellulose plus R14
roxul
Ceiling
R60- cellulose
R80 - cellulose
R100- cellulose
Windows
Fibreglass with R5.33/
R8.33 COG
Fibreglass with R5.33/R8.33 COG
~R 10 COG Passive House
windows
Air tighness
1.5 ACH -Caulked poly
with Habitat details
.03 ACH- Taped OSB, even more
.5 ACH - Caulked Poly with Siga
care and attention, Passive house
tape and extra care and attention
windows
Mechanical Systems
Heating system
Large central air source
heat pump- Mitsubishi
Zuba Central
Ducted mini split air source heat
pump- Fujitsu
Electric baseboards
HRV
VanEE 2000HE
VanEE 2000HE
Zehnder Novus with ground loop
preheat
Hot Water
Air source DHW
Air source DHW
Air source DHW
Net Zero Energy: Ready for Prime Time ? !
www. habitat-studio.com