Gulf Coast Green 2012 Tenna Florian & Hazem Rashed-Ali
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Transcript of Gulf Coast Green 2012 Tenna Florian & Hazem Rashed-Ali
POST-OCCUPANCY EVALUATIONS OF
HIGH-PERFORMANCE HOMES
Tenna Florian
Hazem Rashed-Ali
Hacienda Ja Ja: A High Performance Home Lake | Flato Architects
“THERE are NO ZERO-ENERGY HOUSES, only
ZERO-ENERGY FAMILIES.”
- Andy Shapiro, energy consultant
Construction Period: January 2009 to May 2010 (move in)
Conditioned Space: 2,330 square feet
Unconditioned Space: 950 square feet
Architect: Lake | Flato Architects (Tenna Florian, Bill Aylor, Josh Canez, Gus Starkey)
Contractor: Truax Construction (Jeff Truax)
Interior Design: M. Robbins Black (Robin Black)
Landscape Design: Rialto Studio (Pete Hinton)
Lighting Design: George Sexton Associates (George Sexton)
Structural Engineer: Jack Harrison
Solar: Cinco Solar
Mechanical: Southwest Mechanical
TEAM
STATS
LEED Highlights: Platinum Project: 87 points needed and 89.5 achieved
Locations and Linkages: 10 of 10 points available
infill, previously developed, and good access to transit
Sustainable Sites: 14.5 of 22 points available
site stewardship, native landscaping, reduced heat island effect, permeable lot
Water Efficiency: 11 of 15 points available
rainwater harvesting, irrigation demand reduction, and highly efficient fixtures
Energy & Atmosphere: 33 of 38 points available
optimize energy performance, efficient hot H2O systems, appropriate refrigerants
Materials and Resources: 7.5 of 16 point available
environmentally preferable products, waste reduction plan
Indoor Environmental Quality: 11 of 21 points available
moisture control, outdoor air ventilation, local exhaust, ventilated garage
Water Efficiency: 11 of 15 points available rainwater harvesting, irrigation demand reduction, and highly efficient fixtures
Energy & Atmosphere: 33 of 38 points available optimize energy performance, efficient hot water systems, appropriate
refrigerants
Hacienda Ja Ja: A High Performance Home Lake | Flato Architects
POST-OCCUPANCY EVALUATION
OBJECTIVES:
• Verify overall house energy use,
• Compare actual energy use with predicted
energy use,
• Identify potential for performance
improvement,
• Assess success of design strategies,
Hacienda Ja Ja
MONITORING PERIOD:
System installed on Nov. 11, 2010 to present.
Monitoring period reported: January 1, 2011 through December 31, 2011.
Four small periods of communication loss due to power outage (less than 1 hr. each).
One larger period of communication loss (June 13 through 17).
BUILDING OCCUPANCY:
Building not regularly occupied during monitoring period.
Occupancy period approximately one third of the year.
Monitoring / Occupancy Period
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Jan
-11
Feb
-11
Mar
-11
Ap
r-1
1
May
-11
Jun
-11
Jul-
11
Au
g-1
1
Sep
-11
Oct
-11
No
v-1
1
Dec
-11
Pe
rce
nta
ge o
f D
ays
Month Monitored/ Occupied Monitored/ Not Occupied Not Monitored
MONITORING EQUIPMENT: eMonitor:
One eMonitor 12r installed.
Monitors PV power production &
energy use at circuit level.
System online interface
HOBOs:
Five HOBO U12-012 Data loggers
installed.
Monitors temperature, humidity,
lighting levels.
LOCATION OF MONITORING EQUIPMENT
eMonitor-12r
Hobo-U12-012
Post-Occupancy Evaluation
Monitoring equipment
• eMonitor:
• One eMonitor 12r installed.
• Monitors PV power production
& energy use at circuit level.
• System online interface
• HOBOs:
• Five HOBO U12-012 Data
loggers installed.
• Monitors temperature, humidity,
lighting levels.
THE FOLLOWING ISSUES WERE IDENTIFIED / CORRECTED
DIRECTLY OR PARTIALLY DUE TO MONITORING SYSTEM:
Kitchen Instantaneous Water Heater Usage
Solar Domestic Hot Water Pump
HVAC Dehumidifier Settings
PV System Blown Circuit
Green Switch
turned on
User in
house
User left heater on while building was unoccupied resulting in approx. 7
kWh/day usage.
Issue identified from monitoring, resulting in user changing behavior.
51%
17%
20%
1% 7% 3%
64%
22% 1% 9%
4%
Turning off the Kitchen Water
Heater reduced the house’s total
Energy Usage 20%.
0%
0%
Data taken from 24 hr. time frame
Data taken from 24 hr. time frame
User changed
settings
User left AC on dehumidifier setting while the building was unoccupied- resulting
in a high AC energy usage.
Issue identified through monitoring and resulted in user changing behavior.
Problem identified (system
off-line).
Problem fixed (system
online)
Pump stopped working, hot water provided by auxiliary electric heating.
Issue identified through user observation (hot water insufficient), and confirmed using
monitoring system.
Problem fixed
Low PV production issue Identified by user.
PV installer initially blamed resource variability.
Upon user insistence, inspection showed a blown circuit in resulting in 50%
reduction of production.
Problem started
Preliminary Results – Overall Energy Use:
-500
0
500
1,000
1,500
2,000
Jan
-11
Feb
-11
Mar
-11
Ap
r-1
1
May
-11
Jun
-11
Jul-
11
Au
g-1
1
Sep
-11
Oct
-11
No
v-1
1
Dec
-11
Ene
rgy
Use
(kW
h)
Months
Utility Energy Use Building Energy Use PV Poduction
OVERALL ENERGY USE - 2011:
1,916
11,288
9,372
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000En
erg
y U
se (
kWh
)
2011 Energy Use Totals
Utility Energy Use Building Energy Use PV Poduction
ENERGY USE INTENSITY (EUI) - 2011:
2.8
16.5
13.7
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0En
erg
y U
se In
ten
sity
(kB
tu/f
t2/y
r)
2011 Energy Use Intensity
Utility Energy Use Building Energy Use PV Poduction
PRELIMINARY RESULTS: energy + cost
HISTORY
ENERGY END USES - 2011:
0
200
400
600
800
1,000
1,200
1,400
1,600
Jan
-11
Feb
-11
Mar
-11
Ap
r-1
1
May
-11
Jun
-11
Jul-
11
Au
g-1
1
Sep
-11
Oct
-11
No
v-1
1
De
c-1
1
Ene
rgy
Use
(kW
h)
Months
HVAC
Dryer
Oven
Kitchen WaterHeater
DHW
Lights /Plug Loads
ENERGY END USES EUI - 2011:
0.00
0.50
1.00
1.50
2.00
2.50
Jan
-11
Feb
-11
Mar
-11
Ap
r-1
1
May
-11
Jun
-11
Jul-
11
Au
g-1
1
Sep
-11
Oct
-11
No
v-1
1
Dec
-11
End
En
erg
y U
se In
ten
sity
(kB
tu/f
t2/y
r)
Months
HVAC
Dryer
Oven
Kitchen WaterHeater
DHW
Lights /Plug Loads
ENERGY END USES - 2011:
1,274, 11%
399, 4%
1,057, 10%
153, 1%
21, 0%
8,113, 74%
Total Energy End Uses (kWh)
Lights /Plug Loads
DHW
Kitchen WaterHeater
Oven
Dryer
HVAC
ENERGY END USES INTENSITY - 2011:
1.87, 11%
0.58, 4%
1.55, 10%
0.22, 1%
0.03, 0%
11.88, 74%
End Energy Use Intensity (kBtu/ft2)
Lights /PlugLoads
DHW
Kitchen WaterHeater
Oven
Dryer
HVAC
COOLING SEASON DEMAND:
Hottest Day - August 28 (Building Unoccupied)
20
30
40
50
60
70
80
90
100
110
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0:0
0
1:0
0
2:0
0
3:0
0
4:0
0
5:0
0
6:0
0
7:0
0
8:0
0
9:0
0
10
:00
11
:00
12
:00
13
:00
14
:00
15
:00
16
:00
17
:00
18
:00
19
:00
20
:00
21
:00
22
:00
23
:00
Tem
pe
ratu
re (
F)
Po
wer
Dem
and
(kW
)
Hour of Day
BuildingDemand
Utility EnergyUse
PV Production
AC USE
AmbientTemperature
20
30
40
50
60
70
80
90
100
110
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0:0
0
1:0
0
2:0
0
3:0
0
4:0
0
5:0
0
6:0
0
7:0
0
8:0
0
9:0
0
10
:00
11
:00
12
:00
13
:00
14
:00
15
:00
16
:00
17
:00
18
:00
19
:00
20
:00
21
:00
22
:00
23
:00
Tem
per
atu
re (
F)
Po
wer
Dem
and
(kW
)
Hour of Day
BuildingDemand
UtilityEnergy Use
PVProduction
AC USE
AmbientTemperature
COOLING SEASON DEMAND:
Hottest Occupied Day (August 2)
-30
-20
-10
0
10
20
30
40
50
60
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0:0
0
1:0
0
2:0
0
3:0
0
4:0
0
5:0
0
6:0
0
7:0
0
8:0
0
9:0
0
10
:00
11
:00
12
:00
13
:00
14
:00
15
:00
16
:00
17
:00
18
:00
19
:00
20
:00
21
:00
22
:00
23
:00
Tem
per
atu
re (
F)
Po
wer
Dem
and
(kW
)
Hour of Day
BuildingDemand
UtilityEnergy Use
PVProduction
AC USE
AmbientTemperature
HEATING SEASON DEMAND:
Coldest Day – February 2nd (Building Unoccupied)
-20
-10
0
10
20
30
40
50
60
70
80
90
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0:0
0
1:0
0
2:0
0
3:0
0
4:0
0
5:0
0
6:0
0
7:0
0
8:0
0
9:0
0
10
:00
11
:00
12
:00
13
:00
14
:00
15
:00
16
:00
17
:00
18
:00
19
:00
20
:00
21
:00
22
:00
23
:00
Tem
per
atu
re (
F)
Po
wer
Dem
and
(kW
)
Hour of Day
BuildingDemand
UtilityEnergyUsePVProductionAC USE
AmbientTemperature
HEATING SEASON DEMAND:
Coldest Occupied Day – November 27th
COMPARISON WITH RECS & REM RATE
MODEL: 1) Average EUI
based on
RECS 2005
data.
2) REM Rate
estimates
based on
design-stage
analysis
3) Actual EUI
based on
consumption
from 1/1/2011
through
12/31/2011
37.6
30.1
19.8
8.04
16.5
2.8
0
5
10
15
20
25
30
35
40
Average TXHome
Average TXHome (Mod.)
REM RateModel (Building
Energy Use)
REM RateModel (UtilityEnergy Use)
Hacienda HaHaEUI (BuildingEneryg Use)
Hacienda HaHaEUI (UtilityEnergy use)
Ener
gy U
sae
Inte
nsi
ty (
kBTU
/ft2
/yr)
Energy Use Intensity (kBTU/ft2/yr)
7,795
9,372
11.9
14.3
0
2
4
6
8
10
12
14
16
18
20
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
REM Rate estimates Actual Production
PV
Pro
du
ctio
n (
kBtu
/sq
ft)
PV
Pro
du
ctio
n (
kWh
)
PV PRODUCTION: ACTUAL vs. REM RATE
1) Estimated
system size
(for REM Rate
model):
2) Actual System
Size: 7.5
KW
DAYLIGHT LEVELS
0
10
20
30
40
50
60
70
80
90
100
1 3 5 7 9 11 13 15 17 19 21 23
Day
ligh
t Le
vels
(FC
)
Hour of Day
Average Day - January
0
10
20
30
40
50
60
70
80
90
100
1 3 5 7 9 11 13 15 17 19 21 23
Day
ligh
t Le
vels
(FC
)
Hours of Day
Average Day - March
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 101112131415161718192021222324
Day
ligh
t Le
vels
(FC
)
Hour of Day
Average Day - April
0
10
20
30
40
50
60
70
80
90
100
1 3 5 7 9 11 13 15 17 19 21 23
Day
ligh
t Le
vel (
FC)
Hours of Day
Average Day - May
0
10
20
30
40
50
60
70
80
90
1000
:00
1:0
0
2:0
0
3:0
0
4:0
0
5:0
0
6:0
0
7:0
0
8:0
0
9:0
0
10
:00
11
:00
12
:00
13
:00
14
:00
15
:00
16
:00
17
:00
18
:00
19
:00
20
:00
21
:00
22
:00
23
:00
Day
ligh
t Le
vels
(FC
)
Hours of Day
Fully Cloudy Day - Occupied - December 21
DAYLIGHT LEVELS
CONCLUSIONS
• ROLE OF MONITORING IN IDENTIFYING:
• maintenance issues
• potential for performance improvement.
• OVERALL EVALUATION OF HOUSE ENERGY
PERFORMANCE.
• IMPACT OF IRREGULAR OCCUPANCY
• ACTUAL VS. MODELED ENERGY USE
THANK YOU,
Questions?