Replacement High School
Undisclosed Location | Maryland
Alternate Mechanical System
Mechanical System Redesign
Solar Energy Conversion System (SECS)
Hybrid geothermal system w/ a cooling tower to supplement for peak load conditions
Alternate Delivery Method
Structural Roof Redesign
Façade Prefabrication
To accommodate extra loads of the cooling tower
Brady Sheerin | Construction Option
Advisor: Dr. Chimay Anumba
Replacement High School | Maryland
Brady Sheerin | Construction
Project Background
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
• Southern Maryland below Washington DC
N
• General Information
• Project Participants
Analysis 1: Mechanical System
• Area: 254,878 GSF
• Height: 3 Stories @ 70’
Analysis 2: Solar Energy Conversion
INITIAL SITE LAYOUT
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
• Cost: $74,250,000
• Dates of Construction: Dec. 2011 – Aug. 2013
• Delivery method: CM at Risk, Cost + Fee w/ GMP
• To replace the outdated existing school
PROGRESS PHOTO
Replacement High School | Maryland
Brady Sheerin | Construction
Project Background
Presentation Outline:
Project Background
• General Information
• Project Participants
Analysis 1: Mechanical System
: Prince George’s County Public School (PGCPS)
: HESS Construction + Engineering Services
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
: WMCRP
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 1: Mechanical System
Presentation Outline:
Project Background
Analysis 1: Mechanical System
• Background
• Process
High upfront cost of the school correlated to a lot of
VE
• Results
Analysis 2: Solar Energy Conversion
System (SECS)
Geothermal system w/ 400 wells all at a depth of 400’
@ $6,500/Well
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Hybrid Geothermal system
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Analysis 1: Mechanical System
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
• Background
• Process
• Results
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Takeoffs
#
Zone Name
101
102
103
104
105
106
Gym
Cafeteria
Kitchen
Classrooms
Classrooms
Lecture Hall
Building
Pieces
I-A,B
II-C
III-C
III-D
IV-E
N/A
Centrla Core
107 Transition & Atrium
108 Admin
V-B,F
109 Auditorium V1-G
Floor (sf)
37700
19355
10343
20657
15980
2815
N
E
S
W
Flat
Roof
4972
4973
10455
9360
-
6537
1227
5095
1814
2514
-
6076
13826
10826
7601
-
10608
1582
1583
3747
3747
2064
20593
12590
10343
20657
15980
2815
5746 1813
434
26638 3368 8973 1790
31176 7336 7475
-
1537 5746
22048
6271 7298
Roof
17033
9870
-
9291
7856
Height Occ
43.4
16
16
45.4
45.4
45.4
1397
127
1134
918
230
45.4
35
51
120
385
1587
# Extra Multi
Floors Story SF
2
2
41314
31960
2
11492
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 1: Mechanical System
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
• Background
• Process
• Results
Total Peak Heating Load: 275 tons
Total Peak Cooling Load: 738 tons
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Total Cooling Capacity Installed(Geothermal+Equipment)
Trace700 Building Cooling Load Profile
% Deviation
718.47
738
2.72
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
• Background
• Process
• Results
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Analysis 1: Mechanical System
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Replacement High School | Maryland
Analysis 1: Mechanical System
Brady Sheerin | Construction
Presentation Outline:
Brady Sheerin | Construction
Marley NC8407M-1 Steel Cooling Tower
Project Background
Analysis 1: Mechanical System
• Background
• Process
• Results
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
System
Fully Geothermal
Hybrid Geothermal
Cost of Wells
$2,840,500.00
$1,420,250.00
Cost of
Difference in Yearly
Difference in
Difference in
Cooling Tower
Running Costs
Maintenace Costs Structural Cost
$68,005.00
-
$5,846.70
$823.00
$4,896.60
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 1: Mechanical System
Presentation Outline:
Project Background
Analysis 1: Mechanical System
• Background
$1,347,348.40
• Process
• Results
Analysis 2: Solar Energy Conversion
System (SECS)
• Purchase custom casework
• Nicer Finishes
• Telecom Package
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Current geothermal system at the site is not the most practical
design should use a hybrid geothermal system.
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 2: SECS
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
To create a state-of-the-art educational facility
particularly in the field of science and technology
System (SECS)
• Background
• Process
• Results
To determine whether or not a photovoltaic array
would prove to be advantageous for the client
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Prove that a PV array would be a beneficial
investment for the owner.
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 2: SECS
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
7:00 am
2:00 pm
5:00 pm
2:00 pm
4:00 pm
10:00 am
Solar Shading on the Equinoxes
Analysis 2: Solar Energy Conversion
System (SECS)
• Background
• Process
8:00 am
• Results
10:00 am
Solar Shading on the Winter Solstice
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
6:00 am
10:00 am
2:00 pm
Solar Shading on the Summer Solstice
6:00 pm
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 2: SECS
9
12
15
18
30
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
• Background
• Process
• Results
Analysis 4: Façade Prefabrication
Acknowledgements
Brady Sheerin | Construction
Row Spacing Annual Energy System Performance
(ft)
(kWh)
Factor
Presentation Outline:
Conclusion
Replacement High School | Maryland
Shading Due to Parapet Wall
Shading Due to Modules
157116
197313
203286
205719
208048
58%
72%
75%
76%
76%
Replacement High School | Maryland
Analysis 2: SECS
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Replacement High School | Maryland
Brady Sheerin | Construction
With Row Spacing @ 15’
Roof Section
Item
Quantity
D
Module
Mounting Rack
Inverter
370
37
3
8/day/electrician
4/day/roofer
3/day/electrician
46.25
9.25
1
Module
Mounting Rack
Inverter
260
26
2
8/day/electrician
4/day/roofer
2/day/electrician
32.5
6.5
1
E
Output
Duration (days)
Direct Capital Costs
630
Module
5
Inverter
units
units
Balancing of System, equipment
Installation labor
Installer margin and overhead
• Background
• Process
• Results
Indirect Capital Costs
Permitting, Environmental Studies
Grid interconnection
Sales Tax
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
0.2 kWdc/unit
30 KkWac/unit
151.304
149.85
kWdc
kWac
$/Wdc
$/Wac
$310,173.20
$55,444.50
$/Wdc
0.43
$/Wdc
0.48
$/Wdc
0.81
Total Direct Cost
$65,060.72
$72,625.92
$122,556.24
$625,860.58
$/Wdc
0.23
$/Wdc
0.01
0%
Total Indirect Cost
$34,799.92
$1,513.04
$0.00
$36,312.96
Total Installed Cost:
Cost/Capacity:
$662,173.54
$4.38
2.05
0.37
Total Installed Cost
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Analysis 2: SECS
Brady Sheerin | Construction
Presentation Outline:
Project Background
Direct Capital Costs
Module
630
Inverter
5
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Provides 100% real tax exemption in Maryland
units
units
Balancing of System, equipment
Installation labor
Installer margin and overhead
• Background
• Process
30%
• Results
Analysis 4: Façade Prefabrication
25%
151.304
149.85
kWdc
kWac
2.05
0.37
$/Wdc
$/Wac
$310,173.20
$55,444.50
0.43
$/Wdc
0.48
$/Wdc
0.81
$/Wdc
Total Direct Cost
$65,060.72
$72,625.92
$122,556.24
$625,860.58
0.23
$/Wdc
0.01
$/Wdc
0%
Total Indirect Cost
$34,799.92
$1,513.04
$0.00
$36,312.96
Total Installed Cost:
Cost/Capacity:
$662,173.54
$4.38
Total Installed Cost
Conclusion
Acknowledgements
Indirect Capital Costs
Permitting, Environmental Studies
Grid interconnection
Sales Tax
0.2 kWdc/unit
30 KkWac/unit
$120 deescalating at 10% over a 10 year period
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 2: SECS
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Provides 100% real tax exemption in Maryland
• Background
• Process
30%
• Results
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
25%
$120 deescalating at 10% over a 10 year period
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 2: SECS
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
4.99 years
• Background
• Process
17 days given 4 roofers and 7 electricians
• Results
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Minimal: activities don’t occur on the critical path
PGCPS should consider implementing PV system based off of the
potential reduction in utility bills and the short payback period.
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 4: Façade Prefabrication
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
A two month delay on the notice-to-proceed reduced
an already tight schedule to 18 months
System (SECS)
Analysis 4: Façade Prefabrication
• Background
• Process
69,000 SF of hand laid ground-face-CMU on a metal
stud and masonry substrate.
• Results
Conclusion
Acknowledgements
Accelerate the schedule by utilizing a precast
architectural façade.
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Analysis 4: Façade Prefabrication
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Section D Facade
Section E Facade
Section C Facade
• Background
• Process
• Results
Conclusion
Acknowledgements
Section A & B Facade
: 342
Height < 13’6”
Section G Facade
Section F Facade
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
• Background
• Process
• Results
Conclusion
Acknowledgements
Analysis 4: Façade Prefabrication
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 4: Façade Prefabrication
Presentation Outline:
Project Background
Analysis 1: Mechanical System
: $2,233,500
: $35/SF
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
• Background
• Process
: $2,415,000
: $17,800
$22,700
• Results
: $2,410,100
Conclusion
Acknowledgements
: ($176,600)
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Analysis 4: Façade Prefabrication
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Section # of Panels
D
E
F
G
C
A&B
89
83
33
48
57
32
Avg. Time/Panel
24 min
24 min
24 min
24 min
24 min
24 min
Total Time (min)
2136
1992
792
1152
1368
768
Total Days Spent:
• Results
Conclusion
Acknowledgements
Section
D:
E:
F:
G:
C:
A&B:
Original Duration Adjusted Duration Reduction In Schedule
(8 Hr. Days)
(8 Hr. Days)
(8 Hr. Days)
60
46
19
32
41
27
4.45
4.15
1.65
2.4
2.85
1.6
Brady Sheerin | Construction
Total Time (Work Days)
• Background
• Process
Replacement High School | Maryland
55.55
41.85
17.35
29.6
38.15
25.4
4.45
4.15
1.65
2.4
2.85
1.6
17.1
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
• Background
• Process
• Results
Conclusion
Acknowledgements
Analysis 4: Façade Prefabrication
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Analysis 4: Façade Prefabrication
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
$176,600 More expensive (8% more)
Analysis 4: Façade Prefabrication
• Background
Greatly reduces installation time which allows other trades to start sooner
• Process
• Results
Conclusion
Acknowledgements
Reduction of the critical path by 6 weeks
Hess Construction should consider switching the installation method of the
facade. Ultimately this decision lies with the design team.
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Replacement High School | Maryland
Conclusions
Brady Sheerin | Construction
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
• Reduce first cost of system
• More efficient system
• Payback period validates change
Implement
System (SECS)
Analysis 3: Alternate Delivery Method
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
•
•
•
•
Minimal to no impact on schedule
Short payback period
Reduction in utility bills
Minimal maintenance and repairs
Implement
• 6 week reduction in schedule
• 8% more expensive
• Safer site
Implement
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
Acknowledgements
Dr. Chimay Anumba
Dr. Jeffrey Brownson
Prof. Moses Ling
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Justin Peak and Charlie Ravenna of Hess Construction + Engineering Services
Carl Wehmueller of Cummins-Wagner
Melanie Fonner, AE Undergraduate
Angie Veintimilla, AE Undergraduate
Michael Palmer, AE Undergraduate
Replacement High School | Maryland
Brady Sheerin | Construction
Replacement High School | Maryland
Brady Sheerin | Construction
Presentation Outline:
Project Background
Analysis 1: Mechanical System
Analysis 2: Solar Energy Conversion
System (SECS)
Analysis 4: Façade Prefabrication
Conclusion
Acknowledgements
Questions?
Replacement High School | Maryland
Brady Sheerin | Construction