Ray & Joan Kroc Corps Community Center
Mathias Kehoe | Mechanical Option
April 09, 2012
Outline
Introduction
DOAS
GSHP
Electrical Breadth
Summary
Ray & Joan Kroc Corps Community Center
•
•
•
•
•
Owned by Salvation Army
Located in Salem, Oregon
92,000 SF
$33 Million
Building Contains: Two Pools,
Gymnasium, Fitness Center, 288 Seat
Chapel, Rock Wall, Kitchen,
Community Rooms, Classrooms
Existing Mechanical System
Proposed Changes
Goals
• 10 RTUs with DX cooling and natural
gas furnaces
• Use Dedicated Outdoor Air System to
provide ventilation
• Reduce or Eliminate Natural Gas
Usage in the Building
• 2 AHUs with DX cooling and hot water
from boilers
• Use Ground Source Heat Pumps to
provide heating and cooling
• Reduce Energy Consumption
• Three boilers supply hot water to pools
and AHUs
• Use Energy Recovery techniques to
lower pool heating cost
• Reduce Utility Rates
Outline
Introduction
DOAS
GSHP
Electrical Breadth
Summary
Benefits of DOAS
• Use Energy Recovery Wheel to capture
heat from exhaust air
ERV 2
ERV 1
• Supply air at room neutral temperatures to
further reduce load
• Provide more accurate ventilation rates for
improved air quality
ERV 3
Ventilation
Exhaust
• Existing system is over ventilated, does not
provide accurate ventilation to each room.
• Designed to meet ASHRAE Standard 62.1
• Designed
Total pressurization
to meet ASHRAE
determined
Standard
by
62.1
2
20-50 CFM per window orERV
door
• Designed to meet ASHRAE Standard 62.1
• Exhausted Gymnasium, Aerobics Room,
and Fitness Area
ERV 1
ERV 3
• Exhausted
Gymnasium,
Aerobics Room,
• Pools
and Fitness
exhausted
Area to keep negatively
pressurized
• Heavily concentrated on north and central
parts of the building
• Heavily concentrated on south end of
building
• Heavily concentrated on south end of
building
Ventilation & Exhaust Summary
Equipment
ERV 1
ERV 2
ERV 3
Ventilation
5740
5970
6775
Exhaust
3410
4920
3765
Pressurization
Exhaust
Outline
Introduction
DOAS
GSHP
Electrical Breadth
Summary
Benefits of GSHP
• Provide consistent heating and cooling the
entire year
ERV 2
ERV 1
• Low cost of operation, no natural gas usage
• Long service life
ERV 3
Load Calculations
• Previous Trace model needed updated
• Using 8 Heat Pumps to provide heating
and cooling
• AHUs and Outdoor Air Units are on the
ground loop as well
Heating and Cooling Loads
HP 1
HP 2
HP 3
HP 4
HP 5
HP 6
HP 7
HP 8
ERV 1
ERV 2
ERV 3
AHU 1
AHU 2
Cooling
253
135
289
143
295
270
80
68
57
95
60
423
192
Heating
59
29
75
43
85
63
26
46
112
131
129
182
195
Totals
2360
1175
Site Layout
• Calculated well field size using GLHE Pro
ERV 2
ERV 1
3 Length: 27,800 ft.
• Determined
TotalERV
Well
• Chose 96 – 300 ft wells.
Piping Layout
• Piping size determined using B&G
System Syzer Calculator
ERV 2
ERV 1
• Kept Friction Loss between 1 and 4 ft
per 100’ of pipe
• Reverse Return
ERV 3
Heat Pump Selections
• Max Rooftop Heat Pump size: 20 tons
ERV 2
• Max Heat Pump size: 25 tons
• Sized based on cooling load
ERV 1
ERV 3
Outline
Project:
Job No:
Location:
Minimum Bus Capacity (A):
Main O.C. Device (A):
Design Capacity (A)"
Electrical System Change
Box
Introduction
Old Demand (A)
DOAS 408
GSHP 324
322
Electrical 250
Breadth
Summary 393
HMA
HMB
HMC
HMD
HAE
LPD
AHU 1(MDC)
AHU 2(MDC)
RTU1 (MDC)
Building Feed
261
244.5
185.2
188
2496
New Demand (A)
300
241
231
365
402
252
0
0
0
1711
Total
Electrical Breadth
Panel Schedule
Panel HMB
Difference
108
83
91
-115
-9
9
244.5
185.2
188
785
Device
Amps
35
30
20
20
20
20
20
20
20
20
20
Pole
3
3
3
1
1
1
1
1
1
1
1
Lighting
(VA)
Voltage L-L (V):
Voltage L-N (V):
Type:
Short Circuit Rating (A):
Mounting:
Comments
3005
1789
340
1675
1500
Lighting Load:
Receptacle (First 10 KVA):
Receptacle (Remainder):
Largest Motor:
Remaining Motors:
Appliances:
Equipment:
Sub Fed Panl:
Project:
Job No:
Location:
Minimum Bus Capacity (A):
Main O.C. Device (A):
Design Capacity (A)"
480
277
3 PHASE, 4 WIRE
See one-line Diagram
Surface
None
• Determined equipment being removed
Rect. (VA)
M/LM/E/A/S
(VA)
6730
6730
6730
5730
5730
5730
Description
SFPB-N1.18 Supply Fan Pwr Box
SFPB-N1.19 Supply Fan Pwr Box
SPARE
Corridor, Teen, Adult LTG
Chapel, Sto, Offices, Ext LTG
Sto D102, Vest B106, B104
Site Lighting
Lobby B105
Building Sign
SPARE
SPARE
BUSSED SPACE
BUSSED SPACE
BUSSED SPACE
BUSSED SPACE
Ckt.
Ckt.
No. Phase No.
Description
1
A
2 RTU-R.3 Rooftop Unit
3
B
4 5
C
6 7
A
8 RTU-R.4 Rooftop Unit
9
B
10 11
C
12 13
A
14 OHP-R.1 Outdoor Heat Pump
15
B
16 17
C
18 19
A
20 OHP-R.2 Outdoor Heat Pump
21
B
22 23
C
24 25
A
26 SPARE
27
B
28 29
C
30 31
A
32 BUSSED SPACE
33
B
34 BUSSED SPACE
35
C
36 BUSSED SPACE
37
A
38 XFMR to Panel "LPB"
39
B
40 41
C
42 Demanded VA Phase A:
Demanded VA Phase B:
Demanded VA Phase C:
D.F.
Demand
1.25
10386
1.00
0
0.30
0
1.25
63319
1.00
88035
0.65
0
1.00
0
1.00
107538
M/LM/E/A/S
(VA)
16885
16885
16885
10795
10795
10795
3045
3045
3045
3045
3045
3045
Rect. (VA)
• Placed new equipment based on location
compared to panel boards
Connected VA Phase A:
Connected VA Phase B:
Connected VA Phase C:
Total:
Load (Amps):
SALEM KROC CENTER
2006129
Electrical B115
600
None
500
Panel Schedule
Panel HMB
• Calculated new panel board demand loads
to verify compatibility with existing panel
boards
85668
80478
80082
Connected
8309
0
0
50655
88035
0
0
107538
254537
306.2
269278
323.9
39438
34248
33852
89889
84699
84303
Demand Load (A) =
Spare Capacity (A) =
Lighting
(VA)
Pole
3
3
3
3
3
-
Device
Amps
70
50
15
15
15
-
3
-
225
-
324
176
Device
Amps
70
20
20
20
20
20
20
20
20
20
20
Pole
3
3
3
1
1
1
1
1
1
1
1
Lighting
(VA)
Rect. (VA)
M/LM/E/A/S
(VA)
13080
13080
13080
Voltage L-L (V):
Voltage L-N (V):
Type:
Short Circuit Rating (A):
Mounting:
Comments
Description
HP 3
SPARE
SPARE
Corridor, Teen, Adult LTG
Chapel, Sto, Offices, Ext LTG
Sto D102, Vest B106, B104
Site Lighting
Lobby B105
Building Sign
SPARE
SPARE
BUSSED SPACE
BUSSED SPACE
BUSSED SPACE
BUSSED SPACE
ERV 1
3005
1789
340
1675
1500
Connected VA Phase A:
Connected VA Phase B:
Connected VA Phase C:
Lighting Load:
Receptacle (First 10 KVA):
Receptacle (Remainder):
Largest Motor:
Remaining Motors:
Appliances:
Equipment:
Sub Fed Panl:
Total:
Load (Amps):
SALEM KROC CENTER
2006129
Electrical B115
400
None
400
63520
58330
57934
Connected
8309
0
0
39240
33006
0
0
107538
188093
226.2
480
277
3 PHASE, 4 WIRE
See one-line Diagram
Surface
None
Ckt.
Ckt.
No. Phase No.
Description
1
A
2 ERV 3
3
B
4 5
C
6 7
A
8 SPARE
9
B
10 11
C
12 13
A
14 SPARE
15
B
16 17
C
18 19
A
20 SPARE
21
B
22 23
C
24 25
A
26 SPARE
27
B
28 29
C
30 31
A
32 BUSSED SPACE
33
B
34 BUSSED SPACE
35
C
36 BUSSED SPACE
37
A
38 XFMR to Panel "LPB"
39
B
40 41
C
42 Demanded VA Phase A:
Demanded VA Phase B:
Demanded VA Phase C:
D.F.
Demand
1.25
10386
1.00
0
0.30
0
1.25
49051
1.00
33006
0.65
0
1.00
0
1.00
107538
ERV 2
M/LM/E/A/S
(VA)
11002
11002
11002
Rect. (VA)
ERV 3
199981
240.5
39438
34248
33852
66790
61600
61204
Demand Load (A) =
Spare Capacity (A) =
Lighting
(VA)
Pole
3
3
3
3
3
-
Device
Amps
60
20
15
15
15
-
3
-
225
-
241
159
Panel HMC Wire Cost Changes
Wire Size
#14
#12
#10
#8
#6
#4
#3
#2
#1
#1/0
#2/0
#3/0
#4/0
250
300
350
400
500
Subtractions
1950
305
Additions
155
620
225
240
550
275
2200
1100
Difference
0
-1950
-150
620
-225
-240
-550
0
0
275
0
-2200
0
0
1100
0
0
0
Price/Lin. Ft.
0.24
0.37
0.57
0.87
1.34
2.16
2.67
3.35
4.40
5.33
6.68
8.38
10.53
12.49
14.90
17.44
19.85
24.02
Total
Price Change
$
$
(716.76)
$
(85.20)
$
541.94
$
(302.59)
$
(517.80)
$
(1,470.69)
$
$
$
1,466.05
$
$ (18,443.85)
$
$
$
16,388.16
$
$
$
$
(3,140.75)
Wire Savings
Box
HMA
HMB
HMC
HMD
HAE
LPD
AHU 1(MDC)
AHU 2(MDC)
RTU1 (MDC)
Building Feed
Total
Price Difference
$
(30,940.88)
$
(10,959.59)
$
(3,140.75)
$
50.32
$
20.28
$
(55.14)
$
(10,625.73)
$
(4,239.29)
$
(17,713.96)
$
(8,762.07)
$
(86,366.81)
Wire Savings Calculation
• Old Equipment wire sizes were
ERV 2
listed in construction documents
ERV 1
ERV 3
• New Equipment wire sizes were
determined using NEC 2008
Additional
Outline
Costs
Introduction
System Cost Summary
DOAS Unit
Cost
Mechanical
$
(6,685.00)
GSHP
PlumbingBreadth$
191,786.00
Electrical
Electrical
$
(86,367.00)
Summary
Structural
$
94.00
Well Field
$
432,000.00
Total
$
530,828.00
Simple Payback
Energy Savings
January
February
March
April
May
June
July
August
September
October
November
December
Mechanical
Energy
System
Savings
Summary
Energy Costs by Month and Type
Equals
Additional
Costs divided
by
EC (kwh)
ED (kw)
Gas (therms)
EC ($)
ED ($)
91045
158
0
$
4,569 $
660
annual savings
83161
90291
86814
87493
84823
90464
89637
84044
86880
88553
93232
159
156
156
163
170
178
179
169
153
159
159
0
0
0
0
0
0
0
0
0
0
0
= $530,828 / $71,460
$
$
$
$
$
$
$
$
$
$
$
7.43 Years
Individual Costs:
Total Energy Cost:
$
$
4,203
4,534
4,372
4,404
4,280
4,542
4,503
4,244
4,376
4,453
4,670
$
$
$
$
$
$
$
$
$
$
$
53,150 $
61,454
$
$
$
$
$
$
$
$
$
$
$
$
Gas ($)
-
8,303 $
-
666
648
648
690
733
782
788
727
629
666
666
• Dedicated Outdoor
Air System
Annual Utility Cost
Building
Pool ERV 2
Existing
System Source
17,123.00 $
ERV$1 124,281.00
• Ground
Heat Pumps
ERV$3
New System
$
61,454.00 $
8,490.00 $
• Pool Energy Recovery
Total Savings
$
Total
141,404.00
69,944.00
71,460.00
Goals
• Reduce or Eliminate Natural Gas
Usage in the Building
• Reduce Energy Consumption
• Reduce Utility Rates
Results
• Natural Gas consumption dropped from
48,000 therms to under 6,600 therms. An
86% reduction
• Electricity consumption dropped 12.6%,
and peak demand dropped from 549kW to
179kW
• Utility rates were lowered by $71,460, a
fifty-one percent reduction
• All three goals were accomplished.
ERV 2
Results were better then expected.
ERV 1
ERV 3
• The proposed changes are an
excellent option at an affordable price
Acknowledgements
• Major Donna Ames & Salvation Army
ERV 2
• Keith Hayes & BRS Architecture
• Reese Engineering
– Sam Snyder
– Jarod Stanton
• Faculty and Staff
• Friends and Family
ERV 1
ERV 3
Questions and Comments
ERV 2
ERV 1
ERV 3