Exhibit U - SCSU Chilled Water Study Report - St. Cloud State ...

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6. Administrative Services Building Supply and return water temperatures appear to track well, indicating that the return water temperature control valve is functioning as intended. This graph also indicates that night and weekend setback scheduling is consistent and somewhat coincidental with building occupancy. GRAPH 4 70 Administrative Building — September 1, 2011 CHW Supply and Return Temperatures 65 CHW Temperature (°F) 60 55 50 45 Supply Temp, °F Return Temp, °F 40 7:12 PM 12:00 AM 4:48 AM 9:36 AM 2:24 PM 7:12 PM 12:00 AM Cooling System Performance • Graphs 2, 3, and 4 above indicate that the building load commences around 3:00 AM and maintains the desired setpoint until 5:00 PM Monday through Friday with weekend shutdowns. It appears that pre-cooling occurs until approximately 7:00 AM when occupancy may begin. • This data is consistent with the operating schedule established for the building and does appear to be coincidental with the AHU operating schedule. 27
6. Administrative Services Building Building Impact on <strong>Chilled</strong> <strong>Water</strong> System • The two-way valves on the AHUs are performing properly and are not having a negative impact on the chilled water distribution system. • The return water temperature control valve is intended to restrict return water flow to the chilled water plant until it reaches a predetermined temperature. There is no cross-connect to the supply water line and no booster pump to move the water if there were. This valve is redundant to and, in some cases, overrides the performance of the individual AHU control valves. Recommendations • Command open the return water temperature control valve and remove its control parameters. • Properly tune individual AHU control valves. • Install BTU chilled water meter in ground floor mechanical room. • Balance water flow to AHUs. • Document new performance data. 28
Page 1 and 2: St. Cloud State University Chilled
Page 3 and 4: 1. Executive Summary
Page 5 and 6: 1. Executive Summary Conclusion McK
Page 7 and 8: 1. Executive Summary RIVERVIEW •
Page 9 and 10: 2. Chilled Water System
Page 11 and 12: 2. Chilled Water System Graphs 2, 3
Page 13 and 14: 2. Chilled Water System GRAPH 4 PSI
Page 15 and 16: 3. Chilled Water Plant
Page 17 and 18: 3. Chilled Water Plant Chilled Wate
Page 19 and 20: 3. Chilled Water Plant A similar pa
Page 21 and 22: 4. Distribution Loop Distribution L
Page 23 and 24: 4. Distribution Loop TABLE 4 Bldg E
Page 25 and 26: 4. Distribution Loop Design GPM Cur
Page 27 and 28: Building 51 (Business Building) Yea
Page 29 and 30: 5. 51 (Business) Building General B
Page 31 and 32: 5. 51 (Business) Building 70 GRAPH
Page 33 and 34: 6. Administrative Services
Page 35 and 36: 6. Administrative Services Building
Page 37: 6. Administrative Services Building
Page 41 and 42: Atwood Memorial Center Year Built 1
Page 43 and 44: 7. Atwood Memorial Center General B
Page 45 and 46: 7. Atwood Memorial Center GRAPH 4 7
Page 47 and 48: 8. Brown Hall
Page 49 and 50: 8. Brown Hall 34
Page 51 and 52: 8. Brown Hall Chilled Water Energy
Page 53 and 54: 8. Brown Hall Recommendations • C
Page 55 and 56: Centennial Hall Year Built 1971 Ren
Page 57 and 58: 9. Centennial Hall General Building
Page 59 and 60: 9. Centennial Hall GRAPH 3 70 Cente
Page 61 and 62: 9. Centennial Hall Recommendations
Page 63 and 64: Education Building Year Built 1971
Page 65 and 66: 10. Education Building General Buil
Page 67 and 68: 10. Education Building GRAPH 3 CHW
Page 69 and 70: 11. Engineering & Comp. Center
Page 71 and 72: 11. Engineering & Computer Center 5
Page 73 and 74: 11. Engineering & Computer Center G
Page 75 and 76: 11. Engineering & Computer Center C
Page 77 and 78: Garvey Commons Year Built 1962 Reno
Page 79 and 80: 12. Garvey Commons General Building
Page 81 and 82: 12. Garvey Commons GRAPH 4 CHW Temp
Page 83 and 84: 13. Kiehle Visual Arts Center
Page 85 and 86: 13. Kiehle Visual Arts Center 60
Page 87 and 88: 13. Kiehle Visual Arts Center Chill
Page 89 and 90:
13. Kiehle Visual Arts Center 70 GR
Page 91 and 92:
14. Lawrence Hall
Page 93 and 94:
14. Lawrence Hall 66
Page 95 and 96:
14. Lawrence Hall Chilled Water Ene
Page 97 and 98:
14. Lawrence Hall Cooling System Pe
Page 99 and 100:
Miller Learning Resource Center Yea
Page 101 and 102:
15. Miller Learning Resources Cente
Page 103 and 104:
15. Miller Learning Resources Cente
Page 105 and 106:
Performing Arts Center Year Built 1
Page 107 and 108:
16. Performing Arts Center General
Page 109 and 110:
16. Performing Arts Center GRAPH 4
Page 111 and 112:
Riverview Year Built 1911 Renovatio
Page 113 and 114:
17. Riverview General Building Desc
Page 115 and 116:
17. Riverview GRAPH 4 CHW Temperatu
Page 117 and 118:
Stewart Hall Year Built 1948 Renova
Page 119 and 120:
18. Stewart Hall General Building D
Page 121 and 122:
18. Stewart Hall GRAPH 3 70 Stewart
Page 123 and 124:
19. Student Rec Center
Page 125 and 126:
19. Student Recreation Center 88
Page 127 and 128:
19. Student Recreation Center GRAPH
Page 129 and 130:
20. Wick Science Building
Page 131 and 132:
20. Wick Science Building 92
Page 133 and 134:
20. Wick Science Building GRAPH 2 3
Page 135 and 136:
20. Wick Science Building Cooling S
Page 137 and 138:
Wick Science Building Addition Year
Page 139 and 140:
21. Wick Addition General Building
Page 141:
21. Wick Addition GRAPH 4 CHW Tempe
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Exhibit U - SCSU Chilled Water Study Report - St. Cloud State ...

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