HVAC Building & Floor Cooling System Blanco 4m Telescope HVAC Building & Floor Cooling System E. Figueroa Oct. 01, 2010

Floor Cooling System 2” Dia. Pipe Building Cooling System 3” Dia. pipe Chiller 1 Chiller 2

2” Dia. Pipe 3” Dia. Pipe Chiller 2 10 T. R. Chiller 1 30 T. R.

4M Blanco Building Cooling Coil Schedule (BCS) UNIT CFM ENT. AIR TEMP. ° F LVG. AIR TEMP. ° F SENS. CAP TOTAL CAP. CHILLED GLYCOL   GPM PRESS N° OF REMARKS LOCATION STATUS N° D.B. W.B. BTU/HR ENT. TEMP. LVG.TEMP DROP H2O ROWS ROOM N° C-1 300 90.0 72.0 56.0 54.5 8,450 16,200 45°F 7.22°C 3.0 12.8 4 TRANE HIGH CAPACITY "C" COIL OR EQUAL 117 Vestibule(visitors access) WORKING C-2 180 83.1 66.1 5 6,420 54.4°F 12.44°C 1.5 4.3 109 Elevator N° 1 C-3 160 83.0 3,600 5,540 57.1°F 13.94°C 1.0 3.4 114 Computer room C-3A UNKNOWN Computer room 114 GORUND FLOOR C-4 350 76.5 61.9 51.0 49.4 7,100 11,400 53.3°F 11.83°C 15.3 106-108 Console Room C-5 600 83.2 66.4 13,500 21,000 56.5°F 4.0 4.9 3 116 Nights lounge Main access C-6 13.61°C Visitors Room C-7 83.3 6,800 10,700 52.8°F 11.55°C 213 Storage Plate NOT WORKING C-8 4,050 205 N. Assits Office C-9 209 Observers Office C-10 7,850 12,350 58.5°F 2.0 7.9 208 2ND FLOOR C-11 650 74.8 61.2 12,800 20,000 53.5°F 11.94°C 5.0 6.4 210 Laboratory (Ex Elect Lab.) C-12 55.4°F 13°C 9.1 211 Laboratory (Ex Elect Lab) C-13 306 Pump Relay NOT INSTALLED C-14 3100 73.4 60.2 57,600 86,000 20.0 10.0 8 TRANE 18"X 25", SERIES 18 IV / TURBULATORS 400.00 Hammerhead PUMP RELAY C-15 76.3 62.3 12,600 20,350 56.1°F 13.38°C 2 515 Main Floor C-16 73.5 5,600 8,300 54.1°F 12.27°C 8.0 506 DARK ROOM 2 MAIN FLOOR C-17 504 DARK ROOM 1 C-18 605 STAIR C-19 603 Dark Room 4 REMOVED C-20 602 Dark Room 3 C-21 450 76.9 62.9 9,650 15,900 53.7°F 12.05°C MEZZANINE BTU 339,790 106,630 Ton 28.32 8.89 Kilowatt-hour 99.587 31.251

44M BLANCO TELESCOPE FLOOR COIL SCHEDULE LOCATION AREA GPM REMARKS   N° SQ.FT 1 MAIN FLR 250 2.2 Between piers 3 & 4 (outside) East Side Stair Working 2 155 1.4 Between piers 3 & 4 (Inside) East Side Stair 3 50 5.0 Between pier 1 & 3 (inside) East side Not working or not connected 5 4 100 1.0 Between Pier 1 & 10 (inside) 90 0.9 Between piers 4 & 5 (inside) East Side Stair 6 195 1.7 Between pier 5 & 6 center after hatch 7 45 0.5 Hatch 8 9 140 1.2 Removed from Hatch (out of service) 4.1 10 11 12 13 Between pier 6 & 7(inside) west side 14 Between pier 6 & 7 (inside) 15 215 1.9 Between pier 6 & 7 (center) working 16 280 2.5 Between pier 6 & 7 (outside) 17 80 0.7 Between piers 5 & 6 (outside near pier 6 18 Between piers 5 & 6 (outside center) 19 1.8 Between piers 5 & 6 (outside near pier 5) 20 Between piers 4 & 5 (outside) East Side Visitors Gallery 21 Between piers 4 & 5 (center) East Side Visitors Gallery E NA Between pier 1 & 2 inside H COUDE Between pier 1 & 2 inside J COUDE Between pier 1 & 2 center K COUDE Between pier 1 & 2 outside L COUDE Between pier 7 & 8 center M COUDE Between pier 7 & 8 outside N COUDE Between pier 8 & 9 center O COUDE Between pier 8 & 9 inside P COUDE Between pier 8 & 9 outside 22 CONSOLE FLR 235 2.1 Between pier 2 & 3 (South side) 23 Between pier 2 & 3 (center side) 24 95 0.8 Between pier 1 & 2 (North Side) 25 between pier 10 & 1 (North side) 26 210 Between pier 9 & 10 (Rigth Side near 10) 27 Between pier 9 & 10 inside All floor working 28 85 Between pier 9 & 10 center side 29 220 Between pier 9 & 10 outside 30 300 2.7 Between pier 98& 9 center side 31 320 2.8 Between pier 8 & 9 outside 32 230 2.0 Between pier 7 & 8 inside 33 265 2.3 Between pier 7 & 8 outside A Hammerhead FLR Center B C Future installation D F Between Pier 8 & 10 G Gpm 50.4 17.4

Current Thermal Load Building Cooling System (BCS) Capacity 30 T. R. In use ~ 24 TON REF Available ~ 6 TON REF Floor Cooling System (FCS) Capacity 10 T. R. In use on floor ~ (65.5%) 6.5 TON REF In use in oil cooling ?? Available~ ?? Total for both systems in use ~ 31.5 TON REF

Thermal Requirements Future Demands 47.34 KW 13.46 TON REF 32.61 KW 9.27 TON REF 35.17 KW 10.00 TON REF 115.11 KW 32.73 TON REF ?? NEWFIRM & DECam Operation Clean Room and DECAM Computer & Console Room Sub Total Mirror cooling system Total Current & Future demands ~ 65.00 TON REF

Proposal to the Blanco 4m cooling capacity Replace the 10 TON REF FCS unit by a 40 or 50 TON REF unit (depending on the pipe diameter to be used to reduce glycol pressure drop and high travel velocity in the glycol system Replace the 2” Dia. Pipe of current 10 TON REF circuit to allow larger cooling capacity unit (TBD) Leave the new system only for FCS and telescope instrumentation Replace the 30 TON REF analog control system for a new digital control unit Leave the Console & Comp. Room cooling units in BCS circuit