Included below: Notes from South Pole Tiger Team telecon on Tuesday July 18 1pm MDT, 2pm CDT, 3pm EDT Agenda for next Telecon Wednesday July 19, 10:30 MDT, 11:30 CDT, 12:30 EDT (877)322-9648 call in participant code 185238 Please review notes from July 18 telecon and especially summaries before July 18 telecon. This file is also posted on SCOARA web page: http://astro.uchicago.edu/scoara/2006-power/index.html -------------------------- Notes from July 18 telecon: Participants: John Carlstrom Bob Morse & Andy Laundrie B.K. Grant, Carlton Walker, Martin Lewis & Joe Crane Erick Chiang (listening) Vladimir Papitashvili Chris Martin George Blaisdell John Rand Dick Armstrong Steve Padin Scott Borg (listening) 1. Reviewed briefly South Pole overall power issues for upcoming 2007 Season. This is well captured by the executive summary of Armstrong report. 2. Reviewed charge to the committee (Confirmed by Erick Chiang) - Verify power requirements for winter 2007. (Use Armstrong report as basis and revalidate if needed.) - Living under 660 kW (700 kW) avg winter use. Develop options and identify associated challenges (Conservations, power shedding and power management) - Generating more power. Develop options and associated challenges (Generation and fuel storage and cargo) - Contingency planning if the fuel tanks are not left full at end of the season. 3. Reviewed and discussed Armstrong report on current and future projections - Accuracy of 2006 and 2007 projections. Can we verify projections? - Understanding the problem by dealing with known +/- increments to current useage. (Make list of known +/- increments for 2007. Here there was considerable discussion and fact finding: First concentrated on areas that Dick felt might need attention: - Logistics Facility? 20 kVa avg on winter 2007, line 14 This is the Cargo facilty of the SPSM and could be delayed and therefore removed in 2007 projections * SAVE 20 kVa 2007 projection, no increment to 2006 base - Rod well development? 39 kVa avg winter, line 31 Carlton reports that this can not be reduced (most power is in heat trace) Deemed to be essential for 2007. * Increment 39 kVa from 2006 - Fuel arch? 13 kVa avg winter (already this low) Deemed to be essential for 2007 - Elevated siding projection of 4.8 kVa avg winter should not be there. * SAVE 5 kVa 2007 projection, no increment to 2006 base - ICECUBE (page 44) appears to be correct, but DNF 15 kVa is double counted under Summercamp load on row 25 on page 40 and TOSS line 35 * SAVE 15 kVa avg in 2007 projection, no increment to actual 2006 * A/I BK/RPSC to check on ICECUBE double counting - MAPO/QUAD/AMANDA row 3 page 40; listed 42.4 kVa with 15 kVa for N2 plant. Is this correct? Morse reported new readings: Total building was 58.3 kW with N2 Plant 24 kW QUAD 7.2 kW Amanda 25 kW Machine shop 1 kW (this will be intermitent) So, appropriate number with N2 plant missing is 35 kW -> 39 kVa Small savings if any * SAVE 2 kVa avg in 2007 projection, no increment to 2006 - Operations lines 15-27 on page 40 The 2007 projections were based on measurements taking in March and April 2006 BEFORE many of conservation practices were put into effect. These should be checked and updated as appropriate * SAVE unknown, no increment to current 2006 base * A/I: RPSC to verify power projections on Operations line 15-27 on page 40 - Cryo facilty projections are not clear. SCOARA is preparing a report on possible power savings using lower duty cycle on N2 plant and judicious use of re-liquifiers through the winter. Assumptions below are reasonable guesses. * A/I Carlton and Floyd to revisit 2007 cryofacilty projection with * A/I new information on re-liquifiers and N2 plant below. o SCOARA cryo group reports that the three helium re-liquifiers use glycol chillers at 5 kW each. Using heat exhangers we can save 4 kW each * SAVE 12 kW avg in 2007 winter, * Increment -12 kW from current 2006 load o SCOARA reports re-liquifier compressors use 11.3 kVa each and can be phased out through the winter. Report assumes 3 ea at 24/7/365 We'll assume two running * SAVE 12.3 kVa avg in 2007 projection * Increment -12.3 kVa from current 2006 * A/I SCOARA to confirm re-liquifier useage through winter. o liquid nitrogen plant can use longer duty cycle We assume 50% duty cycle here Note Morse's reported measurement list 24 kVa not 15 kVa * SAVE 3 kVa avg in projection, since only 15 kVa was assumed. * Increment -12 kVa from 2006 * A/I SCOARA to confirm N2 plant duty cycle o Could we use more efficient nitrogen plant to save energy? * A/I SCOARA liquid cryogen working group is looking in to more efficient * A/I nitrogen plants, especially if used with lower duty cycle. 3. Reviewed feedback from current winterovers. See report by Denis Barkats on SCOARA tiger team web page. Report was very much appreciated. * A/I George B Blaisdell will send comments on winterover report. - Discussed conservations measures, electrical power and fuel o Refrigeration in Galley: - Can we take advantage of the cold site, i.e., use outside glycol loop - Can we use only one walk in refrigerator in winter? * A/I Carlton to investigate heat exchanger to cool refrigerators * A/I B.K. to determine power requirement of refrigerators * SAVE Unknown * Increment - same as SAVE o Can we make use of more efficient hot plate in galley? Current minimum is 5kW. o Lights - Armstrong report indicates savings of 7.5 kVa with efficient electronic ballasts with very little cost. * SAVE up to 12.6 kW from 2007 projections * Increment as much as -12.6 kW from current * A/I Vladimir: understand EMI issue and make decision on lights o New station uses boilers to supplement heat if heat exchangers are insufficient to cover it. This uses fuel but not electrical generation. How much can be gained in fuel if sealed up better? * A/I RPSC - do we have fuel impact of better station weather barrier? o MAPO and Liquid Nitrogen Plant Issues: First floor of MAPO needs the liquid nitrogen plant to keep above freezing. If nitrogen plant moves to cryo facilty, then MAPO may perhaps need a bigger boiler, but definitely needs to be better sealed up and its HVAC upgraged. An inspection of MAPO revealed four main problems with cold leakage: 1. Viper hallway - could be sealed up at shop door. This would require moving storage cabinets into MAPO. 2. Backdoor leaks (snow blows in !) 3. QUaD hallway is very lossy (Winterove put foam on the floor) 4. DASI compressor room heated by cold hallway link to main building. Overall MAPO HVAC system needs a maintenance, also sealing up worn out seals, etc. AMANDA lab cools by drawing cold air through heated QUAD office area. Winterovers don't like the idea of transporting N2; already hard to transport liquid helium. USERS strongly prefer to keep nitrogen plant in MAPO. * A/I Carlton is planning to inspect and better seal up MAPO - fuel savings? ------------------------------------------------ SUMMARY of SAVEs identified in 2007 projection: * SAVE 20 kVa 2007 projection, no increment to 2006 base * SAVE 5 kVa 2007 projection, no increment to 2006 base * SAVE 15 kVa avg in 2007 projection, no increment to actual 2006 * SAVE 2 kVa avg in 2007 projection, no increment to 2006 * SAVE unknown, no increment to current 2006 base * SAVE 12 kW avg in 2007 winter, * SAVE 12.3 kVa avg in 2007 projection * SAVE 3 kVa avg in projection, since only 15 kVa was assumed. * SAVE Unknown * SAVE up to 12.6 kW from 2007 projections TOTAL SAVINGS: 85 kVa (rough) to 2007 avg winter project, page 40. Subtracting this from projected 2007 avg load on page 40 gives 860 kVa - 85 kVa = 775 kVa -> 697 kW. This is encouraging in that it is within reach of the power generation and fuel storage capabilities of NPP. Next we turn to projections based on increments to current 2006 useage: ------------------------------------------------------------ SUMMARY of Increments to 2006 to project 2007 avg winter use: * Increment 39 kVa from 2006 * Increment -12 kW from current 2006 load * Increment -12.3 kVa from current 2006 * Increment -12 kVa from 2006 * Increment - same as SAVE * Increment as much as -12.6 kW from current Subtotal: - 11.2 kVa avg Include * Increment 73 kW SPT * Increment 20 kW ICECUBE * Increment unknown for Cryo facility lights, blng, etc. Subtotal + 103 kVa TOTAL 2007 winter avg increment to current load: + 92 kVa, or 83 kW This is very encouraging since current avg loads are about 580 kW. Projecting by incrementing the current loads gives total avg load of 663 kW which is well within range of the current power generation and fuel storage capacity. It is also very encouraging that our two methods - straight projections, and increments to current useage agree fairly well. Note, however, that there is no contingency here and some numbers are still uncertain - we don't fully understand the current useage, just the bottom line. In the next telecon we will start by reviewing the above number and action items, and then move on to the rest of our charge. Agenda after the A/I summary. ------------------------ SUMMARY of Action Items: * A/I BK/RPSC to check on ICECUBE double counting * A/I: RPSC to verify power projections on Operations line 15-27 on page 40 * A/I Carlton and Floyd to revisit 2007 cryofacilty projection with * A/I new information on re-liquifiers and N2 plant below. * A/I SCOARA to confirm re-liquifier useage through winter. * A/I SCOARA to confirm N2 plant duty cycle * A/I SCOARA liquid cryogen working group is looking in to more efficient * A/I nitrogen plants, especially if used with lower duty cycle. * A/I George B Blaisdell will send comments on winterover report. * A/I Carlton to investigate heat exchanger to cool refrigerators * A/I B.K. to determine power requirement of refrigerators * A/I Vladimir: understand EMI issue and make decision on lights * A/I RPSC - do we have fuel impact of better station weather barrier? * A/I Carlton is planning to inspect and better seal up MAPO - fuel savings? ------------------------------------------------------------------- Remaining agenda items: 4. Develop options/suggestions for power conservation. What would it take to meet power demands with SPT and ICECUBE deployed? 5. Develop options/suggestions for generating more power. Run peaking generator / Add stand alone generator? - Fuel requirements - Effort to maintain a stand alone unit (staffing) - Transportation of fuel and storage? ----------------------------------- Further information for committee: ----------------------------------- Comparison of NPP design to 2007 projection: | |kW | | |Armstrong Report | | |Ave Running Loads | 750 kW Only |FY07 Forecast | | |Summer |Winter |Summer |Winter |Summer |Winter | |Science |201 |219 |279 |363 |316 |330 | |Ops |340 |303 |384 |300 |431 |394 | |Other | | | | |46 |49 | | | | | | | | | |TOTAL |541 |522 |663 |663 |793 |773 | | |Text Prior to Table|Text Prior to Table|Tables on pgs 38 | | |on Page 11 |on Page 11 |and 41 | Relevant Action Items from NSF/RPSC/ICECUBE/SPT July 5-6 meeting: A/I - RPSC to verify lead times for surface fuel tank procurement. Owner: Carlton Walker. Date Due: 7/20/06 Update 7/12/06: Recent vendor contact for large capacity tanks for MCM indicated delivery of 5 to 7 weeks from date of approved drawings. A/I - RPSC will determine if an environmental evaluation to store additional fuel is needed. Owner: Bk Grant Date Due: 7/12/06. Update 7/12/06: Email back from RPSC EH&S stating, RPSC should feel comfortable to go forward and evaluate options for what is needed for fuel storage. Keep EH&S involved for input to ensure fuel storage includes secondary containment and other Environmental controls. RPSC EH&S has left a voicemail for Polly Penhale at NSF on this issue and is awaiting a response. --------------------------------------- Issues raised on SCOARA weekly telecon: --------------------------------------- Do we understand why the power useage was much lower after power outage? ---------------------------------- Load Shedding numbers from report: ---------------------------------- Sauna: 15 kW few hrs/day? Growth chamber 17 kW 17 hrs/day? Computer lab sections 4 kW Laundry room 10 kW summer camp only Quiet reading room 0.5 kW already in effect? Gym AHU, lights 3.5 kW few hrs/day? MAPO machine shop 10 kW based on what? Usually not used? N2 production 15 kW (lower duty cycle) --------------- Useful numbers: --------------- 1 kw/year == 644 gallons; 13.6 kw hours == 1 gallon 1 gallon fuel =~ 1 gallon liquid nitrogen for current N2 plant 100 kW year == 65,000 gal JP8 == 17 flights for fuel transport with 26,000 lb ACL 1 gallon JP8 == 6.5 lbs, $10-$15 per gallon delivered std fuel arch tank holds 10,000 gallons $1 per kw hour at South Pole.