Included below: Notes from 2nd South Pole Tiger Team telecon on Tuesday July 19 10:30am MDT, 11:30am CDT, 12:30pm EDT Agenda for third Telecon Friday July 21, 10:00am MDT, 11:00am CDT, 12:00pm EDT (877)807-5706 PARTICIPANT CODE: 857292 Please review notes and summary from July 19 telecon below. Agenda for Friday telecon follows the notes. This file is also posted on SCOARA web page: http://astro.uchicago.edu/scoara/2006-power/index.html -------------------------- Notes from July 19 telecon: Participants: - John Carlstrom - Bob Morse & Andy Laundrie - B.K. Grant, Carlton Walker, Martin Lewis, Dave Scheuerman & Joe Crane - Erick Chiang - Vladimir Papitashvili - Chris Martin - George Blaisdell - John Rand - Dick Armstrong - Steve Padin - Scott Borg (listening) - Jerry Marty - Jack Lightbody (observer) - Sandy Singer ------------------------------------------------ Reviewed savings in 2007 avg projections tabulated from previous telecon: 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. ------------------------------------------------- Reviewed bottom up approach by considering increments to current 2006 useage needed for 2007 and added to base. TOTAL for 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. ------------------------------------------------------- 7/19/06 telecon discussion on these findings: Warnings: - we are currently at a low useage time. the transition periods at the beginning and end of the winter season will have higher loads. Certainly this has historically been the case. - There is no contingency in the above calculations. - The incremental number should include blng loads for cryofacilty. * A/I John to estimate new cryo loads starting from Carlton's numbers. QUESTION: - Are the DNF needs fully accounted for? * A/I BF/RPSC check to see full needs for DNF and its power requirements * A/I are accounted for. -------------------------------------------------------- SUMMARY of Action Items from telecon #1 July 18. * A/I ******************* * A/I BK/RPSC to check on ICECUBE double counting of DNF DONE Morse's number were double counted at 15kVa as noted above They are actually included in Rodwell and Toss lines page 40 * A/I: RPSC to verify power projections on Operations lines 15-27 on page 40 Update - in progress * A/I Carlton and Floyd to revisit 2007 cryofacilty projection with * A/I new information on re-liquifiers and N2 plant below. DONE - The table 65 Kva, that assumed 15 kVa for N2 plant + 3 re-liquidfiers + chiller and buiding. (note N2 is 24 kVa) * 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 Blaisdell will send comments on winterover report. * A/I Carlton to investigate heat exchangers to cool refrigerators Update: two refrigerators already use cooling loop. Freezer uses compressor, uses about 2.5 kW. * A/I B.K. to determine power requirement of refrigerators DONE * 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? * A/I ************************ Tackled next part of our charge: Develop options/suggestions for power conservation. What would it take to meet power demands with SPT and ICECUBE deployed? ------------------------------------------------------ Based on the above estimates, we assume we need to save an additional ~50kW to 100 kW to safely proceed with deployments. Can these savings be found? o Shut down some science experiments - provide some sort of power budget for science program manager and let him decide what science to operate or shut down? He would need to account for full power associated with each science project - e.g., power with liquid helium is associated with QUaD and BICEP. Keep track of overhead, i.e., people deployed, etc. After SPT and ICECUBE, and perhaps Amanda and the liquid helium, no science projects stand out as major users. If we are trying to find savings to allow ICECUBE and SPT to deploy and operate, it appears only minor saving can be found by shutting down other science. It would not be sufficient and would be a high price to pay. o Remember each person add 2kW-hr/person/day - what population is required? o Can we save by phasing projects? Managing power on site? For science this can only be done by doing less science. By phasing things like sauna, growth chamber, we cut down peak but not avg power. o Can we house people in only A1 and put B1 in survival mode? B1 has the lounges and emergency stuff. Can not "shut it down" completely. We could cut living space. But would keep the Galley, lounge, reading room.... * A/I BK/RPSC will put together a plan for maximum power * A/I saving by putting much of a pod in survival mode. * A/I We need to know possible savings to 2007 projection, and * A/I also corresponding increment to current 2006 useage. o Savings in DNF left? Carlton feels that it is consolidated and piled up here and there. o Vehicles have engine heaters. We could trade running engines to save on electrical power, but that requires fuel. As we see below, the real issue is in fact fuel storage. Hypothetical question asked to the group: "What extreme measures would be done if we found ourselves 50 to 100 kW over at beginning of winter season? What would be cut? How would we cope? (question was a conversation stopper) o No further cuts were identified. Only reasonable answer was that we must have monitors/meters in place to answer this question, to know what we really have, what could be taken down with least pain and most gain. o In such a crisis in the summer, the short term sol'n is to use external generators. We are left with the situation that deploying ICECUBE and SPT leaves us right at the margin of expected avg winter power generation, i.e, optimistically at 700 kW avg with no contingency included, and still some uncertain numbers. -------------------------------------------------------------------- On to next part of our charge: 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? A strawman plan was proposed to allow 50 to 100 kW avg winter power in 2007 to be generated by the NPP using the peaking generator and by increasing the fuel storage. It would be a construction job and would require new surface fuel storage. Ideally any procurements could be used for long term power upgrade. It was noted that new tanks could be manufactured in time and that the environmental assessment would likely allow temporary fuel tanks mounted on the surface (see Ohare July 5-6 meeting action items). With the peaking generator being used, the required 2007 power generation requirements becomes one of providing sufficient fuel on site. Rough numbers for fuel were estimated, approximately 25,000 gallons for additional 50 kW avg power generation through winter 2007. * A/I George to provide longterm power generation plots for entire winter * that he and Vladimir will put together. Could do this be done - A construction and cargo and procurement problem. What would it take? Could bladders be used temporarily for winter fuel storage (as in the past, and for field camps)? * A/I PRSS/Chiang to put together a full analysis for additional * A/I winter storage of fuel to allow contingency in power generation. * A/I Jerry to provide photos/info an tanks on berm Warning - For short and near term, the peaking generator is a possible sol'n, but maybe only possible through 2008. This is not long term sol'n. This committee is charged with bridging what is hopefully a short term problem. Longer term planning is underway and beyond charge of this committee. ------------------------------------------------------------ As for power generation, we must also consider the fuel conservation. There are two general areas: 1) Better power generation efficiency. This is being worked on. Issues are spelled out in Armstrong report. * A/I Armstrong to provide new estimate/prediction for * A/I kW-hr/gallon for next season for generating 700 and * A/I and 750 kW avg loads. 2) Conservation of fuel for boilers. Only of order 2/3 of the station fuel is used for power generation, see Armstrong report page 52 (true in winter?). The next biggest use is building heat. The new station and other building need to be better sealed up. MAPO was discussed in last telecon, the new Station has also been discussed. * A/I George will produce fuel use pie-chart. * A/I Dick will provide update on fuel/kW efficiency and * projections on new available winter avg power with fuel storage. * A/I George will send out graphs for summer, winter, all year fuel * A/I consumption plots. Telecon was adjourned. Next meeting was scheduled for friday. We need to better understand fuel useage and possible conservation measures, as well as expected efficiencies for electrical power generation. Agenda for 3rd Tiger Team telecon (Friday noon EDT) 1) Review actions items: ----------------------------------------------------- From 1st telecon, including status reports from 2nd. * A/I ******************** * A/I BK/RPSC to check on ICECUBE double counting of DNF DONE Morse's number were double counted at 15kVa as noted above They are actually included in Rodwell and Toss lines page 40 * A/I: RPSC to verify power projections on Operations lines 15-27 on page 40 Update - in progress * A/I Carlton and Floyd to revisit 2007 cryofacilty projection with * A/I new information on re-liquifiers and N2 plant below. DONE - The table 65 Kva, that assumed 15 kVa for N2 plant + 3 re-liquidfiers + chiller and buiding. * A/I SCOARA to confirm re-liquifier useage through winter. * A/I SCOARA to confirm N2 plant duty cycle 7/21 DONE-- 30% provides comfortable contingency. We had assumed 50%, so this provides an additional -5 kW increment from 2006 and another savings of 5 kW in 2007 projections. * 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 Blaisdell will send comments on winterover report. * A/I Carlton to investigate heat exchangers to cool refrigerators DONE two refrigerators already use cooling loop. Freezer uses compressor, uses about 2.5 kW. * A/I B.K. to determine power requirement of refrigerators DONE * 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? * A/I ***************** ----------------------------------------------------- New action items from 2nd telecon: * A/I ***************** * A/I SCOARA to estimate new Cryo facilty numbers starting from * Carlton's numbers and updated N2 plant and re-liquifier plans. * A/I BF/RPSC check to see that full needs for DNF and its power requirements * A/I are accounted for. * A/I BK/RPSC will put together a plan for maximum power * A/I saving by putting much of a pod in survival mode. * A/I We need to know possible savings to 2007 projection, and * A/I also corresponding increment to current 2006 useage. * A/I George to provide longterm power generation plots for entire winter * A/I PRSS/Chiang to put together a full analysis for additional * A/I winter storage of fuel to allow contingency in power generation. * A/I Jerry to provide photos/info on tanks on berm * A/I Armstrong to provide new estimate/prediction for * A/I kW-hr/gallon for next season and fuel requirements for * A/I generating 700 and 750 kW avg loads. * A/I George will produce fuel use pie-charts. * A/I George will send out graphs for summer, winter, all year fuel * A/I consumption plots. * A/I ***************** The remaining agenda for this 3rd telecon is to understand if 1) we can meet the minimum avg power requirements and contingency for 2007 using a combination of fuel conservation and increased electrical power generation efficiency. and 2) is it possible to increase the fuel storage at site for winter 2007.