Included below: Notes from 3rd South Pole Power Tiger Team telecon on Friday July 21 10:00am MDT, 11:00am CDT, 12:00pm EDT Agenda for 4th Telecon Wednesday July 26, 2:00pm MDT, 3:00pm CDT, 4:00pm EDT Call in info: TBA Please review notes and summary from July 21 telecon below. Tentative agenda for next telecon follows the notes. We hope next telecon will be final telecon. Please send any agenda items that we may be missing. This file is also posted on SCOARA web page: http://astro.uchicago.edu/scoara/2006-power/index.html -------------------------- Notes from July 21 telecon: Participants: Y John Carlstrom Y Bob Morse & Andy Laundrie Y B.K. Grant, Carlton Walker, Martin Lewis, Dave Scheuerman & Joe Crane Y Erick Chiang N Vladimir Papitashvili Y Chris Martin Y George Blaisdell N John Rand Y Dick Armstrong Y Steve Padin Y Scott Borg (listening) Y Jerry Marty N Jack Lightbody (observer) Y Sandy Singer ------------------------------------------------ 1) Review actions items - this telecon was devoted to updates on action items. Telecon notes are included in the action items updates. --------------------------------------------------------------- Action items from 1st telecon, including Updates from 2nd, and 3rd telecons: * 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 7/21: 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. UPDATE: 7/21 in progress, Will need to be ready for next telecon. * A/I SCOARA to confirm N2 plant duty cycle 7/21 UPDATE -- appears that 30% provides comfortable contingency but jury is still out. We had assumed 50%, so this provides an additional -5 kVa increment from 2006 and another savings of 5 kVa in 2007 projections. * SAVE 5 kVa avg in 2007 projection * Increment of -5kvA * A/I SCOARA liquid cryogen working group is looking in to more efficient * A/I nitrogen plants, especially if used with lower duty cycle. Update - needed for next telecon. * A/I George Blaisdell will send comments on winterover report. Update - will be sent 7/21 * 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 - see above. * A/I Vladimir: understand EMI issue and make decision on lights UPDATE 7/21 - we can at least use 60 Hz balast - Savings would be 7.5 kW Could also consider turning off more lights. There was concern about loss of illumination, but in fact this is only about 10%. EMI would be minimal. * SAVE 7.5 kW from 60 Hz lights replaces previous 12.6 kW savings expectation * Increment for lights - previous increment of -12.6kW, should be -7.5 kW * A/I RPSC - do we have fuel impact of better station weather barriers? * A/I Carlton is planning to inspect and better seal up MAPO - fuel savings? * A/I ***************** ------------------------------------------------------------------ Action items from 2nd telecon, including updates from 3rd telecons: * A/I ***************** * A/I SCOARA to estimate new Cryo facilty numbers starting from * Carlton's numbers and updated N2 plant and re-liquifier plans. Update 7/21 - need this by next telecon. * A/I BK/RPSC check to see that full needs for DNF and its power requirements * A/I are accounted for. UPDATE 7/21 Carlton looked at current DNF and expectations. It appears that we should add an Increment to current and also to projection for 2007 winter avg of 4 kVa. * SAVE -4 kVa for full accounting of DNF, e.g., 4 kVa more than * SAVE that accounted from in 2007 projections on page 40. * Increment to 2006 of +4 kVa for full accounting of DNF needs. * 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. UPDATE 7/21 RPSC talked this through extensively. Looks like only saving are fewer people. Currently only using A1 and 14 personnel in B1. A4 is cold as possible already. If we kept population to 50, We'd save 3-4 kW in increment and projection. Note 2007 projection on page 40 were based on current low power useage. * A/I George to provide longterm power generation plots for entire winter DONE - posted on web page. * A/I PRSS/Chiang to put together a full analysis for additional * A/I winter storage of fuel to allow contingency in power generation. UPDATE - ongoing now, Several items, e.g, lower suction tubes to take addition 8,000 gallons of fuel from existing tanks. Tests have been done to show that fuel is not too contaminated. Expect other analyses and need for additional fuel by Tuesday 7/25, including additional fuel storage possibilities. * FUEL: Lowering suction tubes give us + 8000 gallons. * A/I Jerry to provide photos/info on tanks on berm DONE: Note they are currently used as part of the surface fuel supply. * 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. UPDATE 7/21: Dick has assumed efficiency of 13.6 kW hr/gallon based on early march numbers with peaking generator often running. Peaking generator is not ducted to suck outside air. He's confident that efficiency will improve, but we need to do tests. Exhaust temps have come down already. This should help restore peak power generation to 989 from 939 kW and also efficiency. Heat exhanger on peaking generator would also help capture thermal heat for the station, thereby reducing fuel use in boilers/furnaces. Will need install intake ducting for peaking generator and make measurements before we get reliable numbers. Dick is guessing ~13.8 kw hr / gallon at ~ 700 - 750 kW avg supplies, but we have to wait for real numbers. * A/I George will produce fuel use pie-charts. DONE - posted on web site. Explanation: winter chart is for most recent 36 weeks of winter, 20 from this winter, and 16 from last season. This shows that 70% of fuel used went to generators and 25% to facilties, i.e., to boilers/furnaces for thermal heat. The winter average of 70%, much higher than the 62% used in Dick's report. If this holds up, then we could infer that we have 8% of roughly 400,000 gallons more to send to the generators, i.e., 32,000 gallons, add to that the additional 8,000 gallons gained by lowering the tank suction tubes and you get 40,000 gallons - enough to generate an additional winter avg of approximately 80 kW. Encouraging, but we need the details. * A/I George will send out graphs for summer, winter, all year fuel * A/I consumption plots. DONE Posted on web site. * A/I ***************** ------------------------------------------------------------------ Action items from 3rd telecon * A/I NOTE: All major activities mentioned above should be able to report * A/I their findings at the next telecon, fuel conservation, additional * A/I fuel on station, improved fuel useage projections, etc. * A/I Science groups to report on contingency they have in their * A/I 2007 projected power numbers. As Bob put it, if there is * A/I no fat left in their power budgets, what muscle could they * A/I cut for contingency and possible power shedding, especially * A/I if the alternative is not to deploy. * A/I SPT: Padin, ICECUBE/AMANDA: Morse, CMB exp: SCOARA * A/I PRSC What fuel savings can we expect from better weather-proofing * A/I the buildings, especially the new elevated station and MAPO, * A/I both of which are known to be quite leaky. With the above reports in, the work that remains for the tiger team for its 4th and hopefully last telecon is: 1) Determine if we can meet the minimum (i.e., delaying some station upgrades, etc) average power requirements with contingency for 2007, using a combination of fuel and electical power conservation and increased electrical power generation efficiency, but without adding additional fuel storage. 2) Review what it would take to increase the fuel stored at site for winter 2007. What would be needed in light of #1 above. 3) Determine the final recommendations of the tiger team. And, determine the form of its final report and writing assignments.