Included below: Particpants on the 4th and hopefully last telecon. The 4th South Pole Power Tiger Team telecon was held on Wednesday July 26 2:00pm MDT, 3:00pm CDT, 4:00pm EDT Action items from first three telecons. Agenda for 4th telecon. Notes from 4th telecon. This file is also posted on SCOARA web page: http://astro.uchicago.edu/scoara/2006-power/index.html -------------------------------------------------------------- Participants on July 26 telecon Y John Carlstrom Y Bob Morse & Andy Laundrie Y (B.K. Grant), Carlton Walker, Martin Lewis, Dave Scheuerman & Joe Crane Y Erick Chiang Y Vladimir Papitashvili Y Chris Martin Y George Blaisdell Y John Rand Y Dick Armstrong Y Steve Padin Y Scott Borg (listening) Y Jerry Marty N Jack Lightbody (observer) N Sandy Singer Y Jim Yeck --------------------------------------------------------------- Action items from 1st telecon: * 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 * 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 DONE 7/26 - see below. * 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. DONE 7/26 - see below. Agenda for 4th and hopefully last telecon: 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. --------------------------------------------------------------------- NOtes from July 26, 2006 telecon: George Blaisdell presented six actions to address enhanced power generation for winter 2007. 1. Do nothing. 646 kW continuous demand. This is lower than assumed previously due to better estimates. Biggest change is due to updated fuel use on station, 55,000 gallons are being used to generate thermal heat (furnace and boilers) due to excessive infiltration/exfiltration. 2. Save fuel by shooting for 14,000 gallon design on station use for thermal heat generation. Find and fix heat leaks, This would allow another 91 kW. Infiltration, exfiltration issues. 3. Extend the available fuel from the tanks by lowering suction intakes, 8000 gallons more fuel, -> 18 kW additional supply. (up to 109 kW so give us 755 kW winter average for winter, and this does leave the 70,000 contingency/emergency fuel supply and the fuel needed for Rod well #3) These actions are given first because they are stressing efficiency. The next issues address increasing fuel storage and supply at South Pole. They could be in place 2007, but require considerably more effort. 4. Deliver the eight fuel team sleds used by the traverse, 8 x 3000 gallons x 95% useable, 22,800 equal to 51 kW. No traverse planned, but that is an option for consideration. The tanks are about 10,000 lbs each. 5. In lieu of #4, bring in 2 ea 25,000 gallon fuel bladders. These could be fueled to capacity to give 111 kW over the winter. They need to have containment system. 6. New tanks of the type currently used for service storage, 10 x 5000 gallons at 95% gives 102 kW. A/I: George will send out summary of these actions and further details in table format. Further science savings: SPT - Could save 10 kW for winter 2007. Rechecked and updated all estimates and finds 62 -63 kW, Note this is only savings for 2008. The 10 kW would be required in 2008 winter. ICECUBE/AMANDA - Morse. Shut down SPASE for 4 kW. AMANDA SN trigger system would save 3.5 kW, Shutting down one of the data acquisition would save between 5 & 6 kW (10 out 23 kW from AMANDA). Prepared to give up if necessary. A/I: Morse to email firm saving numbers. Morse and Yeck stresses that AMANDA and SPASE savings are contingent on approval of science team. They would cost science capability. The one time saving of 10 kW from ICECUBE for 2007 does not cost science scope. ICETOP - could shut down strings, but computing support in icecube lab would mean the electric heat would need to compensate - no net gain in power and lose of science. NO HELP. Morse suggests total saving would be 15 kW *permanent savings*. Andy and Bob checked the numbers in the tables again. After the 15 kW of double counting, they think they could save the summer heat, 75 kW could be 60 kW summer only savings. They were able to reduce heating in winter as well for further 7 kW saving. Erick's Chiang's take on it - definitely lower the suction tubes - Infiltration exfiltration issues - Carlton believes we could do it, but has reservations as to how much saving would be done. Dick adds that we need to also add heat exchanger. Let's assume these are done and we achieve 80% to 14,000 gallons then we're at 736 kW. - Next is bladders, at least one 25,000 gallon flight, Carlton says it is not too hard to wire up as they used to fuel station that way. This is the 50 kW contingency. Peaking generator - would run to mains when the peaker was serviced. Otherwise we would have to keep power below 660 kW. 500 and 1000 hours maintenance for one shift for oil change and valve adjustment. Dick agrees with me on double firm contingency. All these assume 13.6 kW hour / gallon which was established earlier this winter with main and peaker running. This is a low efficiency configuration, Work is planned to bring in the cold air on the mains and peaking generator to increase efficiency. Our back up is to have plan to put a bladder in place with containment. Make it our recommendation. Dick agrees. Rand agrees. etc. RPSC agrees. Could place it in bio med. Review savings: - Al Baker, can we save the re-liquidfiers chillers with heat exchangers but it does not come free. Requires engineering and work. - Lights can be done, SPUC rep and PI's are happy. Erick would like us to think more about contingency planning. What do we do if we lose. - make this a recommendation to develop. Carlstrom to circulate a first draft of the report on Friday July 28.