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HomeMy WebLinkAboutNunapitchuk Waste Heat Correspondence 1992State of Alaska Walter J. Hickel. Governor Alaska Energy Authority A Public Corporation November 23, 1992 The Honorable Lloyd Andrews, Sr. Mayor City of Nunapitchuk P.O. Box 190 Nunapitchuk, Alaska 99641 Subject: Waste Heat Concept Design Report Dear Mayor Andrews: Please find enclosed a copy of the Waste Heat Concept Design Report prepared by the Alaska Energy Authority for your community. This report identifies potential waste heat end-users and provides an estimate of the amount of fuel that would be saved (in both gallons and dollars) for several different combinations of end-users. A cost estimate based on prevailing wage rates and contractor construction is also included for construction of the most feasible waste heat end-user combination. The designs presented herein are schematic in nature and should not be construed as being complete in design or function. A thorough review of content and correctness should be performed prior to use in the development of construction documents. The Energy Authority is currently in the process of reviewing the cost estimates and proposed waste heat end-user combinations to determine if a waste heat project would be economically feasible for your community. If additional information is required, a member of my staff will contact you. If you have any questions or need additional information, please call Brian Gray or Steve Stassel at 800-478-7877 or (907) 561-7877 or FAX (907) 561-8584. y Direct Ul te Mine or/Rural Programs SS:DDC:nk Attachment as stated CC? Mark T. Teitzel, AVEC (Without Report) PO. Box 190869 701 East Tudor Road Anchorage, Alaska 99519-0869 (907) 561-7877 Fax: (907) 561-8584 92Q4\NK3923DOC(1) Walter J Hicke Alaska Energy Authority A Public Corporation February 6, 1992 Mr. Earle V. Ausman, P.E. Polarconsult Alaska, Inc. 1503 West 33rd Avenue, Suite 310 Anchorage, Alaska 99503 Subject: Contract #2800098 Work Order #8 (Noatak Waste Heat) Work Order #14 (Tununak Waste Heat) Work Order #15 (Nunapitchuk Waste Heat) Work Order #13 (Scammon Bay Waste Heat) Work Order #12 (Pilot Station Waste Heat) Dear Mr. Ausman: We have received your final invoices dated February 3, 1992, in the amounts of $1,886.58, $1,582.33, $1,404.58, $1,650.03, and $1,550.93 respectively on the work orders referenced above. This is to notify you that these work orders are being closed out. Any remaining funds that had been set aside for these work orders will be disencumbered and made available for future work under the contract. Sincerely, j f i / (hu ol lin S David Denig-Chakroff / Director of Rural Programs cc: Steve Stassel, Alaska Energy Authority. Gary Smith, Alaska Energy Authority Don Whelan, Alaska Energy Authority Marlys Hagen, Alaska Energy Authority a © PO. BoxAM Juneau, Alaska 99811 (907) 465-3575 ~Z PO. Box 190869 701 East Tudor Road = Anchorage, Alaska 99519-0869 (907) 561-7877 This study was prepared under contract with the Alaska Energy Authority by: Polarconsult Alaska, Inc. 1503 West 33rd Avenue Anchorage, Alaska 99503 The accepted conclusions are: 15 A potential for waste heat recovery has been identified in the community of Nunapitchuk. 2s Based on the proposed design and project cost estimate, the project is not economically feasible and does not appear to justify conventional financing. Alternate funding sources and/or revisions to the project scope will need to be evaluated. 3. | The designs presented herein are schematic in nature and should not be construed as being complete in design or function. A thorough review of content and correctness should be performed prior to use in the development of construction documents. The concept-level project cost estimate for Scenario #3 is $553,877. Final review comments and responses which were not incorporated into the report have been included in Appendix A. Accepted: , 2/ 24/9e Brian C. Gray Date Project Manager ZYFELI = Date Accepted: Manager of Rural Projects polarconsult alaska, inc. ENGINEERS e SURVEYORS * ENERGY CONSULTANTS Alaska Energy Authority February 5, 1992 P.O. Box 19086 Anchorage, Ak. 99519-0869 Atm.: Brian Gray Rural Systems Engineer Re: Waste Heat Reports for nine Villages. Dear Brian: We are transmitting this letter as requested in response to your technical questions on the nine waste heat recovery reports prepare for AEA. The questions are from the second review of these reports by Steven Stassel of AEA. Copies of the review comments are included with this letter. There were a number of basic assumptions made during the progress of these reports. As the projects are to be constructed in AVEC power plants, the modifications and connections within the plant were to meet with their requirements. We feel that there are a number of ways to decrease the cost of these projects without major impact on the reliability of the power plants by revising the piping connection schematics. Electric demand at the plants varies both hourly and seasonally. As the use of engines is entirely up to the local operator, it is difficult to determine which single engine, or which combination of engines, will be running at any one time. AVEC is also in the process of replacing aging or failed engines, and increasing the size of some plants due to demand as part of their normal maintenance. New engines are mostly Cummins engines that are more efficient. These engines produce less waste heat than the older engines they are Teplacing. These two factors have a major impact on the amount of waste heat available. Our analysis assumed that the most efficient engine at each plant would run continuously. Station heat requirements were based on having the engine requiring the greatest amount of supplementary waste heat to keep the buildings warm, running continuously as shown in the builling summary sheets in Appendix A. 1503 WEST 33RD AVENUE ¢ SUITE 310 ¢ ANCHORAGE, ALASKA 99503 PHONE (907) 258-2420 ¢ TELEFAX (907) 258-2419 polarconsult alaska, inc. February 5, 1992 Engine manufacturer's specification data is listed in Table III-A. Waste heat utilization simulation work sheets used more detailed heat rejection information at various loads, supplied by the engine manufacturer's. Heat loss figures input into the station heat loss section of the waste heat utilization simulation work sheets were for the engine requiring the most waste heat to keep all the AVEC buildings at 65°F. Heat content of 96,000 BTU for a gallon of heating oil was used for this report. This value was arrived at by using a gross heating value of 132,000 BTU for arctic grade diesel times an estimated efficiency of 73% for boilers. Since the report conclusions are entirely in gallons of oil saved, these assumptions are critical. The BTU content of oil varies depending on the source, blending and grades used, so results can vary plus or minus 5% due to variations in heat content. Further, oil fired equipment efficiencies vary greatly which introduces another plus or minus 5% possible variation in the results. All reports assumed that three trips would be made to each village by a skilled crew each year, to perform routine maintenance. Follows are answers to review comments for each report, as well as copies of the review comments. Sincerely Yours Earle V. Ausman wh9; WHIL09GB.DOC State of Alaska DN Naiter J Hickel. Governor Alaska Energy Authority A Public Corporation January 24, 1992 Mr. Earl Ausman Polarconsult Alaska, Inc. 1503 West 33rd Avenue Anchorage, Alaska 99503 Subject: Nunapitchuk and Tununak Waste Heat Recovery Pre-Final Reports Dear Mr. Ausman: Per our letter of understanding dated June 12, 1991, please provide responses to the following questions regarding the Nunapitchuk Waste Heat Report. Also, please rovide the assumed GPM and head-loss data for all circulating pumps for both the unapitchuk and Tununak reports. There are no questions or comments on the Tununak report. I look forward to receiving this information, and the corresponding information outlined in our letter of understanding for the other four reports, at your earliest convenience so that we may finalize the reports and process any outstanding invoices. Nunapitchuk Waste Heat Section 4.A.4 Include information on connection of the waste heat system to the high school heating system. Figure V-3. A. Please explain intended operation of aoome stem connection between Butler Building, SMI module, and tf Module. Some of the flow arrows appear reversed and the amot valve at the butler building is short circuited. Are the amot valves installed in a "mixing" or "bypass" mode? B. Note three, indicates a "skid mounted" radiator. Is this correct? Figure V-2,4,5,6 | V-2 shows 2.5" pipe to the elementary school, high school, and generator building. This does not agree with figure's V-4, 5 & 6 supply side piping. Please explain. Section VI, B.2.a (page 41) Please correlate Arctic pipe diameters with piping runs to high school, elementary school and generator building. Sincerely, Steve Stassel ~ Remote Systems Engineer II SS:jd O PO. Box 110809 Juneau, Alaska 99811-0809 (907) 465-3575 PO. Box 190869 701 East Tudor Road =Anchorage, Alaska 99519-0869 (907) 561-7877 92Q1\JD2351(1) polarconsult alaska, inc February 5, 1992 ee District Heat Report, Nunapitchuk Waste Heat Recovery 1. The district heating pipe will be buried and will come up through the floor in the mechanical room of the High School Building. User equipment will be located next to the furnaces in the mechanical room and will connect to a heating coil installed in the return air duct of the two furnaces. (See Figure IV-4.) 2.A. Cooling system is designed so that all the engines run through the primary heat exchanger, then to any of the three remote radiators for additional cooling if required. The amot valves are installed in a "mixing" mode. If return water from the heat exchanger is still too hot, the amot will open and allow coolant to flow to the radiators. A small hole would be required to be drilled in the amot valve to allow for a small amount of water to circulate through the radiators to alleviate cold shocking. Supply and return piping between the SMI module and the WH module, and the Butler Building cross over. Direction arrows are correct. 2.B. One engine has an existing skid mounted radiator which would be removed, and the engine connected to the common cooling system as shown in Figure V-3. 3. The distribution piping in Figure V-1 and V-2 is 2-1/2" diameter as shown. The Supply piping in Figure V-4 and V-S5 is 1-1/2" as shown. The piping necks down from 2 1/2" down to 1 1/2" at the building. The supply piping in Figure V-6 should be 2-1/2", not 3" as shown. Larger diameter distribution piping is used to keep the pipe head losses down, which in turn keeps the pump sizes and annual operation cost down. 4. Transmission pipe ranges from 2 1/2" diameter to 1 1/2" diameter, not 4" to 1" as indicated on page 41. State of Alaska d Walter J. Hickel, Governor Alaska Energy Authority A Public Corporation January 24, 1992 Mr. Earl Ausman Polarconsult Alaska, Inc. 1503 West 33rd Avenue Anchorage, Alaska 99503 Subject: ~Nunapitchuk and Tununak Waste Heat Recovery Pre-Final Reports Dear Mr. Ausman: Per our letter of understanding dated June 12, 1991, please provide responses to the following questions regarding the Nunapitchuk Waste Heat Report. Also, please rovide the assumed GPM and head-loss data for all circulating pumps for both the unapitchuk and Tununak reports. There are no questions or comments on the Tununak report. I look forward to receiving this information, and the corresponding information outlined in our letter of understanding for the other four reports, at your earliest convenience so that we may finalize the reports and process any outstanding invoices. Nunapitchuk Waste Heat Section 4.A.4 Include information on connection of the waste heat system to the high school heating system. Figure V-3_ A. Please explain intended operation of cooling system connection between Butler Building, SMI module, and Module. Some of the flow arrows appear reversed and the amot valve at the butler building is short circuited. Are the amot valves installed in a "mixing" or "bypass" mode? B. Note three, indicates a "skid mounted" radiator. Is this correct? Figure V-2, 4,5,6 | V-2 shows 2.5" pipe to the elementary school, high school, and generator building. This does not agree with figure's V-4, 5 & 6 supply side piping. Please explain. Section VI, B.2.a (page 41) Please correlate Arctic pipe diameters with piping runs to high school, elementary school and generator building. Sincerely, Steve meth Remote Systems Engineer II SS:jd PO. Box 110809 Juneau, Alaska 99811-0809 (907) 465-3575 PO. Box 190869 701 East Tudor Road =Anchorage, Alaska 99519-0869 (907) 561-7877 92Q1\JD2351(1) State of Alasko mm | Walter's, make! Bovernsr Hy Alaska Energy Authority A Public Corperation TELECOPY (ANCHORAGE Telecopy Phone No. (907) 561-8584) (QUNEAU Telecopy Phone No. (907) 465-3767) TELECOPY SENT TO: Eacie Aweerewn NAME OF COMPANY: Felaccounes!(* Alaska . Tne. COMPANY ADORESS: Arwnel\a. TELECOPY PHONE NUMBER: _24>— 2 <11 5D SENDER: Se -i Gane Ceca ws, TELEPHONE NUMBER: 2G@(-7ee+4 CHARGE CODE: NUMBER OF PAGES SENT: = INCLUDING THIS COVER PAGE DATE SENT: iz/o7/gno IF YOu 00 NOT RECEIVE ALL OF THIS TELECOPY PLEASE CALL: ($07) _ 261-7240-Anchorage (907) 465-3575-Juneau SPECIAL INSTRUCTIONS: = A. reve oe fe. poeta bk LA. Dacmtic Heot Pecovers Dealt Begeert Feviens Kemiateuts # teleclese cosenceraa 1 oer eo fica at joes DQ RO. BOK AM Juneau. Alaska 99811 (907) 465-3575 Mit PO. Box 190869 701 East Tuder Read) Anchorage Alaska 99519-0869 (907) 561-7877 TRANSMISSION REPORT THIS DOCUMENT (REDUCED SAMPLE ABOVE) WAS SENT *kK COUNT ** # 5 wR SEND doko NO REMOTE STATION I. D. | START TIME | DURATION | #PAGES COMMENT 1 9072582419 | 12- 7-90 12:54 3°31" | 5 TOTAL 0:03'31" 5 XEROX TELECOPIER 7020 Alaska Energy Authority A Public Corporation THERES CHOHPLY (ANCHORAGE Telecopy Phone No. (907) 561-8584) (JUNEAU Telecopy Phone No. (907) 465-3767) TELECOPY SENT T0: Earle Aveman NAME OF COMPANY: Lolarcousult Alaska . Inc, COMPANY ADDRESS: Amc. TELECOPY PHONE NUMBER: Z268-Z24(9 SENDER: Poriaw Grau TELEPHONE NUMBER: ZGI-7Z94 CHARGE CODE: NUMBER OF PAGES SENT: = INCLUDING THIS COVER PAGE DATE SENT: 127.0 O IF YOU DO NOT RECEIVE ALL OF THIS TELECOPY PLEASE CALL: (907) 261-7240-Anchorage (907) 465-3575-Juneau SPECIAL INSTRUCTIONS: “%& \Juuroe gitchok Waste Heat Lecovers DaaSt Pegert Peview Lemmeuvits = tele phen Lert sat "on Lonkicurat ion. © PO. Box AM Juneau, Alaska 99811 (907) 465-3575 S$ PO. Box 190869 704 East Tudor Road = Anchorage, Alaska 99519-0869 (907) 561-7877 MEMORANDUM Date: 12/07/90 To: Earle Ausman Polarconsult Alaska, Inc. From: Brian Gray Rural Systems Engineer Alaska Energy Authority Re: Various Waste Heat Recovery Draft Reports This is to serve as confirmation of our telephone conversation of 12/06/90. We have reviewed the sample calculations you provided on 11/25/90 which show a 1.1% decrease in waste heat delivered for the revised diurnal heat demand variation. Based on this information, we have decided that revising the calculations to reflect the corrected diurnal heat demand variation is not necessary. Please disregard the previous comments directing you to revise the calculations for the waste heat studies for Noatak, Pilot Station, Mt. Village, Scammon Bay, and Tununak. We have reviewed the Draft Report and Concept Level Design for Nunapitchuk and have the following comments. Please provide written responses to all review comments indicating if comment was incorporated or providing an appropriate answer/explanation with the pre-final submittal. This is the last draft report. I am looking forward to completion of this project. ie Executive Summary page 1, paragraph 1 - Nunapitchuk is not located in northwest Alaska but rather western Alaska. 26 Executive Summary page 1, paragraph 3 - Provide an explanation of the concepts investigated either here or in the introduction. 3. Executive Summary page 1, paragraph 4 - Revise to say "Project cost ... for Concept #5 are as follows". 4. Executive Summary page 2, paragraph 5 - See comment #1. 5. Table of Contents - Capitalize "Heating" on VIII-B. 6. Section I-D - See comment #1. Fie Section III-A, paragraph 1 - Is there a position #2 that is currently unoccupied? If so, should 10. 11. 12. 13. 14. 15. 16. 17. arrangements be made in the new piping to accommodate a future unit? Section III-B - The Program Notes in Appendix A indicate that the engine manufacturer’s test data was used not the engine specs listed in Table III-A. Coordinate. Section III-C, paragraph 1 - Does the existing radiator connected to units 1 & 3 have sufficient capacity to reject all of the heat produced by both engines simultaneously? Section III-C, paragraph 3 - A statement should be added which clearly identifies which combination of heat loss figures was used in the waste heat utilization simulation worksheets. Section III-D, paragraph 2 - Is the intent to attach the heat exchanger module to the Butler building or the generator module? Clarify. Section III-D, second paragraph on page 11 - Add "for the new heat exchanger module" after "district heating electrical systems." Section IV-A-1 - The Field Notes indicate that the school buildings are heated by forced-air furnaces while this section mentions hydronic systems. Coordinate. Section IV-A-2 - The field notes list the soils as ice- rich fine grained material which is highly frost susceptible. Is it feasible to bury hot distribution piping in this location? Also, the report should indicate if there are any known buried utilities along the proposed route of the heating lines. Section IV-A-4, paragraphs 3 and 4 - A heat exchanger and secondary pump are neither required or desired for the elementary and high school systems. The heating coil provides essentially the same separation on a forced-air system that a heat exchanger provides on a hydronic system. Section IV-B-3 - Provide an explanation in this section of the constant 231 gallon monthly consumption used. Section IV-B-4 - Change the reference from "school" to "water treatment building." Also, a similar statement should be added to sections IV-A, IV-C, and IV-D. 18. 19. 20. 21. 22. 23. 24. 25. 26. Section IV-C-4, paragraphs 2 and 4 - A heat exchanger and secondary pump are neither required or desired for the clinic and community hall systems. Section IV-D-4, paragraphs 2 and 3 - A heat exchanger and secondary pump are neither required or desired for the post office and public safety building systems. Figure V-1: A. Label the buildings at the AVEC Site. B. Section IV-A-2 states that easements will be required. Show on this drawing. iC. Why is the distribution piping at the city buildings run in a loop? See comment #21-C. Figure V-2: A. Delete the heat exchangers mentioned in previous comments. B. Indicate where the various pipe sizes occur. Cc. This figure shows branch piping to the city buildings teeing off of mains. This appears to be a more efficient arrangement. Coordinate with Figure V-1 and revise as required. Figure V-3: A. The flow patterns should be checked thoroughly as it appears there may be some errors in the piping arrangement. B. There is no mention anywhere else in the report of a skid-mounted radiator. Figures V-4 through V-12 - Correct the spelling of "Grundfos" and indicate the estimated GPM, head, and motor horsepower for the pumps. Figures V-5, V-6, and V-8 - Delete the heat exchangers. Section VI-B-1-b-5 - Add "primary" prior to "heat exchanger" and add "pumps," after "piping,". Also, replace "Engine" with "Primary" in the first line of the fifth paragraph on page 39. Table IX-A - It appears that Concept #5 only provides an additional 282 equivalent gallons of waste heat over Concept #4. After formulation of cost estimates, 27. 28. 29. 30. 31. 32. Concepts 3, 4, and 5 should be carefully evaluated to determine which is the best alternative. Section X - See comment #1. Appendix A, Page 1, Power Plant Heat - There is no indication on the Building Heating Summaries that an additional 2 ACPH has been added. Appendix A, Program Notes - The reference here should be to Table III-A, not Table III-B. Appendix A, Waste Heat Utilization Simulation Worksheets - The following comments apply to the worksheets for all concepts: A. Revise units under generator data to " (BTU/HR) /(KW)" not KWH as indicated. B. Under Building Data the fuel use for the piping loss should only appear for the particular building(s) being analyzed under that concept. Appendix A, Building Heating Summary Calculations - If the Caterpillar D3412 in position 4 is running at 1,800 RPM, as indicated in Table III-A, the combustion air should be 1,470 CFM not 1,020 CFM as indicated. Revise as required. Note that this comment applies to both versions of the calculations. Provide color photographs in the final report. NUNABGMI1 polarconsult alaska, Inc. LETTER ~F TRANSMITTAL 1503 West 33rd Avenue ¢ Suite 310 ANCHORAGE, ALASKA 99503 (907) 258-2420 FAX (907) 258-2419 - o ro Ae Eneeny Avtteerry e RE RECEIVED JUL 2 5 1990 ALASKA ENERGY AUTHORITY, WE ARE SENDING YOU Attached (] Under separate cover via____________the following items: C) Shop drawings C) Prints [] Plans 0 Samples 0 Specifications CJ Copy of letter C Change order ' VRE CEereey_ = COPIES DATE NO. DESCRIPTION _ = \ \ Dearr cefeez “\NudeprcHoe Dieta teat Cepoes & ConcepyT Leave Desien ”. \ INV. Fo@ NadaprcHok. Cefoer. THESE ARE TRANSMITTED as checked below: (For approval (C] Approved as submitted CI Resubmit copies for approval C For your use C Approved as noted (1) Submit copies for distribution ee requested C Returned for corrections Return corrected prints mere review andcomment ([) OC FOR BIDS DUE QS s«) PRINTS RETURNED AFTER LOAN TO US REMARKS COPY TO aaa 0S aoren: WA err a Hf enclosures are not as noted, kindly notify us at once.