CO2 condensing unit

SLAC National Accelerator Laboratory is operated by Stanford University for the Department of Energy. As a management and operating contractor, subcontracts awarded by the Laboratory are not Federal procurements, and are not directly subject to the Federal Acquisition Regulations in 48 CFR. Nonetheless, certain Federal laws, Executive Orders, and regulations may affect our DOE approved purchasing system, as required by statute, regulation, or contract terms and conditions. AMENDMENT 10 HI, The following Addendum is being issued for the subject Request for Quotation: 349035 CO2 Condensing Unit Revise previous statement in Amendment 9 to: A possible option that can be considered would two stages but single compressor. As far as concerning the question on the piping diagram , the temperature range of the CO2 would be +10,-35C, the minimum refrigeration capacity at -40C refrigerant evaporating temperature shall be 4kW The Carbon dioxide is entering the condenser at 50% vapor quality and needs to be fully condensed with -3 degC subcooling. This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov AMENDMENT 09 HI, The following Addendum is being issued for the subject Request for Quotation: 349075 CO2 Condensing Unit ANSWERS TO QUESTIONS: We need to know the piping diagrams (where they will connect the CO2 pump) and min. and max. capacities in variable evaporating temperatures to design the unit. ANSWER: a cascade system with two compressors does not pass the cut of the critical requirements: mass and dimensions A possible option that can be considered would two stages but single compressor. As far as concerning the question on the piping diagram , the temperature range of the CO2 would be +10,-40C, the minimum refrigeration capacity at -40C shall be 4kW The Carbon dioxide is entering the condenser at 50% vapor quality and needs to be fully condensed with -3 degC subcooling This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov AMENDMENT 08 HI, The following Addendum is being issued for the subject Request for Quotation: 349035 CO2 Condensing Unit ANSWERS TO QUESTIONS: The solicitation letter has the answers to all questions except the last one. Capacity Requirement: Please specify the required capacity for the application in question. 4000 W at -40 C evaporator temperature of the primary refrigerant. Suction Temperature: What is the recommended suction temperature range for optimal performance? It is a function of the selected refrigerant at the primary circuit and the design of the primary circuit. Voltage: Could you confirm the voltage specifications necessary for the application? It has specified at 460V 60 Hz three phases. Actual voltage could be +/-10% of the nominal voltage. Application: Lastly, we would appreciate any details regarding the specific application context in which these specifications will be utilized It is for camera/detector cooling. This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov AMENDMENT 07 HI, The following Addendum is being issued for the subject Request for Quotation: 349035 CO2 Condensing Unit The bid close date is extended from September 27,2024 to October 11, 2024. This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road AMENDMENT 06 Hi, The following Addendum is being issued for the subject Request for Quotation: 349035 CO2 Condensing Unit Amendment to Technical Evaluation Criteria: SLAC is the process to build a refrigeration system to condense Carbon Dioxide by mean of a standard vapor compression refrigeration unit, working with any refrigerants approved by California Laws, ideally R448a The evaporator running with R448a or similar, must be a plate heat exchanger, condensing on the counter flowing side, a maximum flow of 30 g/s Carbon dioxide entering at .5 vapor quality. Because of the CO2, the pressures rating of the plate heat exchanger must 73 bar Amendment to Technical Evaluation criteria: Replace 5 with : - Condensing unit with vapor compression cycle running on R448a Replace 6 with: - Evaporator provided: Plate heat exchanger rated for 73 bar This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov Amendment 05 HI, The following Addendum is being issued for the subject Request for Quotation: 349035 CO2 Condensing Unit The bid close date is extended from 9/19/2024 TO 9/27/2024 This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov AMENDMENT 04 HI, The following Addendum is being issued for the subject Request for 349406 : CO2 Condensing Unit Answers to questions: Where are those rough estimates on size and weight or is there a plan to install the unit in a specific place where access or clearances are limited? Listed dimension and weight in the solicitation are; 48'x45'x62" and no Higher 1200lbs. ANSWERS: The dimensions is fixed. They can make the condensing unit to have a smaller footprint. The weight is the maximum. They can make the condensing unit lighter. This condensing unit is to be installed on a fixed frame (60'x60'x96). This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov Amendment 03: Hi, The following Addendum is being issued for the subject Request for Quotation: 349035 Condensing Unit Bid close date will be extended from 9/12/2024 to 9/19/2024. This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov Amendment 02: HI, The following Addendum is being issued for the subject Request for Quotation: 349035 CO2 Condensing Unit Answers to questions: We do not have a firm requirement on the cooling capacity at 10 C. Usually, the cooling capacity at 10 C is much higher than that at -40 C. If I need to set the capacity requirement, I will say 10,000 W. This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Amendment 01 HI, The following Addendum is being issued for the subject Request for Quotation: 349035 CO2 Condensing Unit Answers to questions: (Batch 1) Pleased provide details on: Controls: timer / pressure controls / etc. Suction accumulator Oil separator Additional features / options Do you have any evaporator information included (provided by others) with this system? (brand / model / voltage /etc.) Answers: We are looking for a CO2 condensing unit. The CO2 condenser should have a minimum working pressure of 80 bar, or 1160 psig. The refrigeration circuit should have proper pressure control such as using a pressure switch or pressure relief valve. With regards to the refrigeration circuit, a suction accumulator is preferred. If the vendor uses an oil lubricated compressor, having proper oil separator is a must For Evaporator information included - SLAC cannot provide the brand/model/voltage- vendor has to provide this information in proposal. This Addendum modifies the Request for Quotation and must be acknowledged. Failure to acknowledge all addenda could make your proposal non-responsive. Please confirm that the submitted proposal is not changed because of this addendum. If proposal sent is revised because of this, please submit the revised proposal. The following changes are hereby made to the appropriate documents contained the above-mentioned Request for Quotation (RFQ). All other terms and conditions of the RFQ remain the same. Thank you very much. Katherine Jill A. Coh SCM Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Tel: +1 (555) 000-0000 Email: contact@example.gov Hello, SLAC National Accelerator Laboratory has a requirement for the following item(s) listed below. 1.) CO2 condensing unit = Qty 1 Specifications: SLAC is in the process of building a prototype CO2 cooling plant. This CO2 cooling plant is to provide CO2 at subcooled state with CO2 flow rate ranging from 5 g/s to 30 g/s and temperature ranging from 10 C to -30 C. This CO2 condensing unit is to condense, cool down and maintain the CO2 flow at subcooled state. It utilizes a vapor refrigeration circuit to generate the cooling. The refrigerant should have an ASHRAE refrigeration classification of A1 (low toxicity and nonflammability) and is not listed at the Section 95374 - List of Prohibited Substances in CA. The power supply of the condensing unit is 460v/3ph/60hz. The condenser of the refrigeration circuit should be water cooled with cooling water inlet temperature at 17 C (63 F). The condensing unit should use expansion valve with adjustable cooling temperature and cooling capacity. The use of cylinder unloader and/or VFD to adjust the cooling capacity is recommended. When at full capacity, the condensing unit should give a cooling capacity of 4000 W with evaporator temperature at -40 C. The system weight should be less than 1200 lbs. The condensing unit should contain a CO2 condenser to condense and maintain CO2 fluid at the subcooled state. It should have a MAWP of 80 bar. Once the CO2 condensing unit deliver, the integration with the CO2 circuit (the CO2 pump, accumulator, flowmeter, and plumbing) will take place. The CO2 fluid and the CO2 pump is provided by SLAC. SLAC will take the ownership of integration of the CO2 condensing unit with the CO2 circuit at SLAC Technical evaluation criteria: Dimensions not higher than 48'x45'x62 Refrigeration Capacity 4kW at -40 Adjustable Evaporation temperature -40,+10 Water cool condenser with water inlet temperature at 63F Vapor compression cycle, no intermediate fluid CO2 condenser provided Weight of the unit less than 1200 lbs Optimized power consumption such as using cylinder unloader Quote is for product only; no on-site services permitted. Source selection will be based on Lowest Priced Technically Acceptable Method. Please provide a price and lead time quotation by COB September 12, 2024. Send quote to contact@example.gov. Please be advised that the requirement was also posted in SAM.gov. Is there any room for additional discount such as for Academic, ICPT, GSA, or Government Institutions? Buy American Act Certification (BAA) applies to awards over $10,000. Representations & Certifications Rider is required. Once completed the Reps and Certs is valid for one year until renewal. If you have already completed one within the year please disregard. Otherwise, please complete and return. All subcontractors are required to register in the System for Award Management (www.sam.gov). If possible, please provide a link to your webpage for published price list to substantiate for the prices quoted. The resulting purchase order will be issued on a fixed price basis. SLAC National Accelerator Laboratory Terms and Conditions for Fixed Price Commercial Supplies and Services (Rev. August 2023) will be made a part of the resulting order. Please mark up terms and conditions if you wish to negotiate. No mark ups mean that you accept SLAC Terms and Conditions. Payment Terms will be NET-30 Freight terms will be FOB Destination Prepaid and Add You are requested to mark and identify proprietary/confidential information provided in response to the solicitation. Contact me directly with any questions. Sincerely, Katherine Jill A. Coh Procurement Commodities Team Lead SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 Phone: +1 (555) 000-0000 Email: contact@example.gov