Amendment No. 2 to RFQ 2025022604.pdf
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- Dry Coolers
- Solicitation number
- RFQ_2025022604
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Department of Energy Office of Science
About this file
This is Amendment No. 2 to RFQ No. 2025022604 issued by the National Renewable Energy Laboratory (NREL) for Dry Coolers, with proposals due December 13, 2024 at 4:00pm Mountain Time. The amendment makes two key changes: correcting the required process flow rate from 1,300 GPM to 2,500 GPM, and providing answers to technical questions.
The technical specifications include a target process fluid outlet temperature of 45°C, with lower temperatures acceptable. The planned layout consists of two rectangles, each 53' long x 14' wide, and either flatbed or V-type cooler configurations are acceptable. NREL prefers AC motors over EC motors for reliability, though this is not a requirement. The cooler must handle both continuous full load operation for long-term experiments and varying loads for short-term experiments under an hour. Independent fan on/off control is required for operating conditions under 6 MW, but louvers are not needed as closed loop temperature control is not required. This is a Lowest Price Technically Acceptable solicitation, with quotes to be submitted electronically to christopher.ragain@nrel.gov.
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Text version
National Renewable Energy Laboratory Managed and Operated by the Alliance for Sustainable Energy, LLC
Request for Quote (RFQ) No. 2025022604
AMENDMENT NO. 2
“Dry Coolers”
Amendment Issue Date: 12/03/2024 Due Date for Technical Questions: 11/29/2024 Due Date for Proposals: 12/13/2024 Time Due: 4:00pm Mountain Time
1. Solicitation Type Lowest Price Technically Acceptable
Submit offers to the NREL RFP Contact below
2. NREL RFP Contact Chris Ragain, Subcontract Administrator National Renewable Energy Laboratory 15013 Denver West Parkway Golden, CO 80401 Email: christopher.ragain@nrel.gov
Amendment No. 2 is hereby issued to A. Correct the required process flow rate and B. Post the new set of technical questions (in black) and their related answers (in red).
A. A mistake was found in the originally submitted technical specifications stating the required flow rate as 1,300 GPM. The correct flow rate that NREL requires is 2,500 GPM.
B. Technical Questions & Answers:
I see the process duty, process flow and process inlet temperature in this document which we could use to calculate the process fluid outlet temperature. However could you provide your target process fluid outlet temperature so we can be sure that before we do all the design and quote we are sure we are meeting your needs?
o Target process fluid outlet temperature: 45 C
Yes, louvers are way to control the process fluid outlet temperature. You don’t have them on the existing cooler. If you haven’t needed louvers for the current unit, you may not need them for this new unit?
o We do not need louvers, as closed loop control of process fluid outlet temperature is not required.
o Target process fluid outlet temperatures lower than the stated maximum of 45 C are acceptable.
o However, independent fan on/off control is necessary during operating conditions when heat rejection is well under 6 MW.
Are there space (footprint) constraints onsite and other surrounding equipment that the cooler be designed around. Related to that, does NREL have a preference for flat bed or V-type cooler configuration.
o The planned layout is made up of two rectangles, each 53' long x 14' wide.
o Either flatbed or V-type cooler configuration is acceptable.
Does NREL have a preference for Electronically Commutated (EC) or Alternating Current (AC) motors.
o We have a preference for AC motors for their increased reliability. The increased energy efficiency associated with EC motors is not important to us.
o This is just a preference, not a requirement.
Does NREL plan to operate the cooler at full load continuously or would the cooler have varying load over the course of a day/month. This would help offer the right control strategy (louvers vs variable speed fans) to maintain process fluid outlet temperature.
o This will depend on the test; both operating conditions are possible. Long term experiments may require continuous full load operation of the dry cooler, but short term variable experiments will require a varying load for the dry cooler over the course of less than an hour.
o Regardless of the experiment, strict control of process fluid outlet temperature is not required. Outlet temperatures lower than the maximum of 45 C are acceptable.
Please Submit the Quote(s) electronically to christopher.ragain@nrel.gov
File details come from the government source that posted it. Updated .