Amendment No. 1 - Hydrogen Water Dropout Heat Exchangers.pdf
PDF 215 KB Posted
- Attached to
- Hydrogen Water Dropout Heat Exchangers
- Solicitation number
- 2026028947
- Issued by
-
Department of Energy Office of Science
About this file
This document is Amendment No. 1 to Request for Quote (RFQ) Number 2026028947 for Hydrogen Water Dropout Heat Exchangers issued by the National Laboratory of the Rockies, managed and operated by the Alliance for Energy Innovation, LLC. The amendment was issued on April 3, 2026, with a revised proposal due date of April 8, 2026, at 5:00 p.m. Mountain Time. The solicitation uses a Lowest Price (Cost), Technically Acceptable selection methodology. Proposals must be submitted electronically to Allison Pezzullo at Allison.Pezzullo@nlr.gov, and offerors must include confirmation of receipt and acceptance of this amendment in their cover letter.
The amendment addresses seven questions and answers regarding technical specifications for the heat exchangers. Key clarifications include: heat exchanger designs should be less than 1 cubic meter each; coiled shell and tube designs are acceptable; phase change occurs on the hydrogen side (water condensation) but not on the coolant side; hydrogen flow rates provided (36.5 kg/hr or 56.25 kg/hr) represent dry hydrogen mass only, with water vapor mass additional; water flow rates vary by heat exchanger with rates ranging from approximately 0.6 kg/hr to 56 kg/hr depending on the specific unit; all liquid water is removed by coalescing filters prior to cold-side inlet conditions, allowing assumption of single-phase hydrogen at saturated 100% relative humidity; and residual liquid water droplets are assumed negligible. Offerors must submit all required documents per Section 6 of the RFQ (Evaluation Process, paragraphs a through g) to be considered responsive.
View the file
Other files
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
Managed and Operated by the Alliance for Energy Innovation, LLC
National Laboratory of the Rockies
Managed and Operated by the Alliance for Energy Innovation, LLC Request for Quote (RFQ) Number 2026028947
Hydrogen Water Dropout Heat Exchangers
AMENDMENT NO. 1
Amendment Issue Date: 4/3/2026 Due Date for Proposals: 4/8/2026 Time Due: 5:00pm Mountain Time
1. Solicitation Type Lowest Price (Cost), Technically Acceptable Selection
Submit offers to the NREL RFQ Contact below
2. NLR RFP Contact Allison Pezzullo National Laboratory of the Rockies 15013 Denver West Parkway Golden, CO 80401 Email: Allison.Pezzullo@nlr.gov
Amendment No. 1 is hereby issued in response to questions received regarding the subject Request for Quote (RFQ). Please note that some questions may have been edited to address duplicate questions or to protect business-sensitive information provided in the original questions. The essence of the original questions are not affected. Questions are in no particular order.
1. Q. Is there any size and space constraint?
A. We can accommodate a range of sizes, and don’t have any specific hard requirements. However, as a sense of scale, we’d expect the designs to be less than 1 m^3 each.
2. Q. Would a coiled shell and tube type meet the technical specifications?
A. Yes.
mailto:allison.pezzullo@nlr.gov
3. Q. Is there a phase change happening in the HXs?
A. Yes, some phase change. The coolant side is expected to have no phase change. The hydrogen side will of course have no phase change of the hydrogen itself; however the hydrogen gas will be saturated with water (saturated at 100% RH for the conditions given in the technical specifications), and these heat exchangers are intended to cause water condensation for drop-out of water moisture (the heat exchangers are functionally intended to condense water from the hydrogen stream). Both the chilled water HX and the heat recovery HX will likely condense water from the primary inlet hydrogen stream.
4. Q. In the RFQ, when it states hydrogen flow, does this include the water?
A. No, the “hydrogen flow rate” provided is dry hydrogen mass only (36.5 kg/hr or
56.25 kg/hr). The total mass flow rate will also include the mass of the water vapor at the conditions given in the technical specification at the inlet.
5. Q. What is the water flow rate?
This is requested for all streams with hydrogen + DI water for HX-1 through 10.
A. Worst case inlet condition to the hot side of HXs 6, 7, and 8 would be 5 barg and 85°C saturated conditions which is 49% water by mass which is approximately a 36 kg/hr water vapor flow rate. The hot inlet of HXs 9 and 10 would be approximately 56 kg/hr.
In this case HXs 6, 7, and 8 cold side inlet condition would be 1.6% water by mass which is approximately 0.6 kg/hr of water vapor. The cold inlet of HXs 9 and 10 would be approximately 0.9 kg/hr.
6. Q. On HX-6 thru 10, on the cold side, if the steam enters the heat exchanger as two-phase (H2 and water), but exist only H2? Or is it H2 and water but the is water vaporized and all exist single phase?
A. You may assume all liquid water is removed by the coalescing filter allowing the inlet of cold side of HXs 6 through 10 to be single phase hydrogen at saturated 100% RH at the calculated conditions.
Reheating of the cold side of HXs 6 through 10 is expected to raise the dew point and go from hydrogen gas that is saturated with water (saturated at 100% RH for the conditions given in the technical specifications) to partially saturated hydrogen gas (RH < 100%). This will help the water remain in the vapor form downstream of the cold side of HXs 6 through 10 and exit as a single phase.
7. This cold stream has the water removed prior to entering HX-6 thru 10, but I assumed not all of water was removed.
A. You may assume all liquid water is removed by the coalescing filter allowing the inlet of cold side of HXs 6 through 10 to be single phase hydrogen at saturated 100% RH at the calculated conditions. Any residual liquid water droplets should be sub 1% of the mass flow and can be assumed to be zero for simplicity.
As a reminder, each proposal must be submitted electronically to Allison.Pezzullo@nlr.gov by the deadline date of 4/8/2026. To be considered a Responsive Offeror, please include all the required documents per the instructions listed in the RFQ (Section 6 – Evaluation Process, paragraph a through g).
If your company submits a quote, please include confirmation of receipt and acceptance of this Amendment in your cover letter. Thank you for your interest in this project. We look forward to receiving your proposal!
mailto:allison.pezzullo@nlr.gov
Submit offers to the NREL RFQ Contact below
File details come from the government source that posted it. Updated .