Attachment 1 - Technical Specifications -Hydrogen Water Dropout Heat Exchangers.pdf

ATTACHMENT 1

"Hydrogen Water Dropout Heat Exchangers"

1/29/2026

BACKGROUND

This purchase is to acquire a quantity of 10 heat exchangers (HX) that will cool the hydrogen process stream produced by PEM electrolyzer stacks being tested as part of the Multimegawatt (MMW) Electrolyzer project. The process fluids will be 50/50 propylene glycol/water and hydrogen saturated with water. The portions of each heat exchanger containing hydrogen need to be cleaned and passivated for service with DI water.

OBJECTIVE

Two heat exchangers (HX) will be operated in series and five pairs of HXs are required.

Initial phase separation will occur upstream of hot side inlet of HXs 6-10. HXs 6-10 will provide a small amount of initial cooling of a warm hydrogen stream which is saturated with water and has potential to have liquid water in the stream. Two phase flow is expected on the inlet of the hot side of HXs 1-5. The cold side of HXs 1-5 is a 50/50 water glycol mix providing cooling the hydrogen stream. The purpose of this cooling is to bring the dew point of the hydrogen stream down to 8°C forcing water saturated in the hydrogen gas into the liquid water. The liquid water is then removed using a coalescing filter. The stream of saturated hydrogen gas is then returned through the cold side of HXs 6-10 allowing slight reheating of the hydrogen gas stream to reduce the potential of liquid water condensing out of hydrogen gas creating single phase fluid flow.

Figure 1 directly below shows the flow path and fluids through the HXs. This procurement is for ten heat exchangers, accounting for five of the systems shown in Figure 1. HX’s 1-3 will be paired with HX’s 6-8 respectively in the layout shown below.

HX’s 4 and 5 will be paired with HX’s 9 and 10 respectively in the same layout. The critical temperatures are also shown in this drawing.

H2 + H2O IN

H2 OUT GLYCOL/WATER IN

GLYCOL/WATER

OUT

GLYCOL/WATER

HYDROGEN AND WATER (2 PHASE)

85°C

2.78°C

8°C 8°C

HX’s: 1,2,3, 4, 5

HX’s: 6,7,8,9,10

15°C

Coalescing Filter

Water Removal

Water

HYDROGEN GAS (SINGLE PHASE)

Figure 1: Flow path through the heat exchangers. Five of these systems are to be built using ten heat exchangers.

REQUIRED CAPABILITIES:

To be considered a ‘responsive offeror’ the following required capabilities must be met:

• A total of ten HXs shall be delivered.

• No sulfur-containing components (e.g., lubricants) shall be used in the wetted sections of the HXs with hydrogen saturated with deionized water

• Pressure-containing portions of the HX shall be designed to the applicable sections of ASME pressure codes.

• Metallic material shall be 316/316L stainless steel

• Soft sealing material if required shall be FKM/Viton, PTFE, or Teflon

• Include delivery costs and freight to NLR Flatirons Campus: 19001 W 119th Ave, Arvada, CO 80007

• NLR will provide a climate-controlled enclosure in which the heat exchangers shall be deployed

• Connections to the HXs shall be 1.5 inch Swagelok compression fitting with the alternatively option of 1.5 inch ANSI raised face flange fittings/studded port

• The technical specifications for sizing each HX are listed below:

o HXs 1, 2, and 3:

Hot side: hydrogen saturated with deionized water

• Materials shall be compatible with deionized water with a conductivity ranging from 1-17 MOhm-cm

• Maximum allowable working pressure (MAWP) shall be > 1087 psi (75 bar)

• An operating pressure of 72.5 psig (5 barg) shall be used for performance criteria calculations

• Pressure drop across the heat exchangers shall be < 2.9 psi (0.2 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• The inlet temperature shall be equal to the outlet temperature of the hot side of HXs 6, 7, and 8

• Outlet temperature shall be 46.4°F (8°C)

• Hydrogen flow rate through the HX will be 36.5 kg/hr

(256.37 SCFM)

• The hot side of the HXs shall be electropolished or passivated in accordance with ASTM A967 or material selected properly cleaned for Type I DI water service on the wetted sections of the HXs with hydrogen saturated with deionized water.

Cold side: 50/50 water/propylene glycol with corrosion inhibitor (e.g., Dynalene PG)

• Maximum allowable working pressure (MAWP) shall be > 100 psi (10.3 bar)

• Pressure drop across the heat exchanger shall be ≤15 psi (1.03 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• Inlet temperature shall be 37°F (2.78°C)

• Coolant flow rate through the HX will be 15 gpm o HX 4 & 5:

Hot side: hydrogen saturated with deionized water

• Materials shall be compatible with deionized water with a conductivity ranging from 1-17 MOhm-cm

• Maximum allowable working pressure (MAWP) shall be >

1087 psi (75 bar)

• An operating pressure of 72.5 psig (5 barg) shall be used for performance criteria calculations

• Pressure drop across the heat exchangers shall be < 2.9 psi (0.2 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• The inlet temperature shall be assumed to be equal to the outlet temperature of the hot side of HXs 9, and 10

• Outlet temperature shall be 46.4°F (8°C)

• Hydrogen flow rate through the HX will be 56.25 kg/hr

(395.3 SCFM)

• The hot side of the HXs shall be electropolished or passivated in accordance with ASTM A967 or material selected properly cleaned for Type I DI water service on the wetted sections of the HXs with hydrogen saturated with deionized water.

Cold side: 50/50 water/propylene glycol with corrosion inhibitor (e.g., Dynalene PG)

• Maximum allowable working pressure (MAWP) shall be > 100 psi (10.3 bar)

• Pressure drop across the heat exchanger shall be ≤15 psi (1.03 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• Inlet temperature shall be 37°F (2.78°C)

• Coolant flow rate through the HX will be 20 gpm o HXs 6, 7, and 8:

Hot side: hydrogen saturated with deionized water

• Material shall be compatible with deionized water with a conductivity ranging from 1-17 MOhm-cm

• Maximum allowable working pressure (MAWP) shall be > 1087 psi (75 bar)

• An operating pressure of 72.5 psig (5 barg) shall be used for performance criteria calculations

• Pressure drop across the heat exchangers shall be < 2.9 psi (0.2 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• Inlet temperature shall be 185°F (85°C)

• Hydrogen flow rate through the HX will be 36.5 kg/hr

(256.37 SCFM)

• The hot side of the HXs shall be electropolished or passivated in accordance with ASTM A967 or material selected properly cleaned for Type I DI water service on the wetted sections of the HXs with hydrogen saturated with deionized water.

Cold side for HXs 6 through 10: hydrogen saturated with deionized water

• Material shall be compatible with deionized water with a conductivity ranging from 1-17 MOhm-cm

• Maximum allowable working pressure (MAWP) shall be > 1087 psi (75 bar)

• An operating pressure of 72.5 psig (5 barg) shall be used for performance criteria calculations

• Pressure drop across the heat exchangers shall be < 1.45 psi (0.1 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• Inlet temperature shall be 46.4°F (8°C)

• Outlet temperature shall be 59°F (15°C)

• Hydrogen flow rate through the HX will be 36.5 kg/hr

(256.37 SCFM)

• The cold side of the HXs shall be electropolished or passivated in accordance with ASTM A967 or material selected properly cleaned for Type I DI water service on the wetted sections of the HXs with hydrogen saturated with deionized water.

o HX 9 & 10:

Hot side: hydrogen saturated with deionized water

• Material shall be compatible with deionized water with a conductivity ranging from 1-17 MOhm-cm

• Maximum allowable working pressure (MAWP) shall be >

1087 psi (75 bar)

• An operating pressure of 72.5 psig (5 barg) shall be used for performance criteria calculations

• Pressure drop across the heat exchangers shall be < 2.9 psi (0.2 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• Inlet temperature shall be 185°F (85°C)

• Hydrogen flow rate through the HX will be 56.25 kg/hr

(395.3 SCFM)

• The hot side of the HXs shall be electropolished or passivated in accordance with ASTM A967 or material selected properly cleaned for Type I DI water service on the wetted sections of the HXs with hydrogen saturated with deionized water.

Cold side for HXs 6 through 10: hydrogen saturated with deionized water

• Material shall be compatible with deionized water with a conductivity ranging from 1-17 MOhm-cm

• Maximum allowable working pressure (MAWP) shall be > 1087 psi (75 bar)

• An operating pressure of 72.5 psig (5 barg) shall be used for performance criteria calculations

• Pressure drop across the heat exchangers shall be < 1.45 psi (0.1 bar)

• Maximum allowable working Temperature (MAWT) shall be > 200°F (93°C)

• Inlet temperature shall be 46.4°F (8°C)

• Outlet temperature shall be 59°F (15°C)

• Hydrogen flow rate through the HX will be 56.25 kg/hr

(395.3 SCFM)

• The cold side of the HXs shall be electropolished or passivated in accordance with ASTM A967 or material selected properly cleaned for Type I DI water service on the wetted sections of the HXs with hydrogen saturated with deionized water.

TECHNICAL OR SAFETY REQUIREMENTS

• Pressure-containing portions of the HX shall be designed to the applicable sections of ASME pressure codes.

• Space Requirements/ Limitations o Installation will be by the NLR research group into an already allocated dedicated space. There are no plans for any subcontracts or operations work for the installation of these heat exchangers.

TIMELINE

• TM: Delivery needed by September 2026 with Delivery in August 2026 preferred