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Confidential Draft Hydrogen Fueling Station Performance Validation Testing—DO NOT CITE OR QUOTE <br /> HyStEP Summary Test Report for Linde—Mobile Refueler Hydrogen Station Updated Revision Date:September 29,2023 <br /> d. In an attempt to resolve the fuel temperature faults, station operator changed fuel delivery temperature <br /> (Tfuel) monitoring method from the instantaneous fuel delivery temperature (Tfuel-inst)to total mass average <br /> fuel delivery temperature (Tfuel-ave) during testing AND verified that fuel temperature was allowed to be <br /> outside the tolerance during the first 15 sec of main fueling time. These changes did not resolve the fuel <br /> delivery temperature issue because the fuel delivery temperature was consistently more than 5 <br /> degrees C above ambient temperature for entire fills. <br /> e. Dispenser was programmed to compare ambient temperature in Celsius to fuel temperature in Kelvin, <br /> resulting in a fault. This was fixed during testing. <br /> 14. Issues during testing that were not resolved onsite: <br /> a. Fuel delivery temperature was consistently greater than 5 degrees C above the ambient temperature, <br /> which is not allowed in the 2010 SAE J2601 TIR. Bennett needed to disable enforcement of this <br /> requirement for fueling tests to continue. This may not be an issue because for HD fueling Linde plans to <br /> use the ambient fueling tables from the Clean Energy Partnership, which allow greater fuel temperature <br /> tolerance to account for the Joule-Thomson effect. <br /> Type D:Ambient T; -5.00 mass ave. tolerance; +5.00 mass average tolerance over any 30 s period <br /> The dispenser cooling temperature TFue,should be in the tolerance window within 15 s after start of fueling. <br /> Linde comment: During testing, the measured gas temperature was greater than 5C above the <br /> ambient measurement due to solar radiation of the piping. This issue could not be solved during <br /> testing, so Linde had Bennett disable the tolerance enforcement during filling. Linde is currently <br /> developing engineering controls to minimize the impact of solar radiation on the interconnecting piping <br /> to allow this tolerance enforcement to be reenabled. <br /> b. The dispenser did not consistently enforce the lower APRR pressure tolerance during testing. <br /> Additionally, the dispenser did not log intended non-fueling time during fueling, although pauses in flow <br /> for extended periods did occur. <br /> Bennett comment: see item 13 comment. <br /> c. The dispenser appears to calculate target pressure and APRR throughout the fill, whereas these values <br /> should be calculated based on the initial pressure and initial ambient temperature. <br /> Bennett comment: The station logic will be revised to calculate the target pressure and APRR once after <br /> the initial connection pulse and then possibly a second time if IR communications is lost (see item 11 <br /> response). <br /> 6 <br /> Page 15 of 38 <br />