A strange thing happened, my heat exchanger cold fluid (H2) inlet is at 22K, while the hot fluid inlet is at 360K. The cold fluid is H2, and I used NIST real gas, but without using tables, so there shouldn't be any limitations on the range of property parameters. However, in the calculation, it shows that the temperature has dropped to 13.939K. I expected the cold fluid to start heating up from 22K, so how could it drop below 22K? I'm puzzled that NIST doesn't seem to work well. Could you please provide me with a polynomial property equation for H2? Thank you."
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