Is the cooling effect of circulating water for hydrogen the same as that for nitrogen?
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During the trial operation phase of my hydrogen deoxygenation unit, since hydrogen had not yet been introduced, temporary pipelines were used, with nitrogen serving as the feed gas for the trial operation. I would like to ask whether cooling hydrogen with the same circulating water has the same effect as cooling nitrogen with that same circulating water Because during the trial operation period, the secondary intake temperature exceeded the allowable limit. If it is used for circulating cooling of hydrogen, will overheating not occur?
It’s definitely different; when using a hydrogen compressor to compress nitrogen, the maximum pressure that can be achieved is 4.0 MPa, and the main reason for this is the difficulty in lowering the temperature after compression.
They are different; the heat capacity, compressibility factor, and adiabatic coefficient are all distinct. Under the same flow rate and discharge pressure, the discharge temperature varies
Look at how much the specific heat differs; there is also a large difference in the mass flow rates of the two. All of these factors need to be taken into account
One is specific heat capacity, and the other is density. Nitrogen has a higher density than air and hydrogen; when a cooler uses an inlet at the bottom and an outlet at the top, cooling nitrogen is more effective than cooling hydrogen!
The heat capacity of hydrogen should be lower than that of nitrogen; under the same pressure and temperature, hydrogen requires less cooling water
Both the thermal conductivity and specific heat capacity at constant mass of hydrogen are about an order of magnitude higher than those of nitrogen; therefore, under similar pressures, its heat transfer efficiency will definitely be better than that of nitrogen. Moreover, at the same compression ratio, the temperature rise during compression is significantly lower for hydrogen compared to nitrogen.