The Hysys simulation of hydrogen filling (hydrogen refueling station) does not match reality
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Hello everyone. The hydrogen filling simulation was carried out based on https://bbs.hcbbs.com/thread-2746245-1-1.html; it is a simple simulation of the temperature increase in a vehicle’s storage tank due to hydrogen filling at a hydrogen station. But why does the temperature decrease during the pressurization process, as calculated? Does anyone who is an expert know what’s going on? Is it that Aspen HYSYS doesn’t have parameters for hydrogen?
It seems like the chances of you making a mistake are a bit higher :)
I took a look at the trend you simulated; indeed, during the hydrogen pressurization process the temperature decreases. What’s going on here? Did I make a mistake in the calculations?
Was the process of reducing the pressure of high-pressure hydrogen also taken into account?
There’s one thing I’m not entirely sure about: in the actual process, when oil is throttled through a valve, there should be a rise in temperature, and then when it enters the storage tank to be pressurized, there should also be a rise in temperature, right?
I was in Shanghai occasionally and happened to come across your question... Hydrogen is different from light hydrocarbons; its molecules are very small. During the pressure release process, in addition to the PV=nRT relationship, the rapid expansion does work, which causes the temperature to rise sharply... At this point, volume work plays a dominant role... This is why natural gas requires a heater, while hydrogen instead needs a cooler. The modified PV Work can achieve the desired temperature rise effect. Due to time constraints, I won’t go into details; you can search for the PV Work section in the help documents – you should be able to figure out how to do it……
Because hydrogen throttling causes a temperature rise, which is the J-T effect; conversely, it causes a temperature drop. But there is a prerequisite, and that is an approximately isenthalpic process; clearly, a compression process is not an isenthalpic process. Without seeing your model, it’s impossible to give a precise answer.
People who stop speaking halfway are the most annoying; P
Did the original poster notice the problem? I also obtained the same results as you recently