Recent content by hashsback

Hello Q_Goest I have acquired a database for retrieving the Cp value for various temperatures and pressures. It seems sufficient for my work. Although I would love to have an extensive database like REFPROP, this was a one time project for me, my Phd work is related to another topic...

Good morning folks Sorry for the rather big break. Just got back some experimental results. As expected, 1. the tank depressurisation results in cooling of hydrogen 2. the pipe leading hydrogen to the pressure regulator is a bit warmer due to heat exchange with environment 3. the...

Thanx for the tips guys CS... I will look into the Redlich-Kwong equations of state. Q_Goest The next logical step would be to update the temperature of the system at every time step taking into consideration the heat transfer between the inner walls of the tank and the hydrogen in the...

Thanx a bunch, ofcourse this discussion helps me a lot. Once I start modelling the situation, it gets better with time. All I needed was a place to start. What do you think of my approach? 1) I get the density of the system via Van der Waals at t=0 2) Calculate the loss of volume for one time...

Wow I m impressed :-) Ok yesterday I took a good look at the H2 tank, and all the instrumentation and will possibly test it in detail next week or so. We have a heat sensor inside the tank, also a pressure sensor. As we release H2 at about 2 g/s, pressure drops gradually from about 200 bar...

Hi Q_Goest While I realize the pain in setting model equations from thermodynamics, I have absolutely no access to Hydrogen databases and hence no choice. I have no trouble modelling heat and mass transfer for the H2 tank, but I atleast need a simplified set of equations describing the...

Q_Goest Thanks for your reply I can imagine such a system isn't trivial to model. I can handle the heat transfer between the walls of the tank and the gas inside and other surrounding effects. Whats is required though is the equation for estimating the temperature of the hydrogen in the tank...

Hello all I wish to simulate hydrogen flow from a high pressure tank 700 bar down to 11 bar via a Pressure relief valve. In practice we notice the hydrogen tank cooling (starting from room temperatures) down drastically as well as the relief valve. My task is to simulate the cooling effect...