Subject: How can I calculate the cooling of nitrogen as it expands through an orific

If a nitrogen gas cylinder is at 2400 psig reduced to a regulated pressure of 
50 psig and is expanded through an orifice at a rate of 150 liters per minute 
to atmospheric pressure. Can I calculate what the expanded gas temperature 
would be? Where would I find the equations to calculate the above or slightly 
different conditions

Re: How can I calculate the cooling of nitrogen as it expands through an orific