I have to maintain a certain mass (some tons) at 100 K by circulating in it GHe (through apposite channels). How can I calculate the flow rate needed? I suppose that the delta T (T inlet and T outlet) and the heat load on the mass are necessary. Knowing the temperatures I can find the specific enthalpy, and knowing the heat load I can calculate the flow rate. Is that correct?
2 Comments
Robert Johann
August 23, 2012But the T outlet will change with flow rate (approaching T inlet with increasing flow rate)! The heat transferred from the mass to the flow is more complex and depends on geometries, heat capacity, conductivity, flow laminarity/turbulence (Nusselt Number). You have either to simulate your
case or find a formula giving a good approximation (e.g in the “Wärme-Atlas” (German) there are formulas for the heat transfer for many cases).
Marcel ter Brake
August 23, 2012This is an ill-stated problem. The mass is not important but the heat load to that mass. You need to know what heat needs to be absorbed by your helium flow.