Liquid nitrogen is stored in a thin-walled spherical vessel of diameter Di = 1 m. The vessel is positioned concentrically within a larger, thin-walled spherical container of diameter Do = 1.10 m and the intervening cavity is filled with atmospheric helium.

Under normal operating conditions, the inner and outer surface temperatures are Ti = 77 K and To = 283 K. If the latent heat of vaporization of nitrogen is 2 x 105J/kg, what is the mass rate liz (kg/s) at which gaseous nitrogen is vented from the system?

Transcribed Image Text:

Gaseous nitrogen -Atmospheric helium D, T Do, To Liquid nitrogen