15) What is the Eutectic Temperature for the system?

Liquid nitrogen of 10 lbm mass is located inside the container under the 350psi pressure at the saturated liquid stage. It was a hot day and the technician forgot to take the container to the lab. The pressure was gradually increased due to heating the container. At some time, the technician noticed the pressure gage reading is increased to 450 psi and he rushed to hide the container to the lab to cool it down. Draw the process using the phase envelop in T-V scale. Show all stages and denote by arrow the process. Using NIST webbook determine: The initial density of the liquid nitrogen in kg/m3.                                         The volume in m3 of the liquid nitrogen inside the container.                  The initial temperature in C inside the container.               What is the temperature in C at 450psi?                                                       Is nitrogen still at the liquid stage?   Why do you think so?

Roughly how many tons of cooling does it take to cool a space where the following equipment is stored but no people? The equipment is running continuously: 3 refrigerators - capacity, 3000 Watts each; 10 Fluorescent lights - 64 Watts each; Two copy machines - 1000 Watts each a. 3.5 tons, b. 10 tons, c. 1 ton, d. 0 tons, there is no need to cool equipment.

11-A piston-cylinder assembly initially contains refrigerant-134a (R-134a) at a pressure of 0.8 MPa and a temperature of 60°C. In the system where the piston can move freely, the temperature of R-134a is reduced to 32°C.Which of the following diagrams correctly represents the process?