Problem $4(10$ points$)-$ Energy Balance with R$-134$a

A large rigid tank is $0\mathrm{.}5m^3$ in size contains $29$ kg of $R-134a.$ This tank is

initially stored in a cool environment $($e$.$g$.$ air conditioned building$)$ and

the $R-134$ a pressure is $700$ kPa $.$ The tank is then placed outdoors for pick$-$

up by a shipping company. Due to a combination of direct sunlight heating

and hotter outdoor environment, the temperature of the R$-134$a

increases to a steady$-$state temperature of $60$ Celsius. You may assume that changes in kinetic and

potential energy in this problem are negligible.

a$)$ Use the property tables for R$-134$a to determine the initial temperature of the R$-134$a when it

was stored in a cool environment. Indicate the phase of the R$-134$a and what table you used $($e$.$g$.,$

Table A$-56)$

b$)$ Determine the pressure of the R$-134$a when it outdoors in the hot environment. Indicate the

phase of the R$-134$a and what table you used. Note: This problem requires linear interpolation of

the R$-134$a tables. Show your work for this linear interpolation $($i$.$e$.$ don$$t simply use an

online$/$electronic linear interpolation tool$).$ You should not need bilinear interpolation for this

problem.

c$)$ Calculate the heat transfer that occurred to raise the R$-134$a temperature to $60$ Celsius. Indicate

the heat as a positive number that is either $"$in$"$ or "out". Note: This problem requires linear

interpolation of the R$-134$a tables. Show your work for this linear interpolation $($i$.$e$.$ don$$t simply

use an online$/$electronic linear interpolation tool$).$ You should not need bilinear interpolation for

this problem