Solution Found!
Repeat 2.48 with carbon dioxide, condenser at +20°C and
Chapter 2, Problem 50HP(choose chapter or problem)
Problem 50HP
Repeat Problem 2.48 with carbon dioxide, condenser at +20°C and evaporator at −30°C.
Problem 2.48
In your refrigerator, the working substance evaporates from liquid to vapor at −20°C inside a pipe around the cold section. Outside (on the back or below) is a black grille, inside of which the working substance condenses from vapor to liquid at +45°C. For each location, find the pressure and the change in specific volume (v) if the substance is ammonia.
Questions & Answers
QUESTION:
Problem 50HP
Repeat Problem 2.48 with carbon dioxide, condenser at +20°C and evaporator at −30°C.
Problem 2.48
In your refrigerator, the working substance evaporates from liquid to vapor at −20°C inside a pipe around the cold section. Outside (on the back or below) is a black grille, inside of which the working substance condenses from vapor to liquid at +45°C. For each location, find the pressure and the change in specific volume (v) if the substance is ammonia.
ANSWER:
Solution 50 HP
Step 1 of 2
We have to find the pressure and the change in the specific volume(v) of carbon dioxide condensing from vapor to liquid at +20 oC and evaporating from liquid to vapor at -30 oC.
The pressure and change in the specific volume of carbon dioxide condensing from vapor to liquid at +20 oC can be found from the Table B.3.1
Therefore, the pressure and the change in specific volume () of carbon dioxide condensing from vapor to liquid at +20 oC c are 5729.1 kPa and 0.00386 m3/kg.