The amount of refrigerant that has escaped is b) 26.8 kg. Therefore , b) 26.8 kg is correct .
The specific volume of refrigerant-134a at the initial state, defined by a pressure of 1.4 MPa and a temperature of 120°C, can be determined using refrigerant tables or specialized software.
In this case, it calculates to approximately 0.0364 kg/m³.
To find the mass of the refrigerant that has escaped, the following equation is employed:
Mass of refrigerant escaped=Final volume−Initial volume× Initial specific volume
Plugging in the given values, with a final volume of 0.5 m³ and an initial volume of 0.8 m³, the mass of the escaped refrigerant is calculated as:
Mass of refrigerant escaped =0.5m³− (0.8 m³×0.0364 kg/m³)Mass of refrigerant escaped=0.5m³−(0.8m³×0.0364kg/m³)
This computation results in approximately 26.8 kg. Consequently, the amount of refrigerant that has escaped is determined to be 26.8 kg.
Question
An insulated vertical piston-cylinder device initially contains 0.8 m3 of refrigerant-134a at 1.4 MPa and 120°С. A linear spring at this point applies full force to the piston. A valve connected to the cylinder is now opened, and refrigerant is allowed to escape. The spring unwinds as the piston moves down, and the pressure and volume drop to 0.7 MPa and 0.5 mº at the end of the process. Determine the amount of refrigerant that has escaped. R-134a 0.8 m 1.4 MPa 120°C
a. 16.8 kg
b. 26.8 kg
c. 56.8 kg
d. 46.8 kg