What is the specific volume of R-134a at 20°C and 730 kPa? What is the internal energy at that state? Use data from the steam tables.

Specific volume = 8.16 × 10⁻⁴ m³/kg

Internal energy = 78.85 KJ/kg

Explanation:

At the conditions provided, refrigerant-134a (1,1,2,2 - Tetrafluoroethane) is a very compressed liquid. We know this because its boiling point is -26.3°C (So, at 20°C, it's a liquid) and at 730 KPa, this very high pressure will definitely compress it.

In the steam tables, there are no outright readings for super compressed liquids, but the behaviour of a saturated liquid at those stated conditions approximates what we want. So, checking under saturated liquid, the specific volume was obtained to be 0.000816 m³/kg and the internal energy, 78.85 KJ/kg.

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