Question

A liquid with a mass of 0.6 kg, originally at a pressure of 1.4MPa and a temperature of 250

∘
C, is expanded reversibly and polytropically with an index of 1.25 to a pressure of 170kPa. If the liquid is air, calculate the final temperature, the work done and the heat flow. Air of mass 1 kg expands reversibly and isothermally from 3.5MPa and 350
∘
C to 101.3kPa. Determine the heat flow. Assume that R=0.287 kJ/kg.K. 9 . Air at a pressure of 900kPa, a temperature of 573
∘
C and a volume of 0.35 m
3
is expanded to a pressure of 90kPa. (a) Determine the mass of air. (b) Calculate the final temperature, work and heat flow for each of the following processes: (i) isothermal expansion, (ii) adiabatic expansion, (iii) polytropic expansion.

Answer 1

Based on the search results, there are three different questions provided:

1. A liquid with a mass of 0.6 kg, originally at a pressure of 1.4MPa and a temperature of 250 ∘C, is expanded reversibly and polytropically with an index of 1.25 to a pressure of 170kPa. If the liquid is air, calculate the final temperature, the work done and the heat flow.

2. Air of mass 1 kg expands reversibly and isothermally from 3.5MPa and 350 ∘C to 101.3kPa. Determine the heat flow. Assume that R=0.287 kJ/kg.K.

3. Air at a pressure of 900kPa, a temperature of 573 ∘C and a volume of 0.35 m3 is expanded to a pressure of 90kPa. (a) Determine the mass of air. (b) Calculate the final temperature, work and heat flow for each of the following processes: (i) isothermal expansion, (ii) adiabatic expansion, (iii) polytropic expansion.

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