Reference no: EM131559200

Qno 1. A piston-cylinder device has 0.3 m³ of saturated liquid R-134a at 700kPa in the beginning. R-134a is then heated to achieve 90^o C temperature while maintaining the pressure. Determine the Work Done.Units of answer should be kJ.

Qno 2. A piston-cylinder deviceencloses 7.5 kg of R-134a at a pressure of 900 kPa and temperature of 80^o C initially. It is then cooled to 10^o C (until it becomes a liquid) keeping the pressure constant. Calculate the heat loss and plot the respective Temperature- Volume curve.

Qno 3. Hydrogen is being heated from 26.85^o C to 326.85^o C . Find its change in internal energy in kJ/kg. Solve using
(a) c_v (T)
(b) c_v at average temperature
(c) c_v at room temperature

Qno 4. A piston-cylinder encloses 0.68 kg of carbon dioxide gas at 200 kPa and 400 K. A polytropic process compresses the gas until V₂=0.5 V1₁. PV^1.3 = k during the process, where k is a constant. Find the work done and the heat transfer.

Qno 5.

Determine the enthalpy of liquid water at 200°C and 2000 kPa by

(a) Compressed liquid tables (is this exact?)

(b) Saturated liquid approximation. Also find error.

(c) Using :

h_@P,T ≅ h_f@T + V_f@T(P-P_sat@T)

Also find error.

(d) Compare both errors in (c) and (d).