# AP3004 Course Materials

## Note

### Chapter One

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## Assignments

### Chapter One

#### 1.2. A unit mass of dry air undergoes a Carnot cycle consisting of the following steps:
(a) adiabatic compression from 60 kPa and O°C to a temperature of 25°C;
(b) isothermal expansion to a pressure of 70kPa;
(c) adiabatic expansion to a temperature of O°C;
(d) isothermal compression to the original pressure of 60kPa.
Calculate the work done by the air in this process. Confirm your result using the tephigram or another meteorological thermodynamic chart.

#### 1.5. The specific enthalpy of a gas is defined by $h = u + p\alpha$.
(a) Prove that $dh$ for an ideal gas is an exact differential.
(b) Calculate the change in enthalpy of a unit mass of dry air as it is compressed adiabatically from an initial pressure of 70 kPa and temperature of 10°C to a final pressure of 100 kPa.

#### 1.6. A 200-gram sample of dry air is heated isobarically. Its entropy increases by 19.2 11K a~d the work done by expansion is 1.61 x 103 J. Solve for the final temperature of the au.

### Chapter Two

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## Past Exam