Thermodynamic Cycles: Introduction and Analysis

What is a thermodynamic cycle?

In a thermodynamic cycle, the system experiences a net change of state.

What happens to all properties at the conclusion of a thermodynamic cycle?

What are devices or systems used to produce a net power output often called?

What are thermodynamic cycles that engines operate on called?

What is the purpose of heat engines?

What are devices or systems used to produce refrigeration called?

What is the objective of a refrigeration cycle?

What is the objective of a heat pump?

What does COP stand for?

The net work of a power cycle operating is 10,000 kJ, and the thermal efficiency is 0.4. Determine the heat transfer $Q_{in}$ in kJ.

A refrigeration cycle operating has $Q_{out}$ = 1000 Btu and $W_{cycle}$ = 300 Btu. Determine the coefficient of performance for the cycle.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series. Determine the volume at state 1 in m3, if the volume at state 3 is 0.028 m3 and the work is -8.3 kJ.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series. Determine the work for process 1-2, each in kJ, if the volume at state 3 is 0.028 m3 and the work is -8.3 kJ.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series. Determine the heat transfer for process 1-2, each in kJ, if the volume at state 3 is 0.028 m3 and the work is -8.3 kJ.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series. Can this be a power cycle or a refrigeration cycle?

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series, beginning at state 1 where $p_1$ = 1 bar, $V_1= 1.5 m^3$, as follows: Process 1-2: Compression with $pV = constant, W_{12} = -104 kJ, U_1 = 512 kJ, U_2 = 690 kJ$. Process 2-3: $W_{23} = 0, Q_{23} = -150 kJ$. Process 3-1: $W_{31} = +50 kJ$. Determine $Q_{12}$ in kJ.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series, beginning at state 1 where $p_1$ = 1 bar, $V_1= 1.5 m^3$, as follows: Process 1-2: Compression with $pV = constant, W_{12} = -104 kJ, U_1 = 512 kJ, U_2 = 690 kJ$. Process 2-3: $W_{23} = 0, Q_{23} = -150 kJ$. Process 3-1: $W_{31} = +50 kJ$. Is this a power cycle? Explain.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Compression with $pV = constant$, from $p_1$ = 1 bar, $V_1 = 2 m^3$ to $V_2 = 0.2 m^3$, $U_2 - U_1 = 100 kJ$. Process 2-3: Constant volume to $p_3$ = $p_1$. Process 3-1: Constant-pressure and adiabatic process. Determine the net work of the cycle, in kJ.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Compression with $pV = constant$, from $p_1$ = 1 bar, $V_1 = 2 m^3$ to $V_2 = 0.2 m^3$, $U_2 - U_1 = 100 kJ$. Process 2-3: Constant volume to $p_3$ = $p_1$. Process 3-1: Constant-pressure and adiabatic process. Determine the heat transfer for process 2-3, in kJ.

A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Compression with $pV = constant$, from $p_1$ = 1 bar, $V_1 = 2 m^3$ to $V_2 = 0.2 m^3$, $U_2 - U_1 = 100 kJ$. Process 2-3: Constant volume to $p_3$ = $p_1$. Process 3-1: Constant-pressure and adiabatic process. Is this a power cycle or a refrigeration cycle?