Thermo Final

What cycle is this

Refrigeration/ Heat Pump

What cycle is this

Otto

What cycle is this

Diesel

What cycle is this

Dual

Heat can’t transfer from cold to hot

Clausius statement

Impossible for cycle to output same Work as Q(in)

Kelvin Planck Statement

Entropy can be destroyed (T/F)

False

When can boundary work be used

Closed system

Boundary Work (PV^n constant)

Boundary Work (T constant)

Boundary Work (P constant)

When can flow work be used

Open system, steady state, steady flow, reversible

Reversible Flow Work (PV^n constant)

Reversible Flow Work (T constant)

Reversible Flow Work (V constant)

Work done on on the system

W<0

Work done by the system

W>0

Energy into the system

Q>0

Energy out of the system

Q<0

If compression ratio increases, doe thermal efficiency increase or decrease

Increase

Produces work by deacreasing h and P

Turbine

Uses work to increase P and h for compressible fluids

Compressor

Uses work to increase P and h for incompressible liquids

Pump

Increases velocity at expense of pressure (Q=0, W=0)

Nozzle

Decreases velocity by increasing pressure (W=0, Q=0)

Diffuser

Two streams exchange heat without mixing (W=0, Q=0)

Heat exchanger (ex. condenser, evaporator)

Restricts flow to cause pressure drop (W=0, Q=0, h constant)

Throttling valve

A reversible and adiabatic process is ___

Isentropic