Thermo Final Exam Processes Flashcards
Process 1 - 2 - Vapor expands through the turbine developing work.
Process 2 - 3 - Vapor condenses to liquid through heat transfer to cooling water.
Process 3 - 4 - Liquid is pumped into the boiler requiring work input.
Process 4 - 1 - Liquid is heated to saturation and evaporated in the boiler through heat transfer from the energy source.
Rankine Cycle
Process 1 - 2 - Isentropic expansion through the turbine.
Process 2 - 3 - Heat transfer from the working fluid passing through the condenser at constant pressure.
Process 3 - 4 - Isentropic compression in the pump.
Process 4 - 1 - Heat transfer to the working fluid passing through the boiler at constant pressure.
Ideal Rankine Cycle
Process 1 - 2 - Isentropic compression.
Process 2 - 3 - Constant-volume heat addition to the air from an external source.
Process 3 - 4 - Isentropic expansion.
Process 4 - 1 - Constant-volume heat transfer from the air.
Otto Cycle
Process 1 - 2 - Isentropic compression.
Process 2 - 3 - Constant pressure heat addition to the air from an external source.
Process 3 - 4 - Isentropic expansion.
Process 4 - 1 - Constant volume heat transfer from the air.
Diesel Cycle
Process 1 - 2 - Isentropic compression.
Process 2 - 3 - Constant-volume heat addition to the air from an external source.
Process 3 - 4 - Constant-pressure heat addition to the air from an external source.
Process 4 - 5 - Isentropic expansion.
Process 5 -1 - Constant-volume heat transfer from the air.
Dual Cycle
Process 1 - 2 - Isentropic compression of air flowing through the compressor.
Process 2 - 3 - Heat transfer to the air as it flows at constant pressure through the higher temperature heat exchanger.
Process 3 - 4 - Isentropic expansion fo the air through the turbine.
Process 4 - 1 - Heat transfer from the air as it flows at constant pressure through the lower - temperature heat exchanger.
Brayton Cycle
Process 4 - 1 - Two-phase liquid vapor mixture of refrigerant is evaporated through heat transfer from the refrigerated space.
Process 1 - 2 - Vapor refrigerant is compressed to a relatively high temperature and pressure requiring work input.
Process 2 - 3 - Vapor refrigerant condenses to liquid through heat transfer to the cooler surroundings.
Process 3 - 4 - Liquid refrigerant expands to the evaporator pressure.
Vapor Compression Refrigeration Cycle
Process 1 - 2 - The refrigerant gas enters the compressor at state 1 and is compressed to state 2.
Process 2 - 3 - The gas is cooled by heat transfer to the warm region at temperature TH
Process 3 - 4 - The gas expands through the turbine to state 4, where T4 is well below Tc.
Process 4 - 1 - Refrigeration of the cold region is achieved through heat transfer from the cold region to the gas as it passes from state 4 to state 1.
Brayton Refrigeration Cycle