Chapter4-He vs Ref. cycle

Explain the schematic diagram of a refrigeration cycle.

• The schematic diagram of a refrigeration cycle includes a toaster, microwave, and blender.

• The schematic diagram of a refrigeration cycle includes a compressor, condenser, expansion valve, and evaporator.

• A refrigeration cycle consists of a vacuum cleaner, ceiling fan, and air purifier.

• In a refrigeration cycle, the components are a stove, dishwasher, and washing machine.

What are the main processes involved in a turbine?

• ØLow pressure liquid water fed into pump

• Turbine exhaust enters condenser at state 4, where heat is removed, and steam condenses to the liquid condition

• Turbine extracts energy from flowing fluid and produces work during process for rotating an electrical power generator

• heat is added and liquid water is vaporized at constant pressure until water changes into  superheated vapor

Derive the equation for the coefficient of performance (COP) of a refrigeration cycle.

• COP = Qh / Win

• COP = QL - Wout

• COP = QL / Win

• COP = Qc * Win

Describe the thermodynamic cycle.

• To determine quality as well as degree of degradation of energy during process

• Concern with quantity of energy & transformations of energy from one form to another

• The working principle of a Carnot cycle involves reversible adiabatic and isothermal processes to achieve maximum efficiency in converting heat into work.

• When system undergoes series of processes and returns to its original state

What is the equation for the efficiency of a heat engine cycle?

• efficiency = 1 - (Qout/Qin)

• efficiency = Qout/Qin

• efficiency = Wnetout/QL

• efficiency = Th - Tc

Discuss the role of the evaporator and condenser in a refrigeration cycle.

• The evaporator absorbs heat and evaporates the refrigerant, while the condenser releases heat and condenses the refrigerant.

• The evaporator releases heat and condenses the refrigerant.

• The condenser absorbs heat and evaporates the refrigerant.

• The evaporator and condenser are interchangeable in the refrigeration cycle.

Explain the concept of refrigeration cycle?

• Heat moves from a high-temperature is less than refrigeration.

• Device to transfer heat from low -temperature medium to a high-temperature

Calculate the work done by a refrigeration cycle if the heat absorbed is 500 J and the heat rejected is 300 J.

• 400 J

• 800 J

• 100 J

• 200 J

Compare and contrast the ideal and actual performance of a refrigeration cycle.

• The ideal performance of a refrigeration cycle is characterized by reversible processes with no energy losses, while the actual performance involves irreversible processes and energy losses due to various inefficiencies.

• The ideal performance involves irreversible processes and energy losses, while the actual performance is characterized by reversible processes with no energy losses.

• Both ideal and actual performance of a refrigeration cycle have no energy losses.

• The actual performance of a refrigeration cycle is more efficient than the ideal performance.

What components are there in schematic diagram of heat engine cycle?

• Pump, Boiler, compressor, Turbine

• Pump, Condenser, compressor, Turbine

• Pump, Boiler, Turbine, evaporator

• Pump, Boiler, Turbine, condenser