A volume of 1.5 m3 of air initially at 1.3 bar and 32 oC undergoes three processes in order to complete a cycle:

Process

1 to 2 Isothermal compression from state 1 through a volumetric compression ratio of 4.4 to state 2

2 to 3 Isobaric heating back to the original volume.

3 to 1 Isochoric cooling back to state1.

Assume for air Mw = 28.96 Cp = 1.005 kJ/kg.K

ALL ANSWERS MUST BE GIVEN TO 3 SIGNIFICANT FIGURES

For this cycle, determine the initial mass of air (15%);

kg

A volume of 1.5 m3 of air initially at 1.3 bar and 32 oC undergoes three processes in order to complete a cycle:

Process

1 to 2 Isothermal compression from state 1 through a volumetric compression ratio of 4.4 to state 2

2 to 3 Isobaric heating back to the original volume.

3 to 1 Isochoric cooling back to state1.

Assume for air Mw = 28.96 Cp = 1.005 kJ/kg.K

ALL ANSWERS MUST BE GIVEN TO 3 SIGNIFICANT FIGURES

For this cycle, determine the initial mass of air (15%);

kg

Find the maximum pressure in the cycle (15%)

kPa

Calculate the maximum temperature in the cycle (15%)

Degrees C

A volume of 1.5 m3 of air initially at 1.3 bar and 32 oC undergoes three processes in order to complete a cycle:

Process

1 to 2 Isothermal compression from state 1 through a volumetric compression ratio of 4.4 to state 2

2 to 3 Isobaric heating back to the original volume.

3 to 1 Isochoric cooling back to state1.

Assume for air Mw = 28.96 Cp = 1.005 kJ/kg.K

ALL ANSWERS MUST BE GIVEN TO 3 SIGNIFICANT FIGURES

For this cycle, determine the initial mass of air (15%);

kg

Find the maximum pressure in the cycle (15%)

kPa

Calculate the maximum temperature in the cycle (15%)

Degrees C

Find the work done during process 1-2 (15%):

kJ

Find the work done during process 2-3 (15%):

kJ

CalcuA volume of 1.5 m3 of air initially at 1.3 bar and 32 oC undergoes three processes in order to complete a cycle:

Process

1 to 2 Isothermal compression from state 1 through a volumetric compression ratio of 4.4 to state 2

2 to 3 Isobaric heating back to the original volume.

3 to 1 Isochoric cooling back to state1.

Assume for air Mw = 28.96 Cp = 1.005 kJ/kg.K

ALL ANSWERS MUST BE GIVEN TO 3 SIGNIFICANT FIGURES

For this cycle, determine the initial mass of air (15%);

kg

Find the maximum pressure in the cycle (15%) low-cost airline operating in South Africa is considering adding either Boeing 737-400 or Boeing 737-800 to its fleet. The following information is prepared for

the economic evaluation. Either aircraft is to be used for 5 years and sold for the estimated salvage value. Assume the double declining balance is used for tax

purposes in this country and the airline’s before-tax MARR is 6.00% per year and the effective tax rate is 35%. Select a machine on the basis of after-tax present

worth analysis.

kPa

Calculate the maximum temperature in the cycle (15%)

Degrees C

Find the work done during process 1-2 (15%):

kJ

Find the work done during process 2-3 (15%):

kJ

Calculate the net work done during the cycle (10%)

kJ

The heat rejected during the Isochoric cooling (15%)

kJ

late the net work done during the cycle (10%)

kJ

The heat rejected during the Isochoric cooling (15%)

kJ

the work done during process 1-2 (15%):

kJ

Find the work done during process 2-3 (15%):

kJ

Calculate the net work done during the cycle (10%)

kJ

The heat rejected during the Isochoric cooling (15%)

kJ

the maximum pressure in the cycle (15%)

kPa

Calculate the maximum temperature in the cycle (15%)

Degrees C

Find the work done during process 1-2 (15%):

kJ

Find the work done during process 2-3 (15%):

kJ

Calculate the net work done during the cycle (10%)

kJ

The heat rejected during the Isochoric cooling (15%)

kJ

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