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patriot [66]
3 years ago
5

Two kilograms of air within a piston–cylinder assembly executes a Carnot power cycle with maximum and minimum temperatures of 80

0 K and 295 K, respectively. The heat transfer to the air during the isothermal expansion is 60 kJ. At the end of the isothermal expansion the volume is 0.4 m3. Assume the ideal gas model for the air. Determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kJ.

Engineering
2 answers:
Alekssandra [29.7K]3 years ago
6 0

Answer:

a.) Thermal efficiency = 0.37

b.) Volume = 0.229 m^3

c.) Work done = 1393.3 kJ

Explanation: Please find the attached files for the solution

creativ13 [48]3 years ago
6 0

Answer:

thermal efficiency, η=  0.63125

volume at the beginning of the isothermal expansion, V1 = 0.34011 m3

work during the adiabatic expansion, in kJ = 766.59 KJ

Explanation:

<u>To determine the thermal efficiency</u>

The thermal efficiency of a heat engine gives an estimation of the amount of heat energy converted to work in the engine.

Thermal efficiency is given by: η= 1-  (Tc/Th)

where, Tc= ambient temperature or the minimum temperature

            Th=  maximum temperature

from the given data:

minimum temperature = 295 K

maximum temperature =  800 K

η= 1-  (295/800)

η=  0.63125

<u>To determine the volume at the beginning of the isothermal expansion, in m3</u>

We know,  ΔU = Q − W.

where,  ΔU is the change in internal energy of the system.

Q= mRT In (V2/V1)

Where, V1 = volume at the beginning of the isothermal expansion

             V2 = = volume at the end of the isothermal expansion

Therefore, V1 = V2 / (Q/mRT)

V1= 0.4/ ((60000/ (2 x 287 x 800))

V1 = 0.34011 m3

where, isothermal expansion given is 60 kJ

             isothermal expansion the volume given is 0.4 m3

<u>To determine the work during the adiabatic expansion, in kJ.</u>

Work during the adiabatic process is given by

W = − ΔU

where,  ΔU is the change in internal energy of the system

W at the first and second process = - 2 x 759 ( 295 - 800)

= 766590J = 766.59 KJ

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Answer:

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2. Using the first letter of the last name, locate the appropriate alphabetical section in which the name should appear.

3. Using the second letter of the last name, find the subsection of first and second letters combined, in the appropriate order, in which the name should appear. (If the last name consists of only two letters, find the appropriate first name.)

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5. Begin the second step using the first letter of the first name, but limit the section to only those exactly matching the last name. Continue to step 4, again focusing on the first name only within the set of exactly matching last names.

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dia. of nozzle \left ( d\right )=2 cm

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raketka [301]

Answer:

a) 53 MPa,  14.87 degree

b) 60.5 MPa  

Average shear = -7.5 MPa

Explanation:

Given

A = 45

B = -60

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