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Thermodynamics 1 DEN107: Tutorial 7 (Due Week 9, Fri 2010mar12)

This document provides 6 thermodynamics problems from a tutorial on the topic. Students are asked to work through examples from their notes calculating theoretical work output or input for processes involving the flow of air as a perfect gas between given inlet and outlet temperature and pressure conditions. They are to sign confirming their own work and attendance before the teaching assistant signs off. Problems ask students to predict if the theoretical work will be positive or negative based on the given inlet and outlet conditions.

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106 views1 page

Thermodynamics 1 DEN107: Tutorial 7 (Due Week 9, Fri 2010mar12)

This document provides 6 thermodynamics problems from a tutorial on the topic. Students are asked to work through examples from their notes calculating theoretical work output or input for processes involving the flow of air as a perfect gas between given inlet and outlet temperature and pressure conditions. They are to sign confirming their own work and attendance before the teaching assistant signs off. Problems ask students to predict if the theoretical work will be positive or negative based on the given inlet and outlet conditions.

Uploaded by

Ramb23
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Thermodynamics 1 DEN107

Tutorial 7 (due week 9, Fri 2010mar12)


Insert the SEMS homework coverpage as 1st page; this question sheet with original signatures as the 2nd page; then attach your solutions in subsequent pages. Your solutions are due before 3.30 pm on Friday March 12th 2010 in the cabinet outside the SEMS oce. By signing below I certify that I will not obtain the teaching assistants (TA) signature for students other than myself, and that I will not forge the TAs signature on this page. Violators will be prosecuted in accordance to QMUL procedures. Please ll in the ve items below. Student Surname: Student Forenames: Student ID (9 digits): Student signature: TA conrms tutorial attendance (signature): 50% of the assignment grade will be deducted if the TA signature above is missing
Problem (1) Do as an example the theoretical section shown on page 92 of the notes for the following conditions: Assume that the gas owing is m = 10 kg of air, which you can model as a perfect gas with specic heat capacity at constant pressure Cp = 1003.00 kJ/(kg.K) and specic gas constant R = 286.96 kJ/(kg.K). Assume the environment is at To = 298 K and po = 101.32 kPa. Use T0,1 = 1, 000 K, p0,1 = 1010.00 kPa, T0,2 = 400 K, and p0,2 = 202.64 kPa. Problem (2) Do as an example the theoretical section shown on page 92 of the notes for the following conditions: Assume that the gas owing is m = 20 kg of air, which you can model as a perfect gas with specic heat capacity at constant pressure Cp = 1005.00 kJ/(kg.K) and specic gas constant R = 286.96 kJ/(kg.K). Assume the environment is at To = 298 K and po = 101.32 kPa. Use T0,1 = 600 K, p0,1 = 500 kPa, T0,2 = To K, and p0,2 = po . (Note the inlet conditions are above atmopsheric, the outlet conditions are atmospheric, and that this corresponds to the theoretical section of page 93. Do you expect the answer to be positive or negative in this problem?) Problem (3) Do as an example the theoretical section shown on page 92 of the notes for the following conditions: Assume that the gas owing is m = 20 kg of air, which you can model as a perfect gas with specic heat capacity at constant pressure Cp = 1005.00 kJ/(kg.K) and specic gas constant R = 286.96 kJ/(kg.K). Assume the environment is at To = 298 K and po = 101.32 kPa. Use T0,1 = 200 K, p0,1 = 50 kPa, T0,2 = To K, and p0,2 = po . (Note the inlet conditions are below atmopsheric, the outlet conditions are atmospheric, and that this corresponds to the theoretical section of page 93. Do you expect the answer to be positive or negative in this problem?) Problem (4) Do example 2 page 110 of notes. Problem (5) Do example 3 page 111 of notes for p0,2 /p0,1 = 3.0. Problem (6) Do example 4 page 112 of notes for T0,2 = 900 K and p0,2 = 700 kPa.

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