Chemical Process- Energy and Processing (thermodynamics), engineering homework help


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Assignment 1 of thermodynamics + chemical process class

Working please (for table values please just note which table used and I will match it up with my own textbook, or references would be great)

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School: UIUC


A closed metal cylinder contains steam at 1 bar and 500 C. how much heat must be removed at constant
volume in order to produce saturated vapor.
Saturated vapor is steam that has not been heated past the boiling point for that pressure.
saturated vapor has a "quality" of 100% and happens at 100oC and 1 atm.,
therefore the temperature change will be 500oC – 100oC = 400
Heat transfer = (mass)(specific heat)(temperature change)
Q = mcΞ”T
Q = heat that need to be removed
m = mass; since the volume remains constant, the mass of the vapor will remain constant (1)
c = specific heat, J/g Β°C, from the steam table = 2.0373
Ξ”T = change in temperature
= 1x 2.0373 x 400 = 814.92 J

Liquid water at 180 C and 1002 kPa has internal energy of 762.0 kJ kg and a specific volume of 1.128

What is its enthalpy?
𝐻=π‘ˆ+𝑃𝑉=762.0 kJkg+(1002.7 kPa)(1.128 cm3g)(1 m100 cm)3(1000 g1 kg)=πŸ•πŸ”πŸ‘.𝟏 𝐀𝐉𝐀𝐠

b) The water is brought to the vapor state at 300 Β°C and 1500 kPa, where its internal energy is
2784.4 kJ/kg and its specific volume is 169.7 cm3/g. Calculate Ξ”U and Ξ”H for the process.

Ξ”π‘ˆ=2784.4 kJkgβˆ’762.0kJkg=𝟐𝟎𝟐𝟐.πŸ’ 𝐀𝐉𝐀𝐠
𝐻2=π‘ˆ2+𝑃2𝑉2=2784.4 kJkg+(1500 kPa)(169.7 cm3g)(1 m100 cm)3(1000 g1 kg)=πŸ‘πŸŽπŸ‘πŸ–.πŸ—πŸ“ 𝐀𝐉𝐀𝐠

Δ𝐻=3038.95 kJkg βˆ’ 763.1 kJkg= πŸπŸπŸ•πŸ“.πŸ— 𝐀𝐉/𝐀𝐠
0.2 of air initially at 0.6 bar and 20 C undergoes the cycle consisting of three mechanically reversible
process. The air is compressed isothermally to a pressure of one bar during the process 1-2.

A heat engine produces energy by taking in 100 Kj/mol of heat from a reservoir at 600K and exhausts
heat to the environment at 300K. What is the maximum work that can be achieved by this engine and the
minimum heat...

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Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

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