a) Using the method of constant specific heats with the specific heat value that corresponds to the temperature of the start of the compression process (also known as the cold-air standard analysis) determine: i. The pressure and temperature at the end of the compression process. ii. The work per unit mass required for the compression. b) Using the method of variable specific heats determine: The pressure and temperature at the end of the compression process. i. ii. The work per unit mass required for the compression.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Hi, can you please help me with these two questions? I would like to understand what is happening through the schematics first before moving on to the substantive equations. 

Internal combustion engines (ICE) use pistons and cylinders to derive power from a working fluid,
generally a mixture of fuel and air, undergoing a thermodynamic cycle. Though real ICEs are open systems,
it is often convenient to model ICEs by approximating the piston-cylinder assembly as a closed system that
is operating with air. In an ICE, like in the Carnot cycle heat engine, the working fluid undergoes a series
of processes before returning to its initial state. We will spend significant time studying these cycles in
their entirety in Chapter 10. Here, you will focus only on one of the processes of an idealized ICE cycle: an
adiabatic and reversible compression process.
Consider an ICE engine modeled with air as the working fluid. The process of interest is an adiabatic and
reversible compression. The compression process starts at 300 K and 100 kPa and the air is compressed
until its volume is one-tenth of its original volume.
Please answer the following after creating a schematic for the piston cylinder device associated with this
compression process in the engine and a sketch of the process on P-v and T-s diagrams. Do not include
values on the axes, just symbols using subscripts 1 and 2 to denote the initial and final states.
a) Using the method of constant specific heats with the specific heat value that corresponds to the
temperature of the start of the compression process (also known as the cold-air standard analysis)
determine:
İ. The pressure and temperature at the end of the compression process.
ii.
The work per unit mass required for the compression.
b) Using the method of variable specific heats determine:
İ.
ii.
The pressure and temperature at the end of the compression process.
The work per unit mass required for the compression.
Transcribed Image Text:Internal combustion engines (ICE) use pistons and cylinders to derive power from a working fluid, generally a mixture of fuel and air, undergoing a thermodynamic cycle. Though real ICEs are open systems, it is often convenient to model ICEs by approximating the piston-cylinder assembly as a closed system that is operating with air. In an ICE, like in the Carnot cycle heat engine, the working fluid undergoes a series of processes before returning to its initial state. We will spend significant time studying these cycles in their entirety in Chapter 10. Here, you will focus only on one of the processes of an idealized ICE cycle: an adiabatic and reversible compression process. Consider an ICE engine modeled with air as the working fluid. The process of interest is an adiabatic and reversible compression. The compression process starts at 300 K and 100 kPa and the air is compressed until its volume is one-tenth of its original volume. Please answer the following after creating a schematic for the piston cylinder device associated with this compression process in the engine and a sketch of the process on P-v and T-s diagrams. Do not include values on the axes, just symbols using subscripts 1 and 2 to denote the initial and final states. a) Using the method of constant specific heats with the specific heat value that corresponds to the temperature of the start of the compression process (also known as the cold-air standard analysis) determine: İ. The pressure and temperature at the end of the compression process. ii. The work per unit mass required for the compression. b) Using the method of variable specific heats determine: İ. ii. The pressure and temperature at the end of the compression process. The work per unit mass required for the compression.
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