At what pressure ratio does a Brayton cycle using a monatomic gas have an efficiency of ?
The pressure ratio using a monatomic gas,
The Brayton cycle is a thermodynamic cycle that works on the basis of constant pressure process . It involves four operation , like isentropic compression , constant pressure heat addition , isentropic expansion and constant pressure heat rejection. It is mostly used in gas turbine power plants.
The performance of a Brayton engine operating at a compression ratio of r with a gas of heat capacity ratio of is calculated as follows:
Simplify as follows.
Therefore we have
The value of for air is 1.4 . Efficiency is 50% hence
The ratio is given by
A heat engine uses a diatomic gas that follows the cycle in FIGURE P.
a. Determine the pressure, volume, and temperature at point
b. Determine , and
for each of the three processes. Put your results in a FIGURE P table for easy reading.
c. How much work does this engine do per cycle and what is its thermal efficiency?
A -efficient electric power plant produces of electric power and discharges waste heat into ocean water. Suppose the waste heat could be used to heat homes during the winter instead of being discharged into the ocean. A typical American house requires an average of for heating. How many homes could be heated with the waste heat of this one power plant?
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