1. A steam engine boiler is maintained at 250°C and water is converted into steam. This steam is used to do work and heat is ejected to the surrounding air at temperature 300K. Calculate the maximum efficiency it can have?
Answers
Answer:
click the attachment
hope it helps you
Answer:
The maximum efficiency it can have is 42.6%
Explanation:
Carnot Engine:
- It's a theoretical engine that works on the principle of Carnot's Cycle.
- The efficiency of this engine depends only on the temperature of the source() and sink().
- Its efficiency() is given by
Step 1:
Given that, the Steam engine boiler is maintained at , which is the temperature of the source. It is also given that heat is ejected at a temperature of , which is the temperature of the sink.
Step 2:
The source temperature is in degree Celsius which has to be converted to Kelvin scale. The conversion is given by
where is the temperature in the Kelvin scale and is the temperature in the Celsius scale.
Therefore, converting to Kelvin scale we get,
Step 3:
Substituting the temperature values in the formula for Efficiency we get,
Step 4:
It is sensible to write efficiency in per cent. Therefore,
Therefore, the maximum efficiency of the steam engine boiler operating between and 300K is 42.6%