Final answer:
A dirty blower will decrease the efficiency of a system due to decreased airflow, hampering heat exchange and increasing energy requirements. Therefore correct answer is option b.
Step-by-step explanation:
A dirty blower in any system will tend to decrease its efficiency due to decreased airflow. When the blower is coated in dirt and debris, it requires more energy to push air through the system, which reduces the overall system efficiency. Furthermore, the accumulation of dirt can impede the heat exchange process, causing the system to work harder to maintain the desired temperature.
The quality by which air conditioners are judged is generally based on the amount of energy transferred by heat from a hot environment, compared with the required work output. In the context of a coal-powered power plant, if the turbines are upgraded and result in improved efficiency, we can calculate the increase in energy production and the decrease in heat transfer to the environment.
Using the given example, with a prior efficiency of 36% and an improvement of 3.32%, the new efficiency would be 39.32%. The additional electrical energy produced due to the upgrade can be calculated as:
Calculate the original electrical energy produced: 36% of 2.50×10¹⁴ J.
Calculate the new electrical energy produced: 39.32% of 2.50×10¹⁴ J.
The difference between the two is the additional energy produced due to the upgrade.
Similarly, the heat transfer to the environment after the upgrade will be less by the amount of increased electrical energy production, since the total heat input remains the same.