Question:
For an air cooler to work at maximum efficiency:
For an air cooler to work at maximum efficiency:
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Evaporative cooling efficiency is highly dependent on the relative humidity of the intake air. Low humidity (dry air) equals high evaporation rates and better cooling.
Updated On: Apr 19, 2026
- Placed away from window & water has salt
- Placed away from window & no salt in water
- Placed towards window & water has salt
- Placed towards window & no salt in water
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question explores the practical and thermodynamic factors that affect the cooling efficiency of an evaporative air cooler.
Step 2: Detailed Explanation:
Air coolers work on the principle of evaporative cooling. For maximum efficiency, two main factors are crucial:
1. Fresh Air Supply: An air cooler should be placed near a window or an open area. This ensures it draws in dry, fresh air. If placed in a closed room, the humidity in the room rises, which eventually stops the evaporation process and reduces cooling.
2. Water Purity: Salt dissolved in water increases the boiling point and decreases the vapor pressure of the water. This inhibits the rate of evaporation. Pure water (no salt) evaporates faster and provides better cooling.
Step 3: Final Answer:
Maximum efficiency is achieved when the cooler is placed towards a window for fresh dry air and uses water with no salt for higher evaporation.
The question explores the practical and thermodynamic factors that affect the cooling efficiency of an evaporative air cooler.
Step 2: Detailed Explanation:
Air coolers work on the principle of evaporative cooling. For maximum efficiency, two main factors are crucial:
1. Fresh Air Supply: An air cooler should be placed near a window or an open area. This ensures it draws in dry, fresh air. If placed in a closed room, the humidity in the room rises, which eventually stops the evaporation process and reduces cooling.
2. Water Purity: Salt dissolved in water increases the boiling point and decreases the vapor pressure of the water. This inhibits the rate of evaporation. Pure water (no salt) evaporates faster and provides better cooling.
Step 3: Final Answer:
Maximum efficiency is achieved when the cooler is placed towards a window for fresh dry air and uses water with no salt for higher evaporation.
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