Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoThermal ExpansionMedium2 minQB
PhysicsMediumstatement
Water coolers used to cool room by blowing air in room through a water soaked dry grass filter. How does this work. Would it work well in a high humidity climate?
Evaluate the following statements.
Statement I: Water evaporates from the wet filter and removes latent heat; high humidity reduces the cooling.
Statement II: The filter removes humidity and works best in saturated air.
Options:
Answer:
B
Solution:
Air passes over the wet grass; water evaporates, taking latent heat from the air and the grass, so the air leaving is cooler and more humid. In high humidity the air is already close to saturation, evaporation is slow, and the cooler works poorly. It works best in hot, dry climates. Statement I is true and Statement II false. Correct option: (B).
Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermal Expansion
⏱ 2mℹ️ Source: QB
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