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Question

Which of the following is eating up most your electricity bill while running the AC during a humid monsoon day in Hawaii?


A
Sensible heat
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B
Latent heat
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C
Specific heat
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D
Both latent and sensible heat
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Solution

The correct option is B Latent heat
Humidity and temperature both have an optimum value for human comfort. During monsoon, the temperature is not very high generally but the humidity is, and to reduce humidity the water vapor has to be condensed to liquid water. This phase change requires the LATENT heat of condensation and contributes heavily to the power usage of AC.

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