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Jet aircrafts fly at altitudes above 30,...

Jet aircrafts fly at altitudes above 30,000 ft where the air is very cold at `- 40^(@)C` and the pressure is 0.28 atm. The cabin is maintained at 1 atm pressure by means of a compressor which exchanges air from outside adiabatically. In order to have a comfortable cabin temperature of `25^(@)C`, we will require in addition

A

a heater to warm the air injected into the cabin

B

an air-conditioner to cool the air injected into the cabin

C

neither a heater nor an air-conditioner , the compressor is sufficient

D

alternatively heating and cooling in the two halves of the compressor cycle

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The correct Answer is:
B
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