An automotive air conditioner produces a 1-kW cooling effect while consuming 0.75 kW of power. What is the rate at which heat is rejected from this air conditioner

The rejected by the air conditioning system is 1.75 kilowatts.

Explanation:

A air conditioning system is a refrigeration cycle, whose receives heat from cold reservoir with the help of power input before releasing it to hot reservoir. The First Law of Thermodynamics describes the model:

Where:

- Heat rate from cold reservoir, measured in kilowatts.

- Heat rate liberated to the hot reservoir, measured in kilowatts.

- Power input, measured in kilowatts.

The heat rejected is now cleared:

If and , then:

The rejected by the air conditioning system is 1.75 kilowatts.

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