By how much air in the room changes temperature, Mechanical Engineering

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By how much air in the room changes temperature

A steam radiator in a well-insulated room (4m × 4m × 5m) contains superheated vapor at (200kPa, 200C). It has a volume of 15L. All valves to the radiator are currently closed. Pressure in the radiator drops to 100kPa in 30 minutes. By how much does the air in the room change temperature? Assume the room volume remains constant.

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