The door of a running refrigerator inside a room is left open.  The correct statement out of the following one is

  1. The room will be cooled slightly
  2. The room will be warmed up gradually
  3. The temperature of the room will remain undefected
  4. None of these

Answer (Detailed Solution Below)

Option 2 : The room will be warmed up gradually
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Detailed Solution

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Concept:

Domestic refrigerator

  • A domestic refrigerator is essentially small cold storage where several food products such as ice cream, meat, fruits, milk, etc can be stored at reduced pressure.
  • A domestic refrigerator uses a vapor compression refrigeration system for maintaining the required storage conditions.
  • As the room is closed, so no heat will go outside. Now, the refrigerator working is as shown.

  • Q1 = Q2 + W
  • So, Q1 > Q2;
  • Now, in our case when the door is open, then the Q2 is the heat will be absorbed from the entire room instead of just the refrigerator compartment and then the heat Q1 is the heat rejected to the room.
  • Now we have already derived that: Q1 > Q2
  • That is, the heat rejected is more than heat absorbed in the room. 

  • Hence there is a net heat addition in the room and the temperature of the room would increase.

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