What will be the change in room temperature if door of refrigerator kept open? This question is often asked at mechanical engineering job interview and also in engineering examination.
Ans: NO, Rather, temperature of the room will increase over the time, not instantly.
To understand this, let us first understand the working of domestic refrigerator. It contains four different equipment namely compressor, condenser, capillary tube and evaporator and it also has refrigerant or working fluid/medium which continuously circulating through all these four different equipment to enable heat transfer and thus cooling. The refrigerant while passing through different parts, changes phase and this enable cooling in domestic refrigerator.