What volition hold upwards the alter inwards room temperature if door of fridge kept open? This query is oft asked at mechanical applied scientific discipline chore interview as well as likewise inwards applied scientific discipline examination.
Ans: NO, Rather, temperature of the room volition increase over the time, non instantly.
Why?
Why?
To sympathise this, allow us commencement sympathise the working of domestic refrigerator. It contains 4 dissimilar equipment namely compressor, condenser, capillary underground as well as evaporator as well as it likewise has refrigerant or working fluid/medium which continuously circulating through all these 4 dissimilar equipment to enable oestrus transfer as well as hence cooling. The refrigerant piece passing through dissimilar parts, changes stage as well as this enable cooling inwards domestic refrigerator.
Construction as well as Working of domestic refrigerator
Evaporator is a oestrus exchanger which removes the oestrus from stuffs or foods to hold upwards cooled past times evaporating (Evaporation condition: BP < Evaporation temperature) the depression pressure level liquid refrigerant piece passing through it. At depression pressure, Boiling Point (BP) of refrigerant is low, good below room temperature, hence when exposed to room temperature, liquid refrigerant starts evaporating past times taking oestrus from foods, hence foods larn cooled). Once the consummate evaporation of refrigerant takes place,It has at nowadays no to a greater extent than capacity to absorb the oestrus from foods. And over again it needs depression pressure level liquid shape to gets evaporated.
Refrigerant tin solely gets condensed (liquid form) inwards condenser (at room temperature condition). But at room temperature condition, refrigerant is good higher upwards its BP, as well as so it cannot hold upwards converted to lower stage i.e. liquid stage as well as volition stay inwards vapour shape (Room temperature > BP of refrigerant).
Hence, it needs higher BP than room temperature as well as so that condensation tin accept house at room temperature. BP is a purpose of pressure, higher the pressure level of refrigerant, higher the BP as well as vice versa. Thus, Compressor is used to heighten the pressure level of depression pressure level vapour refrigerant. At the outlet of compressor, vapour refrigerant is inwards high pressure level as well as heat condition. Due to high pressure, BP of refrigerant is at nowadays good higher upwards the room temperature as well as it tin at nowadays easily condensed inwards condenser past times rejecting oestrus to room temperature air (Condensation condition: BP > Condensation temperature). The amount of oestrus is at nowadays addition of oestrus taken at evaporator plus oestrus of compression at compressor.
Thus, at outlet of condenser, refrigerant is at high pressure level as well as is inwards liquid form. But again, to larn lower boiling request good below the room temperature, this high pressure level should hold upwards over again reduced to depression pressure level status of evaporator. To trim the pressure, high pressure level liquid refrigerant is at nowadays passed through the capillary underground which has high length as well as lower within diameter. Thus piece passing throught the capillary tube, due to friction, pressure level is reduced as well as partial cooling takes house equally boiling request reduction starts (along amongst evaporation).
Now, depression pressure level liquid refrigerant (having BP is good below the room temperature) enters the evaporator as well as start evaporating at room temperature past times taking oestrus of foods to trim its temperature. And CYCLE continues.
Let us analyse the situation.
Q1 = Heat absorb at evaporator
Q2 = Heat rejected at condenser
W = Work of compressor
The relation is now, Q2 = Q1+W
Thus, Q2 > Q1
In unopen door situation, Q2 > Q1 (as Q1 volition hold upwards absored from evaporator compartment only)
Thus, inwards unopen door situation, in that location is no alter inwards the room temperature equally usual.
In OPEN door situation, Q1 volition hold upwards add-on of oestrus taken from foods as well as entire room, which eventually increase the Q2. So, in that location volition hold upwards increase inwards temperature of room if door is kept open.