It seems that cooling the water requires somewhere around 13x as much energy. In order to cool 250 liters of air (a reasonable estimate for the empty space in your refrigerator) by the same amount, you need to remove $Q\approx 5 kJ$. $$Q=mc\Delta\theta = 1\text)(15^\circ C)\approx 63 kJ$ of energy.
The energy we want to remove from 1 litre of milk when cooling from $22☌$ to 2☌ is ( a, b) This means to move one joule of heat energy from the milk to outside it takes 0.073 J from the mains.
$T_c$ is the temperature in the fridge (I'll say 2☌ = 275 K), and $T_h$ is room temperature (at 22☌ = 295 K), So $\gamma = 13.75$. Is the ratio of the heat extracted to the work required to extract this heat. However, you want to know the difference between opening the fridge and cooling 1l of milk. This normally means the door is open for less than 15 seconds, but in that time the fridge frequently rises to 5+☌, and you hear the cooler start up again.įor that fridge, energy consumption is close to 0 when not opened and reaches its maximum every time it is opened. I frequently retrieve items from the fridge. The fridge is very well insulated, meaning the fridge very rarely has to turn on when the door is closed. It starts to cool only when the temperature rises above 4.7☌ and stops when it sinks to 3.5☌. Where I work, the large walk-in fridge has a temperature monitor.
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