|
Before
answering this question, let’s remind ourselves that in the last
chapter we saw that there is a refrigerant called R22 that vaporises
at
-42°C at atmospheric pressure by absorbing heat. R22 is therefore
capable of absorbing heat from any material whose temperature is
greater than -42°C.
This
is wonderful, as it just so happens that we want to chill foods
in our fridge whose temperature is higher than this.
As
we saw in the last chapter, if the pressure in the cylinder is greater
than atmospheric, when we open the valve the R22 emerges in the liquid
state after passing through the dip tube… |
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Previous exercise.gif){kind=small}