Exercises

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The evaporator

The evaporator is a heat exchanger that operates on the same principles as the condenser. Its function is to allow the best possible exchange of heat between air of the room being air- conditioned, and the refrigerant flowing inside the equipment pipework...

We’ve just seen the basics of the normal operation of the evaporator. Now we’re going to do a little revision exercise.

EXERCISE : on the installation below, several temperature readings have been made :

puce

Ambient temperature (point 4) : 26°C  

puce

DTtotal for evaporator : 20°C  

puce

DT of the l’air : 10°C 

puce

Superheat : 6°C

Your task is to work out the missing values in order to complete the two tables (to help you, here is the gauge used).

Now it’s over to you. All you have to do is complete the table. 

Try it for yourself to assess how well you understand this subject before looking at the solutions.

Point 4 (°C)

Point 5 (°C)

DT total (°C)

Point 6 : BP (°C)

Point 6 : BP (bar)

 26°C

 

 20°C

 

 Now complete the second table :

 Points

F

G

H

I

 T in °C

 

 

 

 

 P in bar

 

 

 

 

State (see below)

 

 

 

 

State: put V if the refrigerant is as superheated Vapour, L if it is a sub-cooled Liquid and SV if it is in a Saturated Vapour state.

(Solution : Refribase Manual pages 147 to 158)

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