Exercises

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The air-cooled condenser

We’ve just seen the essentials of how an air-cooled condenser operates, and you should be able to understand everything that’s been discussed before we continue. To help you with this, we’re now going to do a little exercise that will enable you to decide for yourself exactly how well you’ve understood the subject…

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

puce

External temperature (point 1) : 25°C

puce

DTtotal at the condenser : 15°C   

puce

DT of the air : 7°C 

puce

Sub- cooling : 5°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 up to you to complete the entries in the first table : 

Point 1 (°C)

Point 2 (°C)

DT total (°C)

Point 3 : HP (°C)

Point 3 : HP (bar)

 25°C

 

 15°C

 

 Now complete the second table:

 Points

A

B

C

D

E

 T in °C

 70°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 119 to 139)

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