| Critical point (critical temperature and critical pressure) means the point above which there is no longer a surface of separation between liquid and gas. |
| Above its critical point, a substance is always gaseous. |
| At temperatures below the critical point, all types of refrigerant contained within a pressure vessel exhibit a liquid phase and a gas phase, so that there is a gas cushion above the liquid. |
| As long as there is gas in the pressure vessel alongside the liquid, the pressure depends directly on the ambient temperature → Chapter. |
Note | Different types of refrigerants must not be mixed with each other. Only refrigerants specified for the respective air conditioning system may be used. |
|
|
|
