Vapour Pressure Table For Refrigerant R134A - Skoda Citigo 2012 Workshop Manual

Citigo 2012 ➤ , Fabia 2000 ➤ , Fabia II 2007 ➤ , Fabia II 2009 ➤ , Fab ...
Air conditioning system with refrigerant R134a - Edition 10.2014
1.6.3 Critical point
The critical point (critical temperature and critical pressure)
means that there is no divide over the same interface between
the surface of the liquid and the gas.
A substance is always gaseous when it is above its critical point.
At temperatures below the critical point, all types of refrigerants
in pressure tanks have a liquid and a gas phase, which means
that a gas blanket is present above the liquid.
As long as gas is still present in the tank aside from liquid, the
pressure depends upon the ambient temperature
⇒ "1.7 Vapour pressure table for refrigerant R134a", page 6
1.6.4 Environmental aspects of the refrigerant
R134a
♦ R134a is a fluorinated hydrocarbon (PFC) and contains no
chlorine.
♦ R134a has a lower atmospheric lifetime than the refrigerant
R12.
♦ R134a does not attack the ozone layer.
♦ The contribution of R134a to the greenhouse effect is by a
factor of 10 less than the effect of the refrigerant R12.
1.7 Vapour pressure table for refrigerant
R134a
The vapour pressure table is decisive for each refrigerant used in
the literature for refrigeration technicians. From this table can be
read which vapour pressure above the liquid column in the vessel
pushes when the temperature of the reservoir is known.
As for any refrigerant a characteristic vapour pressure table is
known, knowledge of the refrigerant concerned can be obtained
by pressure and temperature measurement.
Temperature in °C
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
6
Rep. gr.00 - Technical data
Pressure in bar (overpressure)
R134a
-0.61
-0.49
-0.34
-0.16
0.06
0.32
0.63
1.00
1.43
1.92
2.49
3.13
3.90
4.70
5.63
6.70
7.83
9.10
.