Volkswagen Touran Service Manual: Refrigerant R134a Vapor Pressure Table

Volkswagen Touran Service Manual / Heating, Ventilation and Air Conditioning / A/C System, General Information / Refrigerant R134a Vapor Pressure Table

The vapor pressure table for every refrigerant is published in literature for refrigeration system engineers. This table makes it possible to determine the vapor pressure acting on the column of liquid in a vessel if the temperature of the vessel is known.

Because each refrigerant has its own characteristic vapor pressure table, refrigerant can be identified by measuring the pressure and temperature.

Note

At absolute pressure, 0 bar/psi corresponds to absolute vacuum. Normal ambient pressure (positive pressure) corresponds to 1 bar (14.5 psi) absolute pressure. 0 pressure corresponds to an absolute pressure of 1 bar (14.5 psi) on most pressure gauges (indicated by -1 bar (-14.5 psi) below 0 bar/psi).

Temperature in C (F)	Pressure in bar (psi) of R134a
-45 (-49)	-0.61 (-8.84)
-40 (-40)	-0.49 (-7.10)
-35 (-31)	-0.34 (-4.93)
-30 (-22)	-0.16 (-2.32)
-25 (-13)	0.06 (0.87)
-20 (-4)	0.32 (4.64)
-15 (5)	0.63 (9.13)
-10 (14)	1.00 (14.5)
-5 (23)	1.43 (20.74)
0 (32)	1.92 (27.84)
5 (41)	2.49 (36.11)
10 (50)	3.13 (45.39)
15 (59)	3.90 (56.56)
20 (68)	4.70 (68.16)
25 (77)	5.63 (81.65)
30 (86)	6.70 (97.17)
35 (95)	7.83 (113.56)
40 (104)	9.10 (131.98)
45 (113)	10.54 (152.86)
50 (122)	12.11 (175.64)
55 (131)	13.83 (200.58)
60 (140)	15.72 (227.99)
65 (149)	17.79 (258.02)
70 (158)	20.05 (290.80)
75 (167)	22.52 (326.62)
80 (176)	25.21 (365.64)
85 (185)	28.14 (408.13)
90 (194)	31.34 (454.54)

Pressure and Boiling Point

The boiling point given in tables for a liquid is always referenced to an atmospheric pressure of 1 bar (14.5 psi). If the pressure acting on a fluid changes, its boi ...

Refrigerant R134a

Refrigerant R134a Physical Data Vehicle air conditioning systems make use of the vaporization and condensation process. In this case, one works with a substance whic ...

Other materials:

Volkswagen Touran Owners Manual. Information on the air conditioning system
First read and observe the introductory information and safety warnings The cooling system for the vehicle interior only works when the engine is running and the blower is switched on. The air conditioning system operates most effectively with the windows and the panoramic sliding roof clo ...

Volkswagen Touran Owners Manual. Cleaning and changing windscreen wiper blades
Fig. 181 Changing the windscreen wiper blades Fig. 182 Changing the wiper blade for the rear window First read and observe the introductory information and safety warnings The factory-fitted windscreen wiper blades are coated with graphite. The graphite coating ensures that windscreen ...