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. Fitting the removable ball coupling
Fig. 106 Overview: removable ball coupling Fig. 107 In the rear bumper: removing the cover of the towing bracket. First read and observe the introductory information and safety warnings The removable ball coupling is located in the vehicle tool kit in the luggage compartment either ...

Volkswagen Touran Owners Manual. General information
Fig. 149 In the tailgate: location of the Rear Assist rear-view camera Fig. 150 Rear Assist system display First read and observe the introductory information and safety warnings Function For vehicles without optical parking system (OPS) or vehicles w ...