Page 4 - Combined_140_OCR

Ti '!<’■ -RATION SYSTEM - The refrigeration system of
face condenser (water consumption loon m /b (3<TpO0
the climarj: wind tunnel (manufactured by Brissonncati-York.
U.S. gal/hr)) and is condensed at abo;r " ? C i i- . .
.Hanies) has a capacity of .’,000,000 kcal/h (7,936,650 Bru/
rcliigerant which is now Jiqi.iLd is icool I io <i i
hr) and is one <4 the largest units of its kind in Europe. <
of -42 C (-43.6 !■') through an luier-oolcr and id fed eg.* ini
31 ■ gram of the. system is shown in Fig. 2.
into an evaporator, that is, a heat cxcLing r. In :ii.-per-;
The pressure of the refrigerant, c 22 (dilhtoriacmon-
ator the heat absorbed in the air cottier of the -.vied tunnel
oohloroniethane) is increased from 0.9 .8 psi a) to
is extracted from the cooling arc:’.!. (tri/ hior.s’’ . . \
approximately 14 ata (199 psia) in a tour-stage radial com­
igcn 22 is a i
pressor (power consumption of 2300 kw (3080 hp)\ during
begins again.
wltich the temperature rises from -42 C (-43.GF) to +120 C
■ 3
!•'). The vaporized refrigerant then flows through a sur­ The cooling agent (circulated quantity: 71 in (12.750
Table 2 - General Specification, VW Climatic Wind Tunnel

Standard wind tunnel with free stream working section equipped with, movable
test section cover.
Goltingcr design with horizontal return duet made of sheet metal
(thermally insulated).

Airflow
Maximum airspeed V
max
Air flow rate at V
max
Lowest air temperature a: V -30 C
max
Lowest air temperature under partial load conditions below
Highest air temperature at V -HjO C
° 1 max
n
Single-stage axial compressor with 10 blades
Airspeed control by oil-hydraulic adjustment of blades
Rotor diameter 9m (29-1/2 ft)
Driven by pole changeable three phase asynchronous
motor:
Fan speed 175-116 rpm
Rated power j 2600/740 kW (3480/990 hp)
Rated speed 1489/99.1 rpm
Aerodynamic Balance
Self-compensating mechanical six-component sliding
weight balance with automatic extension of measur­
es
ing range
Following factors are measured: Air drag, side force
(separately for front and rear axle), lift (separately
for all 4 wheels), yawing moment, rolling moment,
pitching moment
Measuring range of the balance elements:
Drag and lift 0-600 kp (0-1320 lb)
Side force 0-300 kp (0-660 lb)
Accuracy to within 10 p (0.35 oz)
Simulation of side wind by infinitely varia’/ \ angular
adjustment of balance with test vehicle.
Program-Controlled Dynamometer Test Bench
Braking output 120 ps (118 hp)
Roller diameter 1.8 m (6 ft)
Simulation of: Vehicle weight, rolling resistance, gradient resistance, air drag,, and ac-'
c e 1 e r a t i o n r e s is t a n c e