Cooling device for switchgear cabinet or other electronic equipment housing

摘要

The cabinet is cooled by a cold prim. circuit contg. a compressor (1), condenser (2) filter/dryer (3), expansion valve (4) and evaporator (5), and a sec. circuit (22) in which water or brine is pumped (7) through a heat exchanger (8) in the flow of air extracted from the cabinet by a motor-driven fan (15).Excessive pressure and flow in the sec. circuit, which supplies hot water to the prim. evaporator, are prevented by valves (9,10). A power board (17) subject to a controller (16) supplies current to prim. and sec. fan motors (M2,M3), the compressor motor (M1), air thermometers (B1-B3) and a prim. circuit pressure monitor (20).