Switch cabinet

Abstract

The invention relates to a switch cabinet with a closed cooling air circuit and a heat exchanger for dissipating the heat loss from electronic modular units located in an inner area. For efficient cooling and to avoid the removal to the switch cabinet environment of condensate produced in the heat exchanger, at least one atomizing device is provided and transforms the condensate into aerosols. The condensate aerosols are immediately resupplied to the cooling air circuit, preferably the hot, dry exhaust air flow, so that simultaneously an advantageous atmospheric humidity stabilization in the switch cabinet is ensured.

1 . Switch cabinet
 having an inner area for receiving electronic modular units, a closed cooling air circuit, which has a heat exchanger for dissipating the heat loss of the electronic modular units, and   with a collecting device for the condensate produced in the heat exchanger,   
     wherein
 an atomizing device for the condensate is provided which transforms the condensate into aerosols, 
 the condensate aerosols can be supplied to the cooling air circuit for stabilizing the atmospheric humidity in the switch cabinet and the atomizing device, relative to the flow direction of the cooling air circuit, is positioned upstream of the heat exchanger and the condensate aerosols can be received by hot, dry exhaust air flow subject to the heat loss of the electronic modular units and can be transformed into water vapour accompanied by an adiabatic cooling of the exhaust air flow. 
 
   
   
       2 . Switch cabinet according to  claim 1 , 
     wherein
 at least one ultrasonic vibrator is provided as the atomizing device. 
 
   
   
       3 . Switch cabinet according to  claim 1 , 
     wherein
 at least one high pressure nozzle is provided as the atomizing device. 
 
   
   
       4 . Switch cabinet according to  claim 1 , 
     wherein
 the collecting device for the condensate is a condensate collecting tank placed below the heat exchanger and a pump and a condensate line are provided, which supply a predeterminable condensate quantity to the atomizing device. 
 
   
   
       5 . Switch cabinet according to  claim 1 , 
     wherein
 a vibrating tank is provided for an ultrasonic vibrator as the atomizing device and into which the condensate can be introduced from the collecting device. 
 
   
   
       6 . Switch cabinet according to  claim 5 , 
     wherein
 the condensate can be supplied to the vibrating tank with the aid of a bevel, e.g. a bevelled bottom of the collecting device. 
 
   
   
       7 . Switch cabinet according to  claim 1 , 
     wherein
 a piezoceramic ultrasonic vibrator with a frequency >20,000 Hz or a magnetostrictive ultrasonic vibrator with a frequency up to 200 Hz is used as the atomizing device. 
 
   
   
       8 . Switch cabinet according to  claim 1 , 
     wherein
 a high pressure pump is provided, which supplies condensate at a pressure >50 bar to a high pressure nozzle as the atomizing device. 
 
   
   
       9 . Switch cabinet according to  claim 1 , 
     wherein
 the atomizing device can be regulated as a function of the atmospheric humidity in the supply air flow. 
 
   
   
       10 . Switch cabinet according to  claim 1 , 
     wherein
 an overflow device is provided in the collecting device. 
 
   
   
       11 . Switch cabinet according to  claim 1 , 
     wherein
 the heat exchanger is provided as an air-water heat exchanger in the bottom area of the switch cabinet. 
 
   
   
       12 . Cooling device for a switch cabinet with a closed cooling air circuit having a collecting device for the condensate produced, wherein
 an atomizing device is provided for the condensate which transforms the latter into aerosols,   the condensate aerosols formed can be resupplied to the cooling air circuit for stabilizing the atmospheric humidity in the switch cabinet, and   the atomizing device is positioned upstream of the cooling device, relative to the flow direction of the cooling air circuit, and   the condensate aerosols can be received by a hot, dry exhaust air flow subject to the heat loss of electronic modular units and can be transformed into water vapour accompanied by an adiabatic cooling of the exhaust air flow.