Ventilation Unit For Refrigeration Plants

Abstract

A ventilation unit (1) designed for installation and use at a refrigeration plant has a fan and a heat exchanger (3) arranged in series with the fan. The fan is designed and positioned with regard to the heat exchanger (3) so as it delivers, in operation, an air volume flow through the heat exchanger (3) and out from the ventilation unit. The fan is designed as a diagonal fan (2). The diagonal fan axially draws in the air volume flow during operation and blows it out diagonally at an angle relative to its axis of rotation (RA).

1 - 13 . (canceled) 
     
     
         14 . A ventilation unit designed for installation and use at a refrigeration plant comprising:
 a fan and a heat exchanger arranged in series with the fan, the fan is designed and positioned with regard to the heat exchanger so as to deliver, in operation, an air volume flow through the heat exchanger and out from the ventilation unit;   the fan is designed as a diagonal fan, the diagonal fan axially draws in the air volume flow during operation and blows it out diagonally at an angle relative to its axis of rotation (RA); and   the heat exchanger is designed to cool the air volume flow down to a mean delivery temperature of ≤15° C. in order to form a cold air volume, and the cold air volume flow can be directly drawn in and blown out by the diagonal fan.   
     
     
         15 . The ventilation unit as claimed in  claim 14 , wherein the diagonal fan is designed to draw in the air volume flow axially and to blow it out diagonally at an angle of 10°-80°, especially an angle of 25-60° with respect to its axis of rotation (RA). 
     
     
         16 . The ventilation unit as claimed in  claim 14 , wherein the diagonal fan is designed and arranged in the ventilation unit to draw in the air volume flow axial through the heat exchanger and to blow it out from the ventilation unit into the free surroundings. 
     
     
         17 . The ventilation unit as claimed in  claim 14 , wherein the heat exchanger for the diagonal fan generates, by progressive frosting during operation, a flow resistance increasing from a starting flow resistance with a first resistance characteristic (A) to a frosting resistance with a second resistance characteristic (B) and the diagonal fan is designed to have its highest efficiency range in an area of a third resistance characteristic (C) of the heat exchanger, wherein the third resistance characteristic (C) lies between the first and the second resistance characteristic (A, B), and the resistance characteristics (A, B, C) are characterized by an increasing backpressure psf [Pa] plotted against a delivered air quantity qv [m3/h]. 
     
     
         18 . The ventilation unit as claimed in  claim 14 , wherein the diagonal fan and the heat exchanger are joined together by a housing, the housing forms a closed flow duct for the air volume flow. 
     
     
         19 . The ventilation unit as claimed in  claim 14 , wherein the ventilation unit is designed as an integrated structural unit for complete arrangement and fastening on the refrigeration plant. 
     
     
         20 . The ventilation unit as claimed in  claim 14 , wherein the heat exchanger is designed as an evaporator. 
     
     
         21 . The ventilation unit as claimed in  claim 14 , further comprising a guide device, the guide device is arranged in a blowout portion of the diagonal fan and designed to deflect the air volume flow blown out by the diagonal fan in a diagonal direction into an axial direction. 
     
     
         22 . The ventilation unit as claimed in  claim 21 , wherein the guide device is designed as a single piece on the diagonal fan. 
     
     
         23 . The ventilation unit as claimed in  claim 20 , wherein the guide device is designed to transform a spin of the air volume flow produced by the diagonal fan partly into static pressure. 
     
     
         24 . The ventilation unit as claimed in  claim 14 , wherein the diagonal fan has a co-rotating cover disk. 
     
     
         25 . The ventilation unit as claimed in  claim 18 , wherein the housing forms an air guidance for the air volume flow produced by the diagonal fan.