Evaporator and Refrigeration System Comprising Same

Abstract

The present application provides an evaporator, comprising: a housing; and a falling film tube bundle disposed in an accommodating cavity and arranged in columns, the falling film tube bundle comprising a plurality of heat exchange tubes, the centers of the heat exchange tubes in each column being arranged along a height direction, and the centers of two adjacent heat exchange tubes in adjacent columns being staggered in a width direction of the accommodating cavity; wherein the falling film tube bundle is configured in a way that among four adjacent heat exchange tubes in two adjacent columns, a minimum distance between outer surfaces of at least two heat exchange tubes in different columns is greater than a minimum distance between outer surfaces of two heat exchange tubes in the same column. In the present application, a flow rate of gas flowing among the corresponding heat exchange tubes is reduced by increasing the flow space of a refrigerant in the width direction W, so that a ratio of the gas phase Reynolds number Re v to the liquid film Reynolds number Re film is reduced, and thus the heat exchange efficiency of the evaporator is improved.

1 . An evaporator, comprising:
 a housing, wherein the housing has an accommodating cavity, the accommodating cavity has a length direction (L), a width direction (W), and a height direction (H); and   a falling film tube bundle, wherein the falling film tube bundle is disposed in the accommodating cavity and arranged in columns, the falling film tube bundle comprises a plurality of heat exchange tubes, each heat exchange tube of the plurality of heat exchange tubes extends along the length direction (L) of the accommodating cavity, respective centers of the heat exchange tubes in each column are arranged along the height direction (H), and respective centers of two adjacent heat exchange tubes in adjacent columns are staggered in the width direction (W) of the accommodating cavity,   wherein the falling film tube bundle is configured such that among four adjacent heat exchange tubes in two adjacent columns, a minimum distance (V 0 , V 1 , V 2 ) between outer surfaces of at least two heat exchange tubes in different columns is greater than a minimum distance (X 0 , X 1 , X 2 ) between outer surfaces of two heat exchange tubes in the same column.   
     
     
         2 . The evaporator of  claim 1 , wherein:
 among the four adjacent heat exchange tubes in two adjacent columns, a distance between outer surfaces of at least two heat exchange tubes in different columns is set to reduce a flow rate of gas flowing through the two adjacent columns of heat exchange tubes, thereby and improve heat exchange efficiency of the evaporator.   
     
     
         3 . The evaporator of  claim 2 , wherein:
 each heat exchange tube of the plurality of heat exchange tubes in the falling film tube bundle has a common tube diameter (D 0 ), and a ratio of a distance (W 0 ) of the centers, in the width direction (W) of the accommodating cavity, of two adjacent heat exchange tubes in adjacent columns to a distance (H 0 ) of the centers, in the height direction (H) of the accommodating cavity, of two adjacent heat exchange tubes in the heat exchange tubes in each column satisfied a relationship:   
       
         
           
             
               
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         4 . The evaporator of  claim 2 , wherein:
 the falling film tube bundle comprises a plurality of first heat exchange tubes with a first tube diameter (D1) and a plurality of second heat exchange tubes with a second tube diameter (D2), and   the plurality of first heat exchange tubes and the plurality of second heat exchange tubes are staggered in the columns of the falling film tube bundle.   
     
     
         5 . The evaporator of  claim 2 , wherein:
 the falling film tube bundle comprises a plurality of first heat exchange tubes with a first tube diameter (D1) and a plurality of second heat exchange tubes with a second tube diameter (D2), wherein the plurality of first heat exchange tubes is arranged in first columns, and the plurality of second heat exchange tubes is arranged in second columns, and   wherein the first columns of the plurality of first heat exchange tubes and the second columns of the plurality of second heat exchange tubes are staggered.   
     
     
         6 . The evaporator of  claim 4 , wherein:
 a distance (W1, W2) of the centers, in the width direction (W) of the accommodating cavity, of the plurality of first heat exchange tubes and the plurality of second heat exchange tubes that are adjacent to each other in two adjacent columns of heat exchange tubes is not less than the first tube diameter (D1) of the plurality of first heat exchange tubes.   
     
     
         7 . The evaporator of  claim 6 , wherein:
 the first tube diameter (D1) of the plurality of first heat exchange tubes is 25.4 mm, and   the second tube diameter (D2) of the plurality of second heat exchange tubes is 19.05 mm.   
     
     
         8 . The evaporator of  claim 1 , wherein the evaporator further comprises:
 a first baffle plate and a second baffle plate, wherein the first baffle plate and the second baffle plate are disposed on an outer side of the falling film tube bundle in the width direction (W) of the accommodating cavity, respectively, and   wherein a plurality of windows is disposed on the first baffle plate and the second baffle plate, respectively, wherein the plurality of windows is arranged along the length direction (L) of the accommodating cavity, and the plurality of windows is disposed on the outer side at a middle portion of the falling film tube bundle in the height direction (H) of the accommodating cavity.   
     
     
         9 . The evaporator of  claim 8 , wherein:
 a respective liquid baffle plate extending along the length direction (L) of the accommodating cavity is disposed on each outer side of the plurality of windows on the first baffle plate and the second baffle plate, wherein a top of the liquid baffle plate is connected to the corresponding first baffle plate or the corresponding second baffle plate, and the liquid baffle plate and the plurality of window are spaced at a certain distance.   
     
     
         10 . A refrigeration system, comprising:
 a compressor, a condenser, a throttling device, and the evaporator of  claim 1  disposed in a refrigerant loop.