Heat exchanger

Abstract

A heat exchanger including: a channel forming section having a plurality of arrayed fluid channels; a distribution path forming section having a distribution path to which inlets of the plurality of arrayed fluid channels communicate; and a cylindrical partition wall provided in the distribution path forming section, for defining an introduction path on an inner side of the cylindrical partition wall, the distribution path being positioned on an outer side of an outer periphery of the cylindrical partition wall. The cylindrical partition wall has a plurality of distribution holes. The following expression is satisfied: L/d′×π(d/2)̂2>Σσ≧2S.

1 . A heat exchanger, comprising:
 a channel forming section having a plurality of arrayed fluid channels;   a distribution path forming section having a distribution path to which inlets of the plurality of arrayed fluid channels communicate; and   a cylindrical partition wall provided in the distribution path forming section, the cylindrical partition wall defining an introduction path on an inner side of the cylindrical partition wall, the distribution path being positioned on an outer side of an outer periphery of the cylindrical partition wall,   the cylindrical partition wall having a plurality of distribution holes each communicating the introduction path and the distribution path to each other, and   the following expression being satisfied:
     L/d ′×π( d/ 2)̂2>Σσ≧2 S  
 
   where S represents a channel sectional area of the introduction path, d represents a channel diameter of the introduction path, Σσ represents a sum of areas (σ) of the plurality of distribution holes, L represents a length of array of the plurality of distribution holes, and d′ represents a diameter of each of the plurality of distribution holes.   
     
     
         2 . A heat exchanger according to  claim 1 , wherein the diameter (d′) of the each of the plurality of distribution holes is set to 40% to 100% of a dimension (h) of each of the plurality of arrayed fluid channels in an array direction. 
     
     
         3 . A heat exchanger according to  claim 1 , wherein
 the channel forming section comprises a plurality of stacked heat transfer plates each having projections and depressions formed in a plurality of arrays,   the channel forming section defines first channels and second channels, which are alternately formed between pairs of the plurality of stacked heat transfer plates,   the channel forming section is configured to exchange heat between a first fluid flowing through each of a plurality of the first channels and a second fluid flowing through each of a plurality of the second channels, and   the plurality of arrayed fluid channels comprise the plurality of the first channels.   
     
     
         4 . A refrigeration cycle system, comprising the heat exchanger according to  claim 1 . 
     
     
         5 . A heat exchanger according to  claim 1 , wherein the each of the plurality of distribution holes is formed in a downward orientation. 
     
     
         6 . A heat exchanger according to  claim 1 , wherein the plurality of distribution holes are arrayed along an extending direction of the cylindrical partition wall.