Water heat exchanger

Abstract

A water heat exchanger includes: a first layer and a second layer that are stacked upon each other and that exchange heat between a first fluid and a second fluid. The first fluid is water. The second fluid is a refrigerant. The first layer includes first flow paths disposed in a plurality of rows and through which the first fluid flows. The second layer includes second flow paths disposed in a plurality of rows and through which the second fluid flows. When the first layer is viewed in a stacking direction of the first layer and the second layer, each of the first flow paths extends from one end portion to another end portion of the first layer in a direction crossing an arrangement direction of the first flow paths.

1 . A water heat exchanger comprising:
 a first layer and a second layer that are stacked upon each other and that exchange heat between a first fluid and a second fluid, wherein the first fluid is water,   the second fluid is a refrigerant,   the first layer comprises first flow paths disposed in a plurality of rows and through which the first fluid flows,   the second layer comprises second flow paths disposed in a plurality of rows and through which the second fluid flows,   when the first layer is viewed in a stacking direction of the first layer and the second layer, each of the first flow paths extends from one end portion to another end portion of the first layer in a direction crossing an arrangement direction of the first flow paths,   when the second layer is viewed in the stacking direction, each of the second flow paths extends from one end portion to another end portion of the second layer in a direction crossing an arrangement direction of the second flow paths, and   the first flow paths are disposed such that, when the first fluid is heated by the second fluid, a flow-path cross-sectional area of a first-fluid outlet vicinity is larger than a first flow-path cross-sectional area of a first upstream-side portion disposed upstream of the first-fluid outlet vicinity.   
     
     
         2 . The water heat exchanger according to  claim 1 , wherein
 the first flow paths are merged such that a number of the first flow paths at the first-fluid outlet vicinity is less than a number of the first flow paths at the first upstream-side portion.   
     
     
         3 . A water heat exchanger comprising:
 a first layer and a second layer that are stacked upon each other and that exchange heat between a first fluid and a second fluid, wherein   the first fluid is water,   the second fluid is a refrigerant,   the first layer comprises first flow paths disposed in a plurality of rows and through which the first fluid flows,   the second layer comprises second flow paths disposed in a plurality of rows and through which the second fluid flows,   when the first layer is viewed in a stacking direction of the first layer and the second layer, each of the first flow paths extends from one end portion to another end portion of the first layer in a direction crossing an arrangement direction of the first flow paths,   when the second layer is viewed in the stacking direction, each of the second flow paths extends from one end portion to another end portion of the second layer in a direction crossing an arrangement direction of the second flow paths, and   the second flow paths are disposed such that, when the first fluid is cooled by the second fluid, a flow-path cross-sectional area of a second-fluid outlet vicinity is larger than a flow-path cross-sectional area of an upstream-side portion disposed upstream of the second-fluid outlet vicinity.   
     
     
         4 . The water heat exchanger according to  claim 3 , wherein
 the second flow paths are merged such that a number of the second flow paths at the second-fluid outlet vicinity is less than a number of the second flow paths at the upstream-side portion.   
     
     
         5 . The water heat exchanger according to  claim 3 , wherein
 the second flow paths are branched such that a number of the second flow paths at the second-fluid outlet vicinity is larger than a number of the second flow paths at the upstream-side portion.   
     
     
         6 . The water heat exchanger according to  claim 1 , wherein the second flow paths are disposed such that, when the first fluid is cooled by the second fluid, a flow-path cross-sectional area of a second-fluid outlet vicinity disposed in a vicinity of an outlet for the second fluid is larger than a second flow-path cross-sectional area of a second upstream-side portion disposed upstream of the second-fluid outlet vicinity.