# US 2019/0376750 A1 · Water heat exchanger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376750 A1 - Document ID: US20190376750A1 - Status: Published application - Kind: A1 - Application number: 16/477,564 - Filed: 2018-01-10 - Published: 2019-12-12 - Earliest claimed: 2017-01-13 - Assignees: Daikin Industries, Ltd. - Applicants: Daikin Industries, Ltd. - Inventors: Yutaka Shibata - Web page: https://patentgrep.com/patent/US20190376750A1 ## CPC - F28F 3/04: the means being integral with the element - F28F 3/08: Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning - F28D 7/16: the conduits being arranged in parallel spaced relation ({F28D7/0008 - F28D7/0058 take precedence}; F28D7/02 - F28D7/10 take precedence) - F28D 9/00: Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall {(F28F3/083, F28F3/086 take precedence)} - F28D 9/0037: {the conduits for the other heat-exchange medium also being formed by paired plates touching each other (F28D9/0043 takes precedence)} - F28F 3/048: {in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels} - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) ## 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 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. ### Claim 4 (depends on 3) 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. ### Claim 5 (depends on 3) 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. ### Claim 6 (depends on 1) 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.