# US 2021/0239403 A1 · Stacked heat exchanger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0239403 A1 - Document ID: US20210239403A1 - Status: Published application - Kind: A1 - Application number: 17/054,304 - Filed: 2019-05-21 - Published: 2021-08-05 - Earliest claimed: 2018-06-06 - Assignees: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) - Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) - Inventors: Koji NOISHIKI - Web page: https://patentgrep.com/patent/US20210239403A1 ## CPC - 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 3/04: the means being integral with the element - 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 3/08: Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning - F28F 13/08: by varying the cross-section of the flow channels - F28F 13/14: by endowing the walls of conduits with zones of different degrees of conduction of heat - F28F 2210/08: Assemblies of conduits having different features - F28F 2215/04: Assemblies of fins having different features, e.g. with different fin densities - F28F 2260/02: having microchannels - F28F 2265/00: Safety or protection arrangements; Arrangements for preventing malfunction - F28F 2275/061: by diffusion bonding - 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) - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) ## Abstract This stacked heat exchanger is provided with: a high temperature layer that comprises a plurality of channels into which a high temperature-side fluid is introduced; and a low temperature layer that is superposed on the high temperature layer and comprises a plurality of channels into which a low temperature-side fluid is introduced, said low temperature-side fluid being at a temperature that is lower than the temperature of the high temperature-side fluid. Each one of the plurality of channels of the low temperature layer has: an upstream-side part in which at least some of the low temperature-side fluid evaporates by being heated by the high temperature-side fluid that flows within the high temperature layer; and a downstream-side part in which the low temperature-side fluid that has evaporated in the upstream-side part is heated by the high temperature-side fluid that flows within the high temperature layer. The ratio of the areas of the plurality of upstream-side parts in a predetermined area of the low temperature layer is lower than the ratio of the areas of the plurality of downstream-side parts in the predetermined area of the low temperature layer. ## Claims ### Claim 1 A stacked heat exchanger, comprising: a high temperature layer that has a plurality of channels into which a high temperature-side fluid is introduced; and a low temperature layer that has a plurality of channels into which a low temperature-side fluid is introduced, the low temperature layer being stacked on the high temperature layer, and the low temperature-side fluid having a temperature lower than the high temperature-side fluid, wherein each of the channels of the low temperature layer has an upstream-side part in which at least a part of the low temperature-side fluid evaporates by being heated by the high temperature-side fluid that flows within the high temperature layer, and a downstream-side part in which the low temperature-side fluid that has evaporated in the upstream-side part is heated by the high temperature-side fluid that flows within the high temperature layer, and a ratio of an area of the plurality of upstream-side parts to a predetermined area in the low temperature layer is lower than a ratio of an area of the plurality of downstream-side parts to the predetermined area in the low temperature layer. ### Claim 2 (depends on 1) The stacked heat exchanger according to claim 1, wherein due to a difference in at least one of channel shape, channel pitch, channel width, and channel depth, the ratio of the area of the plurality of upstream-side parts to the predetermined area in the low temperature layer is lower than the ratio of the area of the plurality of downstream-side parts to the predetermined area in the low temperature layer. ### Claim 3 (depends on 1) The stacked heat exchanger according to claim 1, further comprising a second high temperature layer that has a plurality of channels into which the high temperature-side fluid is introduced, the second high temperature layer being stacked on an opposite side of the high temperature layer from the low temperature layer. ### Claim 4 (depends on 1) The stacked heat exchanger according to claim 1, wherein the low temperature layer further includes a communication channel that is communicated with the upstream-side part of each of the channels and is communicated with the downstream-side part of each of the channels. ### Claim 5 (depends on 1) The stacked heat exchanger according to claim 1, wherein each of the upstream-side parts has the same length. ### Claim 6 (depends on 1) The stacked heat exchanger according to claim 1, wherein each of the upstream-side parts has a shape extending linearly, and each of the downstream-side parts has a shape extending in a wave shape or a zigzag shape. ### Claim 7 (depends on 1) The stacked heat exchanger according to claim 1, wherein each of the upstream-side parts has a shape extending linearly, and each of the downstream-side parts is different from the upstream-side part in at least one of channel pitch, channel width and channel depth, and has a shape extending linearly. ### Claim 8 (depends on 2) The stacked heat exchanger according to claim 2, wherein the low temperature layer further includes a communication channel that is communicated with the upstream-side part of each of the channels and is communicated with the downstream-side part of each of the channels. ### Claim 9 (depends on 3) The stacked heat exchanger according to claim 3, wherein the low temperature layer further includes a communication channel that is communicated with the upstream-side part of each of the channels and is communicated with the downstream-side part of each of the channels.