Laminated heat exchanger

Abstract

To reduce a freezing risk of high temperature side fluid and suppress deterioration in durability in a laminated heat exchanger.SOLUTION: A laminated heat exchanger 10 includes a laminated body 15 having a fluid layer 11 including a high temperature flow passage 12a to which first fluid is introduced and a low temperature flow passage 13a to which second fluid is introduced, and an intermediate medium layer 21 including a middle temperature flow passage 21a to which an intermediate medium is introduced. The middle temperature flow passage 21a includes a heating part 21b for causing heat exchange between the intermediate medium and the first fluid flowing through the high temperature flow passage 12a, and a cooling part 21c for causing heat exchange between the intermediate medium after flowing through the heating part 21b and the second fluid flowing through the low temperature flow passage 13a. A return flow passage returns the intermediate medium flowing out from the middle temperature flow passage 21a to the middle temperature flow passage 21a.SELECTED DRAWING: Figure 1

Claims

1. A fluid layer having a high-temperature channel into which a first fluid is introduced and a low-temperature channel into which a second fluid at a lower temperature than the first fluid is introduced, An intermediate medium layer is laminated in the fluid layer and has a medium-temperature channel into which an intermediate medium that is colder than the first fluid and hotter than the second fluid is introduced, A laminate comprising, The intermediate medium layer includes a heating section that generates heat exchange between the intermediate medium flowing through the intermediate medium and the first fluid flowing through the high-temperature section, and a cooling section that generates heat exchange between the intermediate medium before or after flowing through the heating section and the second fluid flowing through the low-temperature section. A stacked heat exchanger further comprising a return channel that returns the intermediate medium that has flowed out of the medium-temperature channel back to the medium-temperature channel.

2. The laminated heat exchanger according to claim 1, wherein the heating section and the cooling section are arranged in positions that do not overlap with each other in the lamination direction of the fluid layer and the intermediate medium layer in the laminate.

3. The laminated heat exchanger according to claim 2, wherein the fluid layer separately comprises a high-temperature layer having the high-temperature flow path but not the low-temperature flow path, and a low-temperature layer having the low-temperature flow path but not the high-temperature flow path.

4. The high-temperature channel and the low-temperature channel are located within the same layer. The laminated heat exchanger according to claim 2, wherein a heat transfer suppression section is provided between the high-temperature section provided with the high-temperature channel and the low-temperature section provided with the low-temperature channel to suppress heat exchange between the first fluid and the second fluid.

5. The laminated heat exchanger according to claim 1 or 2, wherein the return channel is provided with a pump that causes the intermediate medium to flow from the heating section to the cooling section in the medium-temperature channel, and then flow out of the cooling section to the return channel, and a cold energy utilization section that receives the cold energy of the intermediate medium.

6. The laminated heat exchanger according to claim 1 or 2, wherein the return channel is provided with a pump that causes the intermediate medium to flow in the intermediate temperature channel so that after the intermediate medium flows from the cooling section to the heating section, it flows out from the heating section to the return channel.

7. A second fluid layer having a second high-temperature channel into which a first fluid is introduced and a second low-temperature channel into which a second fluid at a lower temperature than the first fluid is introduced, A second intermediate medium layer is laminated on the second fluid layer and has a second intermediate temperature channel into which an intermediate medium having a temperature between the first fluid and the second fluid is introduced, A second laminate comprising the following: The second intermediate medium channel of the second intermediate medium layer includes a second heating section that generates heat exchange between the intermediate medium and a first fluid flowing through the second high-temperature channel, and a second cooling section that generates heat exchange between the intermediate medium after it has flowed through the second heating section and a second fluid flowing through the second low-temperature channel. The system further includes a second return channel for returning the intermediate medium that has flowed out from the second cooling section of the second medium-temperature channel to the second heating section of the second medium-temperature channel. The stacked heat exchanger according to claim 6, wherein the second return channel is provided with a cold energy utilization section that receives cold energy from the intermediate medium.

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