Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel Misalignment
Printed circuit heat exchangers (PCHEs), which are used for thermal heat storage and power generation, are often subject to severe pressure and temperature differences between primary and secondary channels, which causes mechanical integrity problems. PCHE operation may result in discontinuity, such...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-03-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/6/2169 |
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| author | Armanto P. Simanjuntak Jae Young Lee |
| author_facet | Armanto P. Simanjuntak Jae Young Lee |
| author_sort | Armanto P. Simanjuntak |
| collection | DOAJ |
| description | Printed circuit heat exchangers (PCHEs), which are used for thermal heat storage and power generation, are often subject to severe pressure and temperature differences between primary and secondary channels, which causes mechanical integrity problems. PCHE operation may result in discontinuity, such as channel misalignment, due to non-uniform thermal fields in the diffusion bonding process. The present paper analyzes the mechanical integrity, including the utilization factors of stress and deformation under various channel misalignment conditions. The pressure difference of the target PCHE is 19.5 MPa due to the high pressure (19.7 MPa) of the steam channel in the Rankine cycle and the low pressure (0.5 MPa) of molten salt or liquid metal in the primary channel. Additionally, the temperature difference between channels is around 25 °C, however the average temperature is around 500 °C. The PCHE has a relatively large primary channel measuring approximately 3 x 3 mm, and a steam channel measuring 2 x 1.5 mm. The finite element method (FEM) is applied to determine the stress by changing the misalignment to below 30% of the primary channel width. It was found that the current PCHE is operable up to 700 °C in terms of the ASME code under these design conditions. Additionally, the change of utilization factor due to the misalignment increases, but is still under the ASME acceptance criteria of 700 °C; however, it violates the criteria at 725 °C, which is the allowable temperature condition. Therefore, the mechanical integrity of the PCHE with low-pressure molten salt or liquid metal and a high-pressure steam channel is acceptable in terms of utilization factor. |
| first_indexed | 2024-12-13T06:23:54Z |
| format | Article |
| id | doaj.art-f2504978e5a74a01a69fe5ff919d407a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-13T06:23:54Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-f2504978e5a74a01a69fe5ff919d407a2022-12-21T23:56:46ZengMDPI AGApplied Sciences2076-34172020-03-01106216910.3390/app10062169app10062169Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel MisalignmentArmanto P. Simanjuntak0Jae Young Lee1Department of Mechanical and Control Engineering, Handong Global University, Pohang 37554, KoreaDepartment of Mechanical and Control Engineering, Handong Global University, Pohang 37554, KoreaPrinted circuit heat exchangers (PCHEs), which are used for thermal heat storage and power generation, are often subject to severe pressure and temperature differences between primary and secondary channels, which causes mechanical integrity problems. PCHE operation may result in discontinuity, such as channel misalignment, due to non-uniform thermal fields in the diffusion bonding process. The present paper analyzes the mechanical integrity, including the utilization factors of stress and deformation under various channel misalignment conditions. The pressure difference of the target PCHE is 19.5 MPa due to the high pressure (19.7 MPa) of the steam channel in the Rankine cycle and the low pressure (0.5 MPa) of molten salt or liquid metal in the primary channel. Additionally, the temperature difference between channels is around 25 °C, however the average temperature is around 500 °C. The PCHE has a relatively large primary channel measuring approximately 3 x 3 mm, and a steam channel measuring 2 x 1.5 mm. The finite element method (FEM) is applied to determine the stress by changing the misalignment to below 30% of the primary channel width. It was found that the current PCHE is operable up to 700 °C in terms of the ASME code under these design conditions. Additionally, the change of utilization factor due to the misalignment increases, but is still under the ASME acceptance criteria of 700 °C; however, it violates the criteria at 725 °C, which is the allowable temperature condition. Therefore, the mechanical integrity of the PCHE with low-pressure molten salt or liquid metal and a high-pressure steam channel is acceptable in terms of utilization factor.https://www.mdpi.com/2076-3417/10/6/2169pchefemmisalignmentstresschannelutilization factor |
| spellingShingle | Armanto P. Simanjuntak Jae Young Lee Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel Misalignment Applied Sciences pche fem misalignment stress channel utilization factor |
| title | Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel Misalignment |
| title_full | Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel Misalignment |
| title_fullStr | Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel Misalignment |
| title_full_unstemmed | Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel Misalignment |
| title_short | Mechanical Integrity Analysis of a Printed Circuit Heat Exchanger with Channel Misalignment |
| title_sort | mechanical integrity analysis of a printed circuit heat exchanger with channel misalignment |
| topic | pche fem misalignment stress channel utilization factor |
| url | https://www.mdpi.com/2076-3417/10/6/2169 |
| work_keys_str_mv | AT armantopsimanjuntak mechanicalintegrityanalysisofaprintedcircuitheatexchangerwithchannelmisalignment AT jaeyounglee mechanicalintegrityanalysisofaprintedcircuitheatexchangerwithchannelmisalignment |