Fabrication and design aspects of high-temperature compact diffusion bonded heat exchangers

Mylavarapu, Sai K.; Sun, Xiaodong; Christensen, Richard N.; Unocic, Raymond R.; Glosup, Richard E.; Patterson, Mike

doi:10.1016/j.nucengdes.2011.08.043

Cited by 115 publications

(40 citation statements)

References 2 publications

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“…Then, the photoresist is exposed to UV light via a photo-tool. Afterward, the exposed metal is dissolved via an etching process to form semi-circular channels with typical channel width of 0.5-2 mm (Mylavarapu et al, 2012). Lastly, the photoresist is removed using a solution like alkaline.…”

Section: Printed Circuit Heat Exchangers Using Photo-chemical Etchingmentioning

confidence: 99%

Recent Developments in High Temperature Heat Exchangers: A Review

Ohadi¹,

Zhang²,

Keramati³

et al. 2018

Frontiers in Heat and Mass Transfer

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Heat exchangers are key components of most power conversion systems, a few industrial sectors can particularly benefit from high temperature heat exchangers. Examples include conventional aerospace applications, advanced nuclear power generation systems, and high efficiency stationary and mobile modular fossil fuel to shaft power/electricity conversion systems. This paper provides a review of high temperature heat exchangers in terms of build materials, general design, manufacturing techniques, and operating parameters for the selected applications. Challenges associated with conventional and advanced fabrication technologies of high temperature heat exchangers are discussed. Finally, the paper outlines future research needs of high temperature heat exchangers.

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Section: Printed Circuit Heat Exchangers Using Photo-chemical Etchingmentioning

confidence: 99%

Recent Developments in High Temperature Heat Exchangers: A Review

Ohadi¹,

Zhang²,

Keramati³

et al. 2018

Frontiers in Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

“…Heat exchangers come in many configurations, but a promising design examined here is the compact heat exchanger or CHX-a plate-type heat exchanger in which many relatively thin layers of material containing channels for fluid flow are sandwiched together in an arrangement that provides for efficient countercurrent flow as shown in Figure 2 (Mylavarapu, Sun, Christensen, Unocic, Glosup, & Patterson, 2011), (Mylavarapu, 2011). The favorable fluid dynamics of such heat exchangers, along with their small size and modularity, makes them attractive as relatively low-cost, robust alternatives to more conventional designs.…”

Section: Heat Exchangersmentioning

confidence: 99%

“…The particular configuration shown here is also called a printed circuit heat exchanger (PCHE) because the channels are typically formed by a photolithography and etching process similar to those used for electronic printed circuit boards. (Mylavarapu, Sun, Christensen, Unocic, Glosup, & Patterson, 2011), (Mylavarapu, 2011) shows an actual PCHE assembled for testing in a helium loop at 900 °C. An actual large-scale energy application might be expected to use many such units assembled in series and/or parallel to achieve the needed heat transfer capacity.…”

Section: Heat Exchangersmentioning

confidence: 99%

Diffusion Welding of Alloys for Molten Salt Service - Status Report

Clark¹,

Mizia²,

Sabharwall³

2012

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This report addresses present work concerned with heat exchanger development for molten salt service, including the AHTR (Advanced High Temperature Reactor), which uses molten salt for cooling and process heat transfer. These results are an outgrowth of recent work done under the Next Generation Nuclear Plant (NGNP) Project, which was concerned with the diffusion welding of Alloys 800H, 617, and similar materials for oxidation resistance at operating temperatures up to 900 °C. The molten salt systems discussed herein use other alloys such as Alloy N and 242, which show corrosion resistance to molten salt at nominal operating temperatures up to 700 °C. These alloys were diffusion welded, typically at 1150 °C for 3 hours under applied loads of ~5 MPa using the Gleeble thermomechanical testing machine. Thermocalc/DICTRA models were developed to predict diffusion, and compositions of welds with a 15 µm nickel foil interlayer were measured after welding for comparison. Calculated and experimental values were in good agreement. Test specimens were prepared for exposing diffusion welds to molten salt environments. Alloy N and 242 were found to be weldable by diffusion welding, with ultimate tensile strengths about 90% of base metal values. Both diffusion welds and sheet material in Alloy N were corrosion tested in 58 mol% KF/42 mol%ZrF 4 at 650, 700, and 850 °C for 200, 500, and 1000 hours. Corrosion rates were similar between welded and nonwelded materials, typically <10 mils per year.

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“…The particular configuration shown here is also called a printed circuit heat exchanger (PCHE) because the channels are typically formed by a photolithography and etching process similar to those used for electronic printed circuit boards. Figure 3 shows an actual PCHE assembled for testing in a helium loop at 900°C, (Mylavarapu, Sun, Christensen, Unocic, Glosup, & Patterson, 2011), (Mylavarapu, 2011). An actual large-scale energy application might be expected to use many such units assembled in series and/or parallel to achieve the needed heat transfer capacity.…”

Section: Heat Exchangersmentioning

confidence: 99%

Diffusion Welding of Alloys for Molten Salt Service - Status Report

Clark¹,

Mizia²

2012

View full text Add to dashboard Cite

This report addresses present work concerned with heat exchanger development for molten salt service, including the AHTR (Advanced High Temperature Reactor), which uses molten salt for cooling and process heat transfer. These results are an outgrowth of recent work done under the Next Generation Nuclear Plant (NGNP) Project, which was concerned with the diffusion welding of Alloys 800H, 617, and similar materials for oxidation resistance at operating temperatures up to 900°C. The molten salt systems discussed herein use other alloys such as Alloy N and 242, which show corrosion resistance to molten salt at nominal operating temperatures up to 700°C. These alloys were diffusion welded, typically at 1150°C for 3 hours under applied loads of ~5 MPa using the Gleeble thermo-mechanical testing machine. Thermocalc/DICTRA models were developed to predict diffusion, and compositions of welds with a 15 µm nickel foil interlayer were measured after welding for comparison. Calculated and experimental values were in good agreement. Test specimens were prepared for exposing diffusion welds to molten salt environments. Alloy N and 242 were found to be weldable by diffusion welding, with ultimate tensile strengths about 90% of base metal values.

show abstract

Fabrication and design aspects of high-temperature compact diffusion bonded heat exchangers

Cited by 115 publications

References 2 publications

Recent Developments in High Temperature Heat Exchangers: A Review

Recent Developments in High Temperature Heat Exchangers: A Review

Diffusion Welding of Alloys for Molten Salt Service - Status Report

Diffusion Welding of Alloys for Molten Salt Service - Status Report

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