{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/139959"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/139959","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Drawn Polymer Fiber Recuperative Heat Exchangers","abstract":"Polymer microchannel heat exchangers for use in cryocooler applications have been developed. These heat exchangers are manufactured using a thermal drawing process where a bulk polymer preform is heated and stretched. The process results in channels with a characteristic dimension of 50-100 µm and with an overall length of many meters. The drawn heat exchangers are lightweight, flexible, and have a large surface-area-to-volume ratio. Initial tests on a Joule-Thomson cryocooler with a heat exchanger of overall dimension of 2.5mm x 2.5mm x 400mm with nitrogen as a working fluid were performed. Nitrogen was successfully liquefied with a mass flow rate of 34 mg/s and cooling power of 200 mW at 80 K.","abstract_html":"Polymer microchannel heat exchangers for use in cryocooler applications have been developed. These heat exchangers are manufactured using a thermal drawing process where a bulk polymer preform is heated and stretched. The process results in channels with a characteristic dimension of 50-100 µm and with an overall length of many meters. The drawn heat exchangers are lightweight, flexible, and have a large surface-area-to-volume ratio. Initial tests on a Joule-Thomson cryocooler with a heat exchanger of overall dimension of 2.5mm x 2.5mm x 400mm with nitrogen as a working fluid were performed. Nitrogen was successfully liquefied with a mass flow rate of 34 mg/s and cooling power of 200 mW at 80 K.","abstract_has_math":false,"creators":["Adams, Jacob"],"institution":"Massachusetts Institute of Technology","degree_name":"Master","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. 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These heat exchangers are manufactured using a thermal drawing process where a bulk polymer preform is heated and stretched. The process results in channels with a characteristic dimension of 50-100 µm and with an overall length of many meters. The drawn heat exchangers are lightweight, flexible, and have a large surface-area-to-volume ratio. Initial tests on a Joule-Thomson cryocooler with a heat exchanger of overall dimension of 2.5mm x 2.5mm x 400mm with nitrogen as a working fluid were performed. Nitrogen was successfully liquefied with a mass flow rate of 34 mg/s and cooling power of 200 mW at 80 K."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.M."]},{"key":"dc:title","label":"Title","values":["Drawn Polymer Fiber Recuperative Heat Exchangers"]}]}],"canonical_facts":{"dc:contributor.advisor":["Brisson, John"],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Nuclear Science and Engineering"],"dc:creator":["Adams, Jacob"],"dc:date.accessioned":["2022-02-07T15:15:46Z"],"dc:date.available":["2022-02-07T15:15:46Z"],"dc:date.issued":["2021-09"],"dc:description.abstract":["Polymer microchannel heat exchangers for use in cryocooler applications have been developed. These heat exchangers are manufactured using a thermal drawing process where a bulk polymer preform is heated and stretched. The process results in channels with a characteristic dimension of 50-100 µm and with an overall length of many meters. The drawn heat exchangers are lightweight, flexible, and have a large surface-area-to-volume ratio. Initial tests on a Joule-Thomson cryocooler with a heat exchanger of overall dimension of 2.5mm x 2.5mm x 400mm with nitrogen as a working fluid were performed. Nitrogen was successfully liquefied with a mass flow rate of 34 mg/s and cooling power of 200 mW at 80 K."],"dc:description.degree":["S.M."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/139959"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["In Copyright - Educational Use Permitted","Copyright MIT"],"dc:rights.uri":["http://rightsstatements.org/page/InC-EDU/1.0/"],"dc:title":["Drawn Polymer Fiber Recuperative Heat Exchangers"],"dc:type":["Thesis"],"thesis:degree_name":["Master","Master of Science in Nuclear Science and Engineering"]},"updated_at":"2026-07-22T22:21:52Z"}