{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/81623"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/81623","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Development of a compensation chamber for use in a multiple condenser loop heat pipe","abstract":"The performance of many electronic devices is presently limited by heat dissipation rates. One potential solution lies in high-performance air-cooled heat exchangers like PHUMP, the multiple condenser loop heat pipe presented here. This device features a number of design improvements that lead to significant increases in performance relative to state of the art heat exchangers. In this work, a compensation chamber is developed and implemented to ensure the operational stability of the device across a wide range of operating conditions. A computational model of the device was developed using COMSOL Multiphysics v3.5a to allow for design optimization and performance evaluation. The accuracy of this computational model was established by comparing simulation results to experimental data. Analytical models were used to identify operating points of interest, which were simulated to compare the performance of various designs. The final design featured reduced thermal resistance between the vapor in the evaporator and the compensation chamber, and increased thermal resistance between the compensation chamber and the ambient air relative to past designs. This design reduced the risk of condenser flooding and evaporator dry out, improving the operational stability of the device. This design was implemented into a ten-condenser prototype, where experiments validated its performance. The compensation chamber did not require any electrical heaters, reducing the power consumption of the device and increasing its COP. Finally, general recommendations and guidelines are presented for use during the design process of future compensation chambers.","abstract_html":"The performance of many electronic devices is presently limited by heat dissipation rates. One potential solution lies in high-performance air-cooled heat exchangers like PHUMP, the multiple condenser loop heat pipe presented here. This device features a number of design improvements that lead to significant increases in performance relative to state of the art heat exchangers. In this work, a compensation chamber is developed and implemented to ensure the operational stability of the device across a wide range of operating conditions. A computational model of the device was developed using COMSOL Multiphysics v3.5a to allow for design optimization and performance evaluation. The accuracy of this computational model was established by comparing simulation results to experimental data. Analytical models were used to identify operating points of interest, which were simulated to compare the performance of various designs. The final design featured reduced thermal resistance between the vapor in the evaporator and the compensation chamber, and increased thermal resistance between the compensation chamber and the ambient air relative to past designs. This design reduced the risk of condenser flooding and evaporator dry out, improving the operational stability of the device. This design was implemented into a ten-condenser prototype, where experiments validated its performance. The compensation chamber did not require any electrical heaters, reducing the power consumption of the device and increasing its COP. Finally, general recommendations and guidelines are presented for use during the design process of future compensation chambers.","abstract_has_math":false,"creators":["Roche, Nicholas Albert"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Mechanical Engineering.","school":null,"contributors":[],"advisors":["John G. Brisson."],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013","date_published":"2013","updated_at":"2026-07-22T22:21:55Z","subjects":["Mechanical Engineering."],"languages":["eng"],"rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/81623","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["John G. Brisson."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Department of Mechanical Engineering."]},{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["Massachusetts Institute of Technology. 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They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/81623"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.","Cataloged from PDF version of thesis.","Includes bibliographical references (p. 89-90)."]},{"key":"dc:description.abstract","label":"Abstract","values":["The performance of many electronic devices is presently limited by heat dissipation rates. One potential solution lies in high-performance air-cooled heat exchangers like PHUMP, the multiple condenser loop heat pipe presented here. This device features a number of design improvements that lead to significant increases in performance relative to state of the art heat exchangers. In this work, a compensation chamber is developed and implemented to ensure the operational stability of the device across a wide range of operating conditions. A computational model of the device was developed using COMSOL Multiphysics v3.5a to allow for design optimization and performance evaluation. The accuracy of this computational model was established by comparing simulation results to experimental data. Analytical models were used to identify operating points of interest, which were simulated to compare the performance of various designs. The final design featured reduced thermal resistance between the vapor in the evaporator and the compensation chamber, and increased thermal resistance between the compensation chamber and the ambient air relative to past designs. This design reduced the risk of condenser flooding and evaporator dry out, improving the operational stability of the device. This design was implemented into a ten-condenser prototype, where experiments validated its performance. The compensation chamber did not require any electrical heaters, reducing the power consumption of the device and increasing its COP. Finally, general recommendations and guidelines are presented for use during the design process of future compensation chambers."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.M."]},{"key":"dc:title","label":"Title","values":["Development of a compensation chamber for use in a multiple condenser loop heat pipe"]}]}],"canonical_facts":{"dc:contributor.advisor":["John G. Brisson."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Mechanical Engineering."],"dc:contributor.other":["Massachusetts Institute of Technology. Department of Mechanical Engineering."],"dc:creator":["Roche, Nicholas Albert"],"dc:date.accessioned":["2013-10-24T17:36:12Z"],"dc:date.available":["2013-10-24T17:36:12Z"],"dc:date.issued":["2013"],"dc:description":["Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.","Cataloged from PDF version of thesis.","Includes bibliographical references (p. 89-90)."],"dc:description.abstract":["The performance of many electronic devices is presently limited by heat dissipation rates. One potential solution lies in high-performance air-cooled heat exchangers like PHUMP, the multiple condenser loop heat pipe presented here. This device features a number of design improvements that lead to significant increases in performance relative to state of the art heat exchangers. In this work, a compensation chamber is developed and implemented to ensure the operational stability of the device across a wide range of operating conditions. A computational model of the device was developed using COMSOL Multiphysics v3.5a to allow for design optimization and performance evaluation. The accuracy of this computational model was established by comparing simulation results to experimental data. Analytical models were used to identify operating points of interest, which were simulated to compare the performance of various designs. The final design featured reduced thermal resistance between the vapor in the evaporator and the compensation chamber, and increased thermal resistance between the compensation chamber and the ambient air relative to past designs. This design reduced the risk of condenser flooding and evaporator dry out, improving the operational stability of the device. This design was implemented into a ten-condenser prototype, where experiments validated its performance. The compensation chamber did not require any electrical heaters, reducing the power consumption of the device and increasing its COP. Finally, general recommendations and guidelines are presented for use during the design process of future compensation chambers."],"dc:description.degree":["S.M."],"dc:identifier.uri":["http://hdl.handle.net/1721.1/81623"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. 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