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An accurate calorimeter-based method for the thermal characterization of heat pipes

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Show simple item record Mooney, Joseph P. Punch, Jeff Jeffers, Nick Egan, Vanessa 2021-04-19T14:09:19Z 2021-04-19T14:09:19Z 2021
dc.description peer-reviewed en_US
dc.description.abstract This study presents a method that can be used to accurately determine the thermal performance of a cylindrical heat pipe. In the method, the heat pipe is placed between two stainless steel 304 cylindrical blocks, configured as radial calorimeters that achieve thermal contact with the evaporator and condenser sections of the pipe. A flexible isothermal electrical heater mat surrounds the evaporator block, and a liquid-cooled copper pipe wrapped around the condenser block is used to remove heat. High precision thermistors (±0.01 K) positioned at fixed radial locations within the calorimeters are used to measure the heat supplied to the evaporator and the heat extracted from the condenser. One-dimensional radial conduction is assumed to occur within each calo rimeter, and this enables the quantification of heat flows from the temperature readings. This assumption is verified by a steady-state analysis of the radial, axial and circumferential temperature differences within the evaporator calorimeter, based on data recorded for the lowest and highest heat inputs. Furthermore, a numerical model is used to confirm that end effects have a negligible influence on radial conduction within each calo rimeter. This study concludes that the most commonly used characterization techniques for heat pipes can greatly overestimate thermal performance (15–32% for input powers of 7.5–25 W respectively) due to inaccurate quantification of heat flows into the evaporator and from the condenser. The calorimetric technique reported here achieves uncertainties in thermal resistance of <7.5% for low thermal loads (<12.5 W) and <6% for higher loads (>12.5 W). Moreover, the method achieves a significant improvement in the experimental thermal effi ciency, with values of >75% recorded for all heat inputs in this study. The use of radial calorimeters in the current study obviates the requirement for calculating the losses from the heater to ambient, hence achieving low uncertainties in thermal resistance and effective thermal conductivity for a range of heat inputs. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Experimental Thermal and Fluid Science;125, 110381
dc.subject heat pipes en_US
dc.subject thermal characteristics en_US
dc.subject thermal resistance en_US
dc.subject effective thermal conductivity en_US
dc.title An accurate calorimeter-based method for the thermal characterization of heat pipes en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.expthermflusci.2021.110381
dc.contributor.sponsor SFI en_US
dc.contributor.sponsor ERDF en_US
dc.contributor.sponsor European Union (EU) en_US
dc.relation.projectid 13/RC/2077 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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