Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials

Verification of suitability of insulation testing rig (ITR) in determining the thermophysical properties of insulating materials (IM) is strongly based on the measurement of temperatures on the inner/outer surfaces of the insulators (white cotton fabric, molded ash, molded rice husk and molded sawdu...

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Autores principales:	S. N. Nnamchi, O. A. Nnamchi, O. S. Odebiyi, O. O. Edosa, T. Wanazusi
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2019
Materias:	experimental verification and heat transfer composite/monolithic insulating materials heat rejection factor insulation parameter thermal conductivity and diffusivity insulation testing rig Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/730146dc65094eab96c359d3a0e58773
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spelling	oai:doaj.org-article:730146dc65094eab96c359d3a0e587732021-11-04T15:51:56ZExperimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials2331-191610.1080/23311916.2019.1657264https://doaj.org/article/730146dc65094eab96c359d3a0e587732019-01-01T00:00:00Zhttp://dx.doi.org/10.1080/23311916.2019.1657264https://doaj.org/toc/2331-1916Verification of suitability of insulation testing rig (ITR) in determining the thermophysical properties of insulating materials (IM) is strongly based on the measurement of temperatures on the inner/outer surfaces of the insulators (white cotton fabric, molded ash, molded rice husk and molded sawdust), outer surface of mild steel, and the temperatures of the external/internal heat transfer fluids (air/water). The dimensionless excess temperature (heat rejection factor(HRF)) was determined as the ratio of IM to mild steel excess temperature. Thermal balance on the IM led to mechanistic thermal equation whose coefficient yielded the insulation parameter, which is synonymous with the fin parameter. The thermal conductivity of the insulators was uniquely determined as a function of HRF, geometric shapes of the insulator/mild steel, and the internal/external fluid properties. Distinctively, the thermal diffusivity was determined as function of rate of dimensionless excess temperature and the insulation parameter rather than as ratio of thermal conductivity to thermal storage capacity. Essentially, the thermal conductivity determined for the above-mentioned IM were; 0.0597, 0.0377–0.0555, 0.0251–0.0344 and 0.0110–0.0293 W/mK, respectively. The thermal diffusivity obtained for the aforementioned IM were; 3.443, 1.3008–1.9302, 1.0384–1.4418 and 0.2499–0.8384 m2/s, respectively. The empirical results produced the numerical values of the four cardinal thermophysical properties, which unanimously agreed with the established results in literature. This agreement substantiates the fact that ITR is quite suitable in determining the thermophysical properties of future insulators. Therefore, this study strongly endorses the application of ITR for characterization and development of fibrous agricultural wastes as insulators.S. N. NnamchiO. A. NnamchiO. S. OdebiyiO. O. EdosaT. WanazusiTaylor & Francis Grouparticleexperimental verification and heat transfercomposite/monolithic insulating materialsheat rejection factorinsulation parameterthermal conductivity and diffusivityinsulation testing rigEngineering (General). Civil engineering (General)TA1-2040ENCogent Engineering, Vol 6, Iss 1 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	experimental verification and heat transfer composite/monolithic insulating materials heat rejection factor insulation parameter thermal conductivity and diffusivity insulation testing rig Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	experimental verification and heat transfer composite/monolithic insulating materials heat rejection factor insulation parameter thermal conductivity and diffusivity insulation testing rig Engineering (General). Civil engineering (General) TA1-2040 S. N. Nnamchi O. A. Nnamchi O. S. Odebiyi O. O. Edosa T. Wanazusi Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials
description	Verification of suitability of insulation testing rig (ITR) in determining the thermophysical properties of insulating materials (IM) is strongly based on the measurement of temperatures on the inner/outer surfaces of the insulators (white cotton fabric, molded ash, molded rice husk and molded sawdust), outer surface of mild steel, and the temperatures of the external/internal heat transfer fluids (air/water). The dimensionless excess temperature (heat rejection factor(HRF)) was determined as the ratio of IM to mild steel excess temperature. Thermal balance on the IM led to mechanistic thermal equation whose coefficient yielded the insulation parameter, which is synonymous with the fin parameter. The thermal conductivity of the insulators was uniquely determined as a function of HRF, geometric shapes of the insulator/mild steel, and the internal/external fluid properties. Distinctively, the thermal diffusivity was determined as function of rate of dimensionless excess temperature and the insulation parameter rather than as ratio of thermal conductivity to thermal storage capacity. Essentially, the thermal conductivity determined for the above-mentioned IM were; 0.0597, 0.0377–0.0555, 0.0251–0.0344 and 0.0110–0.0293 W/mK, respectively. The thermal diffusivity obtained for the aforementioned IM were; 3.443, 1.3008–1.9302, 1.0384–1.4418 and 0.2499–0.8384 m2/s, respectively. The empirical results produced the numerical values of the four cardinal thermophysical properties, which unanimously agreed with the established results in literature. This agreement substantiates the fact that ITR is quite suitable in determining the thermophysical properties of future insulators. Therefore, this study strongly endorses the application of ITR for characterization and development of fibrous agricultural wastes as insulators.
format	article
author	S. N. Nnamchi O. A. Nnamchi O. S. Odebiyi O. O. Edosa T. Wanazusi
author_facet	S. N. Nnamchi O. A. Nnamchi O. S. Odebiyi O. O. Edosa T. Wanazusi
author_sort	S. N. Nnamchi
title	Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials
title_short	Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials
title_full	Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials
title_fullStr	Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials
title_full_unstemmed	Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials
title_sort	experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials
publisher	Taylor & Francis Group
publishDate	2019
url	https://doaj.org/article/730146dc65094eab96c359d3a0e58773
work_keys_str_mv	AT snnnamchi experimentalverificationofsuitabilityofinsulationtestingrigindeterminingthermophysicalpropertiesofinsulatingmaterials AT oannamchi experimentalverificationofsuitabilityofinsulationtestingrigindeterminingthermophysicalpropertiesofinsulatingmaterials AT osodebiyi experimentalverificationofsuitabilityofinsulationtestingrigindeterminingthermophysicalpropertiesofinsulatingmaterials AT ooedosa experimentalverificationofsuitabilityofinsulationtestingrigindeterminingthermophysicalpropertiesofinsulatingmaterials AT twanazusi experimentalverificationofsuitabilityofinsulationtestingrigindeterminingthermophysicalpropertiesofinsulatingmaterials
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Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials

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