Affiliation:
1. Department of Mechanical Engineering University of Mississippi
University, MS 38677
Abstract
This research investigates the effects on the total heat transfer when various substrate barriers are implemented at the bottom of a R-19 fiberglass insula tion batt. A plastic (polyethylene) vapor barrier and perforated and non-perforated radiant barriers are investigated. Heat transport in ceiling insulation is assumed to be transferred by these three mechanisms: conduction, radiation heat transfer, and mois ture transport (please note that convection heat transfer is not considered in this in vestigation). By modeling each of these three modes of heat transfer at the attic in sulation substrate, the total heat transfer into the house (summer conditions) can be obtained. Further modeling can determine the changes in the three individual modes of heat transfer once a substrate barrier is added. Summertime experimental data were collected at an occupied North Mississippi residence for cases with and without a vapor barrier at the substrate for R-19 fiberglass insulation. Predictions were made by a transient numerical/analytical model that simultaneously combines conduction and volumetric radiation heat transfer and moisture transport to obtain the total heat transfer at the substrate. Experimentally and predicted total heat transfer results are compared. Profiles such as temperature-time histories and vapor H2O concentrations are presented to support the experimentally determined effects on the overall heat transfer at the substrate.
Reference20 articles.
1. Moisture measurements in single-family houses with attics containing radiant barriers
2. Gorthala, R., J.A. Roux and P.W. Fairey III. 1991. "Combined Conduction, Radiation Heat Transfer and Mass Transfer in Fibrous Attic Insulations," Insulation Materials: Testing and Applications, 2nd Volume, ASTM STP 111. Philadelphia: American Society for Testing and Materials , pp. 371-386.
3. Transient conductive, radiative heat transfer coupled with moisture transport in attic insulations
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献