Numerical and experimental investigation of coupled radiative and conductive transient heat transfer in fibrous insulations

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5395061

Rish, III, J W

Heat transfer results are presented for fibrous insulations (fiberglass) undergoing coupled transient conduction and radiation heat transfer under the influence of a temporally varying incident radiative flux and with temporally varying temperature boundaries. The heat transfer analysis was performed by solving the one-dimensional radiative transport equation for an absorbing, emitting, and scattering medium simultaneously with the one-dimensional energy equation. An iterative solution procedure was used in which the radiative transport equation was solved by the method of discrete ordinates, and where the energy equation was solved numerically with a control volume based finite difference scheme. The study was extended to include an analysis of the influence of reflective radiant barriers on the total heat transfer through the fiberglass by making appropriate adjustments to the radiative boundary conditions. Boundary conditions used in this analysis correspond to situations that would be typical of residential attics for a number of seasonal conditions. Validation of the heat-transfer model was accomplished by making comparisons first with steady-state guarded hot-plate measurements available in the open literature, then with transient heat transfer measurements published by the Florida Solar Energy Center. Agreement between the experimental and analytical results was found to be good in both cases.

• Research Organization: Mississippi Univ., University (USA)
• OSTI ID: 5395061
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320100* -- Energy Conservation
Consumption
& Utilization-- Buildings
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
BOUNDARY CONDITIONS
ENERGY TRANSFER
FIBERGLASS
FINITE DIFFERENCE METHOD
HEAT TRANSFER
ITERATIVE METHODS
NUMERICAL SOLUTION
ONE-DIMENSIONAL CALCULATIONS
RADIANT HEAT TRANSFER
THERMAL CONDUCTION
THERMAL INSULATION