A transient heat and mass transfer model of residential attics used to simulate radiant barrier retrofits. Part 1: Development

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Journal of Solar Energy Engineering

DOI:https://doi.org/10.1115/1.2888044· OSTI ID:616319

Medina, M A ^[1]; O`Neal, D L ^[2]; Turner, W D ^[3]

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1. Texas A and M Univ., Kingsville, TX (United States). Dept. of Mechanical and Industrial Engineering
2. Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
3. Texas Engineering Experiment Station, College Station, TX (United States). Energy Systems Lab.

This paper describes a transient heat and mass transfer model of residential attics. The model is used to predict hourly ceiling heat gain/loss in residences with the purpose of estimating reductions in cooling and heating loads produced by radiant barriers. The model accounts for transient conduction, convection, and radiation and incorporates moisture and air transport across the attic. Environmental variables, such as solar loads on outer attic surfaces and sky temperatures, are also estimated. The model is driven by hourly weather data which include: outdoor dry bulb air temperature, horizontal solar and sky radiation, wind speed and direction, relative humidity (or dew point), and cloud cover data. The output of the model includes ceiling heat fluxes, inner and outer heat fluxes from all surfaces, inner and outer surface temperatures, and attic dry bulb air temperatures. The calculated fluxes have been compared to experimental data of side-by-side testing of attics retrofit with radiant barriers. The model predicts ceiling heat flows with an error of less than 10% for most cases.

• Sponsoring Organization: USDOE
• OSTI ID: 616319
• Journal Information: Journal of Solar Energy Engineering, Journal Name: Journal of Solar Energy Engineering Journal Issue: 1 Vol. 120; ISSN JSEEDO; ISSN 0199-6231
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ATTICS
HEAT GAIN
HEAT LOSSES
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL MODELS
RETROFITTING
THERMAL INSULATION