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Title: Moisture measurements in single-family houses with attics containing radiant barriers

Abstract

A national laboratory tested radiant barriers in attics of three unoccupied research houses located near Knoxville, TN. The purpose of these tests was to determine the effect of moisture condensation on the underside of perforated horizontal radiant barriers during the winter. THe houses were operated at high indoor relative humidities (45% and 55% at 70{degrees}F). Attic moisture conditions were monitored with both instrumented measurements and visual observations. The observations showed that moisture went through a diurnal cycle at the research houses. Moisture could condense on the bottom surface of the horizontal radiant barrier in weather below 35{degrees}F, but is would also dissipate to the attic air during a normal Tennessee winter afternoon, leaving the barrier dry. However, in long periods of subfreezing weather, all condensation did not vaporize and some remained on the surface throughout the day. The data show that a moisture cycle occurring on a perforate horizontal barrier during a typical Tennessee winter caused no structural, wet insulation, or stained ceiling problems to the research houses, even though the houses were maintained at unusually high indoor relative humidities.

Authors:
;  [1];  [2]
  1. Oak Ridge National Lab., Oak Ridge, TN (US)
  2. Tennessee Valley Authority, Chattanooga, TN (US)
Publication Date:
OSTI Identifier:
5864389
Report Number(s):
CONF-890609-
Journal ID: ISSN 0001-2505; CODEN: ASHTA
Resource Type:
Conference
Journal Name:
ASHRAE Transactions (American Society of Heating, Refrigerating and Air-Conditioning Engineers); (USA)
Additional Journal Information:
Journal Volume: 95, Part 2; Conference: 1989 ASHRAE annual meeting, Vancouver (Canada), 25-28 Jun 1989; Journal ID: ISSN 0001-2505
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ATTICS; RADIANT HEAT TRANSFER; HOUSES; MOISTURE; CLIMATES; THERMAL INSULATION; BUILDINGS; ENERGY TRANSFER; HEAT TRANSFER; RESIDENTIAL BUILDINGS; 320107* - Energy Conservation, Consumption, & Utilization- Building Systems- (1987-)

Citation Formats

Levins, W P, Karnitz, M A, and Hall, J A. Moisture measurements in single-family houses with attics containing radiant barriers. United States: N. p., 1989. Web.
Levins, W P, Karnitz, M A, & Hall, J A. Moisture measurements in single-family houses with attics containing radiant barriers. United States.
Levins, W P, Karnitz, M A, and Hall, J A. Sun . "Moisture measurements in single-family houses with attics containing radiant barriers". United States.
@article{osti_5864389,
title = {Moisture measurements in single-family houses with attics containing radiant barriers},
author = {Levins, W P and Karnitz, M A and Hall, J A},
abstractNote = {A national laboratory tested radiant barriers in attics of three unoccupied research houses located near Knoxville, TN. The purpose of these tests was to determine the effect of moisture condensation on the underside of perforated horizontal radiant barriers during the winter. THe houses were operated at high indoor relative humidities (45% and 55% at 70{degrees}F). Attic moisture conditions were monitored with both instrumented measurements and visual observations. The observations showed that moisture went through a diurnal cycle at the research houses. Moisture could condense on the bottom surface of the horizontal radiant barrier in weather below 35{degrees}F, but is would also dissipate to the attic air during a normal Tennessee winter afternoon, leaving the barrier dry. However, in long periods of subfreezing weather, all condensation did not vaporize and some remained on the surface throughout the day. The data show that a moisture cycle occurring on a perforate horizontal barrier during a typical Tennessee winter caused no structural, wet insulation, or stained ceiling problems to the research houses, even though the houses were maintained at unusually high indoor relative humidities.},
doi = {},
url = {https://www.osti.gov/biblio/5864389}, journal = {ASHRAE Transactions (American Society of Heating, Refrigerating and Air-Conditioning Engineers); (USA)},
issn = {0001-2505},
number = ,
volume = 95, Part 2,
place = {United States},
year = {1989},
month = {1}
}

Conference:
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