Summary of calibrated hot box test results for twenty-one wall assemblies

Conference · Wed Jan 01 04:00:00 EST 1986 · ASHRAE Trans.; (United States)

OSTI ID:6565426

Van Geem, M G

Alternative wall systems are frequently evaluated by comparing steady-state heat transmission coefficients, such as U- and R-values. Steady-state transmission coefficients do not adequately describe thermal performance under dynamic temperature conditions. Laboratory results of building envelope components tested under steady-state and dynamic temperature conditions can be used to develop methods of more accurately predicting heat losses and gains to the building envelope. The thermal characteristics of 21 wall assemblies, including different types of masonry and wood-frame walls and two standard calibration assemblies, have been measured using a calibrated hot box in general accordance with ASTM C976. Results presenting steady-state, transient, and periodic performance have been assembled in two manuals. This paper summarizes the results. Steady-state values are used to obtain average heat transmission coefficients such as U- and R-values, and the measured values are compared to those calculated from material properties. The transient and periodic dynamic tests provide data on thermal performance under controlled conditions that simulate actual temperature changes in building envelopes. Measured results are compared to values predicted by steady-state analysis. The difference between measured and predicted results is shown to be due in general to thermal storage capacity of the assembly.

• Research Organization: Construction Technology Labs., a Div. of the Portland Cement Association, Skokie, IL 60077
• OSTI ID: 6565426
• Report Number(s): CONF-8606125-
• Conference Information: Journal Name: ASHRAE Trans.; (United States) Journal Volume: 92:2B
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320107* -- Energy Conservation
Consumption
& Utilization-- Building Systems-- (1987-)
BENCH-SCALE EXPERIMENTS
BUILDINGS
CALIBRATION
DATA ANALYSIS
ENERGY STORAGE
ENERGY TRANSFER
HEAT STORAGE
HEAT TRANSFER
PERFORMANCE TESTING
R FACTORS
STEADY-STATE CONDITIONS
STORAGE
TEST FACILITIES
TESTING
THERMAL INSULATION
TRANSIENTS
U VALUES
WALLS