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METHOD FOR ASSESSING THE LONG-TERM THERMAL RESISTANCE OF CLOSED-CELL THERMAL INSULATING FOAMS AT MULTIPLE MEAN TEMPERATURES
METHOD FOR ASSESSING THE LONG-TERM THERMAL RESISTANCE OF CLOSED-CELL THERMAL INSULATING FOAMS AT MULTIPLE MEAN TEMPERATURES
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机译:用于评估多种平均温度下闭孔热绝缘泡沫的长期热阻的方法
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摘要
Methods for measuring long-term thermal resistance of closed-cell foam. The methods include: (a) placing a stack of slices cut from a sample of the foam between two isothermal plates in a calibrated heat flow meter comprising a heat flux transducer; (b) measuring an initial thermal resistance of the same stack of slices at a plurality of preselected mean temperatures within the temperature range of 10° F. to 150° F., wherein the stack of foam slices stays inside the heat flow meter throughout step (b); (c) at a time calculated to represent a selected aging period of the foam, placing the same stack of slices between two isothermal plates in a calibrated heat flow meter and measuring the thermal resistance of the stack of slices at a plurality of preselected mean temperatures within the temperature range of 10° F. to 150° F., wherein the stack of foam slices stays inside the heat flow meter throughout the measuring portion of step (c); and (d) calculating the long-term thermal resistance of the foam at each of the plurality of preselected mean temperatures
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