US 2021/0172893 A1 · METHOD FOR ASSESSING THE LONG-TERM THERMAL RESISTANCE OF CLOSED-CELL THERMAL INSULATING FOAMS AT MULTIPLE MEAN TEMPERATURES

Abstract

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

Claims20

Dependent claims

A method for measuring long-term thermal resistance of closed-cell foam, comprising:

(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 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.

2 more elements

A method for measuring long-term thermal resistance of closed-cell foam board, comprising:

(a) measuring an initial thermal resistance of a full thickness sample of the foam board by placing the full thickness sample between two isothermal plates in a calibrated heat flow meter comprising a heat flux transducer, the initial thermal resistance of the full thickness sample being determined at a plurality of preselected mean temperatures within the temperature range of 10° F. to 150° F., wherein the full thickness sample is kept inside the heat flow meter throughout step (a);
(b) preparing a stack of core slices and a stack of surface slices from the foam board;
(c) placing a stack of slices from the foam board between two isothermal plates in a calibrated heat flow meter comprising a heat flux transducer;
(d) measuring an initial thermal resistance of the slack of foam board slices at a plurality of preselected mean temperatures within the temperature range of 10° F. to 150° F., such measurement occurring within 14 days after the foam board is produced, wherein the stack of foam slices is kept inside the heat flow meter throughout step (d);
(e) removing the stack of foam slices from the heat flow meter;
(f) at a time calculated to represent a selected aging period of the foam, placing the 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 is kept inside the heat flow meter through step (f);
(g) repeating steps (c) through (f) for each stack of core slices and each stack of surface slices prepared in step (b);
(h) determining an aging factor of each stack of core slices and each stack of surface slices at each of the plurality of preselected mean temperatures;
and
(i) calculating the long-term thermal resistance of the foam board at each of the plurality of mean temperatures.

7 more elements

Dependencies are inferred from the claim text.

Method for assessing the long-term thermal resistance of closed-cell thermal insulating foams at multiple mean temperatures

Life of this patent

Method for assessing the long-term thermal resistance of closed-cell thermal insulating foams at multiple mean temperatures

Life of this patent

Abstract

Claims20