Measuring the effective thermal resistance of ventilated air-spaces behind common wall assemblies: theoretical uncertainty analysis and recommendations for the hot box method modifications (ASHRAE 1759-RP)

2021 ◽  
pp. 1-26
Author(s):  
Mohammad Rahiminejad ◽  
Dolaana Khovalyg
Keyword(s):  
Thermal Resistance ◽  
Uncertainty Analysis ◽  
Theoretical Uncertainty ◽  
Common Wall ◽  
Box Method

Calculation and Experimental Evaluation of the Thermal Resistance of a Structure with Reflective Insulation

2014 ◽  
Vol 899 ◽  
pp. 374-380 ◽  
Author(s):  
Jiří Kalánek ◽  
Libor Šteffek ◽  
Milan Ostrý
Keyword(s):  
Thermal Properties ◽  
Thermal Resistance ◽  
Thermal Insulation ◽  
Experimental Methods ◽  
Test Element ◽  
Normative Requirements ◽  
Box Method ◽  
Insulation Performance ◽  
Heat Transfer By Radiation

As reason of increasing requirements of thermal insulation properties of the exposed envelope, reflective insulation are among kind of modern thermal insulation materials ones, which can significantly increased thermal insulation performance if their application is correct. Thermal insulation performance is caused by reduction of the heat transfer by radiation. Conjunction of low-emissivity surface of the reflective insulation and air layer is important to account. This article is focused on the determination of thermal properties of reflective insulation and the results of measured values thermal resistance of determination by hot box method using heat flow meter are presented here. As part of determination of thermal properties of reflective insulation by experimental methods, the test element used to measure the thermal resistance of an insulated air cavity had to be created for concordance with the normative requirements. The part of this article is determination of the thermal resistance by the calculation of derived physical relations and comparison with values of the laboratory measurement.

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