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Abstract
A large scale model of an attic construction has been built in a climatic chamber. The purpose of the attic test model is to investigate heat transfer - in particular, heat transfer by convection - in loose fille attic insulation. The influence of a number of factors on heat flows can be investigaged using the attic test model; for example, insulation thickness, attic ventilation, ceiling construction, roof slopes, and the quality of installtion workmanship. The heat flow through the attic ceiling construction is measured with a metering box. The design and calibration of the metering box is described in detail in this paper. During calibration ofthe metering box, the thermal conductivity of the calibration board was determinediwithin 0.6% of that determined at the Swedish National Testing and Research Institute. Computer simulations crried out to help design the attic test model adn to predict the function of the metering box are presented. The location of convection cells in the loose fill insulation will be determined by investigating the temperature variations on the surface of the insulation by using the thermocouples and an infrared camera. The preliminary test program for the attic test model isalso presented.
A large scale model of an attic construction has been built in a climatic chamber. The purpose of the attic test model is to investigate heat transfer - in particular, heat transfer by convection - in loose fille attic insulation. The influence of a number of factors on heat flows can be investigaged using the attic test model; for example, insulation thickness, attic ventilation, ceiling construction, roof slopes, and the quality of installtion workmanship. The heat flow through the attic ceiling construction is measured with a metering box. The design and calibration of the metering box is described in detail in this paper. During calibration ofthe metering box, the thermal conductivity of the calibration board was determinediwithin 0.6% of that determined at the Swedish National Testing and Research Institute. Computer simulations crried out to help design the attic test model adn to predict the function of the metering box are presented. The location of convection cells in the loose fill insulation will be determined by investigating the temperature variations on the surface of the insulation by using the thermocouples and an infrared camera. The preliminary test program for the attic test model isalso presented.
Date
12/1998
12/1998
Author(s)
Paula Wahlgren
Paula Wahlgren
Page(s)
55-63
55-63
Keyword(s)
insulation; attic; convection; heat transfer
insulation; attic; convection; heat transfer