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The Impact Of Roof Pitch And Ceiling Insulation On Cooling Load Of Naturally-Ventilated Attics, Shimin Wang, Zhigang Shen, Linxia Gu Jan 2012

The Impact Of Roof Pitch And Ceiling Insulation On Cooling Load Of Naturally-Ventilated Attics, Shimin Wang, Zhigang Shen, Linxia Gu

Durham School of Architectural Engineering and Construction: Faculty Publications

A 2D unsteady computational fluid dynamics (CFD) model is employed to simulate buoyancy-driven turbulent ventilation in attics with different pitch values and ceiling insulation levels under summer conditions. The impacts of roof pitch and ceiling insulation on the cooling load of gable-roof residential buildings are investigated based on the simulation of turbulent air flow and natural convection heat transfer in attic spaces with roof pitches from 3/12 to 18/12 combined with ceiling insulation levels from R-1.2 to R-40. The modeling results show that the air flows in the attics are steady and exhibit a general streamline pattern that is qualitatively …


A Study Of Selected Types Of Domestic Gas Stoves, Arnold E. Baragar Nov 1936

A Study Of Selected Types Of Domestic Gas Stoves, Arnold E. Baragar

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

During recent years several detailed investigations have been made concerning the proper design of domestic gas burners but there seems to be a need for information as to the performance of the burner when used in the modern gas range. Fortunately gas equipment must pass a set of exacting tests performed in the American Gas Association Testing Laboratory before being placed on the market as approved equipment, but as is emphasized in the preface of the A. G. A. "Approval Requirements for Gas Ranges" these are a set of minimum requirements. To the general public the great need is a …