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Overview of Thermal Performance of Air Cavities and Reflective Insulations
Many parts of the building components such as walls, and flat and sloped roofs contain enclosed airspaces. In addition, the Insulating Glass Units (IGUs) in fenestration systems such as curtain walls, windows and skylight devices contain enclosed spaces that are normally filled with air or heavy gas such as Argon, Xenon or Krypton. The thermal resistance (R-value) of an enclosed space depends mainly on the type of the filling gas, emissivity of all surfaces that bound the space, the size and orientation of the space, the direction of heat flow through the space, and the respective temperatures of all surfaces that define the space. Assessing the energy performance of building envelopes with reflective insulations and fenestration systems, subjected to different climatic conditions, require accurate determination of the R-values of the enclosed spaces. In this chapter, a review was conducted on the thermal performance of enclosed airspaces for different building applications. As well, the different parameters that affect the thermal performance of enclosed airspaces were discussed. These parameters include: (a) dimensions, (b) inclination angles, (c) directions of heat flow, (d) emissivity of all surfaces that bound the space, and (e) operating conditions.
Overview of Thermal Performance of Air Cavities and Reflective Insulations
Many parts of the building components such as walls, and flat and sloped roofs contain enclosed airspaces. In addition, the Insulating Glass Units (IGUs) in fenestration systems such as curtain walls, windows and skylight devices contain enclosed spaces that are normally filled with air or heavy gas such as Argon, Xenon or Krypton. The thermal resistance (R-value) of an enclosed space depends mainly on the type of the filling gas, emissivity of all surfaces that bound the space, the size and orientation of the space, the direction of heat flow through the space, and the respective temperatures of all surfaces that define the space. Assessing the energy performance of building envelopes with reflective insulations and fenestration systems, subjected to different climatic conditions, require accurate determination of the R-values of the enclosed spaces. In this chapter, a review was conducted on the thermal performance of enclosed airspaces for different building applications. As well, the different parameters that affect the thermal performance of enclosed airspaces were discussed. These parameters include: (a) dimensions, (b) inclination angles, (c) directions of heat flow, (d) emissivity of all surfaces that bound the space, and (e) operating conditions.
Overview of Thermal Performance of Air Cavities and Reflective Insulations
Green Energy,Technology
Kośny, Jan (editor) / Yarbrough, David W. (editor) / Saber, Hamed H. (author)
Thermal Insulation and Radiation Control Technologies for Buildings ; Chapter: 3 ; 55-81
2022-06-07
27 pages
Article/Chapter (Book)
Electronic Resource
English
Reflective insulations , Effective emittance , Airspace aspect ratio , R-value correlation , Low emissivity materials , Insulating glass units Energy , Sustainable Architecture/Green Buildings , Building Physics, HVAC , Building Materials , Engineering Thermodynamics, Heat and Mass Transfer , Thermodynamics , Theoretical and Applied Mechanics
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