Abstract
After the first concerns about global energy consumption around the 70 s, some standards were established with the aim of improving the energy efficiency in buildings. In this context, according to the US Department of Energy, heating, ventilation, and air conditioning (HVAC) systems comprise about 50% of the building energy consumption and 20% of total consumption in the United States. Energy consumption of this kind of equipment depends on several factors, one of the most important factors being the heat transfer through the building envelope. In the walls, hollow concrete blocks have become common in recent years due to advantages such as their strength, their space for pipes and wiring, and fast construction, among others. In order to reduce the thermal load, several forms of insulation were tested on these constructive elements. Thus, effects of the low emissivity, insulating material, radiant shields, and baffles on the inner cavities of the blocks are presented in this paper. Effects of temperature differences between the exterior surfaces on the thermal transmittance and on the combined average heat transfer coefficient inside the cavities are also shown.
Highlights
Building energy consumption usually takes a significant percentage of the total energy consumption
Hollow concrete blocks have become common in recent years due to advantages such as strength, fast construction, space for pipes and wiring, and the small amount of waste produced during the construction process
An improvement on the performance of the standard block was observed with the application of the low emissivity coating in the cavities surfaces in case #2, reducing the cavity heat transfer coefficient and reducing the thermal transmittance
Summary
Building energy consumption usually takes a significant percentage of the total energy consumption. According to BEN 2018 (The Brazilian Energy Balance) [1], energy consumption in residential, commercial, and public sectors represents 15.4% of the final consumption in Brazil. In the United States, heating, ventilation, and air conditioning (HVAC) systems for buildings comprise about. 50% of the building energy consumption and 20% of total consumption In this context, the heat transfer through the building envelope is one factor that influences the HVAC energy consumption in a crucial way. The overall performance of the building envelope depends on many factors, such as the thermophysical properties of all materials used in the wall, thickness and material assembly, the adoption of air-gap and its ventilation level, among others. Hollow concrete blocks have become common in recent years due to advantages such as strength, fast construction, space for pipes and wiring, and the small amount of waste produced during the construction process
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