Abstract
To reduce energy consumption and protect the environment, a type of hollow shale block with 29 rows of holes was designed and produced. This paper investigated the thermal properties of hollow shale blocks and walls. First, the guarding heat-box method was used to obtain the heat transfer coefficient of the hollow shale block walls. The experimental heat transfer coefficient is 0.726 W/m2·K, which would save energy compared to traditional wall materials. Then, the theoretical value of the heat transfer coefficient was calculated to be 0.546 W/m2·K. Furthermore, the one-dimensional steady heat conduction process for the block and walls was simulated using the finite element analysis software ANSYS. The predicted heat transfer coefficient for the walls was 0.671 W/m2·K, which was in good agreement with the test results. With the outstanding self-insulation properties, this type of hollow shale block could be used as a wall material without any additional insulation measures in masonry structures.
Highlights
Worldwide, economic development has been increasingly restricted by a shortage of natural resources [1]
The results indicate that the heat transfer coefficient of hollow shale block walls is 0.726 W/(m2⋅K), which meets the Hollow shale block Clay brick Concrete block Recycled concrete blocks
The following conclusions can be drawn from this research: (i) The experimental heat transfer coefficient of hollow shale block walls is 0.726 W/m2⋅K, which meets the design codes and shows their remarkable selfinsulation characteristics compared with other wall materials
Summary
Economic development has been increasingly restricted by a shortage of natural resources [1]. Economic growth results in problems such as destruction of the environment and resource waste. To improve this situation and to promote building energy efficiency, the traditional solid clay bricks have been officially forbidden in building construction, promoting the study and application of new wall materials [2]. There are many types of new wall materials, such as small concrete hollow block, aerated concrete block, and small hollow fly ash block. None of these wall materials are self-insulating, and certain external wall thermal insulation measures are required. In traditional brick masonry, the thickness of mortar joints varies from 8 mm to 12 mm, forming obvious thermal bridges and resulting in significant energy loss
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