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Dec 07,2022
How to install a negative-pressure fan to achieve a good ventilation effect
When installing a negative-pressure fan, it is crucial to ensure high-quality installation, paying particular attention to eliminating any gaps around the fan. During the installation of a negative-pressure fan, it is best to close all surrounding doors and windows; however, doors and windows on the opposite wall should be left open to allow for air circulation. The proper installation of negative-pressure fans is extremely important and directly affects their subsequent performance.
Dec 07,2022
Precautions when installing and using a negative-pressure fan:
It is preferable to install a negative-pressure fan in the middle of the building's interior space, close to areas where high temperatures, stuffy heat, as well as concentrated smoke and odors are generated. If possible, install it at the upper part of the prevailing wind direction in the cooling environment. The fan can be mounted on interior walls, windows, roofs, and internal load-bearing columns. However, it is important to note that the installation conditions must ensure unobstructed intake of fresh air; in particular, the fan must not be installed in exhaust areas from which odors or harmful gases are discharged. If there are insufficient doors or windows, it is necessary to install a dedicated air supply system, with the volume of supplied air exceeding the total volume of air drawn in by the negative-pressure fan by 100–150%.
Dec 07,2022
The wood drying process involves three distinct stages:
The first stage involves removing water from the surface of the wood; this can be accomplished by drainage or other external mechanical forces (centrifugal force, pressure). However, this method allows only the removal of free water from porous wood. Another mechanism is evaporation, in which free water is present within the wood cells in a manner similar to capillary systems.
Dec 07,2022
Agricultural rice dryers employ several drying methods.
The operating principle of agricultural dryers is similar; however, the drying process itself may vary, primarily because the moisture content of rice harvested in different regions and at different times can fluctuate. The appropriate drying process should be selected based on the condition of the grain. There are four main drying processes for agricultural dryers, namely:
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