Square pitch is used in HEX and condensers when a fluid that is prone to fouling is flowing through the shell side. Square pitch allows for easier cleaning but the heat transfer isn't as high as triangular pitch because less tubes can be placed. If you don't have a fluid that is prone to fouling (adding layers of junk to the tubes) you can use triangular which allows you to place more tubes in the HEX so higher heat transfer.
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The base of a triangular prism is a triangle and the base of a square pyramid is a square.
Pyramids only have square bases.Triangular prisms have triangle bases.Pyramids have triangle "faces".Triangular prisms have rectangular "faces".
None, because there can be no such thing as a triangular square. If it is triangular it cannot be a square, if it is a square it cannot be triangular.
No. You will have smaller square or triangular gaps between them.
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