Condensation Sloped bundles

Sloped Bundles For bundles with slight slopes, the following correction should be applied to the condensing heat transfer coefficient ... 

Air cooled heat exchangers are used to transfer heat from a process fluid to ambient air. The process fluid is contained within heat eonducting tubes. Atmospherie air, whieh serves as the eoolant, is caused to flow perpendicularly across the tubes in order to remove heat. In a typical air cooled heat exchanger, the ambient air is either forced or induced by a fan or fans to flow vertically across a horizontal section of tubes. For condensing applications, the bundle may be sloped or vertical. Similarly, for relatively small air cooled heat exchangers, the air flow may be horizontal across vertical tube bundles. 

Ail cooler for single pass condensing service is requited to slop the tube bundle at 1/8 inch/foot to let condensate moving to downstream header box. For multiple pass condensing service or single phase servicci, sloping IS not required. 

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