Brewer needs lesson in thermodynamics.

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A brewery startup is seeking guidance on designing an efficient brew kettle, specifically regarding the layout of the firebox for optimal heating. The kettle dimensions are 45" wide and 48" tall, with plans to use a 400k BTU forced air burner. The discussion highlights the need for baffles to improve gas flow between the burner and exhaust for better heating efficiency. A sketch of the kettle is included for reference, but the original poster is looking for specific advice on gas flow patterns. The forum aims to gather insights to enhance the brewing process effectively.
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I'm starting a brewery and need some help designing a brew kettle. I haven't found much in the brewing community about how a brew kettles firebox is laid out. I've got a tank that is 45" wide and 48" tall and I'm planning on heating it with a 400k btu forced air burner, basically like a small jet engine. But in order to heat efficiently I'm thinking it needs some baffles between where the gas is blown in and the exhaust. I'll include a sketch of the kettle, but i need help laying out the best possible gas flow pattern for efficiently heating the thing, please help me. Here's a good forum post on it, but doesn't help me much. http://discussions.probrewer.com/showthread.php?18370-Brew-Kettle
 

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The fire box is the area under the kettle sorry it's not labeled very well in the sketch.
 

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