Meat Smoker Plenum Box Design for Uniform Temperature Distribution
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Solution Overview
Problem
Conventional smokers suffer from non-uniform temperature distribution and inefficient heat transfer in the smoking chamber, leading to suboptimal 'smoker ring' and 'Bark' effects, requiring frequent operator intervention and increased fuel consumption.
Innovation Solution
The smoker design incorporates a 'plenum box' with smaller openings and deflector openings that generate vortices, increasing gas velocity and promoting uniform temperature and enhanced heat transfer by maintaining static pressure and directing hot gases obliquely into the smoking chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional smokers use large openings in the dividing plate, then heat transfer area is increased, but temperature distribution becomes non-uniform
Solution Approach 1:
The single large opening is segmented into multiple smaller openings (5, 5-8) distributed across the dividing plate. This segmentation allows the system to maintain adequate heat transfer area while distributing hot gas flow more uniformly across the smoking chamber, preventing localized overheating and achieving more uniform temperature distribution.
Solution Approach 2:
The dividing plate is designed with non-uniform opening distribution, where openings are strategically positioned and sized to account for natural convection patterns. This local quality adjustment ensures that areas receiving more natural hot gas flow have fewer or smaller openings, while areas needing more heat have larger or more openings, achieving balanced uniform temperature distribution.
2Productivity
If conventional smokers use simple duct design, then device complexity is reduced, but heat transfer efficiency decreases
Solution Approach 1:
The lower chamber acts as an intermediary plenum box between the furnace and smoking chamber. It receives hot gases from the furnace, allows pressure equalization and flow distribution, then delivers gases through multiple controlled openings to the smoking chamber. This intermediary structure significantly improves heat transfer efficiency by ensuring uniform gas distribution, while adding only moderate structural complexity.
3Temperature
If conventional smokers lack pressure equalization, then device complexity is reduced, but temperature uniformity deteriorates
Solution Approach 1:
The lower chamber serves as a preliminary pressure equalization plenum before gases enter the smoking chamber. By allowing gases to accumulate and equalize pressure in the lower chamber first, the system ensures uniform pressure distribution at the openings, which directly translates to uniform temperature distribution in the smoking chamber. This preliminary action adds simple volumetric structure rather than complex active control mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves uniform temperature distribution and improved heat transfer efficiency, resulting in better quality smoked food with reduced smoking time and fuel consumption, while being easier to operate and maintain.
Implementation Method 1
The lower chamber 3, which transforms it in a 'plenum box' with characteristics to keep the inside static pressure of the gases homogeneous
Implementation Method 2
The present invention provides the openings that communicate this plenum box with the smoking chamber are designed and dimensioned in order to provide greater velocity in the gases that enter the smoking chamber
Implementation Method 3
said openings, therefore, have significantly smaller dimensions compared to the equivalent openings of the usual horizontal 'Off Set' direct flow smokers. The present invention also provides for the fact that said openings, communicating the plenum box with the smoking chamber, are openings that is equipped with deflectors directing the flows of heated gases provided with a suitable arrangement and shape to generate vortices of hot gases with high velocities into the smoking chamber
Implementation Method 4
The results of these vortices and high velocity hot gases are to uniformize the temperature inside the smoking chamber and optimize the process of heat transmission between the gases and the food
Data Source
AI summary
A smoker for meats and other foods, belonging to the technical sector of barbecues and similar, of horizontal type, with displaced furnace and direct flow or vertical type smokers, is formed: by a smoking chamber and a furnace. The smoking chamber is formed by: a dividing plate; a lower chamber arranged in communication with the furnace; a smoking chamber itself; passages provided in the dividing plate through which the heated gases are fed into the smoking chamber itself; a set of grates disposed in different levels; and a chimney; the lower chamber is constituted by a plenum box, which maintains the static pressure of the heated gases homogeneous in its interior; the passages include alignments of deflector openings provided on the opposite sides of the dividing plate, selected to increase the speed with the formation of vortices and direct the heated gas fed into the smoking chamber itself.