Wood heating device
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Solution Overview
Problem
Current wood heating devices, such as decorative fireplaces with suspended hearths, face inefficiencies in preheating oxidant air before it enters the combustion chamber, which affects combustion efficiency and increases harmful particle discharges.
Innovation Solution
A wood heating device design featuring a metal combustion space with a retractable intake and preheated oxidant air ducts that store and circulate preheated air around the combustion chamber, ensuring efficient delivery of preheated oxidant air through extended paths, reducing temperature variability and increasing combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxidant air is supplied directly to the combustion chamber without preheating, then the device structure is simple, but combustion efficiency is reduced and harmful particle discharges increase
Solution Approach 1:
The patent applies preliminary action by preheating the oxidant air in a heat exchanger before it enters the combustion chamber. The air is heated in advance by hot flue gases through a heat exchanger system, and then this preheated air is supplied to the combustion chamber to improve combustion efficiency and reduce harmful emissions.
2Productivity
If a heat exchanger with extended air paths is used to preheat oxidant air, then combustion efficiency improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The outer casing serves multiple functions: it provides structural support, acts as a heat exchanger for preheating air, and serves as the housing for the combustion chamber. This multi-functionality eliminates the need for separate heat exchanger components, simplifying the overall structure and easing manufacturing while maintaining effective air preheating.
3Productivity
If oxidant air ducts are positioned close to the combustion chamber, then the device structure is compact, but temperature variability increases and combustion efficiency decreases
Solution Approach 1:
The oxidant air undergoes preliminary heating in the heat exchanger before reaching the combustion chamber. This preheating action stabilizes the air temperature entering the combustion chamber, reducing temperature variability and improving combustion efficiency regardless of the duct positioning.
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
The solution enhances combustion efficiency by rapidly raising interior temperatures, reduces harmful particle discharges, and improves environmental performance by stabilizing temperature rises with varying outside air flow rates.
Implementation Method 1
a channel integrating a heat exchanger wherein air ducts extend. The bed of embers is consumed on the andiron, and the air circulates by natural convection within the ducts and is heated by transfer of heat energy from the bed of embers to the ducts
Implementation Method 2
the air circulates by natural convection within the ducts and is heated by transfer of heat energy from the bed of embers to the ducts
Implementation Method 3
a combustion chamber delimited by a metal combustion space
Data Source
AI summary
The wood heating device, such as a stove or a wood-burner, includes a combustion chamber defined by a metal combustion space having an intake. The chamber is equipped with a closing mechanism of the retractable type, and at least one distinct oxidant air inlet orifice. The combustion space is housed in a metal outer casing. The outer casing defines with the combustion space at least one reserve of preheated air and an oxidant air duct. An outside-air supply opening is made in the outer casing and is arranged laterally to the intake. The reserve of preheated air bypasses the combustion space by at least one side starting from the outside-air supply opening.