Condensing Warm Air Generator with Subdivided Heating Air Ducts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing directly heated warm air generators for large halls lack efficiency and effective environmental protection, particularly in terms of heat utilization and air circulation, due to limitations in heat transfer mechanisms and spatial distribution of warm air.
Innovation Solution
The implementation of condensing technology in a directly heated warm air generator, where the heating air duct is subdivided to allow for heat transfer from the combustion chamber and exhaust gas, enabling the exhaust gas temperature to be lowered below condensation temperature, and using countercurrent air supply to preheat the burner air with residual heat, thereby maximizing heat utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If heat is emitted directly at or near the heating device, then the structure is easier to implement, but air circulation deteriorates
Solution Approach 1:
The heating device is segmented into distinct functional zones: a combustion chamber for heat generation, a heat exchanger for heat transfer, and separate air intake and discharge pathways. This segmentation allows the hot exhaust gas to travel through extended channels away from the heating device, enabling better air circulation while maintaining structural feasibility through modular design
2Ease of operation
If heat is emitted over a larger area remote from the heating device, then air circulation improves, but construction becomes more complex
Solution Approach 1:
The exhaust gas channel and heat exchanger are merged into a single integrated structure where the exhaust gas channels serve dual purposes: transporting hot gas away from the combustion chamber and simultaneously functioning as the heat exchanger surface. This combination reduces the number of separate components needed, simplifying construction while achieving remote heat emission over a large area
3Use of energy by moving object
If exhaust gas temperature is lowered for condensation, then heat utilization improves, but heat transfer efficiency may decrease
Solution Approach 1:
The heat exchanger is designed as an extended U-shaped channel that continuously extracts heat from the exhaust gas throughout its entire length, maintaining effective heat transfer over the continuous flow path. This continuous heat extraction ensures that even as the gas cools toward condensation temperature, heat transfer efficiency is maximized across the entire exhaust gas journey, preventing energy loss
4Use of energy by moving object
If the heating air duct is subdivided for condensing technology, then efficiency increases, but device complexity increases
Solution Approach 1:
The exhaust gas channel is designed to serve multiple functions simultaneously: it acts as the heat exchanger surface for heating air, serves as the exhaust gas transport pathway, and functions as the condensation surface for heat recovery. This multi-functionality eliminates the need for separate dedicated components for each function, reducing overall device complexity while achieving high efficiency through condensing technology
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 approach enhances the efficiency of the warm air generator by utilizing the heat of condensation and improving air circulation, resulting in a more efficient and environmentally friendly heating system with better room climate control.
Implementation Method 1
heat transfer from the combustion chamber and exhaust gas
Implementation Method 2
exhaust gas temperature to be lowered below condensation temperature, and using countercurrent air supply to preheat the burner air with residual heat
Implementation Method 3
a burner (41) arranged in the combustion chamber (40) and connected to an air supply duct (42). A mixture of air and fuel is burned in the combustion chamber (40)
Implementation Method 4
a fan or a blower (80) in an air intake device (81) for the supply of room air
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a directly heated warm air generator with a combustion chamber in which fuel can be burned to generate heat, and with at least one heat exchanger in which heat from the combustion chamber (40) and from exhaust gases generated in the combustion chamber is transferred to air intended for heating in order to generate warm heating air, wherein the heat exchanger has at least one exhaust pipe (50, 51) which has a greater extent in at least one spatial direction than the greatest extent of the combustion chamber, and at least one heating air duct (113) which extends along the combustion chamber and the exhaust pipe and guides the heating air to be heated along the combustion chamber and the exhaust pipe for heat exchange, wherein the heating air duct is subdivided in at least one partial area such that heating air sub-ducts (114, 115) are provided for guiding heating air components of different temperatures, wherein the heating air duct is designed such thatthat the portion of heated air with the lower temperature is directed so that it hits an end section of the exhaust pipe, in order to cool the exhaust gas temperature below the condensation temperature.