Heating device for tumble dryer and tumble dryer
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Solution Overview
Problem
Existing heating devices for tumble dryers suffer from significant energy loss due to heat transfer through the outer housing, posing risks of burns and potential damage to components.
Innovation Solution
A heating device with a housing that includes a heat shield and a bypass airflow system, where a smaller portion of the airflow is not heated and used to cool the housing, reducing heat loss and protecting users and components from excessive heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat shield is inserted between the heating arrangement and the housing, then the temperature of the housing is reduced, but heat loss through the housing still occurs
Solution Approach 1:
The airflow is segmented into two separate paths: a main airflow that passes through the heating arrangement to be heated, and a bypass airflow that flows around the heating arrangement through apertures in the heat shield. This segmentation allows the bypass airflow to cool the housing while the main airflow provides heating function.
Solution Approach 2:
The bypass airflow acts as an intermediary thermal medium that absorbs excess heat from the housing outer wall without interfering with the main heating function. This intermediary flow transfers heat away from the housing, reducing both housing temperature and heat loss to the environment.
2Object-affected harmful factors
If the housing temperature is reduced to prevent burns and damage, then safety is improved, but the heating efficiency may be compromised
Solution Approach 1:
Different regions of the airflow are given different thermal characteristics: the main airflow is heated to high temperatures for effective drying, while the bypass airflow remains cooler to protect the housing and components. This local differentiation of thermal quality allows simultaneous achievement of heating efficiency and safety.
Solution Approach 2:
The total airflow is divided into functional segments with different temperature requirements. The main airflow segment handles the heating task, while the bypass airflow segment handles the cooling/protection task, allowing the system to optimize both heating efficiency and safety independently.
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 effectively reduces heat loss through the rear wall, enhances safety by lowering the thermal load on temperature sensors, and improves the efficiency of the heating device while preventing burns and damage to power cables or plastic tubes.
Implementation Method 1
The bypass airflow or air bleed cools the housing so that the risk of burns for users is definitely reduced
Implementation Method 2
The bypass airflow or air bleed acts as a thermal insulator reducing heat loss through the rear wall and improving the efficiency of the heating device
Implementation Method 3
Inside the housing of the heating device a heating arrangement which may be formed by plural heating coils is accommodated
Implementation Method 4
A main airflow to be heated is guided through the heating arrangement
Data Source
AI summary
A heating device for a rear wall of a tumble dryer is disclosed, wherein the heating device includes an electric heating arrangement which may be formed of heating coils. A bypass airflow which is not directly heated by the heating arrangement flows in addition in the housing so that the heat loss through the housing is reduced.