Laundry dryer
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Solution Overview
Problem
The positioning of heat pump components in the basement of a laundry dryer creates inefficiencies due to the need for air flow to navigate bends and curves, affecting the overall efficiency and airflow dynamics.
Innovation Solution
The layout of the laundry dryer's basement is redesigned with the heat exchangers located in the third and fourth quarters and the compressor and motor positioned in the first and second quarters, allowing for a straighter airflow path and maximizing heat exchange surface without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If heat pump components are positioned in the basement of the laundry dryer, then all necessary components can be housed in the confined space, but the air flow path becomes curved and inefficient
Solution Approach 1:
The basement is divided into four quarters by two perpendicular planes, with heat exchangers placed in the third and fourth quarters and the compressor/motor in the first and second quarters. This segmentation allows the air duct to pass straight through the basement from the drum to the heat exchangers without curves or bends, improving airflow efficiency while still housing all components in the confined basement space.
2Area of stationary object
If heat exchangers are made larger to maximize heat exchange surface, then heat exchange efficiency improves, but the confined basement space becomes insufficient for other components
Solution Approach 1:
By utilizing the lateral quarters (third and fourth) of the basement rather than occupying the central airflow path, the design allows heat exchangers with large surface areas to be installed without interfering with the straight airflow path. This dimensional arrangement in the basement quarters enables both large heat exchange surfaces and adequate space for other components.
3Productivity
If the air duct follows a straight path from the drum to the heat exchangers, then airflow efficiency is maximized, but component positioning becomes more constrained
Solution Approach 1:
The design uses asymmetric positioning of components in the basement quarters rather than symmetric central placement. The heat exchangers are positioned in the third and fourth quarters while the compressor and motor occupy the first and second quarters, creating an asymmetric layout that accommodates the straight airflow path from the drum while properly positioning all necessary components.
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 configuration improves airflow efficiency, reduces energy consumption, and noise, while allowing for larger heat exchangers and additional space for other components.
Implementation Method 1
The condenser and the evaporator are heat exchangers between the air stream circuit and the refrigerant circuit
Implementation Method 2
the air stream is cooled down and dehumidified in the evaporator
Implementation Method 3
the refrigerant is compressed by a compressor, condensed in the condenser, expanded in an expansion device and then vaporized in the evaporator
Data Source
AI summary
A laundry dryer including: a drum, a motor to rotate the drum, a casing supporting the drum and including a rear wall and a front wall, a basement having first, second, third and fourth quarters with the first and third quarters on one side of a plane perpendicular to the basement plane and parallel to the drum axis, and the second and fourth quarters on an opposite side of the plane, a process air conduit in fluid communication with the drum and including a basement process air conduit located in the basement, and a heat pump circuit including a compressor, and first and second heat exchangers. The first and second heat exchangers are in the basement process air conduit mainly within third and fourth quarters, and the motor and compressor are mainly in, respectively, in the first and second quarters.