Heat Pump Dryer Airflow Split for Dehumidification Efficiency
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Solution Overview
Problem
Conventional heat pump drying assemblies suffer from low heat exchange efficiency due to the need for air dehumidification, which reduces the air flow rate and results in unsatisfactory heat extraction, making them energy inefficient and environmentally impactful.
Innovation Solution
A heat pump dryer design featuring a main casing with partitioning and outlet dividers to create separate air streams with different temperatures and humidity levels, utilizing multiple heat exchangers and fans to optimize heat exchange efficiency by bifurcating air flow and using a compressor and outdoor cooling unit to manage refrigerant flow and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If air is dehumidified after passing through the evaporator, then humidity control is achieved, but heat exchange efficiency deteriorates due to reduced air flow rate
Solution Approach 1:
The patent divides the air handling system into two separate channels: a first channel that dehumidifies air through the evaporator, and a second channel that maintains high heat exchange efficiency without dehumidification. This segmentation allows each channel to be optimized for its specific function, resolving the contradiction between humidity control and heat exchange efficiency
Solution Approach 2:
Different quality air streams are produced for different purposes: one stream is dehumidified for items requiring low humidity, while another stream maintains high temperature and humidity for items requiring efficient heat exchange. This local quality differentiation allows simultaneous satisfaction of diverse drying requirements without compromising overall system efficiency
2Loss of energy
If conventional heat exchangers are used, then heat exchange occurs, but energy efficiency deteriorates due to the need for air dehumidification
Solution Approach 1:
The drying system is segmented into multiple independent air channels, each capable of delivering air with different temperature and humidity characteristics. This allows the system to provide energy-efficient high-temperature drying for suitable items while still offering dehumidified drying when required, thereby improving overall energy efficiency without sacrificing drying quality control
Solution Approach 2:
The system dynamically switches between different operating modes by directing air through different channels based on the drying requirements. Users can select between dehumidified mode and high-efficiency heat exchange mode, allowing the system to adapt to different item types and optimize energy consumption accordingly
3Adaptability or versatility
If single outlet design is used, then device complexity is reduced, but adaptability deteriorates due to inability to provide different drying conditions
Solution Approach 1:
The air outlet is segmented into multiple independent outlets, each connected to different air channels with distinct temperature and humidity characteristics. This segmentation enables the system to provide diverse drying conditions simultaneously, greatly enhancing adaptability to different item types while maintaining a relatively simple overall structure
Solution Approach 2:
The multi-channel air outlet system provides universal functionality by accommodating various drying requirements through a single integrated device. Different channels can serve different item types with different drying needs, making the dryer universally applicable to diverse items without requiring multiple separate devices
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 enhances heat exchange efficiency by allowing for adjustable air flow and humidity, enabling effective drying of various items with different requirements while reducing energy consumption and environmental impact.
Implementation Method 1
a compressor; wherein a predetermined amount of refrigerant is arranged to leave the compressor and enter the first heat exchanger
Implementation Method 2
a first heat exchanger provided in the heat exchanging compartment of the main casing and connected to the compressor through at least one of the connecting pipes, the first heat exchanger having a first portion exposed to the first outlet conduit, and a second portion exposed to the second outlet conduit; wherein a predetermined amount of refrigerant is arranged to leave the compressor and enter the first heat exchanger for releasing heat to the air passing therethrough
Implementation Method 3
a second heat exchanger connected to the compressor and the first heat exchanger through at least one of the connecting pipes, the second heat exchanger being positioned in the first outlet conduit adjacent to the first portion of the first heat exchanger and between the first heat exchanger and the air passage; wherein the refrigerant leaving the first heat exchanger being arranged to enter the second heat exchanger for absorbing a predetermined amount of heat from the air passing therethrough so as to remove a predetermined amount of water from the air passing through the second heat exchanger
Implementation Method 4
a first fan and a second fan provided in the first outlet conduit and the second outlet conduit respectively
Data Source
AI summary
A heat pump dryer includes a main casing, a compressor, a first heat exchanger having a first portion and a second portion, and a second heat exchanger. The main casing has an air inlet, a first outlet conduit, a second outlet conduit, a first air outlet, and a second air outlet. Air is arranged to enter the main casing through the air inlet, and is arranged to be bifurcated to pass through the first outlet conduit and the second outlet conduit. The air in the first outlet conduit is arranged to sequentially flow through the second heat exchanger and the first portion of the first heat exchanger, whereas the air in the second outlet conduit is arranged to flow through the second portion of the second heat exchanger.