Closed-Cycle Dryer Bypass Layout for Efficient Moisture Condensation
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Solution Overview
Problem
Closed cycle dryers face inefficiencies in condensation processes, leading to increased energy consumption and complexity, despite efforts to improve drying efficiency.
Innovation Solution
A by-pass conduit is introduced to directly link the outlet of the condensing unit and the drum upstream of the blower, allowing saturated air to mix with hot air from the drum, reducing the energy needed for condensation and enhancing air flow through the condensing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a refrigeration cycle is used with evaporator as condenser and condenser as heating unit, then condensation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent extracts the condensation function from a complex refrigeration cycle system and implements it using a simpler heat exchanger-based condensing unit within the existing dryer heat pump system, thereby maintaining condensation efficiency while reducing device complexity
Solution Approach 2:
The heat pump system serves multiple functions: heating air in the drum, condensing moisture from the air, and providing controlled air circulation. The by-pass conduit adds another function by enabling direct mixing of saturated and hot air to optimize condensation conditions without requiring additional complex components
2Loss of energy
If water nozzles are added to cool air and remove fluff, then condensation efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes the need for water nozzles and fluff removal mechanisms by using a properly designed heat exchanger condensing unit with by-pass conduit that achieves effective condensation through optimized air mixing and heat exchange, simplifying the device while maintaining efficiency
3Use of energy by moving object
If by-pass conduit is introduced to mix saturated air with hot air, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the air flow path by introducing a by-pass conduit that creates a separate mixing zone where saturated air from the condensing unit outlet mixes with hot air from the drum outlet upstream of the blower. This segmentation allows independent control and optimization of different air streams, reducing energy consumption while adding minimal structural complexity
Solution Approach 2:
The by-pass conduit acts as an intermediary element that facilitates the mixing of two air streams (saturated air and hot air) at an optimal location in the system. This intermediary structure enables energy optimization through improved air mixing without requiring complex control systems or additional energy-intensive 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 reduces energy consumption by optimizing condensation efficiency, increasing air flow, and improving heat transfer, resulting in significant energy savings and enhanced drying performance.
Implementation Method 1
a condensing unit placed upstream the heating unit for removing moisture
Implementation Method 2
the cooling power of the condensing unit is used more efficiently for the condensation (latent heat/phase change) itself
Implementation Method 3
a heating unit used to heat air that is blown into the drum
Implementation Method 4
an air blowing unit whereby the air is conveyed to the drum
Data Source
AI summary
A closed cycle dryer comprises a drum, an air blowing unit wherein the air is conveyed to the drum, a heating unit used to heat the air that is blown into the drum, and a condensing unit upstream the heating unit for removing moisture. The dryer further comprises a by-pass between a first portion of the air circuit downstream the condensing unit and a second portion downstream the drum in order to increase the energy efficiency of the drying process.