Dryer for drying dry materials, especially textiles
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Solution Overview
Problem
Existing drying technologies for textiles and dry materials are energy-inefficient and require high energy input, leading to longer drying times and increased operational costs.
Innovation Solution
A dryer system comprising a heating chamber, a cooling chamber, a steam generator, a heat pump, and a vacuum pump, where steam is used to evaporate moisture in the heating chamber, and the resulting moist steam is condensed in the cooling chamber, creating a pressure difference that enhances the drying process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a vacuum pump is used to pump out moist air during the entire drying process, then the drying process can be maintained, but the energy input increases significantly
Solution Approach 1:
The drying system is divided into two separate chambers: a heating chamber for evaporation and a cooling chamber for condensation. This segmentation allows different pressure conditions to be maintained in each chamber, enabling the vacuum pump to operate only in the cooling chamber rather than continuously in the entire drying system, thereby reducing energy consumption.
Solution Approach 2:
The vacuum pump operates periodically rather than continuously - it is activated when the pressure in the cooling chamber increases due to condensation, and deactivated when the pressure stabilizes. This periodic operation maintains drying effectiveness while significantly reducing the overall energy input compared to continuous vacuum pumping.
2Device complexity
If both evaporation and condensation take place in the same vacuum container, then the process is simplified, but the dry materials must be protected from condensate contact and a larger cooling reservoir is required
Solution Approach 1:
The system separates evaporation and condensation into two distinct chambers - the heating chamber for evaporation and the cooling chamber for condensation. This spatial segmentation prevents condensate from contacting dry materials while allowing a more compact cooling reservoir design, as the cooling chamber only needs to handle condensation volume rather than total process volume.
Solution Approach 2:
A connecting line with a closing valve serves as an intermediary between the heating and cooling chambers. This allows controlled fluid communication between chambers while maintaining their functional independence, enabling the cooling chamber to be smaller since it only needs to accommodate condensation rather than the entire process.
3Reliability
If the pressure in the cooling chamber is lowered continuously with a vacuum pump, then condensation is maintained, but the energy input remains high
Solution Approach 1:
The cooling chamber utilizes the heat pump to create and maintain the low temperature condition necessary for condensation. The heat pump actively cools the chamber, creating a temperature gradient that drives condensation without requiring continuous vacuum pumping. The system serves itself by using thermal energy management to maintain the pressure and temperature conditions needed for reliable condensation.
Solution Approach 2:
The system changes the primary control parameter from continuous pressure reduction via vacuum pump to temperature control via heat pump. By maintaining a low temperature in the cooling chamber, condensation is achieved through the temperature-dependent saturation pressure relationship, eliminating the need for continuous high-energy vacuum operation while maintaining reliable condensation.
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 system achieves efficient and gentle drying of materials by utilizing steam as an energy carrier and pressure differences between chambers, resulting in reduced energy consumption and shorter drying times.
Implementation Method 1
the steam supplied by the steam generator removes moisture from the dry materials in the heating chamber, thus drying the dry materials
Implementation Method 2
the steam condenses out on the evaporator of the heat pump
Implementation Method 3
a heat pump that can be actively connected to both chambers, wherein the heat pump comprises a condenser and an evaporator
Implementation Method 4
a vacuum pump that can be actively connected to at least one of the two chambers
Implementation Method 5
creating a pressure difference that enhances the drying process
Data Source
AI summary
A dryer for drying dry materials havingheating and cooling chambers, wherein the two chambers are sealed gas-tight to each other and/or to the outside environment,a connecting line that fluidically connects the chambers to each other and has a closing valve,a vacuum pump that is actively connected to the cooling chamber,a heat pump that is actively connected to the two chambers,and a steam generator which feeds generated steam via a steam line into the heating chamber,The steam mixes with moisture of the dry materials in the heating chamber and the resulting moist steam is supplied to the cooling chamber via the connecting line, wherein positive pressure is generated through evaporation and negative pressure is produced through the condensation such that a pressure difference is produced between the heating and cooling chambers, and wherein the vacuum pump pumps dry air from the cooling chamber as required.