Multi-effect solar distillation system and associated methods
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Solution Overview
Problem
Current solar-powered distillation systems for seawater and contaminated water are inefficient in terms of energy reuse and require significant heat for evaporation, making them costly and less effective for large-scale operations.
Innovation Solution
A multi-stage solar distillation system with receivers configured in series, where each receiver reuses heat energy from the previous stage, and a distillation tube extending through the receivers to condense water vapor back into liquid, increasing efficiency by utilizing the heat given off during phase change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional distillation processes are used to purify water, then impurities are effectively removed, but considerable heat energy is required to produce sufficient evaporation
Solution Approach 1:
The distillation system is divided into multiple effects or stages, where each stage performs partial evaporation and condensation. The condensate from one stage serves as feed for the next stage, segmenting the overall purification process into manageable steps that progressively remove impurities while reusing energy at each segment.
Solution Approach 2:
The system maintains continuous operation by recycling the condensate from each effect back into the feed stream for the next effect. This continuous circulation ensures that the useful action of heat transfer and phase change persists without interruption, maximizing energy utilization and maintaining steady-state purification.
2Loss of energy
If solar energy is used to power distillation systems, then operational costs are reduced, but the systems require large surface areas and significant space for effective evaporation
Solution Approach 1:
Instead of using large flat solar collectors, the system employs parabolic troughs that concentrate solar energy into a focused line or point. This local concentration of solar energy at the receiver tube creates high thermal flux in a small area, enabling efficient evaporation without requiring large collector surfaces.
Solution Approach 2:
The system uses selective coating materials on the receiver tubes that have high solar absorptivity and low thermal emissivity. These composite material properties allow the receiver to absorb maximum solar energy while minimizing heat loss, thereby reducing the required collector area for a given evaporation rate.
3Reliability
If heat is applied to boil water for evaporation, then purification is achieved, but the process becomes costly and less effective for large-scale operations
Solution Approach 1:
Multiple effects are combined into a single integrated system where the condenser of one effect serves as the evaporator for the next effect. This merging of functions allows the system to achieve large-scale purification by cascading multiple stages, where each stage contributes to the overall productivity while maintaining high purification quality through cumulative impurity removal.
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 approach enhances the efficiency of the solar distillation process by reusing energy across stages, reducing the need for excessive heat and lowering operational costs, while effectively purifying water from seawater or contaminated sources.
Implementation Method 1
A plurality of solar panels configured to reflect sunlight
Implementation Method 2
Water vapor is generated as the process water is heated within each receiver
Implementation Method 3
As the water vapor travels through the distillation tube the water vapor changes to a liquid
Implementation Method 4
each receiver uses heat energy from a previous receiver to heat the process water
Data Source
Figure 1
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AI summary
A solar distillation system includes solar panels, and receivers adjacent the solar panels to receive process water to be processed to purified process water. The process water flows from a first receiver to a last receiver and is heated by reflected sunlight. Vapor tubes are coupled to the receivers, with each respective vapor tube coupled between adjacent receivers. Water vapor is generated as the process water is heated within each receiver. The water vapor flows via the respective vapor tubes between the adjacent receivers towards the last receiver. A return vapor tube is coupled to the last receiver. A distillation tube is coupled to the return vapor tube to receive the water vapor. The distillation tube extends through the receivers from the last receiver to the first receiver. As the water vapor travels through the distillation tube it changes to a liquid, with the liquid being the purified process water.