Converter-Free Solar Desalination
Official patent title
Converter-free PV-powered water desalination system for remote communities
Arabic title: نظام لتحلية المياه يعمل بالطاقة الكهروضوئية (PV) من دون محول للمجتمعات النائية
Invention
Invention
Problem
Off-grid desalination systems often depend on power converters, batteries, or diesel generation. These components increase cost, maintenance, control complexity, and failure risk for remote communities.
Why it matters
A simpler solar-driven system could improve access to fresh water in isolated coastal or arid locations while reducing dependence on fuel delivery and specialized power electronics.
Approach
The system connects a PV panel directly to switchable resistive heaters and reconfigures their series, parallel, or disconnected states so the electrical resistance tracks the panel's maximum-power-point resistance as sunlight changes.
Who may benefit
Potential beneficiaries include remote communities, humanitarian water programs, off-grid infrastructure developers, solar-desalination companies, municipalities, and operators of isolated coastal facilities.
Potential value
The architecture seeks maximum-power operation without a DC-DC converter by matching the load itself, while optional Fresnel lenses, a pump, battery routing after boiling, and vapor condensation support a thermal desalination workflow.
Background
Background
Remote desalination is constrained by limited grid access, fuel logistics, and maintenance capacity. Photovoltaic systems can supply renewable electricity, but conventional maximum-power-point tracking normally uses electronic converters that add cost and possible failure points. Directly coupling a PV panel to a fixed heater wastes available power when irradiance changes because the electrical operating point shifts. The disclosed approach changes the heater network resistance in discrete steps, aiming to keep the panel near its maximum-power condition while heating and boiling saline water.
Technology overview
Technology overview
A light sensor measures solar irradiance and a controller selects among stored switch configurations for four immersed heaters and nine switches, choosing the total resistance closest to the PV panel's instantaneous RMppt. The panel supplies direct current without a power converter. A temperature sensor identifies boiling; an optional battery receives surplus power afterward. Fresnel lenses add solar heat, a PV-powered pump feeds saline water, and a condenser converts generated vapor to fresh water. Another embodiment uses one heater, motor, battery, and six switches.
Potential applications
Potential applications
- Off-grid thermal desalination.
- Solar water heating in remote facilities.
- Emergency and humanitarian fresh-water systems.
- Converter-free PV load-matching research.
- Small coastal-community water supply.
Evidence-supported advantages
Evidence-supported advantages
- Eliminates the claimed need for an intermediate power converter.
- Adapts heater resistance to changing irradiance.
- Uses direct resistive heating with simple switching states.
- Can combine PV electricity with focused solar heat.
- Includes optional pumping, storage, and condensation functions.
Development stage
Development stage
A system architecture, switching network, control logic, and desalination process are described; measured prototype efficiency, fresh-water yield, water quality, and long-duration field reliability were not established. The development stage was not independently verified.
Commercial opportunity
Commercial opportunity
The design may interest modular desalination and off-grid solar suppliers. Commercial validation needs a field prototype, hourly and seasonal fresh-water yield, energy and exergy balances, water-quality testing, heater scaling and corrosion studies, switch reliability, dry-run protection, thermal safety, lifecycle cost, maintenance analysis, and comparison with converter-based and passive solar alternatives.
Patent classifications
Patent classifications
WIPO IPC
- C02F1/14Treatment of water, wastewater, sewage or sludge
- B01D1/00Separation
CPC
- B01D1/0035Separation
- B01D1/0082Separation
- B01D5/006Separation
- C02F1/008Treatment of water, wastewater, sewage or sludge
- C02F1/048Treatment of water, wastewater, sewage or sludge
- C02F1/14Treatment of water, wastewater, sewage or sludge
- F24S10/17Solar heat collectors; solar heat systems
- F24S23/31Solar heat collectors; solar heat systems
- H02J3/32Electric power networks; circuit arrangements or systems for supplying or distributing electric power; electric-energy storage systems
- H02J3/38Electric power networks; circuit arrangements or systems for supplying or distributing electric power; electric-energy storage systems
- H05B1/0244Electric heating; electric light sources not otherwise provided for; circuit arrangements for electric light sources
- C02F2103/08Treatment of water, wastewater, sewage or sludge
- C02F2201/009Treatment of water, wastewater, sewage or sludge
- C02F2209/02Treatment of water, wastewater, sewage or sludge
- H02J2101/25Electric power networks; circuit arrangements or systems for supplying or distributing electric power; electric-energy storage systems
- H02S99/00Generation of electric power by converting infrared radiation, visible light or ultraviolet light, e.g. using photovoltaic [PV] modules
Inventors
Inventors
- First inventorMohamed Yehia Mohamed Shalaby
Keywords
Keywords
- solar desalination
- photovoltaic
- converter-free
- maximum power point
- resistive heating
- load matching
- remote communities
- fresh water
Patent document and drawings
Patent document and drawings
The patent publication is mapped to this record. Patent drawings remain within that publication; no separately cleared public media package has been supplied.