Solar Heat Collector Piston Actuator for Self-Cleaning PV Modules
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Solution Overview
Problem
Solar photovoltaic (PV) module efficiency is reduced due to dust accumulation, which is exacerbated by environmental factors like humidity and wind, and existing cleaning methods require human intervention or artificial signals, increasing operational costs and complexity.
Innovation Solution
A solar-driven thermomechanical actuator using shape memory alloys that harnesses solar radiation to create mechanical energy for self-driven cleaning, comprising a piston, solar heat collector, springs, pulley system, and bias load, which contracts during the day to remove dust and expands at night, eliminating the need for external power or human intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If active cleaning methods are used to remove dust accumulation, then cleaning effectiveness is improved, but operational cost and system complexity increase due to human intervention and artificial power sources
Solution Approach 1:
The cleaning system utilizes the PV module's own generated electricity to power the heating element, creating a self-service mechanism where the system cleans itself without external intervention. The PV module generates power during sunlight hours, which is then used to heat the cleaning fluid, enabling autonomous operation that reduces both operational costs and system complexity.
Solution Approach 2:
The invention replaces manual mechanical cleaning operations with a thermally-driven fluid cleaning system. Instead of using mechanical brushes or human labor, the system uses heated fluid to dissolve and remove dust accumulation, substituting a complex mechanical cleaning mechanism with a simpler thermal processing approach.
2Power
If conventional heating elements are used in humid environments, then heating efficiency is improved, but reliability deteriorates due to oxidation and corrosion
Solution Approach 1:
The heating element is constructed as a composite structure with a nickel-chromium alloy coating applied over a nickel substrate. This composite material configuration provides both the required heating efficiency and enhanced resistance to oxidation and corrosion in humid environments, solving the reliability problem while maintaining power output.
Solution Approach 2:
The invention changes the chemical composition parameters of the heating element by using a nickel-chromium alloy instead of conventional heating materials. This parameter change in material composition fundamentally alters the element's resistance to environmental degradation, enabling it to withstand humid conditions without significant oxidation or corrosion while maintaining heating efficiency.
3Productivity
If cleaning frequency is increased to maintain PV efficiency, then energy output is improved, but water consumption and operational costs increase
Solution Approach 1:
The invention changes the physical state parameter of the cleaning fluid by using a heated gel formulation instead of conventional liquid cleaners. This parameter change allows the cleaning agent to remain effective at lower application rates and reduces water consumption while maintaining cleaning effectiveness. The gel structure enables better adhesion to the PV surface and reduces runoff, thereby conserving water resources.
Solution Approach 2:
The cleaning system utilizes phase transition by heating the cleaning fluid to alter its physical properties and enhance cleaning effectiveness. The thermal energy causes phase changes in the gel structure and solvent composition, improving penetration and dissolution capabilities of dust particles. This allows for less frequent cleaning cycles while maintaining PV efficiency, thereby reducing overall water consumption.
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 thermomechanical actuator effectively reduces dust accumulation on PV modules by utilizing solar energy to drive a cleaning mechanism, enhancing efficiency and extending the lifespan of PV modules while eliminating the need for human intervention and external power sources.
Implementation Method 1
A thermomechanical actuator is disclosed. The thermomechanical actuator includes a piston, a solar heat collector, a plurality of springs, a rod, a pulley, a bias load, and a cable. The solar heat collector is in the form of a tube capped on opposing ends with a back cover plate and a front cover plate of equal dimensions, and the solar heat collector contains the plurality of springs. The piston is housed in the interior of the solar heat collector
Implementation Method 2
A solar-driven thermomechanical actuator using shape memory alloys that harnesses solar radiation to create mechanical energy for self-driven cleaning
Implementation Method 3
The solar heat collector is in the form of a tube capped on opposing ends with a back cover plate and a front cover plate of equal dimensions, and the solar heat collector contains the plurality of springs
Implementation Method 4
The bias load includes a mass providing tension to the cable
Data Source
AI summary
The present disclosure provides a thermomechanical actuator and a cleaning system implementing the thermomechanical actuator. The thermomechanical actuator includes a solar heat collector (SHC) housing shape memory alloy springs connected between a piston movably disposed therein and one end of the SHC. A cable extending from the piston through an opposite end of the SHC is connected to a bias load that develops returning force on the springs. In presence of solar radiation, the springs contract and cause linear movement of the piston in a direction of contraction and, in absence of the solar radiation, the springs expand and cause linear movement of the piston in direction of expansion. Useful power and work is extracted in form of the cleaning system from such linear movement of the piston.