# US 11,121,672 B2 · Solar energy harvesting apparatus with turbulent airflow cleaning

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- Number: US 11,121,672 B2
- Document ID: US11121672B2
- Status: Granted
- Kind: B2
- Application number: 17/019,510
- Filed: 2020-09-14
- Published: 2020-12-31
- Granted: 2021-09-14
- Earliest claimed: 2018-07-10
- Assignees: King Abdulaziz University
- Applicants: King Abdulaziz University
- Inventors: Hussain Bassi
- Web page: https://patentgrep.com/patent/US11121672B2

## CPC

- H02S 20/32: specially adapted for solar tracking
- H02S 40/10: Cleaning arrangements
- H02S 40/22: Light-reflecting or light-concentrating means (directly associated with the PV cell or integrated with the PV cell H10F77/42)
- H02S 40/425: {using a gaseous or a liquid coolant, e.g. air flow ventilation, water circulation}
- Y02E 10/52: PV systems with concentrators
- H02S: GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES (obtaining electrical energy from radioactive sources G21H1/12; light sensitive inorganic semiconductor devices H10F; light sensitive organic semiconductor devices H10K30/00; thermoelectric devices H10N10/00; pyroelectric devices H10N15/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A photovoltaic system includes a photovoltaic cell including a sun tracker, a top surface configured to generate electrical energy from the incident sunlight, and a bottom surface configured to thermally dispel heat generated by the photovoltaic cell; at least one mirror including a reflective surface; a plurality of actuators securing the at least one mirror the photovoltaic cell; at least one actuator pump connected to the plurality of actuators and configured to extend or retract the plurality of actuators and adjust the distance of the at least one mirror from the top surface; a heat exchanger thermally coupled to the bottom surface of the photovoltaic cell; and a fluid pump connected to the heat exchanger and configured to circulate the fluid through the heat exchanger.

## Claims

### Claim 1

A solar energy harvesting apparatus with turbulent flow cleaning, comprising:
a photovoltaic cell including:
a sun tracker including circuitry configured to determine an angle and an intensity of incident sunlight and the position of the sun relative to the solar energy generating apparatus and adjust a rotation angle of a plurality of mirrors to reflect the incident sunlight onto a top surface of the photovoltaic cell
configured to generate electrical energy from the incident sunlight, wherein the plurality of mirrors and the top surface of the photovoltaic cell are rectangular and a long axis of each of the plurality of mirrors are parallel to a long axis of the photovoltaic cell; and
a bottom surface configured to thermally dispel heat;
wherein each of the plurality of mirrors includes a reflective surface disposed proximal to the top surface of the photovoltaic cell;
a plurality of hydraulic actuators each having a first end and a second end, wherein the first end is attached to the photovoltaic cell and the second end is attached to at least one of the plurality of mirrors;
at least one hydraulic actuator pump connected to the plurality of hydraulic actuators and configured to extend or retract the plurality of hydraulic actuators and adjust the distance of each of the plurality of mirrors from the top surface of the photovoltaic cell, wherein the hydraulic actuator pump is further connected to the heat exchanger and is configured to inject or withdraw a hydraulic fluid, wherein the hydraulic fluid is passed through the plurality of hydraulic actuators, a heat exchanger, and a radiator, which draws heat from the photovoltaic cell;
wherein the heat exchanger is filled with the hydraulic fluid and disposed adjacent to and thermally coupled to the bottom surface of the photovoltaic cell;
wherein the radiator is connected to the heat exchanger and is configured to cool the hydraulic fluid via thermal exchange with an external medium; and
a fluid pump connected to the heat exchanger and configured to circulate the hydraulic fluid through the heat exchanger, and
a motor attached to the second end of the plurality of hydraulic actuators, wherein the at least one of the plurality of mirrors is secured to the motor and the motor is configured to rotate the at least one mirror.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein
the photovoltaic cell is configured to detect the presence of foreign matter on the top surface of the photovoltaic cell and initiate a cleaning procedure;
the cleaning procedure includes rotating the plurality of mirrors to generate turbulent air flow and clean the surface of the photovoltaic cell.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein
at least one of the plurality of mirrors includes two side mirrors having;
a reflective surface; and
the side mirrors being adjustable from a first position behind the reflective surface of the at least one of the plurality of mirrors to a second position adjacent to an edge of the at least one of the plurality of mirrors.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the photovoltaic cell is further configured to:
detect a decrease in energy generation from the incident sunlight; and
in response to the detected incident sunlight being below a threshold, the photovoltaic cell is further configured to adjust the orientation of the plurality of mirrors such that the reflective surface of the plurality of mirrors is facing the top surface of the photovoltaic cell and the plane of each of the plurality of mirrors is nearly parallel with the plane of the top surface of the photovoltaic cell.