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Air-cooled and water-cooled PV/T system for improving solar photovoltaic thermal efficiency

A solar photovoltaic and thermal efficiency technology, applied in the field of PV/T systems, can solve problems such as poor cooling effect, reduced photovoltaic power generation efficiency, and damage, and achieve the effects of avoiding device damage, improving photoelectric efficiency, and reducing photothermal efficiency

Active Publication Date: 2019-04-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature of the battery gradually rises, and for the solar cell running in a short time, it will lead to a decrease in the photovoltaic power generation efficiency (the efficiency of the solar cell temperature increases by 0.2%-0.6%), and the long-term operation will lead to its overall performance. decline, even irreversible damage
In order to solve the problem that the temperature of the solar panel is too high to reduce its efficiency, there are currently two main solutions: air-cooled and water-cooled solar PV / T systems
In the air-cooled system, air is used as the cooling medium, and the air cools the solar cells through natural circulation or forced circulation, but the cooling effect of the air-cooled system is poor and the temperature of the panels is uneven
In the water-cooled system, water is used as the cooling medium. The cooling effect of the water-cooled system is good, but when the ambient temperature is too low, the freezing of the working medium will cause damage to the device.

Method used

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  • Air-cooled and water-cooled PV/T system for improving solar photovoltaic thermal efficiency
  • Air-cooled and water-cooled PV/T system for improving solar photovoltaic thermal efficiency

Examples

Experimental program
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Effect test

Embodiment 1

[0025]A PV / T system combining air cooling and water cooling to improve solar photovoltaic thermal efficiency, including cold water inlet 1, water inlet valve 2, water pump 3, valve Ⅰ4, solar panel 5, valve Ⅱ6, valve Ⅲ7, heat exchanger 8, spiral Pipeline 9, hot water tank 10, valve Ⅳ11, valve Ⅴ12, fan 13, valve Ⅵ14, water inlet pipe 15, circulating water pipe 16, return water pipe 17, air outlet pipe 18, air inlet pipe 19, air return pipe 20, water outlet pipe 21, water outlet valve 22. Thermocouple thermometer 23, insulation material 24, flat heat pipe 25, cooling channel 26, solar battery 27, EVA material 28, tempered glass 29, water level gauge 30,

[0026] Solar cell panel 5 comprises insulation material 24, flat heat pipe 25, cooling channel 26, solar cell 27, EVA material 28, tempered glass 29, and solar cell 27 is provided with EVA material 28, tempered glass 29 successively, below solar cell 27 The flat heat pipe 25, the heat dissipation channel 26, and the thermal insu...

Embodiment 2

[0028] In spring and summer (minimum temperature > 10°C), the device in Example 1 is used, and the insulation material 24 is a polystyrene board. The specific usage method is as follows:

[0029] When all other valves are closed, open the water inlet valve 2, the cold water enters the water inlet pipe 15, turn on the water pump 3 and valve I4, and the cold water enters the heat dissipation channel 26 of the solar panel 5, and after the solar panel 5 is radiated, Open the valve III7, water flows into the heat exchanger 8 from the return pipe 17, and after the water level gauge 30 in the heat exchanger 8 shows that the water level reaches a certain height, close the water inlet valve 2, open the valve II6, and the water in the heat exchanger 8 is re-discharged. The water pump 3 is pumped into the heat dissipation channel 26 of the solar panel 5. After the solar panel 5 is radiated heat, the water enters the heat exchanger 8 again, and the cycle is repeated until the thermocouple ...

Embodiment 3

[0031] In autumn and winter (minimum temperature ≤ 10°C), the device in Example 1 is used, and the insulation material 24 is phenolic foam. The specific usage method is as follows:

[0032] When all other valves are closed, open the valve V12 and the water outlet valve 22 to release all the water inside the system, the air enters the heat dissipation channel 26 of the solar panel 5 from the valve V12, close the valve V12 and the water outlet valve 22, Open water inlet valve 2, valve Ⅱ6, use the water pressure of tap water to introduce water into heat exchanger 8, when the water level measured by water level gauge 30 reaches the requirement, close water inlet valve 2, water pump 3, valve Ⅱ6, open valve Ⅳ11, Fan 13, valve VI 14, the fan 13 pumps the air from the heat dissipation channel 26 of the solar panel 5 into the air outlet pipe 18, and enters the spiral pipe 9 of the heat exchanger 8, and the air is pumped by the outside of the spiral pipe 9 (heat exchanger 8 The cold wat...

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Abstract

The invention discloses an air-cooled and water-cooled PV / T system for improving solar photovoltaic thermal efficiency, which includes a cold water inlet, a water inlet valve, a water pump, a valve I,a solar cell panel, a valve II, a valve III, a heat exchanger, a spiral pipe, a hot water tank, a valve IV, a valve V, a fan, a valve VI, a water inlet pipe, a circulating water pipe, a water returnpipe, an air outlet pipe, an air inlet pipe, an air return pipe, a water outlet pipe and a water outlet valve. The low-grade heat energy generated by the photovoltaic cell panel is recycled and utilized to reduce the photo-thermal efficiency, so as to reduce the temperature of the photovoltaic cell panel and improve the service life of the photovoltaic cell panel and the photoelectric efficiency of solar energy. Moreover, different heat dissipating agents and different structural designs are adopted in different seasons, the system can work all year round, and device damage caused by water freezing in winter can be avoided.

Description

technical field [0001] The invention relates to a PV / T system combining air cooling and water cooling for improving solar photovoltaic thermal efficiency, and belongs to the technical field of solar power generation. Background technique [0002] With the rapid development of my country's economy, my country's demand for energy is also showing a rapid growth trend. At present, in my country's energy consumption, the excessive use of coal and other fossil energy has led to serious environmental pollution in my country, exacerbated the shortage of energy, and greatly restricted the healthy development of my country's economy. The development and utilization of renewable energy is an important guarantee for the sustainable development of our country's social economy. Solar energy is a very good renewable energy because of its ubiquity, cleanness and pollution-free, inexhaustible and huge amount. At present, the governments of various countries regard the utilization of solar ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/42H02S40/44
CPCH02S40/425H02S40/44Y02E10/50Y02E10/60
Inventor 李法社隋猛张博然张丽娟张逸水
Owner KUNMING UNIV OF SCI & TECH