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What are the disadvantages of solar hot water?

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  • Date:2022/06/06

Advantages and disadvantages of solar energy

Advantages of solar water heaters

  • 1. The solar water heater system is fully automatic and static operation, no need for special care, no noise, no pollution, no danger of leakage, fire, poisoning, etc., safe and reliable, environmental protection and energy saving, benefit the country and the people.
  • 2. The system has good thermal insulation performance and large thermal storage energy. The thermal insulation water tank has a water storage function, which can meet the needs of a large number of people to use hot water in a concentrated manner, and can also be used as an emergency water source when the water is cut off.
  • 3. With the function of sewage purification, the water source is clean and pollution-free.
  • 4. Solar energy is a renewable energy source, which is inexhaustible, environmentally friendly and pollution-free. Only sunlight can cause abnormal operation. The energy-saving effect of solar water heaters is obvious, which can save a lot of electricity costs. Once invested, the investment can be recovered within 2 or 3 years.
  • 5. Solar energy only absorbs sunlight for heating, there is no danger of gas poisoning and electric shock, and it is safe and reliable to use. In addition, solar water heaters are designed to last for 10 years.
  • 6. High-tech products, copper-aluminum anodized composite core or full copper core, high surface treatment technology, good heat transfer performance, strong heat absorption capacity, and large water production.

  

Disadvantages of solar water heaters

  • 1. Solar water heaters rely heavily on sunlight. In cloudy days or in winter, the heating effect will immediately deteriorate. It can be used all year round. If electric heating is used, the power consumption is very large.
  • 2. It takes a whole day of sunshine to heat the water. When the weather is good, only hot water can be guaranteed at night. There is very little hot water available during the day and night. It cannot guarantee a 24-hour hot water supply for users, and the comfort is poor.
  • 3. The lighting panel of the solar water heater must be installed on the roof, which is not only huge and bulky, but also affects the aesthetics of the building (the more high-end residential areas are, the more obvious it is), and it is easy to damage the roof waterproof layer.
  • 4. If the solar water heater is installed at a high place, it must be ensured that it is within the protection range of the lightning rod, or add lightning protection facilities to the solar water heater to avoid lightning strikes.
  • 5. The installation procedure of solar water heater is complicated. If it is installed improperly, it will not only have hidden safety hazards, but also affect the appearance. Moreover, solar water heaters are generally installed on the roof, and routine maintenance is troublesome.
  • 6. The hot water pipeline is more than ten meters long, and a lot of water is wasted every time it is used; photoelectric complementarity cannot be properly realized in fact.

 

What is solar energy?

Technical principle

  • Solar energy is produced by the fusion of hydrogen and helium atoms in the sun to release huge nuclear energy, which is the radiation energy from the sun. The vast majority of human energy needs come directly or indirectly from the sun. Plants release oxygen through photosynthesis, absorb carbon dioxide, and convert solar energy into chemical energy for storage in plants. Fossil fuels such as coal, oil, and natural gas are also primary energy sources that evolved from animals and plants buried underground in ancient times over a long period of geological time. The energy contained in the earth itself usually refers to the energy related to the thermal energy inside the earth and the energy related to the nuclear reaction.

Annotation

  • It is a clean, renewable energy source that is widely used around the world. At present, limited by the level of capital and technology, only a small proportion of the sun's energy has been effectively developed and utilized. Although a clean and renewable energy source, solar energy is far from being a perfect form of energy and is unlikely to replace other forms of energy. Consumers and businesses should consider the many advantages and disadvantages of solar energy before deciding whether to utilize the sun's energy.
  • One must recognize the many advantages and disadvantages of solar energy before making a decision to switch to expensive solar energy. Using this energy source does have its benefits. Solar panels do not have any pollution, and there is little pollution during their production. Solar panels generate energy silently, in that sense, at least uninterrupted. As long as solar panels are not damaged, they can provide free energy to a home or business year-round.
  • While providing free energy year-round and reducing reliance on fossil fuels may sound like feats, the pros and cons of solar power cannot be tested without paying attention to its price, which is considered the biggest obstacle to converting to solar energy.

 

Main categories of solar energy

Photovoltaic

  • A photovoltaic panel module is a power generation device that generates direct current when exposed to sunlight, and consists of solid photovoltaic cells made almost entirely of semiconductor materials such as silicon. Simple photovoltaic cells can provide energy for watches and computers, and more complex photovoltaic systems can provide lighting for houses as well as traffic lights and monitoring systems, which are integrated into the grid.

Photothermal

  • Modern solar thermal technology aggregates sunlight and uses its energy to generate hot water, steam and electricity. In addition to using appropriate technology to harvest solar energy, buildings can also harness the sun's light and heat by incorporating appropriate equipment in the design, such as giant south-facing windows or using building materials that absorb and slowly release the sun's heat .

 

Solar application field

Photothermal utilization

  • Its basic principle is to collect solar radiation energy and convert it into heat energy through interaction with matter. At present, the most used solar collectors mainly include flat plate collectors, evacuated tube collectors, ceramic solar collectors and focusing collectors.

Solar energy generation

  • The large-scale utilization of solar energy in the future of Qingli New Energy is to generate electricity. There are many ways to use solar power to generate electricity. At present, there are mainly the following two types.
  • (1) Light-heat-electricity conversion. That is, the use of heat generated by solar radiation to generate electricity. Generally, solar collectors are used to convert the absorbed thermal energy into steam of the working medium, and then the steam drives the gas turbine to drive the generator to generate electricity. The former process is light-thermal conversion, and the latter process is thermal-electrical conversion.
  • (2) Optical-electrical conversion. Its basic principle is to use the photovoltaic effect to directly convert solar radiation energy into electrical energy, and its basic device is a solar cell.
  • (3) Light-to-chemical conversion

Photochemical utilization

  • This is a photo-chemical conversion method that utilizes solar radiation to directly split water to produce hydrogen. It includes photosynthesis, photoelectrochemical action, photosensitive chemical action and photolysis reaction.
  • Photochemical conversion is the process of converting into chemical energy due to the absorption of light radiation resulting in a chemical reaction. Its basic forms include photosynthesis of plants and photochemical reactions that utilize chemical changes in substances to store solar energy.

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