With the continuous development of The Times, refrigeration technology is also in constant development, energy consumption also continues to grow, environmental pollution problem is also more serious, so in the 21st century our science and technology continuous development of innovation, the country in the process of science and technology development also great importance to energy saving and environmental protection. Energy saving reduces emission from energy Angle speaking, can promote our economy sustainable development. But solar energy is not always good, there are also disadvantages of solar energy.

Saving electric energy to promote sustainable development of society has become the common goal of the whole society. Energy is the material basis of human social activities. The development and utilization of new energy is the common understanding of mankind. Solar energy is a kind of clean natural renewable energy, inexhaustible and inexhaustible. The development and utilization of solar energy will neither pollute the atmosphere nor affect the ecological balance of nature. In addition, as long as the sunshine reaches the place, there is solar energy can be used. Solar energy is favored by people for its long-term, renewable and pollution-free advantages. Solar energy has become an important part of human energy use, and has been developing. Solar energy can be used in two ways: photothermal conversion and photoelectric conversion. Solar power generation is a new renewable energy.

In today's world, conventional energy is gradually decreasing, while the world population is growing year by year, science and technology is developing rapidly, in the near future, the existing energy conversion system will inevitably have a great change, will undoubtedly use some new energy, and solar energy will play an important role. Solar energy will become a more important source of power. The development and utilization of solar energy is the long-term goal of human society. Science and technology is changing our lives. We hope people can make better use of natural resources around us and make our world and life more beautiful and environmentally friendly.

At present, the application of solar cells from the military field, aerospace field into industrial, commercial, agricultural and other industries and communication, household appliances and public facilities, especially in remote areas, mountains, deserts, islands and rural areas to save the cost of high power transmission lines. But at this stage, it is expensive, costing tens of thousands of dollars to generate a kilowatt of electricity, so large-scale use remains economically limited.

In the long run, with the improvement of solar cell manufacturing technology and the invention of new photoelectric conversion devices, the protection of the environment and the great demand for renewable clean energy in various countries, solar cells will still be a more practical way to use solar radiation energy, which can open up broad prospects for the large-scale use of solar energy in the future.