What are the disadvantages of solar water heater
Real life with the disadvantages (the two argument to extract):1, is not easy to use in the winter, easy to burst tube. By the installation conditions, not the top floor. By the sun's angle of incidence, the winter need to add auxiliary heat2, life is relatively short (amorphous silicon 15 years completely scrapped), fragile (glass after all rather strong ah, the high price of iron) (compared to the same power equipment, and its cost), environmental limit weight (if a few months overcast days can not be used), accounting for surface large volume (other than the equipment to produce the same power for the large surface area).
(3) low efficiency and high cost: at present, the development level of solar energy utilization is theoretically feasible and technically mature. However, some solar energy utilization devices, because of low efficiency, high cost, in general, the economy can not compete with conventional energy. In the next period of time, the further development of solar energy utilization is mainly restricted by economy.
(2) stability: as a result of the day and night, season, geographic latitude and altitude and other natural conditions and sunny, cloudy, rain clouds and other random factors, so, at a certain ground-based solar irradiance is interrupted, it is also extremely unstable, increasing the difficulty of large-scale application too Yang energy. In order to make solar energy as a continuous, stable energy, and ultimately be able to compete with conventional energy sources of alternative energy sources, it is necessary to solve the storage problem, namely the sunny day the sun radiant energy stored up as far as possible, and for the night or rainy days, but the current utilization of solar energy storage is relatively weak one of the.
(1) dispersion: the total amount of solar radiation reaching the earth's surface is large, but the energy density is low. On average, near the Tropic of cancer, the weather is fine in the summer, the maximum irradiance of solar radiation at noon, in the direction perpendicular to the sun area of 1 square meters of the solar energy received on average is about 1000W; if the year average day and night, only about 200W. In winter, only about half of the cloudy day is generally only about 1/5, so that the energy flow density is very low. Therefore, in the use of solar energy, want to get a certain conversion power, often require a large area of a collection and conversion equipment, higher cost.
