Five characteristics of solar water heater output hot water

 

Solar water heater is a water heater that is heated by the sun's light into a heat source. Its principle is to use many all-glass vacuum solar collector tubes to absorb the solar wave to heat the water, and then concentrate the storage in the heat preservation of the water container to continuously provide domestic hot water. One of the most Chinese characteristics of the drop type solar water heater is the use of a specific photothermal collection device to absorb the thermal radiation of the sun, and with good thermal insulation performance of the water storage device to form a zero-power thermal circulation system, automatic room temperature cold water heating and storage, the sun is broken, the circulation heating. Its characteristic is that the pressure in the water storage tank is equal to the atmospheric pressure, and the height difference between the water heater and the water point determines the output pressure and flow rate. Solar water heaters and electric water heaters and gas water heaters and other water heaters compared, it has incomparable superiority, its greatest advantages reflected in the economy, energy saving, environmental protection and inexhaustible. "Solar energy" as the world's most "clean" energy, its no pollution and inexhaustible characteristics, as well as an investment in the long-term benefits of the superior, so that its application field continues to expand and consumer groups surge. Solar water heater into the hot water output and cold water supply is two sets of independent water supply systems, and gas water heater and electric water heater and other water heater needed water sources are from the same municipal tap water namely water pressure is basically equal, there is an essential difference between them.

(1) Long hot water generation cycle -- Restricted by the length of the sun's sunshine time, the solar water heater adopts the heating method of water storage in cans, and the hot water production is limited by the volume of the water storage tank. Once the hot water is exhausted, hot water regeneration cannot be realized in a short time;

(2) the hot water output pressure is low - drop solar water heater installation height restrictions, hot water output pressure is usually several times lower than the cold water supply pressure or even ten times (hot water pressure is usually only 0.02 ~ 0.05Mpa; And the cold water pressure that matches the use is generally municipal tap water, its pressure is 0.15 ~ 0.5MPa);

③ Large temperature difference of hot water output -- The hot water output temperature of the solar water heater is affected by season, climate, air temperature and sunshine and other factors, and its hot water output temperature varies greatly. In addition, the hot water output pressure of the drop type solar water heater will gradually decrease with the decrease of the water level in the storage tank, and the output water temperature will gradually rise with the increase of the hot water consumption. The output water temperature of the pressurized solar water heater will gradually become higher with the increase of hot water consumption. In the period of high temperature and sufficient sunshine or in the season of sunny and rainy interwoven, the absolute value of temperature difference of hot water output can often be as high as 50℃ or more during the use process.

(4) The output temperature of hot water is high -- because the upper limit temperature of hot water heating of the solar water heater can not be set and controlled artificially, the output water temperature often reaches the boiling point in the hot summer and scorching sun, and the pressure temperature in the storage tank of the pressurized solar water heater can reach 120℃, and the phenomenon of ultra-high temperature hot water output is inevitable;

(5) Two sets of water supply systems of different nature are independent of each other -- solar water heater output is ultra-low pressure and high temperature hot water and municipal water supply is relatively high pressure and low temperature cold water. Therefore, it is necessary for the constant temperature mixed water valve to have the necessary functions of anti-hot, anti-flow and stability of outlet water temperature.