In large installations in which to meet the hot water needs of many system comprises a number of collectors, specifically used separate sites on earth. Bearing structure is dimensioned for snow loads and wind pressure. For multiple alignment of the collectors is necessary to determine the appropriate distance between them so as to prevent or limit the shading of each line. The most favorable conditions for shading occur at sunrise and sunset when the sun altitude angle and intensity are the lowest values. In the absence of sufficient space for installation allow shading of sunrise and sunset, but its losses from shading should not exceed 10% of spillage collectors of solar radiation in the absence of shading. The length of lines does not significantly affect shading.
Collector connection
In this paper we continue the current theme for the production of hot water with solar collector systems with forced circulation of the coolant.
While differing in the number of circulating circles, these systems are characterized by a number of common characteristics. Firstly, it’s total operating principle based on natural circulation. Another common characteristic between the direct and indirect solar systems with natural circulation is the use of an additional source of energy. In the form of electrical or other heater he installed in the battery container. When the intensity of solar radiation is insufficient to heat water in the tank to the desired values, such as prolonged or turning cloudy in winter, the heater turns on automatically and dozagryava water to the required temperature.
A key element in systems with forced, called and forced circulation of the coolant is pump. Is advisable to use more automation to monitor water temperature in the battery, which is because the system runs continuously, even in the absence of sunlight, for example at night or in cloudy weather. Therefore, instead of heat, water will cool the battery. It is to not allow this element of the system are sensors to monitor water temperature in the battery. Depending on the signal generated by them, the pump will turn on only when the water temperature in the battery is lower than the collector or depending on the desired temperature. Pump and additional automation, of course, expensive system. The larger number of elements of the systems with forced circulation determines in its complicated installation, setup and repair. But these systems are characterized by higher efficiency, allowing to reduce the collector area as the extraction of heat from the unit area is larger.
Unlike systems with natural circulation in the pump header systems, there is no requirement for installation of the battery court higher than the collector. The installation of the collector could be done on the roof. A battery can be mounted anywhere in the building.
Forced circulation systems are more effective
A key element in systems with forced, called and forced circulation of the coolant is pump. Is advisable to use more automation to monitor water temperature in the battery, which is because the system runs continuously, even in the absence of sunlight, for example at night or in cloudy weather. Therefore, instead of heat, water will cool the battery. It is to not allow this element of the system are sensors to monitor water temperature in the battery. Depending on the signal generated by them, the pump will turn on only when the water temperature in the battery is lower than the collector or depending on the desired temperature. Pump and additional automation, of course, expensive system. The larger number of elements of the systems with forced circulation determines in its complicated installation, setup and repair. But these systems are characterized by higher efficiency, allowing to reduce the collector area as the extraction of heat from the unit area is larger.
Unlike systems with natural circulation in the pump header systems, there is no requirement for installation of the battery court higher than the collector. The installation of the collector could be done on the roof. A battery can be mounted anywhere in the building.
Direct solar installations with forced circulation are effective but not suitable for geographic areas with hard water, and for applications in which water has a higher acidity. Their development is appropriate in areas with mild climates where temperatures rarely fall below zero degrees. It is recommended to ensure protection against freezing of water. Indirect solar systems with forced circulation are suitable for regions with long periods of subzero temperatures.
In comparison, direct systems the risk of corrosion is much greater. In the design of solar systems to achieve high efficiency, ie reached the maximum utilization of solar energy collectors on should take account of complex factors. Among them, along with the type of solar installation and type of collectors are and how their assembly, including the location, orientation and angle of mounting of collectors.
Collectors are part of the architecture of the building.
Collectors are part of the architecture of the building.
When choosing a location for mounting the collector is well to bear in mind that it absorbs the largest amount of solar energy, where the plane is perpendicular to the direction of the sun. In different seasons, however, the angle at which sunlight reaches the Earth at a certain point it is different. In order to achieve maximum efficiency are developed assembly systems that follow the solar disk, as in the daily time and depending on the season. In standard header systems are widely used at home, follow the principle of constant orientation to the plane of the collector in accordance with daily and annual position of the sun, to use the greatest amount of solar energy. It is imperative that the orientation of the collector is in the south.
At worst, failing to comply with this condition is allowed to the collector is oriented to the southeast or southwest. The recommended slope of the collector should be in the range of 30 to 60 degrees as the optimum is considered the slope of 40-45 degrees. Manufacturers claim that in this orientation and inclination total nonstop energy transformation is maximum.
At worst, failing to comply with this condition is allowed to the collector is oriented to the southeast or southwest. The recommended slope of the collector should be in the range of 30 to 60 degrees as the optimum is considered the slope of 40-45 degrees. Manufacturers claim that in this orientation and inclination total nonstop energy transformation is maximum.
Technical problem with this type of installation is to achieve good consolidation of the collector on the roof. In cases where the collectors are mounted on flat roof.
Technical problem with this type of installation is to achieve good consolidation of the collector on the roof. In cases where the collectors are mounted on flat roof.
they are placed on a special bearing metal structure, usually made of steel profiles. On the supporting structure is mounted not only collectors, but also flowing. Advantages of this type of installation have the option of heaven collector orientation and tilt. A fault is considered not particularly aesthetic appearance of the collector field and the need for additional investment in thermal insulation and protect pipes from the weather.
Collector connection
they are placed on a special bearing metal structure, usually made of steel profiles. On the supporting structure is mounted not only collectors, but also flowing. Advantages of this type of installation have the option of heaven collector orientation and tilt. A fault is considered not particularly aesthetic appearance of the collector field and the need for additional investment in thermal insulation and protect pipes from the weather.
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