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Thermosyphon Solar Water Heater Systems Working Principle
Thermosyphon systems in global terms represent the most common solar system type. In warmer countries around the Mediterraean, in Africa, Asia and particularly China, thermosyphon systems would be regarded as the norm. Thermosyphon solar heaters do not have pumps or controls in their most typical configuration. They are based on a basic convection principle: hot water rises and cold water sinks. As the potable water (or an antifreeze fluid, in colder climates) entered into the solar panel, it warms and rises to the top and to the tank, where it is stored (that’s the reason why thermosyphon tanks are always above the collector). In this arrangement the storage tank is mounted above the collector (generally on the roof attached to the top of the collector) so that solar heated water will circulate from the collector to the storage tank by natural convection (natural circulation). As long as freezing is not a problem and ambient temperature is reasonably high, the system can work quite efficiently without an external electrical supply. Provision must be made for coping with thermal expansion in sustained hot weather and this is normally provided by a simple pressure relief valve. These systems are not suitable to our climate due to the risk of freezing and the substantial heat losses that would occur from the exposed storage tank in our windier and cooler conditions. They also impose a substantial roof load that would require additional and general costly roof-strengthening.
Advantages of Thermosyphon Solar Water Heater Systems
1.Thermosyphon systems are cheap, reliable and because they do not have pumps or controls they do not demand any significant maintenance cares.
2.Contrary to batch systems, since the hot water is stored in a well-insulated tank, thermosyphon solar systems do not pose heat loss problems during night-time.
3.Thermosyphon systems are easy to install and to connect to the existing hot water piping.
Disadvantages of Thermosyphon Solar Water Heater Systems
1.Thermosyphon systems depend largely on ambient temperatures, which is a major disadvantage.
2Another possible disadvantage of thermosyphon heaters – when installed on a roof – is their high weight. A tank full of water is a very heavy object that may require the reinforcement of the roof.
3.In fact, they will stop working if outdoor temperatures drop below the freezing point and stay there for long. In that case the system needs to be drained or warmed. To overcome this limitation some manufacturers are equipping their thermosyphon solar systems with small circulating pumps that are turned on in very cold weather conditions in order to move the water and to prevent it from freezing. Only in this case, thermosyphon systems are truly an all-climate solution.
Features of Thermosyphon Solar Water Heater System
Commonpraise thermosyphon system adopts black or anodized coating flat plate solar collector.Thermosiphon circulation minimizes maintenance.Unpressurized storage tank with SUS304 as inner material, reliable and low maintenance operation.Flexible option of solar collector and water tank capacity.Using durable SUS304 corrugated stainless steel as the circulation pipe.Insulation for circulation pipe is EPDM with PE film, withstand high temperature, UV resistance and fire resistance.Easy mounting, installation and maintenance.Specification of Thermosyphon Solar Water Heater Systems
100L Solar Water Heater | |
Description | Specification |
Water Tank | 1pc |
Capacity | 100L |
Dimension | Φ460mm*1056mm(Including length of outlet and inlet pipes) |
Inner Tank Material | 0.5mm SUS304-2B |
Shell Material | 0.5mm color steel |
Thermal insulation | 50mm polyurethane |
Electric Heating Element | 1.5KW |
Inlet &Outlet of water tank | G3/4” inner thread |
Accessory | float valve |
Solar Collector | 1pc |
Dimension of solar collector L*W | 2000mm*1000mm*80mm |
Efficiency area(m²) | 1.82m2 |
Absorber | Cu & Al ,Anodized-Oxidized Coating;ultrasonic welding |
Header | Φ22mm*0.6mm, 2pcs, Copper TP2 |
Riser | Φ8mm*0.5mm, 7pcs, Copper TP2 |
Insulation | 16K Fiber glass insulation (back:30mm);Polyurethane (side:25mm) |
Cover | 3.2mm Low-iron tempered glass |
Brackets | Galvanized angle steel for slope roof |
Intelligent controller | 1pc |
Other Accessories | |
Connection pipes and Insulation | Copper water pipe (Diameter22*0.8mm |
Thermosyphon Solar Water Heater