Solar Water Heater (Solar Geyser)

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SOLAR WATER HEATER SYSTEM Configuration Technology: Passive (or Thermosiphon)Geyser (Tank) Capacity: 200 litersMax Hot Water Temperature Obtainable Over 6 Hou...

SOLAR WATER HEATER SYSTEM - SPECIFICATIONS and FEATURES 

Configuration Technology:            Passive (or Thermosiphon)

Geyser (Tank) Capacity:              200 liters

Max Hot Water Temperature

Obtainable Over 6 Hours Sunny Day:   270°Celsius

Average Daily Sun Shine:             6 Hours

Vacuum Tube (or Evacuated Tube):         20 tubes

Inflow Water Capacity:                              200 liters of cold potable water

Outflow Water Capacity:                          200 liters of hot potable water

inflow Polyethylene Pipe Diameter:          25mm (0.984 inch)

Outflow Polyethylene Pipe Diameter:       20mm (0.787 inch)

Inflow Rate of Cold Water:                        17.8 Lit per minute

Inflow Velocity of Cold Water:                    2.58 meter per second

Outflow Rate of Hot Water:                       11.32 liter per minute

Outflow Velocity of Hot Water:                   1.64 meter per second

Inflow Valve Type:                                       Solenoid automatic controlled 12V DC

Outflow Valve Type:                                    Gate valve (manual)

Geyser (water tank) Platform Height:        13.6 meter

Other Features:                                          230V/50Hz electric heating element

Solar Water Heater Vid Clip 1

Configuration Technology: Passive (or Thermosiphon)Geyser (Tank) Capacity: 200 litersMax Hot Water Temperature Obtainable Over 6 Hours Sunny Day: 270°CelsiusAverage Daily ...

Explaining The Technology

The SWH system, is the conversion of sunlight into heat for water heating using a solar thermal collector. SWH Systems are widely used for residential and some industrial applications.

The core of a solar water heater (SWH) is a solar collector (flat plate or evacuated tubes) and a storage tank (geyser). The water is heated up as it travels through the collector (convection process) and hot water is transferred back to the geyser where it is stored.

There are 2 basic types of Solar Water Heater Configurations, namely:

Direct (Open-Loop Or Passive Or Thermosiphon) And Indirect (Closed-Loop Or Active Or Pumped) Configurations

Direct Or Open Loop Configuration is one in which the potable water held in the geyser circulates directly from the tank to the solar collector and back again, in effect the water is heated directly as it passes through the solar collector.

Hence, a passive or thermosiphon configuration is the most basic of the two where the geyser is located above the solar collector, either externally on the roof or on a raised internal frame inside the roof space.

Hot water from the top of the collector rises naturally back into geyser while the denser, colder water from the geyser flows to the bottom of the collector to be heated. This is called the thermosiphon effect and can beseen in the demonstrative diagram.

Indirect (Closed-Loop Or Active Or Pumped) Configuration is one in which the fluid that flows to the solar collector is not the actual geyser water itself but rather a glycol mixture, contained within a closed loop, running from the geyser to the collector and back again.The water in the geyser is heated indirectly as the glycol mixture returns from the solar collector and passes through a heat exchanger (or coil) located inside the geyser.

An active or pumped configuration is one in which the geyser is located below the solar collector, usually inside the roof space where a conventional geyser would be located. In these systems, a small, energy efficient circulation pump is used to pump the water around the solar system from the geyser to the collector and back again.

Pumped systems are technically more advanced than passive systems, giving the homeowner more control and interaction with their solar system through an easy to use digital, solar controller interface. The diagram opposite illustrates a standard pumped system configuration.

Application

Indirect Systems are generally only required in frost prone areas where water in a direct system would be likely to freeze, expand and burst the external copper pipes in the solar system. Indirect systems should also be considered in rural areas where poor water quality can, over time, cause damage to the solar collector.