Technical manual

SOLAR

Each component in the solar thermal system fulfils a specific function which is described below:

Solar thermal collector

The solar thermal collector receives the solar radiation, converts it into thermal energy and passes it on to the heat transfer fluid.

Heat transfer fluid

The heat transfer fluid circulates through the solar collector, the pipe work and the heat exchanger. It transfers the energy gained by the collector into the storage device. The heat transfer fluid has additional properties such as frost protection and anti-corrosion inhibitors to ensure a long and reliable operation of the solar thermal system.

Pipe work

The pipe work connects the various components of the solar thermal system to allow the heat transfer medium to transport the energy from the collector to the storage de- vice. The pipe work must be insulated and both, the pipe work and the insulation must be of appropriate material for solar thermal applications.

Pump and safety equipment

The pump and safety equipment are combined in the pump unit. Beside the actual cir- culation pump the pump unit contains a flow meter, flush and fill point, air separator, non return valves, manual thermometers, isolating valves, pressure relief valve, pres- sure gauge and the connection point for the expansion vessel.

Heat exchanger

The heat exchanger allows a hydraulic separation of systems but allows the transfer of energy between the two systems, i.e. the solar circuit and the wholesome water. In a domestic solar thermal hot water system the heat exchanger is usually in form of a coil immersed in the wholesome water inside the hot water cylinder.

To ensure the solar thermal system works at its optimum efficiency, the heat exchanger has to be sufficiently sized and positioned correctly within the hot water cylinder.

Storage facility

The storage facility is most likely to be a domestic hot water cylinder or a buffer vessel. As the solar thermal system will not always be able to supply all of the required energy, it is important that an auxiliary heating system is available to boost the system as and when required.

The storage facility should be of such design that all energy sources can work inde- pendent of each other without compromising each others efficiencies, giving solar ther- mal the priority to allow for maximum energy gain.

Control unit

The control unit has the primary function of switching the circulation pump on and off ensuring that the maximum amount of energy is being transferred from the solar ther- mal collector into the storage facility.

The control unit is usually also the user interface with the system and has therefore a display and additional functions to ease the operation, maintenance and control of the system.

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ST0133 – A 02/09

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Dimplex ST0133 Solar thermal collector, Heat transfer fluid, Pipe work, Pump and safety equipment, Heat exchanger

ST0133 specifications

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Safety features are paramount in the Dimplex ST0133 design. It is equipped with a thermal cut-out system that prevents overheating, ensuring safe operation even in prolonged use. The unit is also designed with a child lock feature, providing peace of mind for families with young children.

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