Radiators: Critical Components for your Domestic Central Heating
Using a simple illustration from the motor car world, one can refer to the boiler as the engine of the central heating system. Subsequently, the radiators are the wheels that transfer the energy to the road, and helping the system deliver its potential. Radiators make a major difference to the effectiveness and performance of a domestic central heating system through their design, location and size. Quite often it is the boiler which is the focus when discussing your domestic heating needs. However, the heat that is generated by the boiler has to pass through the radiators to ensure it actually radiates out into the living space in the most effective way.
It might come as a surprise that those sleek looking stainless steel radiators offered by most UK plumbing and heating merchants date back more than 150 years. The first radiator was registered as a patent in 1855 by Franz Sangalli, a German engineer. In effect, despite considerable visual differences, the main working structure of the radiator is the same as the ones registered initially by Mr. Sangalli. The radiators are effectively a hollow case made of metal, shaped as a flat box and attached to the wall to maximize radiation of heat into the room.
In the UK, most heating radiators are made of sheet metal and have additional fins attached to them for better heat emission. Hot water (or other heat transferring medium) is pumped through the radiator (often coming in at the top of the radiator) and is gradually losing its heat to the surrounding ambiance. Once the water loses its heat it drops by gravity and comes out of the egress valve (normally at the bottom). As the air around the radiator heats up, its rises to the top of the room, creating a convection effect and drawing colder air closer to the radiator to continue the heating cycle.
Like many closed loop systems with a heat transfer liquid within them, the radiators and the pipes develop air pockets. Over time air bubbles are seeping through tiny cracks in the system causing air pockets. By using a professional plumber you would reduce the risk of such air pockets as they are likely to use good quality compression fittings that minimize the risk of such cracks.
An alternative explanation for the bubbles within the circulation loop is that they are the result of a chemical reaction that occurs when copper piping and other metals are in continuous contact with very hot water. Such reactions lead to tiny bubbles of hydrogen that float within the system and find their way to the upper most point of the closed loop heating system. This explains why it is often the top of the radiator that remains cold (as it is filled with gas rather than hot water). Is such cases it is recommended to bleed the radiator from the bleeding valve at the top of the radiator, using a special bleeding key. Such keys can be found in all major DIY stores in the UK.
Radiators may suffer from another problem due to their chemical make. As hot water comes in contact with iron and other metals the reaction releases not only gases but also other chemical deposits which clog the system and reduce its performance. This problem is more acute with older systems and in extreme cases can make the central heating system completely in-effective.
Modern plumbers reduce the risk of such corrosion by adding a corrosion inhibitor to the mix of liquids within the central heating loop. In addition most plumbers these days power flush the system before filling it up to remove any such deposits and sludge. It is important to notice that power flush can remove debris even from brand new systems. Such debris can be a result of the metal workings and the manufacturing process of the radiator units or the copper piping.
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