Oxypod is brought to you by the Goodwin Development Trust working in partnership with 21C Eco Energy

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How Oxypod™ works

(in a bit more detail)

Oxypod™ is a 'de-aerator' which removes air from water and is designed to be installed in water-based central heating & cooling systems. The heating or cooling system can be a traditional gas or oil boiler, a biomass system or a ground or air-source heat pump.

Water from our mains is infused with air. It holds roughly 2.5% of its volume as dissolved air.

Henry's Law, one of the laws of physics states: 'the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid'. Oxypod™ combines the physics of Henry's Law and implosion technology to remove the air from the water in central heating or cooling systems.

Oxypod™ is egg shaped; as water passes through it and begins to spin, it cannot form a vortex because of the shape of the body. The water implodes in on its self, stripping away the surface tension. This helps in the release of dissolved air. The water is then driven downwards, where a vortex forms in the vertical pipe work (300mm to 600mm) under the Oxypod™. This continues the process of removing dissolved air from the system very quickly!


The problem with dissolved air

When water passes through a heating system, its temperature rises, reducing its capacity to hold dissolved air. This air (mainly nitrogen & oxygen) forms into bubbles which gather in radiators and line the pipes and radiators with a thin layer of air bubbles causing a thermal barrier. The air bubbles also increase surface friction, which adversely affects the flow of water running through the pipes and radiators.

This is the reason we get cold spots in radiators, and why we often need to bleed our radiators using a radiator key, allowing the air to escape. The build-up of air results in impaired heating performance. As the heating water flows further from the boiler, especially in larger systems, the heating water may not retain enough heat to adequately heat those radiators furthest from the boiler. This typically results in the boiler being operated at a higher temperature than would otherwise be required, leading to increased energy usage and higher bills, as well as an increase in wear and tear on the boiler.

In addition to causing the cold spots, the air, consisting of mainly nitrogen and oxygen, allows radiators to corrode from the inside out. Corrosion causes a build-up of ‘magnetites’ (the black sludge you may have seen when you bleed your radiators) which can restrict water flow, block pipes and over time will damage your boiler and heating pump.

In many modern heating systems the water is also pressurised. As with heating the water, increasing the pressure of the water also reduces its capacity to hold dissolved air, and bubbles of air are created which will impair the performance of a central heating system.

Oxypod™ – problem solved

Water from the heating system enters the Oxypod™. The velocity of water flowing through the Oxypod™ from the inlet to the outlet progressively increases, due to the shape of the chamber, and in particular the shape of the side wall of the Oxypod™. The increase in velocity results in a reduction in the pressure of the water towards the outlet. This reduction in pressure causes the dissolved air in the water to be released, forming bubbles of air. The pressure of water combined with the unique shape of Oxypod™, creates a vortex and the water ‘implodes’ upon itself, stripping the surface tension away from the water. This then releases the air bubbles (nitrogen & oxygen) and the air is directed out of the chamber through the vent at the top of the Oxypod™.

The removal of dissolved air from the water in the heating system significantly improves the overall performance of the whole system, reducing heating bills, cutting noise and extending the life of the boiler, the pump, the radiators and pipes.


"Savings on the energy budget have enabled us to enhance our service."

The premises of Danny's Dream Club, for people with complex needs, has doubled in size but uses less energy than ever, since installing Oxypod™.


21C Eco Energy

Developed by the Goodwin Development Trust to tackle fuel poverty

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