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Heat Exchanger Invention increases boiler efficiency up to 90%

Posted by keelynet on March 8, 2008

The full story relates how a man spent $10,000 a year on propane and saved $2,500 in the first quarter of using this device. Sounds like a winner to me!

heatexchanger.jpg“Named Energycatcher, the invention recycles the heat in a domestic gas boiler’s exhaust fumes and uses it to preheat and store hot water for use in the home. The specially designed heat exchanger reduces the temperature of a modern condensing (Band A) boiler’s outlet flue gases, normally about 60°C, down to lower than 20°C. The manufacturer claims that virtually all the heat is recovered and recycled into the home’s hot water system. The device can be retrofitted to most existing boilers (subject to manufacturer’s approval). The heat exchanger technology is said to make energy savings of up to 90 per cent possible on domestic hot water during winter months and cut overall carbon emissions by 7.5%. The device is also compatible with most solar systems and enhances their effectiveness. The principle of preheating water is as old as leaving a kettle on a warm open stove before boiling it. Modern condensing boilers work well to deliver hot water and central heating to the home, but the outlet exhaust fumes are still hot enough for it to cause water vapour (mistaken by many as smoke) a sure sign of wasted heat. Now, instead of being wasted into the open air, the heat from boiler’s exhaust gas, at a temperature of about 60°C, can flow over the heat exchanger and be transferred to the incoming cold water. The now warmer water moves under convection into a storage tank. The exhaust gases, considerably cooler, then vent to the atmosphere. When the boiler receives a demand for hot water, it draws water from the storage tank and at the same time preheats cold mains inlet water via the exhaust fumes. If the water is hot enough the boiler need not fire or can operate at reduced power. In other scenarios, in which it needs to fire, the increase in temperature required is greatly reduced compared to unadapted systems.” – Source

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