high efficiency condensing boiler

leo_2

Hello,

I am a student at UIC. Do you know where I can find some information regarding high efficiency condensing boiler ?

Sincerely yours

Leo

Uni R

high efficiency condensing boiler info

www.google.com

www.viessmann.de

http://www.aboutopus.com/howg1works.cfm



What kind of information are you looking for exactly?

leo_2

Thank you for your input.
The information I am looking for are:
What is the condensing boiler¡¯s principle? Or what is the definition for condensing boiler? When I asked around people keep talking about boiler condensing. I am confused.

leo

Uni R

high efficiency condensing boiler

A condensing boiler is one that is designed to run with it's exhaust gas temperature below the dew point. The condendate falls out and needs to be dealt with in such a way that it doesn't corrode anything in the boiler. The condensate is very acidic (low PH). While nearly any boiler can be made to condense, if it can't deal with the condensate it will not last long.

The advantage of having a boiler condense is that you are maximizing the amount of heat (BTUs) you can extract from the fuel you are burning.

leo_2

Could you please recommend some web page for me? That way I can do some homework before ask any silly questions?

Leo

Aidan

Try

The article at;
http://www.diyfaq.org.uk/plumbing/plumbingpage1.html#condensing

The fossil fuels (gas, oil, coal) are mostly hydrocarbons, compounds of hydrogen & carbon. If you burn these you mostly get the oxides, i.e., CO2, some CO, H2O,i.e., carbon dioxide, water & some carbon monoxide.

The water is a vapour if it's discharged at anything above 60degC. If you discharge the flue gases at a lower temperature, the vapour condenses & you get liquid water. You can then use the energy involved in changing the water into a vapour, the latent heat of vapourisation.

However, there are traces of other elements in fuels, including sulphur. This comes out the flue as sulphur di-oxide. It will dissolve in the water, making sulphurous acid (I think that's how it goes). This acid will rot through the back-end of a conventional boiler operating at too low a return temperature. A condensing boiler can tolerate the acidic condensate.

For the same reason, if you only use a car for short journeys, you'll rust through the exhauist fairly quickly. The water vapour condenses in the exhaust until it gets hot and it never gets hot if only used for short journeys.

john wood_2

Latent heat of vapor!

The condensing boilers recover the 970BTU per pound that other boilers allow to escape as steam. The steam, or water vapor is a normal byproduct of combustion. When the vapor condenses, it releases its heat into whatever medium it condenses on. If in a boilers heat exchanger, then into the fluid therin! If in the atmosphere, then into the air. This help?

Uni R

Leo

www.google.com is a great place to look and it is better for you to learn how to research that have others do it for you.


Search on the specific words you were asking about. Also try the "groups" section of google. The amount of information on the web is vast. We are the first generation ever that can get answers to almost any question and never get off our butt. ;-)