A combination boiler can use one of two different fuels to heat the water. Common combinations include natural gas/propane and oil, or wood and oil combinations.
A condensing boiler uses a secondary heat exchanger to condense water vapour (steam) in the products of combustion down to water. Here's what that means:
When any hydrocarbon (gas, propane, oil, even wood) burns, it gives off at least two "products of combustion. The carbon combines with oxygen to create CO2, carbon dioxide. The hydrogen combines with oxygen to create water vapour, or steam. (If combustion is "incomplete," there will be other trace products as well.)
It's the water vapour or steam we're concerned with here.
To boil 1 pound of water requires 960 BTUs of heat. Conversely, if you condense steam down into 1 pound of water, you will recover 960 BTUs.
The fuel is burned in the "primary heat exchanger," where of course it releases a tremendous amount of heat into the water we're warming up. Then the "products of combustion" are drawn by a fan into the "secondary heat exchanger." When the water vapour or steam component of the products of combustion hits the relatively cool walls of this second heat exchanger, they condense down into liquid water. As they do, they release heat into the boiler water through the walls of the secondary exchanger. The liquid water then goes down a drain.
Obviously, the boiler water has to be cooler than the steam component of the products of combustion in order for the heat to travel into it. So we make sure that this water is what's coming back to the boiler from the heating system. Again, for this method to work well, it's best applied in a "radiant in-floor" type heating system, where we don't heat the boiler water up to as high a temperature in the first place.
--The HVAC Veteran
"Not as difficult as some might think. If it is a home that currently has installed ductwork, the process of the central air conditioning is rather simple. Purchasing the condensing unit is a major expense,"
central freqency of narrow band pass filter is the measure of difference between upper and lower cut off freqency
a dedicated computer control the machine tool in CNC and in DNC a no: of machines are controlled by a central computer.
This is water that has condensed out of the room air on the evaporator coils of the air conditioner, and it is completely normal. If the humidity is high, one will see more water condensing and dripping from the air conditioner than when the room air is dry.
A cord is often the same thing as a cable or a wire, as in power cord - the cable between an electrical appliance and the wall socket. A core is something that inside, either physically in the center (like an apple core), or central in terms of importance, like the core of the emergency services(firefighters, ambulance etc) is a willingness to help people.
difference between central and state university
There is no difference between central and union government
It sometimes depends on the temperature difference between the condensing unit and the air handler. I would say normally no more than an hour.
In a circle what is the difference between a central angle and an arc?Read more: In_a_circle_what_is_the_difference_between_a_central_angle_and_an_arc
there is 1 hour difference between them
The difference between central and junction stations are their locations. A junction station is usually close to a junction station while central stations are not.
There is no time difference.
difference
There is no difference between a central government and a federal government. Both of those types of government do the same thing. The only difference is in the name.
What is the difference between western and central provinces in canada
there is no difference
The Central Plains are a portion of the Great Plains.