How furnaces for a bath work?to choose what furnace to choose, are necessary:
1. To solve what we want from it;
2. To understand how it works.
Any furnace for a bath consists of a fire chamber, the device for selection of heat (flue) and a pipe.
The fire chamber is, certainly, furnace heart for a bath. It represents a chamber where fuel burns down. The bottom of this chamber (under) has the opening closed by rods - grid-irons (usually from cast iron). Grid-irons rather of a crack (or gleams) between them, are necessary in order that:
• fresh air could arrive to the place of burning;
• ashes could be poured from a fire chamber down.
For loading of firewood, coal or other fuel the furnace door serves in a lobby or a sidewall of the furnace for a bath. Close the volume of a fire chamber of a wall and the arch.
The chamber under a fire chamber is called blew. It is necessary for a podduv of air in a fire chamber. Still, blew serves as an ashpit. The ashes which are formed when burning fuel through grid-irons get on a bottom blew from where it can be removed through a podduvalny door.
As it was already told, draft, that is continuous inflow of fresh air and outflow of a smoke is necessary for burning of fuel. This movement is provided that hot air, as we know, easier cold and therefore itself rises up.
Self-draft is a remarkable property of the furnace for a bath. It does not need the pump or the fan to give oxygen (air) to a burning zone and to delete a smoke and gaseous products of combustion of fuel.
Draft is provided with height, pipes: the pipe is higher, the draft is stronger. Why so it turns out? Imagine that instead of a door blew the flexible film is established. From within on it presses a column of hot air, height to the top cut of a pipe. Density of air depends on temperature, at the room temperature the cubic meter of air weighs 1,2 kg. From a burning zone to an exit from a pipe temperature falls from 600 to 110-120 °C. It is possible to take the average temperature of hot air for 140 °C, its cubic meter weighs about 1,1 kg (actually - even less).
We will accept for simplicity that the internal volume of a chimney and the furnace for a bath is equal to one cubic meter. Then on our flexible partition presses hot air with a force of 1,1 kg from within, and outside - cold with a force of 1,2 kg. The difference makes 0,1 kg. It is also that pressure which drives from the room air to the furnace and provides self-draft.
At combustion of 1 kg of fuel the real furnace for a bath consumes up to 10 m3 of air that, by the way, provides to a bath excellent ventilation of the room. It is necessary to remember that usually the furnace for a bath is designed so that at its warming up and establishment of an operating mode the best parameters were provided: good draft, full combustion of fuel, economic operation of the furnace (effective use of heat).
The main technical characteristics of the furnace for a bath
the Thermolysis, or, simply telling, furnace power for a bath, - that is how many thermal energy from a pro-fire chamber to a pro-fire chamber emits the furnace hourly. Generally - there is so much how many burned down fuels. Ordinary not really big furnace for a bath has power to 3 kw (it approximately corresponds to the power of two rings of the gas stove in your city apartment).
It is clear, that the amount of heat which gives the furnace for a bath has to surpass thermal losses of the room. As to define them, we will tell below.
A thermal capacity, in other words - as long the furnace stores warmly burned down fuel (the thermal capacity of the furnace is measured in hours). It would seem - the longer, the better. But the more a furnace thermal capacity for a bath, the more its sizes.
Mass of the furnace. It is important parameter too. The easiest furnaces for a bath - manufacturing. They can be put on a floor, without the base.
Brick furnaces for a bath can be put on a floor without the base too - the easiest, in a quarter of a brick, i.e. their walls give all the best the brick put on an edge (in this case the metal framework or a casing is necessary for durability).
Heavier furnaces demand the device of own base. This base should not be connected with the base of the house!
If the chimney not mounted, and costs separately from the furnace (a radical pipe), it has to have the base too.