The heating system with natural circulation

How does the heating system with natural circulation

heating system with natural circulation of works on the physical principle of fluid expansion during heating.

When the boiler heats the water, it expands at the expense of lower density is displaced upward.The water is then gradually cooling down, the system passes through a circle and returns to the boiler.Water, giving heat to the radiators cools and its density increases again.Next, this cycle is repeated.

Features heating with natural circulation

1. high inertia.From the moment of firing the boiler up and warm all heated premises may take several hours.As the water begins to move slowly through the pipes only after the heat exchanger warms up.
2. that water can circulate freely and independently, all pipe sections are mounted at a slant during the moving of the water.
3. Restricted area of ​​the heated building.Since the pressure difference is small, the water can not effectively move in the tubes of 30 meters radius.

heating system: the principle of

Heating with natural circulation - it is self-regulating system.fluid velocity varies from room temperature.The lower the temperature, the higher the speed.Also, the velocity depends on the boiler position relative to the bottom of the heater.The lower the radiator, the higher the speed.

parameters affecting the rate of coolant

addition to the listed principles that affect the rate of coolant flow, there are others:

1. Material of construction of the pipe.
2. diameter pipes.The smaller inner diameter of the pipe, the more resistance it will provide.Therefore, you should choose a pipe with a large cross section (DN32 -DU40).
3. number of turns and a radius.
4. presence and number of valves.

methods for calculating power: the square

power calculation method is very simple in the area.To determine needs only one parameter - the area of ​​heated space.So on the 10 m2 required 1 kW of power.It is necessary to consider an amendment to the district of residence: for the southern regions - 0.7 - 0.9, for the average country band - 1.2 - 1.3, for the Far North - 1.5-2.0.

This method does not take into account such parameters as ceiling height, the heat leakage through the openings, if the walls are insulated.

By volume, taking into account additional parameters

More accurate results are obtained by the power calculation by volume.

at 1m3 is necessary to take 40 watts of thermal power.And take into account the correction factor to the area of ​​residence (such as in the settlement of the area).Also, to the resulting sum must be added for every 100 watts per standard sized box and 200 watts per door.Depending on the wall thickness and material needed to make a correction of 1.1 to 1.3.And even in private homes to 1.5 non-insulated ceiling and floor.

wiring diagrams of the heating system.Single-tube wiring

This type of wiring is a ring in which coolant moves in a circle.

With this layout fluid can move through two schemes: separate into a liquid that goes into the radiator and down the riser, and not to share, and take place in full through the heat exchangers.The second option is not very handy in practice because there is no possibility to regulate the temperature of rooms using cranes.

order to maintain the same temperature in rooms located on different floors, must be taken into account during assembly that the heating devices on the first floor must be greater than the second and following.

device is a two-pipe system

there are two lines in this embodiment, the wiring: the feed, tapping.In a two-pipe system, heating network elements are connected in parallel.This allows the temperature in each room.

When two pipe system, in contrast to the single pipe (the top), the wiring may have to do a top, with expansion tank at the highest point (attic), and the bottom, placing the hot pipe in the basement.

Conclusions

heating system with natural circulation has several advantages: easy installation, quiet operation, independence from power, long life operation.But there are drawbacks: the limited area of ​​heated space, the slow heating of the house.Before you opt for this system, it is necessary to study carefully the operation and weigh all the pros and cons.