Easy installation and high performance polypropylene pipes in water supply and heating systems - only the upper part of the iceberg. To work correctly mounted communication is not enough to choose the type of polymer pipe and buy stuff in the right quantity - necessary preliminary design sketches, and large objects - severe thermal and hydraulic calculations. To the heating system to be effective, polypropylene pipes for heating You should have a diameter confirmed by these calculations.
We consider in detail the significance of magnitude pipe diameter polypropylene pipes with the device.
Pipe material for communications. On what parameters influence the pipe
Questions should look like water, a pipe diameter must be in the line, served warm heating radiatorsSolved at the design stage of life-support systems in the house. As a result, the diameter polypropylene pipes for water supply can often differ from the identical size pipe heating system, as these communication have different purposes and therefore are exposed to different factors.
The capacity of the heating networks, recommended by experts, professionals should provide speed the coolant at least 0.4-0.6 m / s - depends on the amount of thermal energy supplied for heating residential premises.
On a note: If the pipeline of the heating system boiler feed water velocity less than 0.2 m / s, there is a high probability airing pipe, and excess feed rate of 0.2 m / s will result in increased costs - equipment costs increase following exposure to large loads.
Using polypropylene products greatly simplified work equipment residential hot water heating facilities and water systems. However, it is necessary to know exactly what type of polymer pipe material is suitable in a particular case. Currently existing types of polypropylene pipes have different specifications and are designed for a particular area of use.
The most reliable for mounting pipes and hot water heating system water (DHW) brand products PN25 or PN30. It is these brands can withstand pressures of up to 25 and 30 atm. respectively, at the operating temperature of the coolant 950FROM. It is even transient operation such tubes at a water temperature of 1200C, since the distinctive feature of these articles are thick walls.
Main article about polypropylene tubes.
For cold water used polypropylene tubes with a uniform wall. For hot water heating systems and circuits used reinforced articles have been included in the wall structure of the polypropylene cladding tube made of aluminum or fiberglass significantly increases the strength of tube material and reduces the amount of thermal expansion.
For reference: in reinforced pipes thermal expansion is 0.03 mm / m0C, whereas for the channel with the wall of a homogeneous polypropylene is a value of about 0.15 mm / m0FROM. Accordingly, the cold water supply suitable for homogeneous product, and only reinforced polypropylene is used for heating and hot water systems.
What diameter pipe made of polypropylene materials
When selecting components for the heating device and water are decisive factors fluid temperature, rate of flow and its pressure. The required cross-sectional area water supply is determined by this calculation made in accordance with the scope and conditions of operation of the equipment.
Based on the configuration of the pipe section (circular ring), its geometric parameters are determined outer and inner diameters. Currently existing classification of polypropylene pipes clearly defines the sample sizes for each type of pipe products used for mounting.
As of today, both domestic and foreign manufacturers produce components for pipes as standard. In view of the practical application of the developed standard engineering solutions to determine the optimal passage in products for home heating and other water communications. Based on the data table, you can make the right choice of equipment and components of heating mains without the need for hydraulic calculations.
On a note: should not be regarded as the values shown in the label on the product for setting the internal section. On polypropylene materials usually specified outer diameter.
Typically, the marking is present one of the following values of the outer diameter:
16, 20,25, 32 and 40 mm,
that correspond to the internal diameter polypropylene pipes brand PN25:
10,6; 13,2; 16,6; 21,2; 26.6 mm.
For ease of matching diameters and wall thickness polypropylene pipes used in water supply and heating systems, are summarized in the table:
A reasonable question. Why then on the final products applied outside the parameters, if it is important for the functionality of the size of the internal passage of the pipeline. The thing is that the outer diameter indicates the appropriate type of connection.
The potential use of polypropylene pipes of different external diameters at a rate of coolant flow in a pipe of 0.7 m / s:
- 16 mm diameter pipe is designed to connect one or two heating radiators;
- value of 20 mm corresponds to connection to 5 radiators total capacity of up to 7000 watts);
- for more radiators (total capacity of up to 11 kW) used propylene polymer tube outer diameter of 25 mm;
- polypropylene pipe material having an outer size of 32 mm is designed to house equipment as a whole or a floor heating system 10-12 kW total power (a maximum of 19 kW);
- product 40 mm in diameter are used for the construction of main pipelines in the residential area of large objects. Usually this cottages and country houses, in which the number of heaters up to 20 pcs., And the total capacity of all the connection points is about 30 kilowatts.
Effect of tube diameter on the performance of the heating system
The feed rate of the coolant and the amount of heat transferred depends on the internal cross-section polypropylene pipes. For clarity, this assertion provide thermal energy dependence of the intensity values and the coolant supply pipe diameters tabulated:
Thermal power specified in W, the flow rate of coolant in kg / sec. Analysis calculated based on average temperature values supplied coolant 800C, return 600With air in the room 200FROM..
For example: at a flow rate of 0.4 m / s in the pipeline will be transferred following amount of heat:
- for the backbone with an outer size of 20 (inner section 13.2 mm) Heat quantity is 4.1 kW;
- Ø for propylene product 25 and 16.6, respectively, the amount of heat would be 6.3 kW;
- propylene pipes with outer and inner diameters of 32 and 21.2, respectively, are of the thermal energy supply to 11.5 kW;
- tubular materials 40 millimeters (dimension 26.6 mm internal lumen) provide heat input of 17 kW.
By increasing the fluid flow velocity to 0.7 m / sec intensity will increase the coolant flow directly to 70-80%.
Important! Practical assignment table above - to recommend, based on the value of the required quantity thermal energy required diameter of the pipe during the pipe material selection for the heating system housing.
Consider the obvious example:
There is a typical house useful area of 250 m2. The structure sufficiently insulated and requires heating at the rate of 1 kW to create normal living conditions in the 10 square meters. m, that is, to create a comfortable temperature in the house will be sufficient to 25,000 watts of thermal energy (maximum).
On a note: for the first floor always requires more heat - about 2/3 of the total quantity consumed.
Thus, of the 25 kW heating the first floor requires 15 kW, the second - 10 kW.
The house is equipped with autonomous heating system based on a two-circuit boiler. Installed in rooms radiators are connected in parallel. The house has two wing wiring, with equal heat capacity. The first floor power for each wing is 7500 watts. For the second floor both wings require at 5000 watts.
The boiler provides heating for the house 25 kilowatts of thermal energy. It means for heating main need to use polypropylene tubes and fittings inner diameter of 26.6 mm (at a feed rate of 0.6 m / s). This value corresponds to the outer diameter of tube 40 mm.
To supply the branches on the ground floor will require 1500 watts of heat. Using data from the table, we get the following:
- at a flow rate of 0.6 m / sec optimal diameter of the inner lumen of polypropylene pipes is 21.2 mm - corresponding to this quantity identical outer parameter according to the table is 30 mm;
- each wing is suitable tubular material with an inner diameter of 16.6 mm, which corresponds to 25 mm Ø sectional outer contour polypropylene tubes.
Now consider how to connect the heaters.
water heating radiators have an average power of 2 kW, so theoretically for their tie-in loop suitable pipes with a minimum outer diameter - 16 mm (PN16). However, in practice it is recommended to use a polypropylene product with the size of the internal section of 13.2 mm an outer diameter of 20 mm (PN20), since the use of plastic pipes PN16 deemed impractical because of low processability.
The second floor is equipped with a conduit section of 32 mm. For each of the wing pipes are used and the connecting fittings Ø25 mm. With radiators the same pattern as that on the first floor - the battery connection is made via PN20 pipe.
conclusion
Based on the example above for each segment of the pipeline of the heating system can choose completing the required diameter - including this will depend on the heating efficiency equipment.
It should be remembered that the materials for the pipeline of the heating system are chosen with the expectation maximum conformity specifications Autonomous boiler, despite the fact that in most cases the unit will operate normally - in accordance with the specified parameters operation.
