This is what you need to pay attention to first! Circulation pump for heating: how to choose?
An important part of the heating system of a private house is the circulation pump. With the help of this device, connected to the pipeline, uniform distillation of hot water occurs along the heating branches.
The ability of radiators to heat the room depends on the correct choice of circulation pump to the desired temperature.
Content
Types of circulation pumps for heating systems
The pumps are divided into two types, depending on their contact with water. They have their advantages and disadvantages, and are suitable for solving different problems. Before buying a device for a heating system, familiarize yourself with the differences and features of each type.
With dry rotor
An electric motor of this type during operation does not come into direct contact with the coolant, which means it is not in a humid environment.
Sealing is achieved by means of a movable and fixed end seal made made of graphite, ceramic or metallic material.
Devices with a "dry" rotor are not afraid of scale and water with small particles. A powerful pump with Efficiency reaching 80%.
Suitable for rooms with a long heating system. Durable and reliable, but require periodic lubrication. They are not afraid of coolant leakage.
There are the following types:
- Console — the body is mounted independently on the foundation plate. The device has an axial input and a radial output.
- In-line — vertically installed with a linear arrangement of the inlet and outlet pipes.
Important! A pump with a "dry" rotor creates an increased noise level during operation. Not suitable for installation in a small private house.
With wet rotor
The impeller and rotor of this type immersed in the coolant liquid. The electric motor is hermetically sealed in a metal cup. The constant presence of the pump parts in a humid environment promotes their lubrication and protects them from overheating. And also water provides sound insulation, which makes the device quite quiet.
Photo 1. Circulation pump with wet rotor and threaded connection Star-RSD, manufacturer - "Wilo".
They do not require constant maintenance, but they do require a stable amount of coolant. You can adjust the required performance, but Efficiency will not exceed 30%. Suitable for use in private homes with short system lengths.
Characteristics: table
In addition to the rotor type, some technical parameters are taken into account when choosing a circulation pump model.
| Characteristic | Description |
| Performance | Total volume of coolant passed through per hour of work. Closely related to the hydraulic resistance of the pipeline. |
| Pressure | The height to which the pump is capable of raising a column of water. |
| Connecting elements | Depends on diameter of the heating pipe and the length of the housing. |
| Maximum temperature | When in contact with the coolant, the pump must function normally under high temperature conditions. This parameter must be not lower than 110 degrees. WITH. |
| Manufacturer | From the design and quality of the material durability and reliability depend device. It is worth paying attention to the products of already established companies. |
Which pump to install depending on the room's heating needs
Making calculations of heating system parameters characteristics cannot be neglected the room itself. If this factor is underestimated, the resulting temperature can be uncomfortable for living or working.
Recommended standards for the thermal demand of a room depend on the climatic conditions of the country, and in Russia they often differ even in neighboring regions.
Experts calculate the required heating capacity based on the lowest possible temperature during the cold season.
So, in Moscow and the Moscow region for buildings up to two floors, power is needed 173 kW/sq.m, and for three and four-story buildings - 98 kW/sq.m.
For an accurate calculation, the area of the heated room is multiplied by the standard established in the region. The resulting figure must correspond to the technical characteristics specified in the passport.
How to choose the right performance for a private house
The power calculation is based on on two important factors - productivity and pressure. Their ratio is indicated in the technical instructions of the device in the form graphics.
If you need to calculate the speed and performance yourself, use the formula:
G=Q:(1.16xDT).
Q — heat demand of the heated room in watts.
DT — the amount of heat remaining in the room, equal to the difference in temperatures of the coolant in the supply and return. In conventional systems, this figure is 20 degrees C, for low-temperature heating - 10 degrees C, and for “warm floors” it is reduced to 5 degrees C.
1.16 — heat capacity of water. When using other types of heat carrier, specify and substitute the required parameter into the formula.
Productivity is measured in km/h. But in the technical instructions of the device there may be a calculation figure in cubic meters.
In this case, for an accurate calculation, the result obtained after calculation by the formula is divided by the density of the heated coolant. For example, the density of water heated up to 80 degrees C, corresponds 971.1 kg/cubic meter.
How to choose based on pressure calculation
The level to which the pump is capable of lifting water in the system is given in the instructions or directly on the device body. If necessary, this figure is calculated using the following formulas:
H=(FxRxL)/(pxg).
Or (F x R x L)/ 10000(m).
N — the maximum height of the water jet in meters, the pressure itself.
F — the system fittings coefficient, depends on the components, type of main line, presence of valves, mixers, etc.
R — resistance, friction inside the pipeline, calculated in Pascals per linear meter.
p — density of the coolant. For water, this indicator is equal to 1000 kg/m3.
g - the height of a water jet held back by atmospheric pressure. In the absence of hydrostatic pressure, this parameter = 10 m.
When choosing a suitable model, remember that the power calculation is based on the maximum load values.
Therefore, you should not choose a more powerful model, this will increase electricity costs, but will not improve the performance of the system as a whole. Choosing the ideal pump will help schedule, which shows the actual figures for pressure and flow, as well as the parameters of the devices you like.
Choice among the best manufacturers
Available in stores wide selection of brands manufacturers of circulation pumps. It is better to give preference to the most famous of them.
Grundfos
Famous Danish company, existing has been on the market for more than half a century. Circulation pumps from this manufacturer are suitable for heating both private homes and industrial premises.
The range is constantly expanding and improving. Grundfos promises high power of the device with economical energy consumption.
High quality materials guarantee long service life. Minus - high cost.
Wester
Famous British company produces high quality wear-resistant Circulation pumps. Uninterrupted operation and ease of installation are complemented by the virtually silent operation of the electric motor.
Despite their good quality, British-made circulation pumps are cheaper than their European counterparts. Wester specializes in the production three types products:
- Western WPA — pumps capable of increasing the hydraulic pressure in the system.
- Western WCP — “wet” rotor for private houses.
- West WPE — powerful devices for industrial premises.
Photo 2. Circulation pump WSP 25 - 60 G, surface installation method, manufacturer - "Wester".
Wilo
Circulation pumps of this company are distinguished by German quality. The range includes models with a "dry" and "wet" rotor, suitable for any heating needs. Silent, lightweight and quite powerful, they work at temperatures from 120 to -100 degrees C. Manufacturer guarantees eight years of trouble-free operation wet rotor pump.
DAB
Italian company DAB already more than 30 years operates on the Russian market. Produces devices for any type of heating systems.
Control is carried out using a mechanical controller or an electronic relay suitable for energy-efficient heating. There are three operating modes provided for domestic use.
The housings are thermally insulated and can withstand temperatures up to 110 degrees C. Manufacturing company often holds sales, where you can buy a quality pump for little money.
NEOCLIMA
Inexpensive compact circulation pumps are manufactured by company located in China. NEOCLIMA products are suitable for both heating systems and underfloor heating. The cast iron body protects the pump from mechanical damage. Company provides a two-year warranty device services.
Useful video
Watch the video to learn the rules for choosing a circulation pump.
What else to pay attention to when choosing
In addition to the technical characteristics and model brand, pay attention to design details that can make the device easier to use.
Automatic control, connected to the thermostat, allows you to set the speed of liquid circulation and pressure depending on the air temperature on the temperature sensor.
Device with mechanical control It will be cheaper, but you will have to regulate the pump manually.
Built-in pressure relief valve will help to avoid breakdowns in emergency situations.
The correct choice of a good circulation pump determines the functioning of the entire system. A model selected in accordance with all characteristics, will keep your home warm for many years.
