The heating system can be with natural and forced circulation. The second type is different in that to ensure the movement of hot water through the pipes, it is additionally necessary to install a pump. It helps the coolant move at a certain speed throughout the system. You need to know how to choose a circulation pump in order to provide heat in the house and not face problems in the process of heating the home.
Circular pump functions
Its basic goal is to achieve a high speed of movement of the coolant (water) through the pipes. Systems with forced circulation can only reach their capacity under such conditions. When the process of moving water begins, the pressure in the pipes increases, which is provided by booster pumps.
Knowing how to choose a circulation pump for heating, everyone can install a good system in the house that will provide the room with the necessary amount of heat for a long time.
Dry units
There are only two types of circulation pumps - with a wet and dry rotor. They pursue the same goals - to drive water through pipes, but the appearance of the units has significant differences.
The name of the dry rotor pump reflects the essence of its design. It differs in that only the impeller (pump part) is placed in the coolant, and the rotor is located in a special protected housing. The liquid is not able to get to it, as it is protected by a whole system of sealing rings. Only the impeller of the circulation pump is in the water.
Benefits
Having learned about the basic properties of the unit, each person will not worry about how to choose a circulation pump, as he will understand their features.
The primary advantages of a dry rotor pump are as follows:
- The device is very useful, has high efficiency.
- The period of use is quite long (about 3 years, but may be longer).
- Heats large rooms well.
However, the unit makes significant noise, which prevents its installation in private homes. Also, such a pump must always be kept in good condition, monitor the work, because sometimes the solid particles that are in the coolant enter the area of \u200b\u200bthe sealing rings. As a result, the complete protection of the case is violated. This can lead to breakdowns and severe heating of the system. interested,how to choose a circulation pump for a heating system, you must study a different type of unit. It becomes clear that a dry rotor pump is not suitable for equipping private houses. It will be the best option for factory premises as it saves energy.
Glandless pump
The name of this pump also speaks of its design features. In it, both the impeller and the rotor are located in the water. All electrical parts and the starter are in a special protected glass.
Quite an easy-to-use system. Therefore, it is not difficult to answer the question of how to choose a circulation pump. It is enough just to study the properties of the aggregate in question well.
Dignity
This type of pump has its own distinctive features:
- Its efficiency is regarded much lower than that of a dry rotor. It is 50%. Energy cost will be slightly higher.
- Does not require additional maintenance.
- The use period above is 5-10 years. The term directly depends on the chosen brand.
- Noises are almost inaudible, it works calmly and quietly.
Having studied the properties of both types of units, everyone will know how to choose the right circulation pump for their home. Installing the type of circulation pump in question (wet) in the house will create a comfortable atmosphere of silence, as well as provide the necessary heat. Many systems are able to supply exactly the amount of heat that is needed in a given period of time. Therefore, low efficiency is not a significant disadvantage.
Selection rules
In many enterprises, managers seek to install a circulation pump. It is also the right decision for owners of large private houses. But how to choose the right circulation pump for heating?
First you need to study the main specifications. They are different for each type of unit.
It is possible to independently calculate the technical characteristics only in a house or apartment. In large factories, you have to attract specialists. Sometimes, for additional information, you will have to contact the manufacturer, who knows all the measurements and specifications.
First, it is very important to figure out how to choose the pressure of the circulation pump?
If the pump is needed for the home, then the average characteristics are quite suitable. They mean that the performance of the unit should be directly proportional to the power of the boiler. It is also important to take into account the head, which has an average velocity of 0.6 m for 10 meters of pipeline.
To find the pressure value, use the usual formula: the total length of the entire system is multiplied by 0.6 and multiplied by 10.
It is also important to know what speed to choose in the boiler circulation pump. Units with any value of this value that do not cross the border of 1.6 m / s are suitable. As a rule, higher values lead to a quick breakdown of the unit, as well as to its strong heating.
If tothe question of how to choose a circulation pump, approach responsibly, it is important to give preference to systems where it is possible to change the speed of the coolant. This property helps the system to change indicators depending on the temperature outside. Multi-speed models are the best solution.
For pipes with a small diameter, it is necessary to select the most powerful pump, as this will save you from unwanted breakdowns and overheating. For wide pipes, the need for a very powerful system is eliminated. Given this rule, everyone will know how to choose the power of the circulation pump.
Heated floor
A circulation pump is also used for the construction of underfloor heating. It can also be useful for radiator heating systems that are used in private homes.
How to choose a circulation pump for underfloor heating?
It is important to understand that these systems are characterized by low power, as well as low pressure and fluid flow. The energy consumed by the device is also small, and the noise during operation of the unit is not audible.
Any circulation pumps required for floor heating have a special digital mark. The first number indicates the connection thread diameter in millimeters or inches. The second designation is the pressure characteristic. The higher it is, the greater the power of the system.
As for the choice, you must initially know the brand and characteristics of the pump, all this should be indicated in the project for underfloor heating.
You can alsopurchase a system with average performance (25/40 - 25/60). This is the best option for apartments and houses. If the area of the room is large, then it is possible to install several nodes. In principle, there is no alternative.
The radiator heating system is designed much simpler, so it is easier to choose the right unit for it. How to choose a circulation pump for such a heating system? For small areas, an option with indicators of 25/40 is suitable. If the area of \u200b\u200bthe apartment is large, you can already use pumps with indicators of 25/60. As the area increases, it is necessary to select a more powerful pump.
You can purchase a very powerful pump for a small room. He will work well in it too. However, there is no point in such a mechanism, as it will cause a large waste of electricity.
For efficient underfloor heating, it is important to use circulating pumps with sufficient capacity so that there is not much difference between supply and processing temperatures.
DHW
For DHW heating, the usual centrifugal water pump will not be a suitable option. The fact is that the system does not provide for high water temperatures.
That's why you need a pump that is equipped with special materials that can withstand temperature fluctuations. The unit must operate quietly. Increased noise causes discomfort, and this is not very good. Also, the pump should not be very large and consume not very much electricity.
Mechanisms,used for the heating system are very different from those suitable for domestic hot water. This applies not only to external characteristics, but also to operational ones. It is necessary to constantly monitor that the DHW pump does not heat up too much. To prevent this from happening, it is important to select a unit that meets all the characteristics.
How to choose a circulation pump for domestic hot water?
When choosing among multiple options, preference should be given to mechanisms with suitable performance. This value is the volume of liquid that is pumped by the pump per unit of time.
It is also important to consider pressure indicators. It is important that it does not exceed the allowable limits. Power is not the last thing they pay attention to when choosing. The system control options are also being evaluated (using a timer or a sensor that responds to temperature changes).
Strongly high performance or system power does not make sense, since a rather small volume of water is pumped in the system for heating a residential building. This is done at low speed. The approximate performance required to maintain the temperature in houses or apartments is 0.2-0.6 cubic meters per hour.
Electricity of circulation pumps is consumed in small quantities, which is very economical. This happens because the power is only 5-20 watts, that is, a relatively small value. This indicator is quite enough so that the pump can always effectively distill the liquid through the pipes in the room.
Head of fluid flow is importantcharacteristic when choosing a unit. The system will be able to provide heat supply both in a large house and in a small residential building.
To evaluate the pressure of the liquid flow and choose a good unit for hot water supply, you must consider:
- The position of the pipes through which water circulates. They should be about the same height. Then you can install pumps with a pressure of 0.5 - 0.8 meters of water column.
- Possible position of the pipeline at several levels, which is typical for houses with several floors. This is important to consider because the liquid must rise to a certain height through the pipes.
Advantages of the circulation pump
The main feature of the circulation unit is its efficiency. Also, the equipment is quite durable, has a small volume, is able to work without creating unnecessary noise. Knowing how to choose a circulation pump, each person will be able to have high-quality heating in their home.
These advantages are far from being the main ones, as there are a number of other advantages of the circulation system:
- The device is able to distribute heat throughout the room evenly, so all rooms are heated very well, there can be no temperature fluctuations in the presence of a circulation unit.
- It is possible to customize and adjust this system.
- The pump runs smoothly, performs all prescribed actions in the prescribed manner.
- Energy saving sometimesreaches 50%, since in many systems of the circulating type there is a setting for its consumption.
- When installing pumps without automatic mode, it is also possible to control the room temperature.
- Circulation units easily cope with both water and ethylene glycol, the temperature can vary from +2 to +130 degrees.
- Efficiency reaches high levels, and silence ensures a comfortable stay in the room. These figures may vary depending on the option - dry or wet type of circulation pump.
- Provides the constant head required for this system. All equipment associated with the system works without failure due to this.
- Good coolant circulation even in a two-story house.
- Long life use. If the pump is chosen correctly, it will serve for a long time without the need for repair. In the event of a breakdown, repairing the equipment is not a problem, as everything is designed simply.
- Circulation pumps are versatile, as they are suitable for the vast majority of heat supply systems.
- The circulation pump ensures productive work, good functioning of hidden heating systems.
Cautions
It is important to understand that all the characteristics presented above are statistical averages. You can choose the right circulation pump for the boiler, if you focus on the area of \u200b\u200bthe house and power,generated by the unit. If there is no knowledge in this matter, it is better to consult a specialist and entrust him with this work.
