Ideally, the heating system must ensure uniform heating of the room. However, it happens that, for example, the battery is almost cold kitchen, in the living room - a real sauna.
At the same time fuel boiler operates at full capacity. Fortunately, the installation of the circulation pump has a positive effect on the efficiency of the fuel system.
Next, we will discuss the intricacies of selection of pumps, will understand their varieties and their design features, as well as highlight the advantages and disadvantages of equipment.
The content of the article:
- When you need a circulation pump?
- Appointment of the circulation equipment
- Design and variety pumps
- Rules for the choice of the circulation equipment
- Basic installation nuances
- Advantages and disadvantages of pumps
- Conclusions and useful videos on the topic
When you need a circulation pump?
When problems arise with a uniform distribution of heat in the house, then use one of two options to deal with them: pipe replacement or installation of additional equipment. Balance the heat distribution allow new pipe of larger diameter than were previous.
This variant differs effectiveness and practicality. However, replacement of pipes - is not only long, but also expensive.
The second solution - adding to the circulating pump heating system. It allows you to balance the temperature in rooms throughout the building. It also prevents the occurrence of air bubbles that impede the flow of water. A circulation pump costs several times lower than the fee for pipes, their delivery and assembly.
The device is also characterized by ease of installation. Therefore, the owners of private houses tend to install the pump.
Replacement of pipes - is long and expensive. Installing the circulation pump will save money and time
home heating planning includes not only calculation of the boiler output, The choice of the radiator arrangement, but also the analysis of movement of the coolant. Of course, a large living area - it is an opportunity for a comfortable life is not one person. Instead, coolant circulation speed is reduced. Therefore, the pump is installed, which causes the water to circulate faster.
Appointment of the circulation equipment
In a closed heating system heats the boiler water. However heat transfer agent It circulates through the pipes batteries with low speed, so returning to the boiler, having a low temperature. The heating device operates at full capacity, which reduces its useful life.
Purpose of the circulation pump - to overcome the flow resistance to ensure flow of water in the structurally complex, extensive circuits. Inclusion in the pump circuit will form a uniform heating and acceptable temperature in premises, to allow the boiler to operate at medium power.
Also, in case of use of the pump, there is no need to device conduit slopes towards the boiler and it becomes possible to significantly reduce the diameter of the tubes used in the assembly. The difference between the temperature of the water that enters and exits the boiler, only a few degrees.
Circulation equipment accelerates the coolant in the system. And that high concentrations of air bubbles from appearing, it is necessary to establish air vent or air separator
Design and variety pumps
The circulation pumps are not very complicated structure. Therefore, they just repaired.
Major items of equipment - the housing, an impeller and an electric motor. The blades rotate, which leads to the emergence of centrifugal force. As a consequence, the portions are formed with different levels of pressure.
Water pumps are divided into:
rotor type defines the difference. Sealed casing is ensured by a special metal cup, which is disposed between the stator and the rotor.
Feature "wet" rotor - placement of the impeller and rotor in water. Less noise, but also more modest efficiency index
Accommodation in the rotor coolant medium - a guarantee of constant decrease of the temperature and lubricant components. Also, virtually no audible sound of the pump, as they absorb water. Due to this it is this type of use in private homes.
However, the efficiency of "wet" pump - 50%. This is due to lack of opportunity to seal the rotor with its diameter. Therefore, the equipment is not used when improved performance is needed, for example, at the elongated conduit.
"Dry" rotor noise during operation. Therefore, they are used preferably at a considerable length of heating pipes or industrial facilities
With respect to the "dry" rotor, its working part is not in contact with water. Hit last locked protective rings. This design smaller. A power of 1.5 times - 80%.
The following types of devices with the "dry" rotor:
- Centrifugal who flanged motor. Housing with a special attachment is fixed to a base plate.
- Large centrifugal device with coupling and motor. If they place water inlet and outlet are located on the same axis, they are called pryamopotochnymi.
To choose the best pump, you need to analyze a lot of parameters. The most important of which - the field of use, performance, cost and noise.
Also see a top ten circulating pumps for heating. Read more - go on link.
Rules for the choice of the circulation equipment
The "wet" type of circulation pump differs less noise. The opposite situation with the "dry" rotor. When this noise is formed not only as a result of purely pump, but also the fan, which is responsible for reducing the motor temperature.
"Dry" device is mounted in industrial premises, and "wet" are relevant for premises. After all, the noise level exceeds 70 dB, will have a negative impact on the psychological state of living in the house.
In the arrangement of private houses in the priority of "wet" version of the pump. Its blades are constantly in the pumped liquid, the items will be lubricated with water and will last for 5 years or more.
When the instrument is switched to an open heating circuit should pay close attention to the quality of the coolant, it is not necessary to fill it with water and the presence of mineral and organic impurities.
The variant with "wet" rotor is worth less than the equivalent, with a "dry". It should stay on the ground, if the heating system does not require high power
Another criterion - indicator of pressure. Thus, if it is within 10 meters, then suitable "wet" rotor for optimum operation of the closed system. Enough power to 25-30 m3 in hour.
When the heating system requires more pressure, then the best option - pump "dry" rotor. In its structure the rotor is separated from the heating duct gland. This variation would consume less power than equivalent, with a "wet" with the same efficiency.
Learn the necessary power of the pump will help the following formula:
Q = 0,86 * P / dt
Q - pump capacity, m3/час;
P - thermal capacity of the heating system kilowatts;
dt - the difference between water temperature before entering the heating device and then exit.
Here is a specific example. Let the area of a dwelling house - 200 m2. Let's pretend that two-pipe heating system. To maintain the optimum temperature in winter, a sufficient thermal capacity of 20 kilowatts.
Default dt - 20 degrees Celsius. This figure is sufficient for approximate calculations at home.
The result is 0.86 m3 / h. We can be rounded to 0.9. Still better to be safe from error. And over time, the circulation pump is worn, so the power will be less.
Another option is the equipment - the pressure. Each hydraulic system has a resistance to water flow. This characteristic and necessitates the use of the device for circulating coolant in the system.
Pump parameters must prevent resistance heating system and provide the desired efficiency
To get the exact value of the hydraulic resistance index, the calculations are carried out according to the following formula:
H = N * K
N - number of floors of the building (basement counts as floor);
K - the average hydraulic costs based on one floor of the house.
K varies within the range 0.7-1.1 meters water column for a two-pipe heating systems. A collector for cathode ray its value is in the range 1,16-1,85.
For example, two-story house with a basement has three levels. If the calculations are performed by lay, then it is possible to take the maximum value of the ranges specified above. For two-pipe system is 1.1 meters. That is, K is calculated as 3 * 1.1 3.3 m and obtain a water column.
The three-storey house of the total height of the heating system is 8 meters. However, according to the formula we have received only 3.3 meters of water. This value will be enough, because the pump is not responsible for the raising of the water, but only for reducing the negative effects of resistance of the system.
Basic installation nuances
First portion to be determined for the pump in the heating network. It is important that in this place was convenient to make repairs or to replace the device, if the need arises.
Previously, "wet" pumps mounted on the return pipe, through which circulates the water has cooled down significantly. This approach, according to authoritative experts in the field of heating, prolongs the service seals, bearings and rotors.
However, components of modern pumps consist of materials which are not afraid of exposure to hot water. Therefore, the device can be set as the conveying cooled water to the boiler tube and the carrier already heated.
If you install a circulation pump for hot water supply line, the "warm floor" is really warm. This will provide the maximum level of efficiency
To normalize the pressure pump should be installed in the pipeline section that supplies water to the boiler. Such a zone is located near the entrance of water in place of expansion tank. As a result, it is able to obtain high temperature at the site of the heating system.
There are simple rules, implementation of which will allow to establish a circulation equipment correctly:
- below and above along the tube disposed about the pump Ball Valves. The latter allows to suspend the supply of water, to repair or replace the device;
- before the pump set filter which prevents dirt from entering the device and other mechanical stimuli;
- on top of the bypass air valve is mounted. He prevents the formation of air pockets;
- applied on the pump housing arrow. It indicates how the relative water flow direction, the pump must be placed;
- "Wet pump" is set in a horizontal position. If the motor is not completely in the water, then the device will fail quickly;
- the terminal device is directed upward;
- all connections to protect the sealant and gaskets;
- used earthed socket for security.
Following these simple guidelines will maximize correctly put the circulating pump in the system. In the future, work will bring its owner exclusive comfort.
It is important to remember one particular equipment with manual control - to release the air before each switching on the pump need to open the air valve for 5 minutes.
In the final result, we obtain a standard scheme. It is important to follow all the rules for the installation of the pump in order to avoid trouble in the future
So far, the fuel system is not filled with water, and the air is released to include the pump is prohibited. Otherwise, the apparatus may burn out. But the pump with automatic control deflates without human intervention.
The sequence of installation of the circulation pump in the heating system is as follows:
- If the heating system is already in use, you need to drain the water several times. So get rid of the mechanical stimuli.
- Install bypass. Below and above the pump is mounted special cranes that inhibit the water in case of breakage of the pump and allow to replace the device.
- Mounted filter.
- Install a bypass pipe line.
- Mount valves for preventing the free flow of water in the system.
- Put expansion tank (useful for open systems).
- Install pump in accordance with the instructions and installation regulations. Mounted horizontally, as in the vertical position it will lose a third of the performance and quickly fail.
- Treat place sealant compounds that have a positive impact on the efficiency and duration of pump operation.
- Fill the fuel system with water.
The optimum amount is determined circulators pipe length. For example, if the total pipe length up to 80 m, whereas only one device with the average power.
Although, it is better to put one for continuous operation, and the second to establish a "reserve". This will allow in case of breakage of the main operating unit without delay launch the coolant circulates through the system.
In the case of elongation of the pipeline of the heating system by a distance greater than 80 m is required circulation device 3-4 or more.
In order to simplify the procedure for installing fasteners and connections, it is better to get the circulation pump with already selected connectors
You can order and professional installation. Cost of services professionals determine the prevalence of the model, the complexity of the bypass pipe and the number of pipeline loops.
For detailed instructions on how to install the circulating pump in the heating system can be read here.
Advantages and disadvantages of pumps
Many consumers focuses solely on the strengths of the circulating pump. Undoubtedly, this equipment brings great benefit to the home owner.
Its main advantages are the following:
- simplicity - the device no special requirements to the heating system. Different varieties of devices provide heating circuit forming the desired length.
- Optimum coolant velocity. The equipment forms a pressure drop and provides better motion aqueous stream.
- speed - operative inclusion heating system. Batteries in minutes filled with warm water.
- Convenience. Pumps are easy to install, maintenance and replacement.
- High efficiency. To provide a comfortable temperature, sufficiently low power.
Circulating pumps not only increase the efficiency of the heating system. They also are easy installation and maintenance. Well as equipment, if properly installed, will last far more than one year.
But, unfortunately, it has several drawbacks. The main disadvantages of heating systems with pumps as follows:
- The increase in energy costs. The more powerful the instrument, the greater the amount in the account.
- The dependence of the device from power.
- Additional expenses. Place the pump is not possible without the acquisition of related parts.
- installation costs. If the heating system is working, can not do without a specialist who will connect the pump in accordance with the technical requirements.
To reduce the dependence of the electrical energy can be purchased diesel generator specially designed for the specific pump group.
Or mount the device with a slope, so that the system for a short period of working on the basis of natural circulation.
Disadvantages circulation of equipment for heating systems pale in comparison to the benefits
Pluses circulator appear more significant than its shortcomings. The use of the device significantly increases the efficiency of the fuel system. Most of the shortcomings of the unit deal with additional one-time or recurring costs.
Conclusions and useful videos on the topic
Rules about the device and installation of the pump in the video clip:
Features installation of equipment circulating in the heating system are shown in the video:
After reviewing the principle of operation of the circulation equipment, with the main differences of the dry, wet type, it is possible to choose the most acceptable option for their heating system. You can set the pump on its own if you wish. To do this, follow the rules and useful tips for installation of the circulation equipment.
Do you have personal experience of the installation of such equipment? Please share them with our readers. Tell us about the nuances of the installation which are known to you. Leave your comments, ask questions, share experiences in the comments section.