How to choose a circulation pump for heating table

An effective heating system is essential for keeping your house warm and comfortable during the winter. The circulation pump is one crucial part of this kind of system. This little but powerful gadget is essential to ensuring that hot water from your boiler flows efficiently through your heating system and heats your entire home evenly.

It can be difficult to select the best circulation pump for your heating system, though. There are many options on the market, and each one has unique features and specifications, so it’s critical to know what to look for when choosing the right one for your house.

The first thing you should do is evaluate the size and design of your house. The flow rate and head pressure requirements of the circulation pump will depend on the size of your property and the number of heating zones you have. In order to ensure optimal performance, a larger home with multiple floors and heating zones will usually need a pump with higher flow rates and greater head pressure capabilities.

Next, think about the kind of heating system you currently own. The kind of circulation pump you require will depend on whether your system is a modern radiant floor heating system or a conventional boiler-based system. The flow and pressure requirements of various systems vary, so it’s critical to select a pump that works with your particular configuration.

Energy efficiency is a crucial consideration as well. In the long term, purchasing a high-efficiency circulation pump can reduce your energy expenses. Seek for pumps bearing high-efficiency ratings or ENERGY STAR certification; these models are built to use as little energy as possible while still providing dependable performance.

Finally, when comparing various circulation pump options, don’t forget to take into account aspects like warranty coverage, ease of installation and maintenance, and noise level. Choosing a pump that has a strong warranty, is easy to install and maintain, and operates quietly will help guarantee hassle-free operation for many years to come.

You can choose a circulation pump that is ideal for your house by considering these aspects and carefully assessing your unique heating requirements. This will help you stay warm and cozy during the winter while also saving energy and money.

How to choose a pump for a heating system: a simplified calculation scheme

An essential step in the design process is choosing the pump for the heating system, which will lead to the identification of the aggregate with the best qualities. We will examine how to select a heating pump and discuss the key factors and techniques involved in this process.

Different sized circulation heating pumps are shown in the picture.

Choosing the right circulation pump for your heating system is crucial for efficiency and comfort in your home. A circulation pump plays a key role in moving hot water through your heating system, ensuring that every room gets properly warmed up. When selecting a pump, consider factors like the size of your home, the type of heating system you have, and the energy efficiency of the pump. Look for models with adjustable speed settings to match the needs of your system, as well as those with reliable construction and good warranty coverage. Additionally, pay attention to the pump"s power consumption and noise level to ensure it fits your requirements. By making an informed choice, you can enhance the performance of your heating system while minimizing energy costs and environmental impact.

Calculation of parameters

Main characteristics

Pump for circulation in a pipe for heating.

The primary distinction between the various heating schemes is how the coolant is transferred from the boiler to the radiators.

There are primarily two methods:

  1. Natural circulation. Occurs under the influence of gravity due to differences in the density of hot and cold water. Since the efficiency of heating depends on the consumption of hot water, the speed of natural circulation in the heating system of the house is most often not enough;
  2. Forced circulation. It is carried out by installing a special unit on the pipeline, which pumps the coolant with the desired speed and pressure. Most modern heating schemes are arranged on the principle of forced circulation.

The primary methods for allocating heating work.

Crucial! should not be mistaken for a centralized supply system with natural circulation: special equipment pumps out the high pressure coolant that enters city apartments.

For the plan to function properly, all of its parameters must be calculated. These parameters determine how the pipeline sections, radiator capacities, boiler capacity and power, and circulation pump heating pump performance are to be carried out. The hydraulic characteristic is one of these variables:

The hydraulic resistance’s relationship to coolant intensity is depicted on the graph.

The graph shows that the resistance is directly correlated with the coolant flow rate, meaning that the more quickly the water flows along the contour, the more resistance it encounters. Consequently, the pressure is increasing.

Now think about the circulation device’s pressure-proceeding:

The manufacturer’s specified pressure-cost characteristic is the basis for choosing a heating pump.

This graph shows how the intensity of the pump supply affects the pressure loss. Here, we see the opposite dependence: the losses are greatest when the engine is off, and they decrease as the engine speed rises.

The following image is what we will obtain when we merge these two graphs:

Its working point determines the choice of pump for a heating system.

Crucial! The working point enables us to calculate the resistance in the pipes at the coolant consumption (or supply) maximum. This means that while our gadget needs to be powerful enough to overcome the associated hydraulic resistance, it also needs to function well enough to deliver the necessary feed.

Calculation of performance

The heating circuit’s pomp.

We will use a simplified scheme for the calculation because it will be challenging to create a graph of the hydraulic characteristics of the heating contour. Therefore, we must ascertain the hydraulic resistance and maximum consumption (performance). Let’s begin with the show.

The dependence represents the thermal energy used by the heating circuit:

The thermal energy formula.

The following values were used in the formula:

  • W is the thermal energy necessary for heating our premises in watts (thermal power of the circuit);
  • C – heat capacity of the coolant, W/liter* ° C;
  • Q – the flow rate of the coolant, m3/hour;
  • T1 and T2 – the temperature of the supplied and discharged coolant, respectively.

Performance plays a key role in the heating pump selection process. We will convert our formula to find the flow rate because the productivity of the device should match the coolant’s maximum flow rate:

The following table can be used to determine W’s energy content:

Power table for thermal heating.

Assuming that the water has a heat capacity of 1.163 W/liter*°C, the temperature differential between the supply and reverse flows is 20 °C (per SNiP). From this, we’ll obtain:

W/1.163*20 = 0.043*W is Q.

Crucial! This means that if we multiply 10,000 by 0.043 to find the coolant flow rate for a room with a heating capacity of 10 kW, the result is 430 liters per hour.

Calculation of hydraulic resistance

Determining the hydraulic resistance is necessary before selecting heating pumps.

Calculating the hydraulic resistance of the heating circuit in a professional and accurate manner is a challenging task that calls for specialized knowledge and abilities. We’ll employ a condensed method that states that the circulation pump’s pressure will equal:

  • H – the height of the water column in meters;
  • N is the number of floors in the building, including basement floors;
  • k is a coefficient equal to the amount of averaged hydraulic losses per floor of a building or structure. SNiP accept this coefficient equal to 0.7 – 1.1 m for two -pipe schemes and 1.16 – 1.85 m for collector-ray schemes for the organization organization.

The radiator supply circuit has two pipes.

Crucial! It turns out that the engine needs to supply a pressure of 3*1.1 = 3.3 meters if we have a two-story home with a basement that is outfitted with a two-pipe heating pipeline.

The choice of the pump

Once you are aware of the key features, you can select a specific unit.

Thus, resistance and performance are our two values. Now let’s return to our pressure-cost characteristic graphics.

Put the flow value on the x-axis and the resistance value on the y-axis. Next, we choose the unit whose pressure-free dependence schedule is situated close to this point:

It is imperative that we select a device whose operating point is situated as near to the previously marked point as feasible.

Crucial! Generally speaking, the graph shows three lines representing the various motor operation modes. is best directed by the second speed, and since it corresponds to the greatest efficiency, the working point should be situated in the middle third of the diagram.

The diameter of the pipeline and the pump must match.

Naturally, it’s important to choose a device that can withstand medium temperatures between 95 and 110 °C and to be aware of the pipe’s diameter before cutting the device. The manufacturer and quality will determine the device’s price.

Based on computations, the appropriate circulation pump for the heating circuit is chosen. Watch the video in the article if you find the material presented to be too complex.

A person who has already planted a tree and raised a son may occasionally be asked, "How do I choose a circulation pump for the built-in house’s heating system?" Additionally, a lot depends on the response to this query, including whether or not all radiators will be warmed up and whether or not the coolant flow rate in

The heating system is adequate while not going overboard. Other concerns include whether the pump will use too much electricity, whether the hum in the pipelines will stop, whether the thermostatic valves in the heating devices will function properly, and so on. Ultimately, the pump serves as the central component of the heating system, continuously agitating the coolant, which is the house’s lifeblood that provides warmth.

Select a circulation pump for the small building’s heating system, verify that the pump chosen by the store’s salespeople is the right one, or confirm that using the enlarged calculation method will make choosing the pump for the existing heating system very easy. Performance is the primary factor in choosing a circulation pump; it should match the thermal power of the heating system it serves.

Essential The circulation pump’s functionality A straightforward formula can be used to calculate with enough accuracy:

Where DT temperature delta is the temperature differential between the supply and reverse pipelines, p is the system’s thermal power in kilowatts, and Q is the required productivity of the pump in cubic meters per hour. Generally acknowledged to be 20 degrees.

So, we try. Take, for example, a house with a total area of 200 square meters, the house has a basement, 1st floor and attic. The heating system is two -pipe. The necessary thermal power required for heating such a house will take 20 kilowatts. We produce simple calculations, we get – 0.86 cubic meters per hour. We round, and accept the performance of the required circulation pump – 0.9 cubic meters per hour. Remember it and move on. The second most important characteristic of the circulation pump is the pressure. Each hydraulic system has the resistance of water flow passed through it. Each angle, a tee, a reducing transition, each rise – all these are local hydraulic resistances, the sum of which is the hydraulic resistance of the heating system. The circulation pump should overcome this resistance, while maintaining the estimated performance.

Hydraulic resistance calculation is a complex process that needs some advance planning. To roughly determine the required The circulation pump’s pressure The following formula is applied:

Where k is the average hydraulic loss per floor of the building and n is the total number of floors, including the basement. For two-pipe heating systems, the coefficient K is taken at 0.7–1.1 meters of a water column; for collector-ray systems, it is 1.16–1.85. Our home has a two-pipe heating system and three levels. We use K.V. With, a coefficient of 1.1 m. We estimate that the water column is 3.3 meters (3 x 1.1).

Pay attention – the total physical height of the heating system, from the lower to the upper point, is about 8 meters in such a house, and the pressure of the required circulation pump is only 3.3 meters. Each heating system is equilibrium, the pump does not need to lift water, it only overcomes the resistance of the system, so there is no sense to get involved. So, we got two parameters of the circulation pump, performance Q, M/H = 0.9 and pressure, H, M = 3.3. The point of intersection of lines from these values, on the graphics of the hydraulic curve of the circulation pump, is Working point the necessary circulation pump.

Let’s say you choose to focus on excellent DAB pumps. Excellent quality Italian pumps at a very reasonable price. Utilizing the catalog or our company’s managers, identify the pump group whose parameters include the required operating point. We choose to designate this group as the VA group. Select the hydraulic curve schedule that works best for you; the pump curve works best. VA 55/180 x.

The middle third of the graphic should contain the pump point since this is the area where the pump operates at its most efficient. Choose a graph representing the second speed for the selection. By doing so, you protect yourself against the enlarged calculation’s lack of accuracy because you will have a buffer to boost output at the third speed and the ability to lower it at the first.

Bingo! The circulation pump is selected!

Calculation and selection of circulation pump

  1. Types of circulation pumps
  2. Recommendations for installing pumps
  3. Recommendations for the selection of a pump
  4. Calculation of the performance of the circulation pump
  5. Calculation of hydraulic resistance
  6. Video: calculation of the required pressure and volumetric feed

The majority of residential heating systems use combined or forced water circulation. A circulation pump is a crucial component of this type of system, as it guarantees the flow of water through pipes and radiators. Her work will be most effective if she performs the accurate calculation and selects the appropriate circulation pump for the heating system.

Types of circulation pumps

A typical circulation pump’s design includes a ceramic rotor, a stainless steel case, and a shaft with a bladed wheel. An electric motor is used to drive the rotor. A comparable design allows water to be stamped on one side of the apparatus and then injected into pipelines via the exit. Water flows through the system as a result of centrifugal force. As a result, the resistance that develops in some heating pipe areas is removed.

There are two categories for these devices: dry and wet. The rotor and pumped water do not come into contact in the first instance. The electric motor’s working surface is fully polished, fitted together, and divided by unique protective rings. Although dry type pumps are thought to operate more effectively, they make a fair amount of noise when they’re working. For their installation, distinct, isolated rooms are furnished accordingly.

Consideration should be given to the existence of air turbulence generated during operation when selecting such models. They cause dust to rise into the air, which makes it easy for it to enter the device and cause the sealing rings to break. This will cause the system as a whole to fail. As a result, the thinnest water film serves as a barrier between the rings. It lubricates, preventing rings from wearing out too soon.

One characteristic that sets wet type circulation pumps apart is their rotor, which is always submerged in the liquid they are pumping. A sealed metal glass effectively separates the electric motor’s location. Small heating systems typically use these devices. They don’t need any additional maintenance and are far quieter when operating. These pumps are usually serviced on a regular basis and adjusted to the correct specifications.

These pumps’ low useful action efficiency is a major drawback because of the sleeve’s inadequate tightness, which keeps the coolant and stator apart. It is important to consider that the pump is a protected stator in addition to a wet rotor when selecting the model of choice.

Circulation pumps from recent generations are virtually entirely automated. By allowing for prompt switching of the windings’ level, smart automation greatly improves the device’s performance. These models are most frequently applied to water consumption that is constant or slightly variable. Step adjustment made it possible to select the best operating modes and save a significant amount of power.

Recommendations for installing pumps

The location of the pump installation must be carefully considered in order to guarantee proper fluid circulation in the heating system. A location in the water’s suction area where there is consistently high hydraulic pressure should be identified.

The highest point of the pipeline is most often selected, from which the expansion tank rises to a height of about 80 cm. The use of this method is possible provided that there is a high height. Usually the installation of an expansion tank in the attic is practiced, subject to its insulation in the winter period.

In the second scenario, the tube is moved from the expansion tank to the reverse feed pipe, where it crashes rather than the supply pipeline. Since the pump’s suction pipe is located close by, the ideal circumstances for forced circulation are established.

The third way to install the pump is to place it right behind the expansion tank’s water intake point in the feed pipeline. In the event that a particular model is resistant to high water temperatures, using such a connection is feasible.

Recommendations for the selection of a pump

A private home’s circulation pump should operate efficiently for the majority of the time. There are specific requirements listed for each of these devices.

  1. The unit should have the necessary productivity or performance. The calculation of this parameter is carried out in conditions of minimum load on the device.
  2. Another selection criterion is the pressure that provides the necessary pressure in pipes and the entire system. In this case, it is necessary to take into account the operating conditions. They depend on the volume of the premises, the type of liquid in the system, ambient temperature and the coolant itself. The diameter of the pipes used is of great importance.
  3. When buying, it is necessary to take into account external factors related to the size of the unit, noise level during work, and difficulty maintenance of maintenance.

When the pump is chosen properly, it can operate steadily and dependably for extended periods of time under challenging circumstances.

Calculation of the performance of the circulation pump

You should perform the system’s hydraulic calculation before deciding on the preferred circulation pump model. The thermal power of the heating system under consideration has a direct bearing on the pump’s working performance value. As a result, the coolant volume that this type of unit pumps ought to heat the radiators in every room. As a result, the computations will need to know how much thermal power is required to heat the building as a whole.

As an example, you can use a private house, the area of which is 100 m 2. The value of thermal power will be within the limits 10 kW. Further, the performance of the pump is calculated according to the following formula: G= 3600Q/(C∆t), wherein G is the required amount of coolant (kg/h), Q- Thermal power of the system (kW), With – It is a specific heat capacity of water equal to 4.187 kJ/kg ºС,Δt – is the difference in temperature in supplying and reverse pipes. For calculations, its temperature is taken, which is 20 0 s. Thus, in accordance with the initial data, the productivity of the circulation pump will be: 3600 x 10 x 4.187 x 20 = 429.9 kg/h or in larger units – 0.43 t/h .

When selecting a pump, you’ll notice that the technical passport uses volumetric measurements rather than mass consumption units. In this instance, the density that contributes to 0.983 t/m 3 at t = +60 0 s must be used to convert the water’s volume into its volume: 0.43/0.983 = 0.44 m 3 /h. The device’s computed working performance will be the value that emerges.

Factors to Consider Key Points
Flow Rate Ensure pump matches system"s flow requirements.
Head Pressure Choose pump with adequate pressure for system"s height and resistance.
Energy Efficiency Look for models with high efficiency ratings to save on energy costs.
Noise Level Opt for quiet operation to minimize disturbance.
Size and Compatibility Ensure pump fits available space and is compatible with system components.

It’s essential to select the appropriate circulation pump for your heating system if you want to guarantee effective heat distribution throughout your house. It can be difficult to choose the best option when there are so many options on the market. You can, however, reduce your options and locate the ideal pump for your requirements by taking into account elements like the size, kind, and particular requirements of your heating system.

First and foremost, it’s critical to determine the size of your heating system. Higher flow rate pumps are usually needed for larger systems in order to efficiently circulate hot water. Smaller systems, on the other hand, might benefit from pumps with lower flow rates to avoid using too much energy. You can choose a circulation pump that best suits your heating system’s needs by being aware of its dimensions and capacity.

Second, think about the kind of heating system you currently own. Every type of heating system—radiant floor, baseboard, or conventional radiators—may have different needs when it comes to circulation pumps. While traditional radiator systems may benefit from pumps with adjustable speed settings to accommodate varying heating demands, radiant floor heating systems, for example, frequently require pumps capable of handling low flow rates but high pressure.

It’s also very important to assess the particular needs of your heating system. The choice of circulation pump is influenced by various factors, including the distance between the boiler and the farthest heating element, the number of bends and turns in the piping, and the desired temperature differential. Knowing these specifications will help you choose a pump that maximizes energy efficiency while satisfying your system’s needs.

In conclusion, careful consideration of elements like system size, type, and particular requirements is necessary when choosing the appropriate circulation pump for your heating system. By considering these factors, you can select a pump that will guarantee effective heat distribution in your house, which will ultimately result in increased comfort and energy savings.

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