Underfloor Heating Pump: How To Choose A Circulation Option For The Floor, Professional Advice When Connecting To A Manifold, How To Calculate The Power

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Underfloor Heating Pump: How To Choose A Circulation Option For The Floor, Professional Advice When Connecting To A Manifold, How To Calculate The Power
Underfloor Heating Pump: How To Choose A Circulation Option For The Floor, Professional Advice When Connecting To A Manifold, How To Calculate The Power

Video: Underfloor Heating Pump: How To Choose A Circulation Option For The Floor, Professional Advice When Connecting To A Manifold, How To Calculate The Power

Video: Underfloor Heating Pump: How To Choose A Circulation Option For The Floor, Professional Advice When Connecting To A Manifold, How To Calculate The Power
Video: Underfloor heating manifolds- How do they work? Radiators and Underfloor heating? 2024, March
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Warmth in the house is a necessity that every person needs. There are a large number of methods and devices for space heating. One of them is the underfloor heating system. It is widely used in residential and social facilities. There are no special difficulties in organizing a warm floor, therefore many take up the implementation of this idea without the involvement of specialists. Today we will deal with the choice of a pump, which is considered a mandatory component of a warm floor.

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Features of the

The construction of water floor heating consists of a large number of pipes, which have bends in many places. Water cannot independently move through such a system, therefore, it is necessary to install a centrifugal pump that will circulate the coolant. Water loses its thermal energy, which leads to a change in pressure within the system. The circulation pump belongs to the group of centrifugal devices. Its functioning depends on an electric motor and a shaft equipped with an impeller.

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For the manufacture of the case, different materials are used: stainless steel, cast iron, various kinds of polymers. For a warm floor, tightness is not characteristic: air will accumulate inside the system during operation.

This state of affairs is associated with oxidation processes, before which cast iron does not have high resistance. Therefore, it is better not to choose such pumps.

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For connection to the heating system, the pump casing has a pair of nozzles. An additional feature is an air vent, which allows air to be removed from the system. In its absence, the user will have to unscrew the nut on the body by himself, thus releasing the accumulated air in the system. In order to find a pump that will exactly match your requirements, you need to understand this topic well. All of this can be found below.

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What is it needed for?

The underfloor heating system consists of narrow pipes, which often and strongly bend during the installation process. Such a complex design does not allow the coolant to circulate freely. It is also worth adding here the maximum temperature of the coolant, which should not exceed 40 degrees. Under such conditions, it is problematic to achieve high efficiency and performance of the system.

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Any malfunction will negatively affect the condition of the water circuit and cause the formation of air pockets. To avoid such problems, it is imperative to install a pump. This mechanism is responsible for the following important points:

  • creating the right pressure and maintaining it at the right level;
  • ensuring water circulation;
  • uninterrupted work;
  • efficient heat transfer;
  • lack of air congestion;
  • prevention of problems.
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All this will be possible with the right choice of a pump that will exactly match the parameters of the system and the requirements of the user. In rare cases, the underfloor heating system can function normally without a pump. Such situations occur, albeit rarely:

  • work from central heating;
  • connection of the system with hot water supply (in apartments, a heated towel rail is often chosen for these purposes);
  • the presence in the gas boiler of the possibility of simultaneously connecting several water circuits.
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Views

All circulation pumps that are produced for underfloor heating are similar to each other. Of course, each manufacturer wants to create a unique product, but so far no one has succeeded in making a breakthrough in this area. A general classification is applied to all models, having studied which it will be easier to choose a circulation pump.

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Wet rotor

This type of device is mini motors. Their dimensions are reduced due to the close location of the impeller to the rotor. In some models, these two elements are located in the same housing. To prevent water from entering the engine, manufacturers have a reliable oil seal on the drive shaft. They create it from extra strong rubber, which has high resistance to external factors.

Some models have a double waterproofing … Due to the fact that the motor is small, it can be installed in a heated room. It works silently, has low power consumption, and is characterized by light weight.

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With dry

Dry rotor devices have a separate housing for the operating elements. They are very powerful, therefore they are chosen for large-sized premises.

To install such pumps, a separate technological room is required (most often it is a boiler room). Installation is carried out on a separate frame.

The weight of these devices is impressive, the work is accompanied by noise, it is advisable to use them for large areas, therefore, they are rarely chosen for private buildings. Dry rotor pumps are supplied with an additional protection kit for electrical components.

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Industrial

For such objects, pumps of the same name are produced. Their fastening is carried out by connecting flanges with a diameter of more than 50 mm. Such pumps have double structure, which is convenient in severe frosts and increased load on the system. At the right time, the second pump is activated, as a result, the efficiency increases, the coolant circulates more actively through the system. In case of a breakdown of one motor, you can turn on the second.

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Models are classified according to the number of speeds. Single-speed versions are designed to work with one temperature regime. Multi-speed ones are designed to work in any multi-temperature heating system (for heating various objects).

For uniform heat transfer, it is necessary to ensure a stable speed of movement of the coolant.

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How to choose?

In order not to be mistaken with the choice, it is necessary to study the advice of professionals, which we have selected for you:

  • The purchase of a pump must be made simultaneously with all structural elements of the future system. This will maximize the efficiency of the system and ensure its durability. Repair work will be expensive, so it's best to protect yourself right away.
  • Pump selection should be based on the performance of the unit. This parameter can show the productivity in liters or cubic meters. It all depends on the amount of coolant that will be in the system. We multiply this value by 3 and get the required pump performance.
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  • The head must be selected in accordance with the parameters of the pipes that make up the system (taking into account the diameter, length, material).
  • A small pump is easier to place indoors, but the size of the unit is directly related to its capacity. Small pump - limited power.
  • Phase also influences pump selection. Usually, single-phase units are chosen for private facilities. But industrial areas require the installation of pumps with a three-phase motor.
  • Foreign pumps are not always better than their domestic counterparts. The products of our manufacturers are designed for the low water quality and usage patterns typical for our area.
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How to calculate the power correctly?

You cannot equip the system with the first pump you like and connect it to the manifold. Its parameters must clearly correspond to the requirements of the system. For this, calculations are made that make it possible to determine the required power and head indicators of the unit.

To determine the power, it is necessary to use the formula Q = 0.86 × Pн / (tpr.t - trev.t), where:

  • Q is the flow rate of the coolant per hour, measured in cubic meters;
  • Pн - the maximum power indicator on the circuit, measured in kW;
  • tpr. t is the temperature level of the coolant at the supply;
  • torev. t is the temperature level of the coolant at the outlet.
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If there are several contours, you will have to calculate the total indicator in which each is taken into account. In the formula, there is a difference in the temperatures of the coolant at the inlet and outlet. This indicator is formed depending on the following indicators:

The length of the system directly affects the temperature difference. With an increase in the contour, the area intended for heating increases. This leads to an increase in thermal energy consumption and a significant temperature difference

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  • The thermal insulation of the floor covering must be organized at a high level, especially for the premises on the ground floors. If the insulation technology has been violated, the energy will be spent on heating the soil, and not the room. In this case, the heat loss will be colossal. This factor is reflected in the pump operation.
  • The climatic location also affects the temperature difference and the required capacity of the equipment. For the northern regions, a higher power reserve is required. For the southern regions, you can save a little on this indicator.
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You need to choose a pump not only in terms of power. The calculation of the water velocity must also be done. This indicator must overcome the hydraulic resistance that is created by the water inside the system. The value of the hydraulic resistance is influenced by a number of factors:

  • length of the contour;
  • pipe section indicator;
  • water circulation rate.
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Control system and work progress

The pump is based on a housing and a motor (rotor). It is screwed to the inside of the case. The impeller is located on the motor shaft. This information is enough for an ordinary user, there is no need to know more.

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The operation of the pump within the system is extremely simple. Water enters the housing, it is captured by the impeller and thrown out with force in the opposite direction. Many pumps are equipped with a variable speed function. In this case, it is possible to achieve optimization of the workflow, which will allow economical use of heat.

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The pump operation control process can be carried out in several ways:

  • The mechanical method of regulation requires the user to control the situation and periodically intervene in the pump. For this, a special mechanism is provided on the body. Such units are affordable, but not particularly convenient to use, although you can put up with such inconveniences.
  • Electronic control automates the process of selecting and setting the desired speed. You will have to overpay a little for such units, but the operation process will not require intervention.
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Manufacturers

To make the best choice and put the right pump into the system, which will suit you in all respects, you need to navigate the manufacturers on the Russian market. We have selected the most reliable ones that are worthy of attention:

  • Grundfos is a brand from Denmark, well known in the field of heating systems.
  • Wilo is a company from Germany that produces high-quality and reliable equipment. The cost of these units is appropriate.
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  • DAB pumps produced in Poland. They are more affordable than the units described above. Their quality and durability are at the proper level. DAB pumps are a decent option for a tight budget.
  • Sprut is a Chinese company that supplies affordable pumps to the Russian market. The quality is satisfactory, with proper care and gentle use, they can last a long time.
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Examples of successful work

An excellent example of how a floor heating system should be designed. The pump is positioned correctly, which is extremely important for its long and trouble-free operation. A separate building has been designed for the system, which will hide all the elements and preserve the design of the room.

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You can find out how to choose a circulation pump for a warm floor in the following video.

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