Circulating pumps for heating systems: technical characteristics, operating principle, instruction, feedback
When solving problems of heating for home, it is necessaryconsider the total number of square meters. When the calculation of the area is carried out not by units, but by hundreds, and in the building not one floor, the system with natural circulation does not cope with its tasks. In such systems, the pressure in most cases is not higher than 0.6 MPa, for this reason a pump can not be dispensed with. From the article below you can find out what circulation pumps are for heating systems, the technical characteristics of these devices, the principle of operation, and how to choose them correctly.
Principle of operation
Structurally, this pump equipment resembles a drainage system: the body is made of stainless metals, equipped with a rotor and a shaft, complete with an impeller.
Consider circulating pumps for heating systems. The principle of operation is based on the following:
- The electric motor is driven by a rotor. A similar system takes water from one side, and on the other hand pumps it into the pipeline.
- By means of centrifugal force, the coolant moves through the heating system.
- The pump helps overcome the resistance, which invariably occurs on individual sections of the pipeline.
So, there are two main types of pumps: with a "wet" rotor and a rotor "on dry". What does this mean? Let's consider in more detail these circulating pumps for heating systems, technical characteristics of these devices, too, will not be ignored.
In this case, the rotor is in no waycontact with the coolant - its working part is separated from the engine by means of O-rings. The efficiency of pumping equipment of this design reaches about 80%. However, the operation of the "dry" rotor is accompanied by a noise effect.
Circulating pumps for heating systems (aschoose this equipment, we will consider below) with the "wet" rotor, on the contrary, together with the impeller are immersed in the coolant, which cools the electric motor while playing the role of lubricant. In this regard, the noise level, which is created by the engine, is much lower. Such a variant of the engine does not require special maintenance for a long time. However, compared to the previous version, its performance is not so effective - the efficiency is reduced to 50%. Quietly operating equipment of "wet" type is traditionally used in domestic heating systems for coolant circulation.
Circulating pumps for heating systems: how to choose?
When choosing pumping equipment for a heating system, it is recommended that certain parameters are taken into account. Let us consider them in more detail.
Diameter of the pipeline
Typical dimensions of pipelines in placeThe connection of the pump to your heating system can be from 25 to 32 mm. When choosing pumping equipment, you need to make sure that the nuts are included in the kit, which are necessary for its quick installation and dismantling.
Productivity of pumping equipmentis the main parameter, which is the volume of the heat carrier, which pumps circulating pumps for heating systems. The technical characteristics of the pump in this case depend on the performance, which is defined as follows:
Q = N / (t2- t1), where:
- Q is the flow rate of pumping equipment.
- N - power (index) of the heat source, which can be a gas boiler or column.
- t1- the temperature of the liquid circulating in the return line. As a rule, it is from + 60 ° C to + 70 ° C.
- t2- the temperature of the liquid in the supply line, that is, the one that moves in the direction from the heat source. Boilers usually maintain temperatures from + 90 ° C to + 95 ° C.
Calculation of the future heating system,hydraulic calculation, as well as the calculation of its losses, are carried out with the aim of correctly selecting the design parameters of the pump, which subsequently overcomes the resistance in the system.
System elevation level
This is an indicator of the maximum possible pressure, which the heating system is capable of. The level of recovery in the system reflects the total hydraulic resistance in the system as a whole.
When calculating the hydraulic resistanceThe number of floors in a heated building with a closed heating system is not determinative, on average it is about 2-4 m of water. post. For heating systems installed in low-rise buildings traditionally, this parameter is identical.
Diameter of connection and maximum headare indicated in the marking of pumping equipment. For example, consider circulating pumps for Grundfos heating systems. The characteristics of the Grundfos UPS 25-60 pump are as follows: the diameter of the pipeline to be connected must be 25 mm, and its head is 6 m water. post.
Also there is a pumping equipment of this firm with a lifting height of 3, 4 and 8 meters. In such a case, the numbers 30, 40 and 80 are indicated on their labeling, respectively.
Also consider circulating pumps for systemsheating Wilo (selection instructions are similar to the previous version). For example, a Wilo Star-RS 30/6 pump can be connected to a 30 mm pipeline, and its head is 6 m of water. post.
Need for energy
In addition, there is another parameter thatit is necessary to take into account, albeit indirectly. This is the need of the structure in the heat. The value of this parameter is indicated in the building's passport while it is being designed. If these data are not available, then it is not difficult to calculate them by yourself.
For each country per 1 m2Accept their own heat standards. According to European standards for heating 1 m2single-family or semi-detached house will require 100 watts and 70 watts for multi-apartment buildings. Russian standards are established for each specific region in accordance with the requirements of the SNiP.
Any pumping equipment has up to threeconnections to the power grid. On the body of the device is a plate that contains information on the electric current it consumes. Each position of the switch will correspond to the new capacity of the equipment, namely the amount of coolant per hour pumped by the pump through the heating system. The third position corresponds to the maximum possible pump capacity. The maximum consumption is indicated on the case of the device.
Serially produced circulation pumps forHeating systems technical characteristics are averaged. Therefore, it is important to consider the individuality of your heating system. Why excessive noise in pipelines, resulting from excessive pump power (this is noted in the feedback of users) when the system is active?
The modern market offers a lot of differentpumps for heating. Specialists among foreign manufacturers distinguish circulating pumps Grundfos and Lowara. Also high-quality high-tech products are supplied by the Italian manufacturers of circulation pumps Ebara and Speroni.
Circulation pumps for heating systems"Octopus" at relatively low power levels are characterized by high efficiency. If you plan to increase the operating life of the boiler, save energy, and also provide the optimal thermal conditions in the premises, then this equipment will suit you as well as possible.
At present, there are many modifications andtypes of pumping equipment. In most cases, a model range with a different cross-section, performance and head is presented. As a result, the consumer can choose the best option for his heating system.
The principle of the pumps is organized in such a way,so that the required fluid pressure is maintained by means of special rotors. As already mentioned above, rotary pumps are divided into "wet" and "dry". The difference is only in the operating conditions of the equipment and its ability to interact with the coolant. If you decide to purchase "dry" or submersible equipment, then the ideal option will be the circulation pumps for Wilo heating systems - customer reviews about them are mostly positive. Trademark Wilo has long established itself as a manufacturer of durable and high-quality products.