Block heat points using dependent connection to the heat network

The main advantages of individual heating points are as follows:

- the possibility of providing comfortable conditions inside the premises. This is especially relevant in the case of complex insulation of the facade of buildings, when heat losses are reduced, and heat is supplied in volumes for insulation;

- reliable and stable functioning of heat supply, thanks to full automation of heat supply;

- due to the ability to flexibly regulate heat supply, unproductive energy consumption is reduced, in some cases by up to 30%;

- maximum minimization of capital and operating costs is possible.

In heating points that are connected to heating networks according to a dependent scheme, the heat carrier that comes from the network is directly fed into the heating system of the house. Separating heat exchangers are not installed in these thermal points. In this way, a low cost is achieved, the possibility to use the coolant temperature as much as possible, as well as ease of maintenance. All other consumer characteristics, such as full automation, regulation of the supply temperature to the heating system depending on the outside air temperature, are similar to the heat points of other designs.

The heating point connected to the heating network according to the dependent scheme works as follows:

The coolant comes from the heating network (MS) through the ball valve #1, is cleaned of mechanical impurities (not trapped by the mud of the fuel injection unit) with the mesh filter #9 and is fed to the pressure drop regulator #2. The type of pressure drop regulator depends on the pressure values (in the supply and return pipelines of the DHW) and the flow rate of the coolant. This regulator ensures efficient operation of temperature control valve #3. Next, the coolant passes through the throttle washer and valve No. 3, which is actuated by an electric drive with the help of an electronic regulator installed in the control panel No. 6 of the signal from the outdoor air temperature sensors No. 4 (weather regulation according to the temperature schedule) and the coolant temperature sensors No. 5. Next, the high-temperature coolant is mixed with water from the return line of the heating system, passing through the jumper with non-return valve No. 10. The circulation of the coolant in the system is provided by the circulation pump group, which consists of working and reserve pumps No. 8. To ensure the absence of vibrations and noise in the pipelines of the system, flexible inserts No. 12 are used. Sensor-relay "dry run" No. 13 turns off the pumping group when the pressure in front of it drops below 5 meters of water column. Safety valve No. 7 protects the system from exceeding the calculated pressure of the coolant. Bypass valve No. 11 can be installed in BTP, which protects against exceeding the working pressure of the coolant in the heating system and allows it to flow through a small circuit. In accordance with the current regulations, regulation of the rotation frequency of circulation pump motors must be applied in heating systems, which can be implemented by installing a frequency converter in the control panel No. 6 or by using pumps with a built-in frequency converter. In the case of using frequency regulation, installation of a bypass valve is not required.

The given scheme corresponds to the European experience of regulation of subscriber inputs, although three-way control valves are most often used in European countries. The domestic experience of using three-way valves turned out to be negative. Throttle (limit) washers are often installed in front of them, which limit the flow of water. In this case, when the command to increase the flow of network water is received, the valve simultaneously reduces the flow of return water entering the mixing, while the increase in the flow of network water is prevented by the throttle washer. As a result, the total consumption of mixed water decreases, which leads to a hydraulic imbalance of the heating system. In a scheme with a through-flow control valve, the total flow rate of the circulating coolant never decreases, so it is possible to avoid an imbalance. In the case of using this BTP "DAN" in the project, the designer must circle its boundaries with dotted lines in the general schematic diagram of the TP. Then, in the equipment specification, specify the name and marking of the block in one position. The working documentation necessary for inclusion in the project will be provided by our specialists after processing the data of the questionnaire filled out by the designer.

Technical parameters of heating points heating/ventilation with dependent connection to the vehicle

Heating points  marking

O(B) -  heating points of the heating/ventilation system according to the dependent scheme

25/32 – the main diameters of BTP pipelines

c - type of pumps - vertical

d - type of pumps - horizontal

50 - maximum heat load, kW

* - technical information is provided upon request

The weight of  heating points is given without taking into account the weight of water.

An example of heating points  heating/ventilation with dependent connection to the vehicle

Technical characteristics of BTP are given in view of the presence of an automation shield.

Upon request, automation of several BTPs from one panel or automation in the general panel of the thermal point is possible.

We are constantly working on changes in the construction of BTP, which are aimed at improving operational characteristics.

Our specialists carry out an individual calculation of BTP and its cost based on initial parameters other than those specified in the table