SU1245807A1 - Open double-pipe heat supply system - Google Patents

Description

one

The invention relates to the centralized heat supply of public and industrial buildings, namely, to open two-pipe heat supply systems.

The aim of the invention is to reduce unproductive heat losses by ensuring proportional deregulation in the heat supply system.

FIG. 1 is a schematic diagram of an open two-pipe heating system; in fig. 2 - design piezometric graphs of the open heat supply system, associated with the design scheme of the thermal water network, with pipe diameters.

The system contains a source of heat 1, a thermal water network with supply and return pipelines 2 and 3, respectively, pressure regulators 4 up to itself on the return pipe 3, pumps 5, plants 6 and 7, respectively, of heating and hot water supply, equipped with each torus 8 temperature.

In this case, in the graph of FIG. 2 lines of pressure in the absence of dismantling are marked with dots 9 through 31, and the line of pressure with a maximum distribution of water from supply line 2 is marked with points U, 10 11

12; 13, and; 15, 16 17, 18; Yu; 20; 2i, 22, 23, 24,

25; 26: 2 /, 28, 29; thirty; ZG, and the diameters of the supply pipelines 2 in the first along the heat carrier l sections between points 9-10, 10-11, 11 -12 of the heating network are made of pipes of smaller diameter than the return pipelines 3 in the corresponding areas between points 31-30, 30 -29, 29-28, and the feed pipelines of the last 2 along the coolant sections between points 16-17, 17-18, 18 -19 are made of a larger diameter than the return pipes 3 in the corresponding areas between points 23-22, 22-21 , 21-20.

Opened two-pipe heating system works as follows.

During the warm time of the heating season, when the temperature in the supply pipe 2 exceeds that required for hot water supply, the water from the supply, its pipe 2 of the heating network is fed to the installation 7 of the hot water supply. In this case, the flow in the supply pipe 2 increased

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This causes an increase in friction pressure loss. The line of pressure passes through points 9 to 31 in the absence of a tap. The line of pressure passes through points 9, 10, 11, 12 13 14 15 at the maximum distribution of gas from the supply line 2; sixteen; 17, 18: 19 20: 21, 22, 23, 24 25, 26: 27: 28: 29; ZO: ZG. The flow rate of the network water through the heating unit 6 is determined by the difference in pressure in the supply and return pipes 10 and 3 of the heating network in accordance with points 10-30, 11-29, 12-28, 13-26, 14-25, 15-24, 17-22, 18-21, 19-20 piezometric graph (Fig. 2).

On piezometric graph (Fig. 2)

 5 shows the change in pressure of the heat network in the zones corresponding to points 8-27, 27-23, 23-20 and divided according to the number of pumps 5.

At the maximum water separation from the supply pipe 2, the available heads, which determine the flow rate of heating water, are shown as lines between points 10-30 {11-29: 12 28 3-26, 14-25 15-24 17-22,, 19 20.

Calculations show that the fluctuation of the flow rates of network water in heating installations 6, connected to different parts of the thermal water network, during water extraction from supply lines 2 can be 50% or more.

Thanks to the fact that the first in the course

30 of the coolant sections of the supply pipeline 2 between points 9-10, 10-11, 11-12 (Fig. 2) have diameters smaller than the corresponding sections of return pipelines 3 between points 31-30, 30-29, 29-28, decreasing available head

 for heat consumers (units 6 and 7) increases. At the same time, the last along the coolant sections of the supply pipelines 2 between points 16-17, 17-18, 18-19 have a larger diameter than the corresponding sections of return pipes 3 between points 23-22, 22-21, 21- 20, which leads to a reduction in the change in disposable heads at consumers (installation 6, 7) during the withdrawal of the feed pipe 2,

Thus, a proportional change in the relative costs in the whole heat supply system is achieved.

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Claims (1)

OPEN TWO-TUBE HEAT SUPPLY SYSTEM, containing a heat source, supply and return pipelines, the last of which is equipped with a pressure regulator "to itself", a pump installed on at least one of the mentioned pipelines, and heating and hot water supply systems included in a dependent scheme , characterized in that, in order to reduce unproductive heat losses by ensuring proportional adjustment in the heat supply system, the first sections of the supply pipe from the heat source are made with diameters smaller than the diameters of the corresponding sections of the return pipe, and the last sections from the heat source of the supply pipe are made with diameters greater than the diameters of the corresponding sections of the return pipe. Figure 1 SU ,, 1245807