• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a district heating system, which comprises - the district heating primary circuit including • a two-part heat exchanger (10) for domestic water, which comprises an upper part (108) and a lower part (109), • or a correspondingly arranged whole of two simple heat exchangers and intermediate pipes, and the heating circuit heat exchanger (14), where the return heating water has been connected to the domestic water heat exchanger (10) between the connections for cold water and hot water and the heating circuit heat exchanger (14) return line for the district heating water has been switched between , - a heating circuit (22) which circulates circulating water controllably at the use points via the heat exchanger (14) of the heating circuit. 10), - i bruksvattnets v the heat exchanger (10) is led to the district heating water which heats the return of the heating water from the intermediate stage output (102) to the heat exchanger (14) of the heating circuit, the heating circuit heat exchanger (14) being arranged to be heated by the district heating part (108) or with a combination of these, and between the intermediate stage outlet (102) and the intermediate stage input (103) there is a control valve (30) and a pipe (35). The invention also relates to a corresponding method.
    公开号:FI20215097A1
    申请号:FI20215097
    申请日:2021-01-29
    公开日:2021-07-30
    发明作者:Antti Hartman
    申请人:Hoegforsgst Oy；
    IPC主号:
    专利说明:

    The invention relates to a district heating system comprising a primary district heating circuit comprising at least o either a two-drive domestic hot water heat exchanger comprising an upper part and a lower part, and in which the upper part , o or an assembly of two single-drive heat exchangers and intermediate pipes arranged respectively, and a heating circuit heat exchanger in which the return heat circulation water is connected to the domestic hot water heat exchanger between the cold water and hot water connections and the district heating hot water heat exchanger to heat the domestic hot water by means of an intermediate supply connection via an intermediate supply connection, e a heating circuit with adjustable circulation of circulating water at consumption points via the heat exchanger of the heating circuit, N e temperature sensors at least district heating n for measuring flow and return water, heating circuit flow and return water and hot & water temperatures, and E 25 e control devices for controlling the district heating flow according to the set consumption.
    The invention also relates to a corresponding method.
    N District heating is typically produced as cogeneration of heat and electricity. In combined heat and power production, the amount of electricity produced by a back-pressure power plant depends on the temperature of the water returning from the district heating network.
    If the district heating water does not cool down to the low temperature required in the heat exchangers of heat consumers, the temperature of the returning district heating water must be reduced by condensing the heat in the water system or accepting a reduction in electrical power.
    More specifically, the amount of electricity produced in cogeneration is limited by the temperature of the returning district heating water.
    The expansion of the steam passing through the turbine takes place in the condenser to a pressure determined by the temperature using district heating water, which at the same time is heated.
    The higher the temperature of the return district heating water entering the condenser, the higher the pressure generated in the condenser so that the same amount of energy can be transferred to the same amount of district heating water.
    The condenser pressure, in turn, acts as a limiting factor in how much electricity can be generated by the turbine.
    Modern district heating plants also have flue gas scrubbers (flue gas scrubbers). These devices recover heat from the flue gases and heat the district heating return water, transferring heat to it.
    Heat transfer to the low-temperature return water is better. & - In addition, poor cooling leads to higher flow in the district heating network, which means that more water has to be pumped, and this increases - pumping costs.
    A higher return temperature also increases a 25 heat losses in the system. 3 1 The impact of district heating cooling is constantly increasing and more and more energy plants have moved or are moving to a pricing model in which good cooling in customer properties is rewarded with a lower energy price and / or a lower base fee. Typically, an attempt has been made to improve the cooling of the district heat by means of an intermediate supply circuit, in which the return of the district heat from the heat exchanger of the heating circuit is directed to the hot water heat exchanger to preheat the domestic hot water. The Finnish Energy Industry Association has presented the intermediate supply connection in the publication // District heating of buildings, regulations and instructions K1 / 2013 '/, which presents the district heating connection options and their recommended areas of use. However, especially in new projects, the return of district heating is too low-temperature to put in from a traditional location next to the cycle. Heat consumption takes place at a lower temperature than before, which is the case, for example, in an underfloor heating system. In new projects, the share of domestic water and, above all, its circulation in the heat demand is also emphasized, when the actual heat demand is small due to thick insulation and good heat recovery.
    DE 102013102147 A1 discloses a heat distribution center for a district heating system in which, in a domestic water heat exchanger, district heating water heating the return of the heating circuit is fed to the heating circuit. In this system = a maximum of 70 ° C district heating water can be introduced into the heating circuit. In current district heating systems, the temperature of the district heating water can be up to 115 ° C and the pressure 16 bar, in which case S district heating water cannot be fed into the heating circuit. In the E 25 publication in question, the water that has heated the hot water circuit mixes with the return water of the heating circuit and circulates from there to the heating devices. 3 In this case, it is possible that if 3 hot 50-55 ° C district heating water returns from the domestic hot water process, the heating circuit will be overheated. The temperature cannot be controlled downwards, in which case, for example, the system is not suitable for underfloor heating at all. Therefore, the heat distribution center disclosed in the publication is not suitable for use in a modern district heating system.
    FI 110027 B discloses a heat distribution center for a district heating system, in which three separate heat exchangers are required for hot water heat exchange, so that the heating water is heated in a separate hot water heat exchanger before it is fed to the hot water heat exchanger.
    In this heat distribution center, district heating water is led from the heat circulation water heat exchanger to the heat exchanger of the heating circuit and further through it.
    Also in this solution, it is possible that if a lot of hot 50-55 * C district heating water returns from the domestic hot water process, the heating circuit will be overheated.
    The temperature cannot be controlled down.
    The solution is not feasible and requires, for example, that the circulating water pump in the heating circuit be switched off during the summer, because otherwise the building will be heated even when it is not needed.
    The object of the invention is to provide an improved method for enabling greater cooling of district heating in a heating site.
    The characteristic features of the present invention appear from the appended claim 1. It is also an object of the invention to provide an improved district heating system enabling greater cooling of the district heat in a heating object.
    The characteristic features of the present invention are apparent from the appended claim 4. the incoming flow of district heating is directed to the upper part while being adapted to drain hot water, or a combination of two single-drive heat exchangers and intermediate pipes arranged respectively, and a heating circuit heat exchanger with return water circulating water the district heating water is connected to the heating circuit heat exchanger, and the district heating water return of the heating circuit heat exchanger is connected to the lower part of the hot water heat exchanger to preheat the hot water intermediate feeds in the field.
    In the method, the circulating water is circulated in a controllable manner at the consumption points through the heat exchanger of the heating circuit, at least the flow temperature of the heating circuit and the return temperature of the heating circuit are measured, and the district heating flow is controlled according to the set consumption.
    In the method, the temperature of the district heating water returning from the upper part of the hot water heat exchanger is measured by a temperature sensor, and the heating circuit heat exchanger is controllably heated by the district heating flow or heat exchanger if the district heating water temperature returning from the upper part of the domestic hot water heat exchanger is higher than the return temperature of the heating circuit and the set value of the heating circuit flow temperature is not exceeded, or to the extent that the heating circuit flow temperature setpoint is reached, and partly to the lower
    3 parts.
    In this way, the cooling of the district heating can be improved at the heating site and the heating controllability of the heating circuit heat exchanger is considerably better than the prior art methods, especially in low temperature heating circuits and at the beginning and end of the heating season and other times when heating is low.
    Preferably, the heating circuit heat exchanger is heated by a combination of district heating water returning from the upper part of the district heating flow and hot water heat exchanger, if the heating circuit flow temperature setpoint is not reached by the district heating heat returning from the upper part of the domestic hot water heat exchanger alone. In this way, a sufficient temperature is obtained in the heating circuit during the cold season or at other times when the heating demand is high.
    Preferably, the district heating water returning from the upper part of the hot water heat exchanger is led in its entirety directly to the lower part of the hot water heat exchanger if there is no need for heating in the heating circuit or if the temperature of the district heating water returning from the upper part of the hot water heat exchanger is colder than heating. In this way, the heat exchanger of the heating circuit is not heated unnecessarily outside the heating season, and on the other hand the heat exchanger of the heating circuit is not cooled if the district heating water returning from the upper N part of the hot water heat exchanger is too cool.
    > The district heating system according to the invention comprises an ER district heating primary circuit comprising at least one two-drive hot water heat exchanger comprising an upper part and a N lower part, and in which the incoming district heat flow is directed to the upper part 3 while being adapted to discharge or and a heating circuit heat exchanger with return circulating water connected to the domestic hot water heat exchanger between the cold water and hot water connections. circulating water in a controlled manner at consumption points via the heating circuit heat exchanger, temperature sensors for at least district heating supply and return water, heating circuit supply and return water and heating n- for measuring water temperatures, and control devices for controlling the district heating flow according to the set consumption. In addition, the domestic hot water heat exchanger of the district heating system comprises an outlet connection for conducting district heating water returning from the upper part to the hot water heat exchanger. district heating water returning from the upper part of the heat exchanger or a combination thereof, and between the outlet connection and the intermediate supply connection there is a control valve and a pipe for controlling the flow of district heating water returning all or part of the heating circuit to the heat exchanger or domestic hot water heat exchanger.
    N N In this way, the district heating cooling can be improved at the heating site.
    Q _ 25 When there is no need for hot water heating, the temperature of the district heating water returning from the hot water heat exchanger E is approx. 50 - 55 S ° C. In this case, for example, the floor heating of wet rooms can be heated completely with the same district heating water. By using the same N district heating water for the preheating of both the return circulating water and the heating circuit and the cold water, a considerably better cooling of the district heating water is achieved compared to the prior art.
    With respect to the prior art, in the system according to the invention, district heating can be efficiently transferred to the heating circuit via the heat exchanger of the heating circuit and to the hot water, whereby good district heating cooling is achieved without a third hot water heat exchanger. The control devices of the system according to the invention and the control valve and the pipe between the tap connection and the intermediate supply connection enable the control of the temperature of the heating circuit, which is not possible in the systems according to the prior art.
    Preferably, the district heating system includes a temperature sensor for measuring the temperature of the district heating water returning from the inlet connection of the hot water heat exchanger. Based on the temperature information, the district heating water flow can be adjusted advantageously with control devices.
    Preferably, the control valve between the tap connection and the intermediate supply connection is a three-way control valve. In this way, the same component can be used to control the flow of district heating water from the inlet connection to the intermediate supply connection and the hot water heat exchanger.
    In one embodiment, the control valve is located inside the drive = water heat exchanger. In this way, the control valve N can be integrated into the structure of the hot water heat exchanger. > Preferably, the shaft driving the control valve stem is located & selected in connection with the hot water heat exchanger. In this way, the opening degree of the E 25 control valve can be adjusted from outside the heat exchanger.
    N In another embodiment, the control valve is located & outside the hot water heat exchanger. In this way, the system according to the invention can also be implemented with heat exchangers which do not have a built-in control valve.
    Fdull, the heat exchanger of the heating circuit of the district heating system is two-drive, comprising hot water for the district heating water returning from the upper part of the heat exchanger to one intermediate supply. In this way, the operation of the heat exchanger in the heating circuit can be improved, especially in low-temperature circuits such as underfloor heating. When the flow temperature of the district heating network is reduced in the future, the importance of this will be emphasized. The invention will now be described in detail with reference to the accompanying drawings, which illustrate some embodiments of the invention, in which Figure 1 shows a domestic hot water heat exchanger according to the invention, Figure 2 shows a district heating circuit according to the invention, suitable for all heating Fig. 3 shows another district heating circuit according to the invention, which is particularly suitable for low temperature circuits, and Fig. 4 shows a plate heat exchanger which can be used in the district heating system according to the invention as a hot water heat exchanger.
    N E Figures 5a-5c show a D 25 ground using a two-way control valve fitted inside a plate heat exchanger,
    O N Figure 6 shows a simple solution with a two-way control valve.
    Figure 1 shows an embodiment of a domestic hot water heat exchanger 10 belonging to a district heating system according to the invention.
    The primary side of the two-drive hot water heat exchanger 10 includes an upper part 108 and a lower part 109 as well as a district heating inlet 101, an outlet connection 102, an intermediate supply connection 103 and a district heat return connection 104. The secondary side of the hot water heat exchanger 10 and the secondary In the hot water heat exchanger 10, the district heating water entering the district heating inlet 101 and leaving the outlet connection 102 of the upper part 108 is adapted to heat the return of the DHW circulating water.
    The district heating water entering the intermediate supply connection 103 of the lower part 109 and leaving the district heating return connection 104 is adapted to preheat the cold water KV so that the district heating water entering the intermediate supply connection 103 does not cool the return of the DHW DHW.
    In connection with the hot water heat exchanger 10, there is also a district heating water control system comprising a control valve 30, a pipe 35 and a temperature sensor 40 for measuring the temperature of the district heating water leaving the outlet connection 102. In this embodiment. also implements using 5 two-way control valves.
    The control valve 30 can be located 2 either outside the hot water heat exchanger 10, as in Fig. E 25 1, or inside the hot water heat exchanger 10.
    By adjusting the opening degree of the control valve 30, the flow of district heating 3 can be controlled according to the set consumption.
    By means of the control valve 30 3, the desired flow of district heating water from the outlet connection 102 of the upper part 108 to the intermediate supply connection 103 of the lower part 109 via the pipe 35 can be controlled.
    Figure 2 shows an embodiment of a district heating system according to the invention. The system is first based on a basic circuit that normally utilizes district heating, comprising a primary district heating circuit comprising a hot water heat exchanger 10 and a heating circuit heat exchanger 14. The district heating water is led from the district heating network to the domestic hot water heat exchanger The DHW circulation circuit LVK is connected to the DHW circuit 105 of the hot water heat exchanger 10 and to the DHW circuit 106 between the DHW circuit 107. The conventional system also includes a heating circuit 22 with adjustable circulation of the circulation water via the heating circuit heat exchanger 14. In the connection of the district heating system according to the invention, the district heating flow water is used in the upper part 108 of the domestic water heat exchanger 10 to heat the return of the DHW circulation water LVK. The district heating water used to heat the LVK circulating water is derived from the outlet connection 102 of the upper part 108 of the domestic hot water heat exchanger 10 to the heating circuit heat exchanger 14. The district heating flow water or From the heat exchanger of the heating circuit 14, the district heating water burns = along a common pipe to the lower - 25 parts 109 of the hot water heat exchanger 10 to the intermediate supply connection 103 for the preheating of the cold water DHW. The intermediate supply is arranged so that the district heating water coming from the heat exchanger 14 of the heating circuit does not cool the heating circuit water LVK.
    N By adjusting the degree of opening of the control valve 30, which in this embodiment is a three-way control valve in the upper part 108 of the hot water heat exchanger 10, the district heating water used to heat the DHW can be partially or completely controlled through. The temperature sensor 40 connected to the control valve 30 can measure the temperature of the district heating water returning from the upper part 108 of the hot water heat exchanger 10. Based on the temperature, the degree of opening of the control valve 30 can be adjusted. The measuring equipment of the district heating system further comprises the following temperature sensors: e district heating flow temperature sensor 41, e heating circuit flow temperature sensor 42, e district heating return temperature sensor 43, e heating circuit return water temperature sensor 44, e hot water temperature. Based on the readings of the temperature sensors, the overall flow of the district heating water can be adjusted according to consumption, whereby the desired cooling of the district heating water can be achieved.
    NN 20 If the temperature of the district heating water coming from the inlet connection 102 of the hot water heat exchanger 10, i.e. the reading N of the temperature sensor 40, is higher than the return temperature of the heating circuit 22, i.e. the reading of the temperature sensor 44 E, the district heating water from the connection 102 is fed to the heating circuit D 25 If more heating is required during the cold season, district heating water is additionally supplied to the heating circuit heat exchanger 14 from the district heating network via the control valve 52. Thus, when the heat demand is low, the district heating water from the intake connection 102 alone may be sufficient for the heating circuit heat exchanger 14. With low heat demand, overheating of the heating circuit heat exchanger 14 can be prevented by adjusting 14. The adjustment of the opening degree of the control valve 30 can be, for example, ten-step, i.e. adjustable on a scale of 1-10. The district heating water coming from the outlet connection 102 can also be directed entirely to the pipe 35 when there is a need for hot water in the building, but no need for heating, for example during the summer.
    The system shown in Figure 2 further includes a ventilation circuit 24 in which district heating returning from the district heating flow heat exchanger 16 is not directed to the hot water heat exchanger 10 to preheat the hot water because its allowable pressure drop would be exceeded.
    In the embodiment shown in Figure 2, the hot water heat exchanger 10 consists of one two-drive heat exchanger.
    The hot water heat exchanger 10 can also consist of two separate single-drive heat exchangers and intermediate pipes, which = are arranged as a functional unit, whereby the returning N circulating water LVK is connected between two separate heat exchangers.
    In this case, the tap connection is also arranged between two ÅR separate heat exchangers, and the district heating water returning from the heating circuit heat exchanger 14 is led to preheat the K hot water. 2 N Figure 3 shows another embodiment of the invention according to the invention, which is particularly suitable for low-temperature circuits such as underfloor heating.
    In this embodiment, the connection of the district heating system otherwise corresponds to the connection shown in Fig. 2, but the heating circuit heat exchanger 14 first comprises one intermediate supply. Then, in the upper part 108 of the hot water heat exchanger 10, the district heating water used for heating the DHW circulating water is led from the hot water heat exchanger outlet connection 103 to the intermediate supply connection of the heating circuit heat exchanger 14 to preheat the circulating water of the heating circuit 22. In addition, district heating flow water through control valve 52 is used to heat the heat exchanger 14 of the heating circuit. From the heat exchanger of the heating circuit 14, the district heat returns along a common pipe 10 to the lower part 109 of the hot water heat exchanger 10 to preheat the hot water.
    Figure 4 shows a two-drive plate heat exchanger that can be used in the district heating system according to the invention as a hot water heat exchanger 10.
    A district heating inlet 101, an outlet connection 102, a hot water connection 105 and a hot water connection 106 are disposed in the first end plate 110 of the hot water heat exchanger 10. - 107.
    S - The hot water heat exchanger 10 used in the district heating system according to the invention differs from a typical two-drive - second connection in that the second end plate 111 and 25 contain an intermediate supply connection 103 and the district heating water does not pass through the upper part 108 between the lower part 108 and the lower part 109. 112, = intended to improve the insulation of the lower part 109 from the return of the DHW circulating water. When applied to the connections shown in Figs. Instead of the two-drive hot water heat exchanger 10 shown in Fig. 4, the district heating system according to the invention can also be implemented with two single-drive heat exchangers and intermediate piping. In the embodiment shown in Figure 5a, the control valve 30 is a two-way control valve fitted inside the hot water heat exchanger 10, which is a plate heat exchanger, together with the pipe 35. According to Fig. 5b, the control valve 30 is formed in this embodiment by making an opening in the plate heat exchanger spacer 112 so that the flow of the tap connection 102 is connected to the flow of the intermediate supply connection 103 inside the plate heat exchanger (Fig. 1, 4). The opening is covered by a spindle 39 which is driven by a shaft 37 mounted inside the intermediate supply connection 103. Outside the plate heat exchanger there is a rotating joint sealed by the intermediate supply connection 103 to extend the shaft 37 for use outside the heat exchanger 39 and the seat 38. The mandrel 39 and the seat 38 have, for example, hemispherical surfaces which already = completely close the flow path or form a flow opening when they overlap. This adjustable control valve 30 does not have to be particularly tight. Minor leaks may be allowed.
    Q r The two-way control valve works well because the one-way valve 31 shown in Fig. 5a and the heat exchanger 14 of the heating circuit provide a flow resistance. In this case, the control valve 30 5 alone is sufficient to create a bypass flow.
    N The control valve 30 with its actuators can, of course, be a two-way control valve outside the plate heat exchanger between the tap connection 102 and the intermediate supply connection 103 (Fig. 1), as shown in Fig. 6. The described invention is well suited for use, for example, in HögforsGST's FiksuGST system, which has the necessary control equipment and sensing, with the exception of the temperature sensor 40. OF O
    N> O OF
    I Jami a PP O O LO OF O OF
    权利要求:
    Claims (10)
    [1]
    A method for improving district heating cooling, wherein the district heating system comprises e a district heating primary circuit comprising at least o either a two-drive hot water heat exchanger (10) comprising an upper part (108) and a lower part (109), and the incoming district heat flow is directed to the upper part 108) while being adapted to discharge hot water (LV), or an assembly of two single-drive heat exchangers and intermediate pipes arranged respectively, and a heating circuit heat exchanger (14) in which the return water circulating water (LVK) is connected to the domestic hot water heat exchanger (10). (KV) and hot water (LV) connections, and the district heating water returning from the upper part (108) of the hot water heat exchanger (10) is connected to the heating circuit heat exchanger (14), and the district heating water return of the heating circuit heat exchanger (14) is connected to the operating water heat exchanger. (10) to the lower part (109) to preheat the domestic hot water with an intermediate supply connection, 5 and in which method> e the circulating water is recirculated in a controllable manner at consumption points E 25 via said heating circuit heat exchanger (14), K e measures at least the heating circuit flow temperature and 3 heating circuit return water temperature, and O e controls the district heating flow according to the set consumption, characterized by e (10) the temperature of the district heating water returning from the upper part (108) is measured by a temperature sensor (40), and e the heating circuit heat exchanger (14) is controllably heated by the district heating flow or by the district heating of the hot water heat exchanger (10) so that the district heating water returning from the upper part (108) of the hot water heat exchanger (10) is led in its entirety to the heat exchanger (14) of the heating circuit, if the temperature of the district heating water returning from the upper part (108) of the hot water heat exchanger (10) is higher than temperature and heating cycle n the flow temperature setpoint is not exceeded, or o the district heating water returning from the upper part (108) of the hot water heat exchanger (10) is partly passed to the heating circuit heat exchanger (14) to the extent that the heating circuit flow temperature setpoint is reached; part (109). OF
    [2]
    Method according to Claim 1, characterized in that the heating circuit heat exchanger (14) is heated by a combination of district heating flow water and district heating water returning from the upper part (108) of the hot water heat exchanger (10) to 25 if the heating circuit flow temperature setpoint. the flow is not achieved solely by the heat generated by the district heating water returning from the upper part (108) of the hot water heat exchanger = (10).
    [3]
    Method according to Claim 1 or 2, characterized in that the district heating water returning from the upper part (108) of the domestic hot water heat exchanger (10) is led entirely directly to the lower part (109) of the domestic hot water heat exchanger (10) if there is no heating demand in the heating circuit (22). or if the temperature of the district heating water returning from the upper part (108) of the hot water heat exchanger (10) is colder than the temperature of the return water of the heating circuit.
    [4]
    A district heating system comprising e a district heating primary circuit comprising at least o either a two-drive hot water heat exchanger (10) comprising an upper part (108) and a lower part (109), wherein the incoming district heat flow is directed to the upper part (108) adapted to drain hot water (LV), o or an assembly of two single-drive heat exchangers and intermediate pipes arranged respectively, and a heating circuit heat exchanger (14) in which the return water circulating water (LVK) is connected to the hot water heat exchanger (10) for cold water (DHW) and hot water LV) between the connections and the district heating water return of the heating circuit heat exchanger (14) is connected to the lower part (109) of the hot water heat exchanger (10) to preheat = hot water with intermediate supply connection via intermediate supply connection 2 (103), T 25 e without heating circuit (22) - E at the heating circuit via the heat exchanger (S) (14) of said heating circuit, 5 e temperature sensor at least for measuring the temperatures of the district heating flow and return water, the heating circuit flow and return water and the hot water (DHW), and e control devices for controlling the district heating flow according to the set consumption, characterized in that the hot water heat exchanger (10) comprises an outlet connection (102) for conducting the district heating water returning from the upper part (108) to the outside of the hot water heat exchanger (10), e in the domestic hot water heat exchanger (10) the district heating water wherein the heating circuit heat exchanger (14) is adapted to be controllably heated by district heating flow or district heating water returning from the upper part (108) of the hot water heat exchanger (10), or a combination thereof, and e has a control valve ( (35) for controlling the flow of district heating water returning from the inlet connection (102) n or part of the heating circuit to the heat exchanger (14) or to the lower part (109) of the hot water heat exchanger (10).
    IS
    [5]
    A district heating system according to claim 4, characterized in that the system comprises a temperature Q status sensor (40) for measuring the temperature of the district heating returning from the inlet connection (102) of the hot water heat exchanger (10). =
    [6]
    District heating system according to claim 4 or 5, characterized in that said control valve (30) is a three-way control valve.
    [7]
    District heating system according to any one of claims 4 to 6, characterized in that said control valve (30) is located inside the hot water heat exchanger (10).
    [8]
    A district heating system according to claim 7, characterized in that the shaft driving the stem of said control valve (30) is arranged in a selected connection of the hot water heat exchanger (10).
    [9]
    District heating system according to any one of claims 4 to 6, characterized in that said control valve (30) is located outside the hot water heat exchanger (10).
    [10]
    District heating system according to one of Claims 4 to 9, characterized in that the heat exchanger (14) of the heating circuit is two-drive, comprising for one intermediate supply hot water for the district heating returning from the upper part (108) of the heat exchanger (10).
    OF
    O
    N 5
    O
    OF
    I Jami a
    OF
    O
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