ONE-PIPE HYDRONIC HEATING CONTROL DEVICE

Abstract

Heat exchanger output control device in a one-pipe heating network characterized in that a first T-branch, which is connected to a second T-branch interconnected to a primary outlet pipe connection of a primary outlet pipe to a heat source through a primary outlet, is connected to the primary inlet pipe connection through a primary inlet. The first T-branch is connected to a secondary supply pipe connection through a secondary supply pipe with a secondary supply temperature sensor, and the second T-branch is connected to a secondary return pipe connection through a secondary return pipe with an additional secondary return temperature sensor. An impeller of a pump is connected to a secondary circuit to pump the heat-transfer medium from the first T-branch through a heat exchanger back to the second T-branch, and to connected to a electrical motor provided with a control unit connected to secondary supply and return temperature sensors.

Claims

1. One-pipe hydronic heating control device provided with a secondary supply pipe connection on an inlet pipe of an exchanger, a secondary return pipe connection a return pipe of the exchanger, a primary inlet pipe connection on a primary inlet pipe from a heat source and a primary outlet pipe connection on a primary outlet pipe to the heat source, and a pump provided with a control unit to pump heat-transfer medium, wherein a first T-branch, which is connected to a second T-branch interconnected through a primary outlet, is connected to the primary inlet pipe connection through a primary inlet, wherein a first T-branch is connected to the secondary supply pipe connection through a secondary supply pipe with a secondary supply temperature sensor and wherein the second T-branch is connected to the secondary return pipe connection through a secondary return pipe with a secondary return temperature sensor and the pump impeller is connected to the secondary circuit such that it pumps the heat-transfer medium from the first T-branch through the heat exchanger back to the second T-branch, wherein the pump impeller is connected to an electric motor provided with the control unit interconnected with the secondary supply temperature sensor and/or the primary inlet temperature sensor and the secondary return temperature sensor.

2. The device according to the claim 1, wherein it is a compact unit integrating the primary inlet pipe connection of the primary inlet, the first T-branch, the second T-branch, the primary outlet pipe connection of the primary outlet, the secondary supply pipe of the secondary supply pipe connection, the secondary return pipe of the secondary return pipe connection, the secondary supply temperature sensor, the secondary return temperature sensor, pump impeller with electric motor and control unit.

3. The device according to the claim 2, wherein the compact unit is provided with the housing of the pump.

4. The device according to the claim 3, wherein the housing of the pump integrated with the T-branches.

5. The device according to claim 1, wherein the compact unit is provided with the base for the temperature sensor on the secondary supply pipe and the base for the temperature sensor on the secondary return pipe.

6. The device according to claim 1, wherein it is provided with the selector to adjust the maximum heat flow in Watts and/or equivalent heat flow units.

7. The device according to claim 1, wherein it is provided with the analog input for the heat flow reference with defined limits for 0 and 100%.

8. The device according to claim 1, wherein the data line connected to the master computer and/or to another control unit is connected to the control unit.

Description

EXPLANATION OF DRAWINGS

[0017] Specific embodiments of the technical disclosure are shown schematically in the accompanying drawings.

[0018] Wherein, FIG. 1 shows a connection diagram implementing the device for heat exchanger output control in a one-pipe heating network.

[0019] FIG. 2 is an axonometric view of the device used to control the heat exchanger in a one-pipe network; and

[0020] FIG. 3 shows a quarterly section illustrating the inner composition.

EXAMPLES OF THE INVENTION EMBODIMENTS

[0021] The connection consists of the device 1 connected through the secondary supply pipe connection 15 and the supply pipe 16 of the heat exchanger 2, and through the return pipe 17 of the heat exchanger 2 and the secondary return pipe connection 18 to the heat exchanger 2. Furthermore, the device 1 is connected through the primary inlet pipe connection 8 to the primary inlet pipe 7, through which the heating medium is supplied from a heat source. From the primary inlet pipe connection 8, the primary inlet 9 is led to the first T-branch 4 connected to the second T-branch 5, from which the primary outlet 10 leads to the primary outlet pipe connection 11 connected to the primary outlet pipe 12, through which the heating medium is returned to the heat source. The secondary supply pipe 12 of the device 1 leads from the first T-branch 4 to the secondary supply pipe connection 15. The secondary return pipe 19 of the device 1 leads from the second T-branch 5 to the secondary return pipe connection 18. The secondary supply temperature sensor 20 is placed so that it can sense the temperature of the heat-transfer medium entering the heat exchanger 2, that is, it is connected to/into the secondary supply pipe 13 or the supply pipe 16 of the heat exchanger 2. The secondary return temperature sensor 22 is placed so that it can sense the temperature of the heat-transfer medium leaving the heat exchanger 2, that is, it is connected to/into the return pipe 17 of the heat exchanger 2 or the secondary return pipe 19. The pump impeller 3 is connected to pump the heat-transfer medium from the first T-branch 4 through the heat exchanger 2 back to the second T-branch 5. Thus, it is connected in correct orientation anywhere to the secondary circuit formed by the secondary supply pipe 13 inlet pipe 16 of the heat exchanger 2 return pipe 17 of the heat exchanger 2, and secondary return pipe 19. Via force, in contact or contactless, using the force connection 26, the pump impeller 3 is connected to the electric motor 25 connected to the control unit 6 through electrical connection 24. Via cable or wireless, the secondary supply temperature sensor 20 is connected by first communication channel 21 to the control unit 6, so that information about the secondary supply temperature is available to the control unit 6. Via cable or wireless, the secondary return temperature sensor 22 is connected by second communication channel 23 to the control unit 6, so that information about the secondary return temperature is available to the control unit 6. The control unit 6 senses the signal from the maximum required heat flow selector 32 and writes it to the control unit 6 memory to a space intended for the maximum required heat flow. The value of the maximum required heat flow can also be modified via the data line 31. Further, the control unit 6 senses the heat flow reference value from the heat flow reference line 33, or communicates the heat flow reference value via the data line 31. By multiplying the value of the maximum required heat flow by the heat flow reference value, the control unit 6 calculates the absolute heat flow reference value, subsequently adjusting the pump 3 speed so that the estimated absolute heat flow approaches asymptotically the absolute heat flow reference value.

[0022] The device of FIG. 2 represents an embodiment of the device 1 according to connection of FIG. 1, integrating primary inlet pipe connection 8, primary inlet 9, first T-branch 4, second T-branch 5, primary outlet 10, primary outlet pipe connection 11, secondary supply pipe 13, secondary supply pipe connection 15, secondary return pipe 19, secondary return pipe connection 18, secondary supply temperature sensor 20, communication channel 21, additional secondary return temperature sensor 22, additional communication channel 23, pump impeller 3, electric motor 25, electrical connection 24 and control unit 6. Of which the communication channel 21, the additional communication channel 23, the electrical connection 24, and the control unit 6 are not shown. FIG. 2 shows that a spatially important element is the housing 14 of the pump 3. In a preferred structural embodiment, the housing 14 of the pump 3 is integrated with the T-branches 4 and 5 to form a compact device 1 with a small number of necessary mechanical connections. The electric motor 25 and the pump impeller 3 are caulked to the housing 14 of the pump 3 using the gasket 27 and mechanically fastened using the collar 28, which is fixed to the device 1 body by standard screws. On the device 1 body, there is also shown the base 30 of the temperature sensor 20 on the secondary supply pipe and the base 29 of the temperature sensor 22 on the secondary return pipe. The control unit 6 is integrated into the electric motor 25. At an accessible location on the electric motor 25, the maximum required heat flow selector 32 is located. The required exchanger heat output of 0 to 100% is communicated digitally via data line 31 or by an analog signal, current or voltage, via line 33 of the heat flow reference. The cable 34 is a combination of the device power cable and the data line 31 through which the device communicates with the master computer and/or other devices in one heating network.

[0023] FIG. 3 shows a cross-section of the device 1 body, where the first T-branch 4, i.e. the connection of the secondary supply pipe 13 to the primary inlet 9 is better visible. Further, the second T-branch 5, i.e., the connection of the secondary return pipe 19 to the primary outlet 10 is visible as well.

INDUSTRIAL APPLICABILITY

[0024] In particular, the device for heat exchanger output control in a one-pipe heating network of the present invention finds its use in heating systems of buildings and in controlling industrial thermal processes.