JP6848114B1 - Heat supply control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately control a transfer power when an indirect receiving part and a direct receiving part coexist as a part for receiving heat energy in a piping system. SOLUTION: In a heat supply control system 10, a heat medium is circulated and supplied by a pump 14 (heat medium transporting means), and heat energy is supplied via heat exchangers 16A and 16B as a portion for receiving heat energy from the heat medium. A heat supply control system for supplying heat to a piping system 12 in which an indirect receiving unit 22 that receives heat and a direct receiving unit 20 that directly receives heat energy from a heat medium coexist, and is provided in the indirect receiving unit 22. The control unit 30 for driving the pump 14 is provided based on the temperature control valve opening degree information obtained from the temperature control valves 40A and 40B and the heat medium information obtained from the heat medium flow path in the direct receiving unit 20. [Selection diagram] Fig. 1

Description

The present invention relates to a heat supply control system used in a thermal energy network.

A water supply control system is disclosed in which cold / hot water generated by a heat source machine is sent to a plurality of heat exchangers, and the thermal energy of the cold / hot water is supplied to a plurality of heat utilization devices via the heat exchangers (Patent Document 1). reference). In this document, the opening degree of the flow rate adjusting valve is adjusted based on the difference between the temperature difference between the inlet temperature and the outlet temperature of the passage for sending water to the heat exchanger and the target temperature difference, and the opening degree reaches a predetermined value. A technique for increasing the number of revolutions of a pump when there is a flow control valve is disclosed.

Japanese Unexamined Patent Publication No. 2011-242001

However, in the above-mentioned conventional example, it is assumed that only the indirect receiving part that receives the heat energy via the heat exchanger is provided in the piping system as the part that receives the heat energy. It is not assumed that there will be a mixture of direct receiving parts that receive heat energy directly from the heat medium without going through a heat exchanger.

An object of the present invention is to appropriately control the transport power when an indirect receiving part and a direct receiving part coexist as a part for receiving heat energy in the piping system.

The heat supply control system according to the first aspect includes an indirect receiving unit that receives heat energy via a heat exchanger as a portion where the heat medium is circulated and supplied by the heat medium transporting means and receives the heat energy from the heat medium. A heat supply control system for supplying heat to a piping system in which a direct receiving portion that directly receives heat energy from the heat medium is mixed, and a temperature obtained from a temperature control valve provided in the indirect receiving portion. adjusting valve opening information, and on the basis of the heating medium information obtained from the flow path of the heating medium in the direct receiving portion, have a control unit for driving the heat medium conveying device, the heating medium in the direct receiving portion The information is the differential pressure adjusting valve opening degree information obtained from the differential pressure adjusting valve provided in the direct receiving portion, and the controlling unit uses the temperature adjusting valve opening degree information and the differential pressure adjusting valve opening degree information. Based on this, the heat medium conveying means is driven so that both the opening degree of the temperature adjusting valve and the opening degree of the differential pressure adjusting valve are within the permissible range .

In this heat supply control system, in a piping system in which an indirect receiving part and a direct receiving part coexist as a part for receiving heat energy, the temperature control valve opening degree information obtained from the temperature control valve of the indirect receiving part and the direct receiving part The control unit drives the heat medium transporting means based on the heat medium information obtained from the heat medium flow path. As a result, the transport power can be appropriately controlled while responding to the heat demand.

Further, in this heat supply control system, the control unit has an allowable range of both the opening degree of the temperature adjusting valve and the opening degree of the differential pressure adjusting valve based on the temperature adjusting valve opening information and the differential pressure adjusting valve opening information. Drive the heat transfer means so that it fits inside. As a result, the transport power can be appropriately controlled while responding to the heat demand.

In the second aspect, in the heat supply control system according to the first aspect, the upper threshold value of the allowable opening range of the temperature control valve is Imax, the lower threshold value is Imin, and the differential pressure control valve is allowed to open. When the upper threshold value of the degree range is Dmax and the lower threshold value is Dmin, the temperature control valve opening information of the temperature control valve opening degree information is equal to or higher than the upper threshold value Imax, or the differential pressure control valve opening degree information is the lower threshold value Dmin. When there is the following differential pressure adjusting valve, the control unit raises the output of the heat medium conveying means, and the temperature adjusting valve opening degree information is the lower threshold value Imin or less, or the differential pressure adjusting. When there is the differential pressure adjusting valve whose valve opening information is equal to or higher than the upper threshold value Dmax, the control unit lowers the output of the heat medium conveying means.

In this heat supply control system, when there is a temperature control valve whose temperature control valve opening information is equal to or higher than the upper threshold Imax or a differential pressure control valve whose differential pressure control valve opening information is equal to or lower than the lower threshold Dmin, the control unit heats up. Increase the output of the medium transport means. On the other hand, when there is a temperature control valve whose temperature control valve opening information is the lower threshold value Imin or less, or a differential pressure control valve whose differential pressure control valve opening information is the upper threshold value Dmax or more, the control unit outputs the heat medium conveying means. Lower.

In the third aspect, in the heat supply control system according to the second aspect, the opening degree of the temperature control valve is set to an upper range Iup close to the upper threshold value Imax within the allowable opening degree range, and the differential pressure is set. When the lower range Ddw close to the lower threshold value Dmin within the allowable opening range is set for the opening degree of the adjusting valve, the temperature adjusting valve opening degree information is in the upper range Iup, or the differential pressure. The control unit controls the output of the heat medium conveying means so that the differential pressure adjusting valve having the adjusting valve opening degree information in the lower range Ddw exists.

In this heat supply control system, the control unit determines that the temperature control valve opening information is within the allowable opening range and the temperature control valve opening information is close to the upper threshold Imax and is in the upper range Iup, or the differential pressure control valve opening information is the allowable opening. The output of the heat medium conveying means is controlled so that the differential pressure adjusting valve in the lower range Ddw close to the lower threshold Dmin within the range exists. As a result, the transport power can be reduced within the allowable opening range of the temperature adjusting valve opening information or within the allowable opening range of the differential pressure adjusting valve opening information. The temperature control valve opening degree information may be in the upper range Iup, and the differential pressure control valve opening degree information may be in the lower range Ddw.

According to the present invention, when the indirect receiving part and the direct receiving part coexist as a part for receiving heat energy in the piping system, the transport power can be appropriately controlled.

It is a block diagram which shows the structure of the heat supply control system which concerns on this embodiment. It is a flow chart which shows an example of the control flow in the heat supply control system which concerns on this embodiment. It is a diagram which shows the permissible opening range of a temperature control valve, the upper range Iup which is close to the upper threshold Imax within the range, the permissible opening range of a differential pressure control valve, and the lower range Ddw which is close to the lower threshold Dmin within that range. ..

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The components shown with the same reference numerals in each drawing mean that they are the same or similar components. In addition, duplicate description and reference numeral in the embodiment described below may be omitted.

(Piping system)
In FIG. 1, a heat medium (not shown) is circulated and supplied to the piping system 12 through the piping 18 by a pump 14 as an example of the heat medium transporting means. The piping system 12 includes, for example, a refrigerating facility 24 for cooling the heat medium, a pump 14 for supplying the cooled heat medium to consumers 31, 32, and 33, a pump 14 for driving the pump 14, and a discharge of the pump 14. An inverter 28 for changing the amount is provided. The temperature of the heat medium is, for example, constant by the refrigerating equipment 24. Further, in the piping system 12, as a portion for receiving the heat energy from the heat medium, an indirect receiving portion 22 for receiving the heat energy via the heat exchangers 16A and 16B and a direct receiving portion 22 from the heat medium without passing through the heat exchanger. A direct receiving unit 20 that receives heat energy is mixed.

The indirect receiving unit 22 and the direct receiving unit 20 are provided for each consumer. As an example, the customer 31 is provided with a direct receiving unit 20, the customer 32 is provided with an indirect receiving unit 22, and the customer 33 is provided with a direct receiving unit 20 and an indirect receiving unit 22. The fact that the direct receiving unit 20 is provided can be rephrased as adopting the direct receiving method. Similarly, the fact that the indirect receiving unit 22 is provided can be rephrased as adopting the indirect receiving method. A known structure can be applied to the direct receiving unit 20 and the indirect receiving unit 22.

In the direct receiving unit 20 of the consumer 31, the air conditioning load 41 is directly connected to the pipe 18, and a part of the heat medium passing through the pipe 18 is supplied to the air conditioning load 41 to enter and exit the air conditioning load 41. ing. That is, the air conditioning load 41 is also a part of the heat medium circulation path. Further, a differential pressure adjusting valve 46A is provided in the direct receiving portion 20 of the customer 31. The differential pressure adjusting valve 46A is provided so as to bypass connect the upstream side and the downstream side of the connection position of the air conditioning load 41 in the pipe 18. Similarly, in the direct receiving portion 20 of the customer 33, the air conditioning load 43 is directly connected to the pipe 18, and the differential pressure adjusting valve 46B is provided.

Taking the differential pressure regulating valve 46A as an example, the inlet of the differential pressure regulating valve 46A is located on the upstream side of the connection position of the air conditioning load 41, and the outlet of the differential pressure regulating valve 46A is located on the downstream side of the connecting position of the air conditioning load 41. positioned. When the differential pressure between the inlet pressure and the outlet pressure exceeds the set pressure, the main valve is opened and the differential pressure is reduced to the set pressure. At this time, the flow rate of the heat medium supplied to the air conditioning load 41 decreases. Conversely, when the differential pressure between the inlet pressure and the outlet pressure falls below the set pressure, the main valve is throttled and the differential pressure is raised to the set pressure. At this time, the flow rate of the heat medium supplied to the air conditioning load 41 increases. As described above, the differential pressure adjusting valve 46A is configured to be able to keep the differential pressure between the inlet pressure and the outlet pressure constant, thereby adjusting the flow rate of the heat medium supplied to the air conditioning load 41.

In the indirect receiving unit 22 of the consumer 32, the heat medium is configured to circulate in the pipe 34 on the air conditioning load 42 side, and the transfer of heat energy between the heat medium of the pipe 18 and the heat medium of the pipe 34 is heat exchange. It is designed to be performed in the vessel 16A. That is, the pipe 18 and the pipe 34 form a circulation system independent of each other so that the heat medium of the pipe 18 does not pass through the air conditioning load 42. Further, the indirect receiving portion 22 of the customer 32 is provided with a temperature control valve 40A. The temperature control valve 40A is provided in the pipe 18. The indirect receiving portion 22 of the consumer 33 is also configured so that the heat medium circulates in the pipe 36 on the air conditioning load 44 side, and the transfer of heat energy between the heat medium of the pipe 18 and the heat medium of the pipe 36 is heat. It is designed to be performed by the exchanger 16B. The temperature control valve 40B is also provided in the indirect receiving portion 22 of the customer 33. The temperature control valve 40B is provided in the pipe 18. Increasing the opening degree of the temperature control valve 40A increases the flow rate of the heat medium supplied to the air conditioning load 42. Similarly, when the opening degree of the temperature control valve 40B is increased, the flow rate of the heat medium supplied to the air conditioning load 44 increases.

The air conditioning loads 41, 42, 43, and 44 are heat utilization devices such as air conditioners.

(Heat supply control system)
The heat supply control system 10 according to the present embodiment is a system for supplying heat to consumers 31, 32, 33 through the piping system 12, and has a control unit 30. The control unit 30 pumps based on the temperature control valve opening degree information obtained from the temperature control valves 40A and 40B provided in the indirect receiving unit 22 and the heat medium information obtained from the heat medium flow path in the direct receiving unit 20. It is, for example, an electronic control unit that drives 14. The control unit 30 determines the output of the transfer power of the pump 14 and drives the pump 14 via the inverter 28. By using the inverter 28, the rotation speed of the motor of the pump 14 can be changed, and the discharge amount of the pump 14 can be changed.

The heat medium information in the direct receiving unit 20 is, for example, differential pressure adjusting valve opening degree information obtained from the differential pressure adjusting valves 46A and 46B provided in the direct receiving unit 20. In this case, the control unit 30 allows both the opening degree of the temperature adjusting valves 40A and 40B and the opening degree of the differential pressure adjusting valves 46A and 46B based on the temperature adjusting valve opening information and the differential pressure adjusting valve opening information. The pump 14 may be driven so as to be within the range.

To give a specific example, in FIG. 3, the upper threshold value of the allowable opening range of the temperature control valves 40A and 40B (FIG. 1) is Imax, the lower threshold value is Imin (FIG. 3 (A)), and the difference. The upper threshold value of the allowable opening range of the pressure regulating valves 46A and 46B (FIG. 1) is Dmax, and the lower threshold value is Dmin (FIG. 3B). When there are temperature control valves 40A and 40B whose temperature control valve opening information is equal to or higher than the upper threshold Imax, or differential pressure control valves 46A and 46B whose differential pressure adjustment valve opening information is equal to or lower than the lower threshold Dmin, FIG. The indicated control unit 30 increases the output of the pump 14. On the contrary, when there are temperature control valves 40A and 40B whose temperature control valve opening information is equal to or lower than the lower threshold value Imin, or differential pressure control valves 46A and 46B whose differential pressure control valve opening information is equal to or higher than the upper threshold value Dmax. 30 causes the output of the pump 14 to decrease.

In FIG. 1, for example, when the temperature control valve opening degree information from the temperature control valve 40A is equal to or higher than the upper threshold value Imax, the air conditioning load 42 requires a large amount of heat energy. Therefore, by increasing the output of the pump 14, the supply of thermal energy can be increased, and the opening degree of the temperature control valve 40A can be reduced accordingly. The circles in FIG. 3 indicate the opening degree of each adjusting valve.

Further, for example, when the differential pressure adjusting valve opening degree information from the differential pressure adjusting valve 46A is equal to or less than the lower threshold value Dmin, the differential pressure between the inlet pressure and the outlet pressure of the differential pressure adjusting valve 46A is smaller than the predetermined pressure. At this time, the air conditioning load 41 requires a large amount of heat energy. Therefore, by increasing the output of the pump 14, the differential pressure can be increased and the opening degree of the differential pressure adjusting valve 46A can be increased.

Next, for example, when the temperature control valve opening degree information from the temperature control valve 40A is equal to or less than the upper threshold value Imin, the heat energy required by the air conditioning load 42 is small. Therefore, by lowering the output of the pump 14, the supply of thermal energy can be reduced, and the opening degree of the temperature control valve 40A can be increased accordingly.

Further, for example, when the differential pressure adjusting valve opening degree information from the differential pressure adjusting valve 46A is equal to or higher than the upper threshold value Dmax, the differential pressure between the inlet pressure and the outlet pressure of the differential pressure adjusting valve 46A is larger than the predetermined pressure. At this time, the heat energy required by the air conditioning load 41 is small. Therefore, by lowering the output of the pump 14, the differential pressure can be reduced and the opening degree of the differential pressure adjusting valve 46A can be reduced.

By doing so, the opening degree of the temperature adjusting valves 40A and 40B can be accommodated between the upper threshold value Imax and the lower threshold value Imin of the allowable opening degree range, and the differential pressure adjusting valves 46A and 46B are opened. The degree can be kept between the upper threshold value Dmax and the lower threshold value Dmin in the allowable opening range.

Further, in consideration of improving accuracy in order to improve energy saving, the output of the pump 14 is controlled within a certain range, and the opening degree of the temperature control valves 40A and 40B is close to the upper threshold value Imax within the allowable opening degree range. The output of the pump 14 may be controlled by setting the upper range Iup and setting the lower range Ddw of the differential pressure adjusting valves 46A and 46B close to the lower threshold value Dmin within the allowable opening range. The control unit 30 has the temperature control valves 40A and 40B whose temperature control valve opening information is in the upper range Iup, or the differential pressure control valves 46A and 46B whose differential pressure control valve opening information is in the lower range Ddw. , Control the output of the pump 14. The temperature control valve opening degree information may be in the upper range Iup, and the differential pressure control valve opening degree information may be in the lower range Ddw.

(Action)
This embodiment is configured as described above, and its operation will be described below. In FIG. 1, the heat supply control system 10 according to the present embodiment has a temperature control valve 40A of the indirect receiving unit 22 in a piping system 12 in which an indirect receiving unit 22 and a direct receiving unit 20 coexist as a portion for receiving heat energy. The control unit 30 drives the pump 14 based on the temperature control valve opening degree information obtained from 40B and the heat medium information obtained from the heat medium flow path in the direct receiving unit 20. Specifically, the control unit 30 determines both the opening degree of the temperature adjusting valves 40A and 40B and the opening degree of the differential pressure adjusting valves 46A and 46B based on the temperature adjusting valve opening degree information and the differential pressure adjusting valve opening degree information. The pump 14 is driven so that the temperature is within the permissible range.

Explaining an example of the control flow according to the flow chart of FIG. 2, in step S1, the opening degree information of each temperature adjusting valve, specifically, the temperature adjusting valve opening degree information and the differential pressure adjusting valve opening degree information are collected. Will be done. Based on the collected data, the control unit 30 (FIG. 1) makes various determinations and controls the output of the pump 14 (FIG. 1). First, in step S2, it is determined whether or not there are temperature control valves 40A and 40B whose temperature control valve opening degree information is equal to or higher than the upper threshold value Imax. If this determination is YES, the output of the pump 14 (FIG. 1) is increased in step S8. If the determination in step S2 is NO, the process proceeds to step S3.

In step S3, it is determined whether or not there are differential pressure adjusting valves 46A and 46B whose differential pressure adjusting valve opening degree information is equal to or less than the lower threshold value Dmin. If this determination is YES, the output of the pump 14 (FIG. 1) is increased in step S8. If the determination in step S3 is NO, the process proceeds to step S4.

In step S4, it is determined whether or not there are temperature control valves 40A and 40B (FIG. 1) whose temperature control valve opening information is equal to or lower than the upper threshold value Imin. If this determination is YES, the output of the pump 14 (FIG. 1) is reduced in step S9. If the determination in step S4 is NO, the process proceeds to step S5.

In step S5, it is determined whether or not there are differential pressure adjusting valves 46A and 46B whose differential pressure adjusting valve opening degree information is equal to or higher than the upper threshold value Dmax. If this determination is YES, the output of the pump 14 (FIG. 1) is reduced in step S9. If the determination in step S5 is NO, the process proceeds to step S6.

In step S6, the temperature control valves 40A and 40B (FIG. 1) whose temperature control valve opening information is in the upper range Iup, or the differential pressure control valves 46A and 46B (FIG. 1) whose differential pressure control valve opening information is in the lower range Ddw. It is determined whether or not there is 1). If this determination is NO, the output of the pump 14 (FIG. 1) is reduced in step S9. If the determination in step S6 is YES, the process proceeds to step S7.

In step S7, it is determined whether or not there is a system stop instruction. If this determination is YES, the control ends. If this determination is NO, the process returns to step S1.

In the present embodiment, as shown in FIG. 3, the temperature control valves 40A and 40B (FIG. 1) whose temperature control valve opening information is equal to or higher than the upper threshold Imax, or the differential pressure control valve opening information is equal to or lower than the lower threshold Dmin. When there are differential pressure adjusting valves 46A and 46B (FIG. 1), the control unit 30 increases the output of the pump 14. On the other hand, when there are temperature control valves 40A and 40B whose temperature control valve opening information is equal to or lower than the lower threshold value Imin, or differential pressure control valves 46A and 46B whose differential pressure control valve opening information is equal to or higher than the upper threshold value Dmax, the control unit 30 Reduces the output of the pump 14. Further, the control unit 30 determines that the temperature control valve opening information is within the allowable opening range and the temperature control valves 40A and 40B in the upper range Iup close to the upper threshold Imax, or the differential pressure control valve opening information is within the allowable opening range. The output of the pump 14 is controlled so that the differential pressure regulating valves 46A and 46B in the lower range Ddw close to the lower threshold value Dmin are present. As a result, the transport power can be reduced within the allowable opening range of the temperature adjusting valve opening information and within the allowable opening range of the differential pressure adjusting valve opening information.

As described above, according to the present embodiment, when the indirect receiving portion 22 and the direct receiving portion 20 coexist as a portion for receiving heat energy in the piping system 12, the transport power is appropriately controlled while responding to the heat demand. can do.

[Other Embodiments]
Although an example of the embodiment of the present invention has been described above, the embodiment of the present invention is not limited to the above, and other than the above, various modifications can be made within a range not deviating from the gist thereof. Of course there is.

As the heat medium information obtained from the flow path of the heat medium, the differential pressure adjusting valve opening degree information obtained from the differential pressure adjusting valves 46A and 46B is mentioned, but the heat medium information is not limited to this. For example, the front-rear differential pressure of the terminal air conditioning load, the bypass flow rate of the differential pressure adjusting valve, the valve opening information of the terminal air conditioning load, and the like may be used as heat medium information.

10 Heat supply system 12 Piping system 14 Pump (heat medium transfer means)
16A Heat exchanger 16B Heat exchanger 20 Direct receiving part 22 Indirect receiving part 30 Control part 40A Temperature control valve 40B Temperature control valve 46A Differential pressure control valve 46B Differential pressure control valve

Claims (2)

The heat medium is circulated and supplied by the heat medium transporting means, and the indirect receiving part that receives the heat energy via the heat exchanger and the direct receiving part that directly receives the heat energy from the heat medium are the parts that receive the heat energy from the heat medium. It is a heat supply control system for supplying heat to the piping system where the receiving part coexists.
The heat medium transporting means is driven based on the temperature control valve opening degree information obtained from the temperature control valve provided in the indirect receiving part and the heat medium information obtained from the heat medium flow path in the direct receiving part. Has a control unit
The heat medium information in the direct receiving portion is information on the opening degree of the differential pressure adjusting valve obtained from the differential pressure adjusting valve provided in the direct receiving portion.
Based on the temperature control valve opening degree information and the differential pressure control valve opening degree information, the control unit ensures that both the temperature control valve opening degree and the differential pressure control valve opening degree are within the permissible range. the heat medium conveying means is driven in,
The temperature control valve is a valve in which the opening degree increases as the thermal energy requirement at the indirect receiving portion increases, and the opening degree decreases as the thermal energy requirement at the indirect receiving portion decreases.
In the differential pressure adjusting valve, the main valve is opened when the differential pressure between the inlet pressure and the outlet pressure becomes equal to or higher than the set pressure, the differential pressure is reduced to the set pressure, and the differential pressure between the inlet pressure and the outlet pressure is reduced. When the pressure drops below the set pressure, the main valve is throttled, the differential pressure is raised to the set pressure, and the differential pressure between the inlet pressure and the outlet pressure is kept constant.
When the upper threshold value of the allowable opening range of the temperature control valve is Imax and the lower threshold value is Imin, and the upper threshold value of the allowable opening range of the differential pressure control valve is Dmax and the lower threshold value is Dmin.
Thermal energy is required when there is the temperature control valve whose temperature control valve opening information is equal to or higher than the upper threshold Imax, or the differential pressure control valve whose differential pressure control valve opening information is equal to or lower than the lower threshold Dmin. Therefore, the control unit raises the output of the heat medium transporting means and increases the supply of heat energy to reduce the opening degree of the temperature adjusting valve and the opening degree of the differential pressure adjusting valve. Try to make it bigger
The heat required when there is the temperature control valve whose temperature control valve opening information is the lower threshold Imin or less, or the differential pressure control valve whose differential pressure control valve opening information is the upper threshold Dmax or more. Since the energy is small, the control unit lowers the output of the heat medium transporting means to reduce the supply of heat energy, thereby increasing the opening degree of the temperature adjusting valve and opening degree of the differential pressure adjusting valve. A heat supply control system that makes it smaller. For the opening degree of the temperature adjusting valve, an upper threshold Iup close to the upper threshold value Imax within the allowable opening degree range is set, and for the opening degree of the differential pressure adjusting valve, the lower threshold value Dmin within the allowable opening degree range is set. When the near lower range Ddw is set,
The control unit has the control unit so that the temperature control valve whose temperature control valve opening information is in the upper range Iup or the differential pressure control valve whose differential pressure control valve opening information is in the lower range Ddw exists. The heat supply control system according to claim 1 , wherein the output of the heat medium conveying means is controlled.

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