JPH06187013A - Heat source controller - Google Patents

Abstract

PURPOSE:To attain a precise heat source operation control, and to attain an efficient operation while reducing an energy loss by monitoring the fluctuation of an actual thermal storage amount against a thermal storage amount transition plan, and immediately correcting a heat production plan and operating a heat source operation when a deviation is generated. CONSTITUTION:A heat load predicting part 7 predicts the hour transition of a heat load amount per a day, and a thermal storage amount transition planning part 8 plans the hour transition of the thermal storage amount necessary for facilitating a countermeasure to it. Then, a heat production planning part plans a heat reproduction for storing the thermal storage amount matched with the thermal storage amount transition plan in a thermal storage layer 1, based on a corresponding relation between the transition of the predicted head load amount and the transition of the terminal storage amount. A heat production plan correcting part always compares the thermal storage amount detected by a thermal storage amount detecting part with the thermal storage amount plan value, and corrects the heat production plan according to the deviation. Then, a head source operation control part 11 operates the operation control of a heat source based on the head production plan and a correcting command. Thus, the precise heat source operation control can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat source controller for controlling the operation of a heat source having a heat storage tank.

[0002]

2. Description of the Related Art Conventionally, a heat source control device for controlling the operation of a heat source facility having a heat storage tank such as a building facility predicts a heat load for one day, and secures a heat storage amount corresponding to the heat load prediction in the heat storage tank. Thus, the operation of the heat source is planned, and the operation control of the heat source is performed according to the plan.

[0003]

However, the actual heat load often deviates from the heat load prediction due to the abnormal heat load due to the weather. However, in the conventional heat source control device, such a prediction error occurs. However, there was a problem that it was not equipped with a flexible correction function, and it was not possible to control as desired in response to the actual heat load. In addition, there is a heat source control device that performs heat source control while correcting the load prediction and the heat source operation plan in order to cope with the misprediction.However, in such a conventional heat source control device, it is possible to correct the misprediction. Since the required calculation load becomes large, correction processing of a long time span, for example, every hour, is performed, and there is a problem that fine control is not sufficient and energy loss is large.

The present invention has been made in view of the above-mentioned problems of the prior art. Even if the prediction of the heat load is off, the correction operation can be finely performed, and the energy loss is small.
An object of the present invention is to provide a heat source control device capable of efficiently controlling a heat source.

[0005]

The present invention relates to a heat source control device for controlling the amount of heat storage of a heat source provided with a heat storage tank.
A heat load prediction unit that predicts the time change of the heat load amount of the day, and a heat storage amount change planning unit that plans the time change of the heat storage amount necessary to correspond to the change of the heat load amount that the heat load prediction unit predicts. ,
Heat production to store the heat storage amount that matches the heat storage amount transition plan in the heat storage tank based on the correspondence relationship between the transition of the predicted heat load amount of the heat load estimation unit and the transition of the heat storage amount planned by the heat storage amount transition planning unit. The heat production planning unit that makes a plan, the heat storage amount detection unit that detects the actual heat storage amount of the heat storage tank, the actual heat storage amount that the heat storage amount detection unit detects, and the heat storage amount planned value that the heat storage amount transition planning unit has planned. The heat production plan correction unit that constantly compares the heat production plan established by the heat production planning unit according to the deviation, and the heat production plan established by the heat production planning unit and the correction command of the heat production plan correction unit. And a heat source operation control unit for executing heat production of the heat source based on the above.

[0006]

In the heat source control apparatus of the present invention, the heat load predicting unit predicts the time transition of the heat load amount of one day, and the heat storage required to correspond to the transition of the heat load amount predicted by the heat load estimating unit. The time transition of the amount is planned by the heat storage amount change planning unit, and based on the correspondence relationship between the change of the predicted heat load amount and the change of the heat storage amount,
The heat production planning section establishes a heat production plan for storing a heat storage amount that matches the heat storage amount transition plan in the heat storage tank.

Then, the heat production plan correction unit constantly compares the actual heat storage amount detected by the heat storage amount detection unit with the heat storage amount planned value planned by the heat storage amount transition planning unit, and according to the deviation, the heat production plan. The heat source operation control unit controls the heat source based on the heat production plan established by the heat production planning unit and the heat generation plan established by the heat production planning unit and the correction instruction of the heat production plan correction unit.

In this manner, the actual fluctuation of the heat storage amount is monitored with respect to the heat storage amount transition plan, and when a deviation occurs, the heat production plan is immediately corrected and the heat source operation is performed to perform a fine heat source operation control. None, reduce energy loss and perform efficient heat source control.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a functional block diagram of a heat source controller for storing cold heat in a heat storage tank by a refrigerator and supplying it to a heat load such as an air conditioner as one embodiment of the present invention. With respect to the heat storage tank 1 which is partitioned and in which water, which is a heat medium, circulates in each block,
The heat loads 2, 2, ... Group take in the heat medium from the low temperature side 1a, consume the cold heat, and recirculate it to the high temperature side 1b. In addition, the refrigerators 3, 3, are used as heat sources for storing cold heat by cooling the heat medium in the heat storage tank 1.
.. are provided so that the heat medium is taken in from the high temperature side 1b of the heat storage tank 1 to be cooled, and is returned to the low temperature side 1a.

The heat sources, which are the refrigerators 3, 3, ...
A heat source controller 4 is provided to control the operation of the group.

The heat source control device 4 includes a sensor group as
Heat load 2, 2, ... A heat quantity sensor 5 for detecting the heat load quantity of the group, and a water temperature sensor 6, 6, for detecting the heat storage quantity of the heat storage tank 1 are provided and these detection signals are provided. It is designed to be entered.

The internal configuration of the heat source control device 4 is such that a load predictor 7 for calculating the past input to the present of the heat amount sensor 5 and predicting the temporal change of the heat load amount for the next day, and a load predictor. A heat storage amount transition planning unit 8 that plans the time transition of the heat storage amount necessary to correspond to the transition of the heat load amount predicted by the unit 7;
In order to store the heat storage amount that matches the heat storage amount transition plan in the heat storage tank 1 based on the correspondence relationship between the transition of the predicted heat load amount of the load estimation unit 7 and the transition of the heat storage amount planned by the heat storage amount transition planning unit 8. Operation planner 9 that makes an operation plan for the refrigerators 3, 3, ...
, And the heat storage amount calculation unit 10 for obtaining the actual heat storage amount of the heat storage tank 1 based on the inputs from the water temperature sensors 6, 6, ..., And the heat storage amount planned value and heat storage amount calculation planned by the heat storage amount transition planning unit 8. The actual heat storage amount calculated by the unit 10 is constantly compared, and the operation plan created by the operation plan unit 9 is corrected according to the deviation to make a final operation plan, and the refrigerators 3, 3, ... A control execution unit 11 that executes operation control is provided.

Next, the operation of the heat source control device having the above configuration will be described.

The load predicting unit 7 stores the input from the heat quantity sensor 5 and predicts the heat load transition of the control target day by referring to the time transition of the past heat load as shown in FIG. 3 (a). Stand up. That is, the heat load transition prediction of each control target day is made from the heat load transition of one day in the past showing the same heat load transition as the control target day. This is usually the heat load change on the same weekday one week before if it is a weekday, or the heat load change on the weekday one day before (Tuesday if it is Wednesday, Friday last week if it is Monday) Can be used to make a heat load change prediction for the current day, and if the day is a Saturday, last Saturday, and if it is a holiday, the recent heat load change can be made using the heat load change for the last Sunday or holiday. .

In the case of heat source control, the operation start calculation time of each day is set to 22:00 of the previous day and 22:00 of the current day.

The heat storage amount change planning unit 8 responds to the heat load prediction of the load predicting unit 7 as shown in FIG. 3C, and the heat storage tank 1 reaches 100 at 8:00 am when the heat consumption is started. % Of heat is accumulated and then heat consumption peaks at 10:
In the time zone of 00:00 to 15:00, the heat storage amount of almost 100% is maintained, and the heat storage amount is gradually reduced as the heat consumption is gradually reduced.
At 22:00, which is the end time, a transition plan is set so that it becomes almost 0.

Then, the operation planning unit 9 makes an operation plan necessary for storing the heat storage amount corresponding to the heat storage amount transition plan in the heat storage tank 1 as shown in FIG. 3 (b). In this case, at 8:00 am, the heat is stored by operating an appropriate number of the refrigerators 3, 3, ... Group during the time when midnight power can be used at midnight so that the heat storage amount becomes 100%. After the start-up time, which suddenly rises, the number of operating chillers 3, 3, ... Group is further increased so that the heat storage amount can be maintained at 100%, and the electric power company is requested to suppress the power consumption. The operation is stopped during the time period from 12:00 to 14:00, and then the appropriate number of refrigerators 3, 3, ... Are operated again to handle the heat consumption, and the operation is stopped at 17:00. It is planned to do.

The heat storage amount calculation unit 10 inputs a heat amount signal from the heat amount sensor 5, calculates the actual heat storage amount of the day at a constant cycle of, for example, every 5 minutes, and outputs it to the control execution unit 11.

Therefore, the control execution unit 11 initially controls the number of operating refrigerators 3, 3, ... In every same cycle in accordance with an operation command based on the heat production plan from the operation planning unit 9. However, there are many cases where the heat consumption by the heat load 2, 2, ... Group deviates from the prediction depending on the weather of the day and other factors. In that case, according to the flowchart shown in FIG. The necessary operation plan is revised every fixed period.

The heat load, the heat storage amount, the refrigerators 3, 3, ...
The amount of heat produced by a group is related to each other and is related by the equation: heat storage = ∫ (heat production) dt − ∫ (heat load) dt + heat storage initial value.

Now, at a certain time t1, FIG.
As shown by the broken line i, if the actual heat load is separated to the side larger than the predicted heat load, the transition of the integrated heat storage amount calculated by the heat storage amount calculation unit 10 is shown by the broken line ii in FIG. As shown in, it will be lower than the heat storage transition plan.
Therefore, the control execution unit 11 corrects the time when the number of operating the refrigerators 3, 3, ... Group of the heat source is increased to the time t2 ′ indicated by the broken line which is earlier than the originally scheduled time t2, and thereby the heat storage amount. The operation plan is modified to make up for the shortfall from the plan. If a shortage of heat storage amount is detected at the time when the number of operating units of the refrigerators 3, 3, ... Group is approaching, the number of operating units before the number of operating units is reduced by the time to compensate for the shortage. Corrective operation will be performed to extend the time.

The processing procedure of the above operation control will be described below with reference to the flowchart shown in FIG.

The current actual heat storage amount is calculated from the heat storage amount calculation unit 10, compared with the planned heat storage amount of the heat storage amount transition planning unit 8, and necessary corrections are added to the operation plan from the operation planning unit 9 according to the magnitude. While controlling the number of refrigerators 3, 3, ... (Step S1).

If the current heat storage amount differs from the planned heat storage amount within the allowable range ± b / 2, it is determined that the heat storage control is being performed smoothly as planned, and the operation as planned is continued. (Step S2).

However, in the comparison of step S1, if the current heat storage amount is smaller than the planned heat storage amount by exceeding the allowable range b / 2, the actual heat load is larger than predicted and the heat storage amount is insufficient. Since it has occurred, it is necessary to increase the amount of heat production, and the operating number of the refrigerators 3, 3, ... Group is increased from the initially planned number. Therefore, if the stop time of one refrigerator 3 is scheduled to arrive before the next control cycle, the stop time is extended to the next cycle for operation (steps S3, S4). On the contrary, if the stop time of one refrigerator 3 does not arrive before the next control cycle, one new refrigerator 3 is newly activated to increase the heat production (step S5). , S
6).

In addition, in the comparison in step S1, if the current heat storage amount is larger than the planned heat storage amount by exceeding the allowable range b / 2, the actual heat load is smaller than expected and the surplus heat storage amount is exceeded. Since it has occurred, it is necessary to reduce the amount of heat production in order to save energy, and the operating number of the refrigerators 3, 3, ... Group is reduced from the initially planned number. Therefore, if the start time of one refrigerator 3 is scheduled to arrive before the next control cycle, the start time is deferred until the next cycle (steps S7 and S8), and vice versa. If the activation time of one refrigerator 3 does not arrive within the control cycle of step 1, the one refrigerator 3 is immediately stopped to perform control to reduce the heat production amount (step S).
9, S10).

In this way, in order to control the heat production amount so that the current heat storage amount is always within the allowable range of ± b / 2 with respect to the planned heat storage amount, the control execution unit 11 causes the refrigerators 3, 3, ... The number of units is controlled so that energy is not wasted and efficient heat storage amount control is realized.

The present invention is not limited to the above embodiment, and in addition to the control of the number of refrigerators, fine control of heat production may be performed by power control if necessary. . Further, the control cycle is not particularly limited to every 5 minutes, and may be an appropriate cycle according to the actual device.

Further, in the above embodiment, the cold heat storage amount control by the refrigerator has been shown, but the invention can be equally applied to the warm heat storage amount control by the boiler or the heater. However, in the case of heat storage amount control of warm heat, contrary to the above embodiment,
If the current heat storage amount is smaller than the heat storage planned amount, the operation control of the heat source of the boiler or heater is performed so as to increase the heat production amount, and if the current heat storage amount is larger than the heat storage planned amount, the heat production amount is suppressed. It is necessary to control the operation of the heat source.

[0031]

As described above, according to the present invention, the heat load predicting unit predicts the time transition of the heat load amount per day, and corresponds to the transition of the heat load amount predicted by the heat load estimating unit. The heat storage amount change planning unit plans the time change of the heat storage amount required for the heat storage amount, and the heat storage amount that matches the heat storage amount transition plan in the heat storage tank based on the correspondence relationship between the change in the predicted heat load amount and the change in the heat storage amount. A heat production plan for storing heat is established by the heat production planning unit, and the actual heat storage amount detected by the heat storage amount detection unit and the heat storage amount planned value planned by the heat storage amount transition planning unit are constantly maintained by the heat production plan correction unit. The heat source operation control unit is compared with the heat production planning unit established by the heat production planning unit according to the deviation, and based on the heat production plan established by the heat production planning unit and the correction command of the heat production plan correcting unit. Control the operation of the heat source. The fluctuation of the heat storage amount of the heat source can be monitored, and if a deviation occurs, the heat production plan can be corrected immediately and the heat source operation can be carried out. You can control.

[Brief description of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention.

FIG. 2 is a heat load prediction of a load prediction unit in the above embodiment,
The graph which shows each of the heat production plan of an operation plan part, and the heat storage amount transition plan of a heat storage amount transition planning part.

FIG. 3 is a flowchart showing the control operation of the above embodiment.

[Explanation of symbols]

 1 Heat Storage Tank 2 Heat Load 3 Refrigerator 4 Heat Source Control Device 5 Heat Quantity Sensor 6 Water Temperature Sensor 7 Load Prediction Section 8 Heat Storage Quantity Transition Planning Section 9 Operation Planning Section 10 Heat Storage Calculation Section 11 Control Execution Section

Claims (1)

[Claims] 1. A heat source control device for controlling a heat storage amount of a heat source having a heat storage tank, wherein: a heat load predicting unit for predicting a temporal change of a heat load amount for one day; and a heat load predicting for the heat load predicting unit A heat storage amount change planning unit that plans a time change of the heat storage amount required to correspond to a change in the amount of heat, a change in the predicted heat load amount of the heat load prediction unit, and a heat storage amount that is planned by the heat storage amount change planning unit. Based on the corresponding relationship with the transition of the heat storage tank, a heat production planning unit that makes a heat production plan for storing a heat storage amount that matches the heat storage amount transition plan in the heat storage tank, and a heat storage unit that detects the actual heat storage amount of the heat storage tank. The amount detection unit, the actual heat storage amount detected by the heat storage amount detection unit and the heat storage amount planned value planned by the heat storage amount transition planning unit are constantly compared, and the heat production planning unit sets up according to the deviation. A heat production plan correction unit for correcting a heat production plan; and the heat production meter A heat source control device comprising: a heat production plan established by an image section; and a heat source operation control section for executing heat production of the heat source based on a correction command of the heat production plan correction section.