JPH05172383A - Control method of operation in ice heat accumulation system - Google Patents

Abstract

PURPOSE:To reduce the power consumption in the time zone of the power peak in the midsummer wherein power supply in extremely demanded by outputting ice manufactured in night in conformity with the time zone. CONSTITUTION:A heat storage tank 1, a main heat source machine 2 cooling water in the heat storage tank 1 and manufacturing ice, and a plurality of auxiliary heat source machines 3, 4 are provided, and the number of a plurality of the auxiliary heat source machines 3, 4 is controlled by correcting the calculation of predicted load by secondary flow-rate measurement. Whether or not ice is output according to load prediction is decided by monitoring the states of operation of the auxiliary heat source machines 3, 4 and correcting operation control, and the output of ice in the morning is stopped, an ice heat accumulation system is operated by a non-heat accumulation operation system only by the main heat source machine 2 and the auxiliary heat source machines 3, 4 and the ice heat accumulation system is controlled so that ice output as much as possible during the time of a power peak on the power peak.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention outputs ice produced at night according to the peak power hours in summer when power supply becomes strict, and can further reduce the power consumption during that time. The present invention relates to an operation control method in a heat storage system.

[0002]

2. Description of the Related Art Conventionally, when a heat source for air conditioning is manufactured, ice is manufactured by a refrigerator using inexpensive midnight power, stored in a heat storage tank, and the heat is used during the daytime. Heat storage systems are known. By utilizing the latent heat of ice, this system makes available cooling energy about 18 times that of water heat storage, and the size of the heat storage tank can be reduced to about 1/10 and low. Since the temperature of the water is used to reduce the power of the water pump, it is expected to be used especially in small and medium-sized buildings. In that case, the ice output control method includes a base operation method that outputs a fixed amount of ice every hour and a heat load peak cut operation method that predicts and controls the load. Regarding the latter, as shown in step 1, step 4 and step 5 of FIG. 3, the heat consumption is measured every 30 after the start of operation,
This is a method of calculating a predicted remaining load based on this and determining an operation pattern.

[0003]

By the way, although this is a method that contributes to leveling the power consumption of the air conditioning equipment in the building, the contracted power of the building is determined by the maximum value of the power consumption. It is necessary to consider the power consumption of the entire building, and there is a problem that the power peak at the city level occurs from 13:00 to 16:00 in midsummer.

At present, there are "load adjustment contracts" for large-scale buildings, in which power charges are easier if the power consumption is reduced during peak power hours, but in view of recent power circumstances, small-scale buildings and It is highly possible that similar tariff types will be adopted for households. Also, socially, it is necessary to actively reduce power consumption during peak power hours.

The present invention is to solve the above-mentioned problems, and outputs ice produced at night in accordance with the peak power hours in the summer when power supply becomes strict, and further reduces the power consumption during that time. It is an object of the present invention to provide an operation control method in an ice heat storage system that can be reduced.

[0006]

To this end, an operation control method for an ice heat storage system according to the present invention comprises a heat storage tank 1, a main heat source unit 2 for cooling water in the heat storage tank 1 to produce ice, and a plurality of heat source units. The auxiliary heat source units 3 and 4 are provided, and the number of auxiliary heat source units 3 and 4 is controlled by correcting the predicted load calculation by measuring the secondary side flow rate.
By monitoring the operation status of and correcting the operation control,
It is judged whether the ice is being output according to the load forecast, and when the power is at peak, the output of ice in the morning is stopped, and the main heat source unit 2 and the auxiliary heat source units 3 and 4 are operated only by the non-heat storage operation method, and the power peak is reached. It is characterized by controlling to output ice as much as possible during the time. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings for easy understanding, and the configurations of the present invention are not limited thereby.

[0007]

In the present invention, the predicted load calculation is corrected by measuring the secondary side flow rate, the number of auxiliary heat source units 3 and 4 is controlled, and the operation state of the auxiliary heat source units 3 and 4 is monitored to control the operation. Correction is performed to determine whether the ice is being output according to the load prediction, and even if the auxiliary heat source unit must be operated at full load due to load fluctuations, partial load operation is performed and as a result the load prediction is not met. When the ice is output, the auxiliary heat source units 3 and 4 are controlled to operate at full load, which makes it possible to output the ice more accurately.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an ice heat storage system according to the present invention. The ice heat storage system includes a heat storage tank 1, a main heat source device 2, a first auxiliary heat source device 3 and a second auxiliary heat source device 4, which are installed on the roof of a building, and first and second auxiliary heat source devices 3, Primary pumps 5, 6 that circulate water through 4,
A secondary pump 7 and an on-off valve 8 for supplying cold water or hot water produced by the heat storage tank 1, the first and second auxiliary heat source units 3 and 4 to the user side, and a fan coil unit 9 provided on each floor. To be done.

The heat storage tank 1 and the first and second auxiliary heat source units 3, 4 and the primary pumps 5, 6 are connected in parallel by pipes, and further, a main feed pipe 10, a branch pipe 11 and each fan coil unit 9 are connected. , Connected by the main return pipe 12. A temperature detector T is provided on the main feed pipe 10 and the main return pipe 12, and a temperature detector T is also provided on the inlet / outlet side of the heat storage tank 1 and the first and second auxiliary heat source units 3 and 4. Further, a flow meter Q is provided at the heat storage tank 1, the inlet sides of the first and second auxiliary heat source devices 3 and 4, and the main feed pipe 10.

The main heat source unit 2 comprises an air heat source heat pump type refrigerator, which cools the water in the heat storage tank 1 to produce ice in the summer and heats the water in the heat storage tank 1 to produce hot water in the winter. It is manufactured and is configured (not shown) to heat the circulating water by a heat pump using the hot water as a heat source. Similarly, the first and second auxiliary heat source machines 3 and 4 are air heat source heat pump type refrigerators, and cool water circulating in the pipes in summer and heat it in winter. The horsepower of the first auxiliary heat source unit 3 is
For example, the power of the second auxiliary heat source device 4 is set to be about the same as that of the main heat source device 2, and the horsepower of the second auxiliary heat source device 4 is set to about half of that of the first auxiliary heat source device 3, so that load changes can be handled by the combined operation of these heat source devices. In addition, the first auxiliary heat source device 3 is 100%, 75
%, 50% capacity switching is possible, and the second auxiliary heat source device 4 is capable of 100%, 50% capacity switching. The capacity of the heat source machine is not limited to this, and various combinations are possible.

FIG. 2 shows a block diagram of a controller for operating the ice heat storage system. Heat source monitor (CP
U) 13 outputs a heat storage permission signal, a peak shift command signal, a cooling / heating switching signal, etc. to the main heat source device 2, and outputs an operation command signal to the secondary pump 7. The main heat source device 2 receives the detection signals of the secondary side water supply temperature, return water temperature, and flow rate from the measurement panel 14. The main heat source device 2 outputs a cooling / heating switching signal and an operation command signal to the first and second auxiliary heat source devices 3 and 4. First
The second auxiliary heat source units 3 and 4 output operation command signals to the primary pumps 5 and 6, respectively. First auxiliary heat source machine 3
Transmits the operating state signals of 100%, 75%, 50% to the main heat source device 2, and the second auxiliary heat source device 4 transmits 100%, 50%.
% Operating state signal to the main heat source unit 2.

FIG. 3 is a flow chart showing an operation control method in the ice heat storage system of the present invention. After the operation is started, the heat consumption amount is measured every 30 in step S1, the predicted remaining load is calculated based on the heat consumption amount, and the operation pattern (primary) described later is determined in step S5. This operation pattern is a method that is usually used, but in the present invention, it is improved as follows. That is, in step S2, the secondary side flow rate is measured. In the case of a normal heat storage system, the air conditioning system is a variable flow rate system, and the secondary side flow rate corresponds to the air conditioning load. Therefore, in step S6, the predicted load calculation is corrected by measuring the secondary side flow rate, and the control of the number of auxiliary heat source units 3 and 4 is determined. In step S3, the operating states of the auxiliary heat source units 3 and 4 are monitored and the operation control is corrected, and it is determined in step S7 whether or not the ice is being output according to the load prediction.
Based on the determinations in S6 and S7, an operation pattern (secondary) for correcting the operation pattern (primary) in step S5 is determined.

In the present invention, the predicted load calculation is corrected by the secondary side flow rate measurement, the number of auxiliary heat source units 3 and 4 is controlled, and the operation state of the auxiliary heat source units 3 and 4 is monitored to control the operation. Correction is performed to determine whether the ice is being output according to the load prediction, and even if the auxiliary heat source unit must be operated at full load due to load fluctuations, partial load operation is performed and as a result the load prediction is not met. When the ice is output, the auxiliary heat source units 3 and 4 are controlled to operate at full load, thereby making it possible to output the ice more accurately.

Further, in the present invention, peak shift operation is prepared. This operation switches from normal predictive load control to peak shift operation during the season (July-August) when the power peak occurs. Light load season (June,
In September, normal cooling may be used because the cooling load for one day may be entirely covered with ice. The peak shift control is performed as follows.

The output of ice in the morning is stopped, and the operation is performed by the non-heat storage operation method using only the main heat source device 2 and the auxiliary heat source devices 3 and 4. However, in order to secure the indoor environment, the return temperature of the secondary side is monitored, and if the return temperature becomes high, the minimum ice output is performed.

Based on the predicted load calculation, it is controlled to output ice as much as possible during the peak power time (13:00 to 16:00). However, the minimum required ice is secured based on predictive load control so that the equipment capacity will not run out from 16:00 to 17:00.

The above peak shift operation will be specifically described with reference to FIG. FIG. A shows an operation pattern on a peak day during general planning, in which each heat source machine operates at full load all day. Fig. B shows the operation pattern on the actual peak day. Since each heat source machine is often planned with some margin, there is always a time zone for partial load operation,
It controls to leave ice in the afternoon by predicting load calculation. Therefore, as shown in FIG. C, the ice left in the afternoon in FIG. B is controlled so as to be concentrated and used in the power peak time period while using the normal predicted load calculation. Further, as shown in FIG. D, the ice output is forcibly stopped during the morning light load time, and the ice power is controlled to be consumed as much as possible during the power peak time. However, the minimum room temperature is guaranteed, and ice is output as necessary if the room temperature rises.

Next, the operation control method of the present invention will be specifically described. First, the cooling operation in which the heat storage component is included in the heat source will be described. Table 1 shows step S1 in FIG.
The operation pattern by the prediction residual load calculation in S4 and S5 is shown.

[0019]

[Table 1]

The operation pattern A is a pattern in which the heat storage tank 1, the main heat source device 2, and the first and second auxiliary heat source devices 3 and 4 are all operated, and calculation is performed every 30 minutes and 30 minutes after the start of the operation. It is adopted when the result determines that the operation of all heat sources is necessary.

The operation pattern B is a pattern in which the heat storage tank 1 and the first and second auxiliary heat source units 3 and 4 are operated. If the calculation result can cover the residual load with ice and the heat sources of the auxiliary heat source units 3 and 4. It is adopted when it is judged.

The operation pattern C is a pattern for operating the heat storage tank 1 and the first auxiliary heat source device 3, and is adopted when it is determined that the calculation result can cover the residual load with ice and the heat source of the auxiliary heat source device 3.

The operation pattern D is a pattern for operating the heat storage tank 1 and the second auxiliary heat source device 4, and is adopted when it is determined that the calculation result can cover the residual load with ice and the heat source of the auxiliary heat source device 4.

The operation pattern E is a pattern in which only the heat storage tank 1 is operated, and is adopted when it is determined that the calculation result can cover the residual load with the heat source of only ice.

The above operation pattern is such that the cooling capacity gradually decreases in the order of A to E, and when the heat source machine to be operated is in the unload state, the deicing temperature control valve is closed. Hold the ice in the heat storage tank 1.

Next, the operation pattern according to the secondary side flow rate and the state of the auxiliary heat source machine in step S8 of FIG. 3 will be described. The above operation patterns A to E are determined by the calculation of the estimated remaining load at 30-minute intervals.
This is the pattern that is primarily determined from the standpoint of the long-term span of the day, and is the method that is usually used. However, this operation pattern is used in order to cope with short-term fluctuations in the secondary side flow rate. The purpose is to determine whether the first and second auxiliary heat source units 3 and 4 are started or stopped.

FIG. 5 shows the control of the number of auxiliary heat source units 3 and 4 according to the secondary side flow rate in the operation pattern A. A basic pattern of operating both auxiliary heat source units 3 and 4 and only the auxiliary heat source unit 3 are operated. Pattern, a pattern in which only the auxiliary heat source device 4 is operated, and a pattern in which the auxiliary heat source devices 3 and 4 are both stopped are prepared. For example, the secondary side flow rate is increased to 700 (liter / min, or less). When omitted), the driving pattern shifts up from
It shifts up from 875 and up from 1050. The flow rate of the heat storage tank 1 is reduced with each shift to suppress an increase in ice output. On the contrary, when the secondary side flow rate decreases and reaches 875, the operation pattern is downshifted to, down from 700, down from 525. The flow rate of the heat storage tank 1 is increased with each shift to increase the ice output. The reason why the shift condition is changed when the secondary flow rate is decreased and when it is increased is to prevent hunting in which the shift is frequently performed.

FIG. 6 shows the control of the number of auxiliary heat source units 3 and 4 according to the secondary side flow rate in the operation pattern B. A basic pattern of operating both auxiliary heat source units 3 and 4 and only the auxiliary heat source unit 3 are operated. Pattern, a pattern in which only the auxiliary heat source device 4 is operated, and a pattern in which the auxiliary heat source devices 3 and 4 are both stopped are prepared. For example, when the secondary side flow rate decreases, points 625, 450, and 275 are sequentially provided. When the operation pattern is shifted to, and conversely the secondary side flow rate is increased, the operation pattern is controlled to be sequentially shifted to at points 450, 625, and 800.

FIG. 7 shows the control of the number of auxiliary heat source units 3 and 4 based on the secondary side flow rate in the operation pattern C. A basic pattern for operating only the auxiliary heat source unit 3 and a pattern for operating only the auxiliary heat source unit 4 are shown. And a pattern for stopping both the auxiliary heat source units 3 and 4 are prepared. For example, when the secondary flow rate decreases, the operation pattern is sequentially shifted to at points 450 and 275, and conversely the secondary flow rate decreases. Increase,
At points 450 and 625, the operation pattern is controlled to sequentially shift to.

FIG. 8 shows the control of the number of auxiliary heat source units 3 and 4 according to the secondary side flow rate in the operation pattern D. A pattern for operating only the auxiliary heat source unit 3 and a basic pattern for operating only the auxiliary heat source unit 4 are shown. And a pattern for stopping both the auxiliary heat source devices 3 and 4 are prepared. For example, when the secondary flow rate decreases, the operation pattern is sequentially shifted to at points 900 and 275, and conversely the secondary flow rate Increase,
At points 450 and 1075, the operation pattern is controlled to sequentially shift to. Peak shift operation is prepared for this operation pattern. As shown by the dotted line in the figure, the shift condition of the secondary side flow rate is increased by 100, and when the secondary side flow rate is decreased, the operation pattern is shifted from 1000 to When the secondary flow rate increases, the operation pattern is shifted from 1 to 175. This allows
When the secondary side flow rate increases at the peak of electric power, the shift of the heat storage tank is increased by delaying the shift, and the ice heat source can be intensively output.

FIG. 9 shows the control of the number of auxiliary heat source units 3 and 4 depending on the secondary side flow rate in the operation pattern E. A pattern for operating only the auxiliary heat source unit 3 and a pattern for operating only the auxiliary heat source unit 4 are shown. , A basic pattern for stopping both the auxiliary heat source devices 3 and 4 is prepared. For example, when the secondary flow rate decreases, the operation pattern is sequentially shifted to at points 900 and 725, and conversely, the secondary flow rate decreases. Increase,
At points 900 and 1075, the operation pattern is controlled to sequentially shift to. The peak shift operation is also prepared for this operation pattern. As shown by the dotted line in the figure, the shift condition of the secondary side flow rate is increased by 100, and when the secondary side flow rate is decreased, the operation pattern is changed from 1000 to 825. Shift, and when the secondary flow rate increases,
At 1000 and 1175, the operation pattern is shifted to and from. As a result, when the secondary side flow rate increases at the time of peak power, the shift is delayed to increase the heat storage tank flow rate, and it is possible to intensively output the ice heat source.

Next, the heating operation in which the stored heat is included in the heat source will be described. Table 2 shows the operation pattern.

[0033]

[Table 2]

The operation pattern F is a pattern in which the main heat source device 2, the first and second auxiliary heat source devices 3 and 4 are all stopped, and the hot water in the heat storage tank 1 is directly operated. Operate until the water temperature rises from 50 ° C to 40 ° C.

The operation pattern G is a heat storage tank 1, and the operation pattern G is a pattern in which the main heat source unit 2 is operated by using the hot water in the heat storage tank 1 as a heat source when the outside air temperature is 8 ° C. or less,
The heat storage tank is operated until the water temperature reaches approximately 10 ° C.

The above operating patterns F and G are determined by the calculation of the estimated remaining load at 30-minute intervals, and
This is a pattern that is primarily determined from the standpoint of a long-term span of the day, but in order to cope with short-term fluctuations in the secondary side flow rate, secondly, as in FIG. Second
It is determined whether the auxiliary heat source units 3 and 4 are started or stopped. However, as a switching condition, the return water temperature is 37 even if the flow rate does not change.
When the temperature drops below ℃, shift to the next higher stage.

Next, the cooling or heating operation in which the stored heat is not included in the heat source will be described. Table 3 shows the operation pattern.

[0038]

[Table 3]

The above operation pattern is such that the cooling capacity gradually decreases in the order of H to K, and when the defrosting of the heat storage tank 1 is completed during cooling, the outside air temperature is 8 ° C. or more during heating. Or, it is adopted under the condition that the water temperature of the heat storage tank is lowered to about 10 ° C. As described above, the horsepower of the first auxiliary heat source device 3 is set to be about the same as that of the main heat source device 2, and the horsepower of the second auxiliary heat source device 4 is set to about half of that of the first auxiliary heat source device 3. The combined operation of the machines makes it possible to cope with load fluctuations.

The operation pattern H is a pattern in which the main heat source unit 2 and the first and second auxiliary heat source units 3 and 4 are all operated, and the initial horsepower and total heat source horsepower are the total horsepower of the auxiliary heat source units 3 and 4. Is adopted when the heat source total horsepower becomes equal to the horsepower of the auxiliary heat source machines 3 and 4, and
Return water temperature is a return condition (cooling 14 ℃, heating 37
(° C) is reached, the operation pattern I is shifted to.

The operation pattern I is a pattern for operating the first and second auxiliary heat source machines 3 and 4, and is adopted when the total heat source horsepower is equal to or less than the total horsepower of the auxiliary heat source machines 3 and 4, and the heat source total horsepower is used. Becomes equal to the horsepower of the auxiliary heat source unit 3 and the return water temperature reaches the return condition, the operation pattern J is shifted.

The operation pattern J is a pattern in which only the first auxiliary heat source unit 3 is operated, and is adopted when the total heat source horsepower is equal to or lower than the horsepower of the auxiliary heat source unit 3, and the total heat source horsepower is the horsepower of the auxiliary heat source unit 4. When the return water temperature reaches the return condition, the operation pattern K is shifted.

The operation pattern K is a pattern in which only the second auxiliary heat source unit 4 is operated, and is adopted when the total heat source horsepower is equal to or less than the horsepower of the auxiliary heat source unit 4.

The control of the number of heat source units is performed by the automatic control of each heat source unit itself, the operating state as a result is monitored, and the number of heat source units is controlled according to the total horsepower.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, two auxiliary heat source machines are operated, but three or more auxiliary heat source machines are also applicable.

[0046]

As is apparent from the above description, according to the present invention, a heat storage tank, a main heat source machine for cooling water in the heat storage tank to produce ice, and a plurality of auxiliary heat source machines are provided. Provided, while performing the number control of the plurality of auxiliary heat source units by correcting the predicted load calculation by secondary side flow rate measurement, by monitoring the operating state of the auxiliary heat source unit and by correcting the operation control, It is judged whether the ice is being output according to the load forecast, and when the power is at peak, the output of ice is stopped in the morning, and it is operated by the non-heat storage operation method using only the main heat source unit and the auxiliary heat source unit. Since it is controlled to output as much as possible, it is possible to output the ice produced at night according to the time of the peak power peak in midsummer when the power supply becomes strict, and further reduce the power consumption during that time.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an ice heat storage system according to the present invention.

FIG. 2 is a block diagram of a control device for operating the ice heat storage system of FIG.

FIG. 3 is a flowchart showing an operation control method in the ice heat storage system of the present invention.

FIG. 4 is a diagram for explaining a peak shift operation according to the present invention.

FIG. 5 is a diagram for explaining a pattern example of a cooling operation in which a heat storage component is included in a heat source.

FIG. 6 is a diagram for explaining a pattern example of a cooling operation in which a heat storage component is included in a heat source.

FIG. 7 is a diagram for explaining a pattern example of a cooling operation in which a heat source includes a heat storage component.

FIG. 8 is a diagram for explaining a pattern example of a cooling operation in which a heat storage component is included in a heat source.

FIG. 9 is a diagram for explaining a pattern example of a cooling operation in which a heat storage component is included in a heat source.

[Explanation of symbols]

1 ... Heat storage tank, 2 ... Main heat source device, 3 ... 1st auxiliary heat source device, 4
… Second auxiliary heat source machine 5, 6… Primary pump, 7… Secondary pump, 9… Fan coil unit T… Temperature detector, Q… Flowmeter

Claims (1)

[Claims] 1. A heat storage tank, a main heat source machine that cools water in the heat storage tank to produce ice, and a plurality of auxiliary heat source machines, and the predicted load calculation is corrected by measuring the secondary side flow rate. By performing the control of the number of the plurality of auxiliary heat source machine by performing,
By monitoring the operation state of the auxiliary heat source machine and correcting the operation control, it is determined whether ice is being output according to the load prediction, and when the power is at a peak, the output of ice in the morning is stopped,
An operation control method in an ice heat storage system, which is operated by a non-heat storage operation method using only the main heat source device and the auxiliary heat source device, and is controlled to output ice as much as possible during a peak time of electric power.