JP3123651B2 - Heat storage type heat source device and heat storage amount control method thereof - Google Patents

Description

The present invention relates to a heat storage amount control method for a heat storage type heat source device,
In particular, the present invention relates to a heat storage amount control method for a heat storage type heat source device suitable for reducing the installed capacity by extending the heat storage time corresponding to a specific high load day.

[Conventional technology] Conventional regenerative heat source devices are described in the academic papers of the Society of Air Conditioning, Harmony and Sanitation Engineering ('86 .10.2 to 10.4), "Study on Unit Type Ice Thermal Storage Air Conditioning System for Small and Medium-Sized Buildings,"'84.
No.16) As described in the special report “The practice of regenerative heat pump systems”, even during a very small number of specified high-load days during the year, nightly discount periods based on industrial thermal storage adjustment contracts ( 22: 00-8: 00) Only the heat storage operation was controlled.

Also, from the opposite point of view, even on a specific high load day, the capacity of the heat source device is selected so that the load can be covered by the heat storage only during the night discount time.

[Problems to be Solved by the Invention] In the above-described conventional technology, the heat storage operation is limited to a night discount time zone, so it is difficult to reduce the facility capacity (capacity of heat source equipment) more than the conventional technology. Was.

In particular, when performing high-density heat storage using a phase change of a substance such as an ice storage heat source device, the difference between the condensing temperature and the evaporating temperature during the heat storage operation becomes large, and compared with the air conditioning operation.
Since the heat output is reduced, there is a problem that it is difficult to reduce the installed capacity in the heat storage operation only during the night discount hours.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and a heat storage type heat source device capable of providing a smaller load with a smaller facility capacity and performing heat storage and cold storage corresponding to the load. It is an object of the present invention to provide a control method therefor.

Means for Solving the Problems In order to achieve the above object, a configuration of a heat storage type heat source device according to the present invention includes a heat source device, a heat storage tank connected to the heat source device, and a control for controlling the heat source device. Means for performing heat storage and cold storage using nighttime electric power and using the heat storage and cold storage corresponding to daytime loads, wherein the heat source device is a heat storage point only in a night discount time zone. The control means predicts the load of the next day, and when the predicted load of the next day is a normal load, the control means predicts the load of the next day. Only the heat storage operation is performed, and when the predicted load of the next day is a specific high load, in addition to the heat storage operation in the night discount time zone, the heat storage operation is performed in the non-air conditioning time zone and the non-night discount time zone. Run and load The heat source device is controlled so as to perform corresponding heat storage and cold storage.

Further, in order to achieve the above object, a configuration of a heat storage amount control method of a heat storage type heat source device according to the present invention includes a heat source device, a heat storage tank connected to the heat source device, and control means for controlling the heat source device. In the method of controlling the amount of heat stored in a regenerative heat source device that performs heat storage and cold storage using nighttime electric power and uses the heat storage and cold storage corresponding to the daytime load, the heat storage point only during the night discount hours Using the heat source equipment having a heat storage capacity that cannot cover the load on the specific high load day, the control means predicts the load on the next day, and if the predicted load on the next day is a load for image transmission, the night discount is applied. The heat storage operation is performed only during the time period, and when the predicted load of the next day is a specific high load, in addition to the heat storage operation during the night discount time period, the air conditioner is in the non-air-conditioning time period and the non-night discount time period. Perform thermal storage operation during hours What, heat storage corresponding to the load, and controls the heat source apparatus to perform the cold storage.

More specifically, in the present invention, in order to realize the above-described control, the control means predicts the load of the next day based on statistical weather data.

Further, in the present invention, in order to realize the above control, the control means determines whether the load on the next day is a normal load or a specific load based on the heat storage tank temperature detected at the end of the air conditioning time. It is like that.

Further, in the present invention, in order to realize the above-mentioned control, the control means predicts a load of the next day based on statistical weather data and current weather data.

[Operation] When the load is constant, the heat storage type heat source device has a feature that the capacity of the heat source device can be reduced as the heat storage time is longer.

Therefore, the heat storage time is set not only in the night discount time zone as in the past, but also in the non-air conditioning time zone and the non-night discount time zone, that is, in the time zone that is neither the air conditioning time zone nor the night discount time zone. When the heat storage operation is performed, the same load as that of the related art can be covered by a heat source device having a smaller capacity than that of the related art.

Also, the load that requires 100% of the capacity that the regenerative heat source device can exhibit is about 10 days a year in ordinary building air conditioning, and the load on most other days is about 70% of the capacity. . Therefore, only 70 hours of thermal storage operation during the night discount hours
In addition, the capacity of the heat source device is determined so as to cover the specific high load day of 100% by performing the heat storage operation not only in the air-conditioning time zone but also in the time zone other than the night discount time zone. Then, as described above, the load prediction and the like are used to predict the load on the next day, thereby determining whether to perform the heat storage operation during the non-air-conditioning time period and the non-nightly discount time period. By performing appropriate heat storage according to the load on the next day, the capacity of the heat source equipment mounted on the heat storage type heat source device can be significantly reduced.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a schematic configuration diagram of an ice storage type heat source device according to an embodiment of the present invention, FIG. 2 is a flowchart showing a flow of heat storage amount control during cooling by the device of FIG. 1, and FIG. Is a diagram showing program controller input data at the time of cooling, FIG. 4 is a flowchart showing a flow of heat storage amount control at the time of heating by the apparatus of FIG. 1, and FIG. 5 is a diagram showing program controller input data at the time of heating. FIG.

In FIG. 1, 1 is a heat source device (for example, a refrigerator), 2
Is a brine / water heat exchanger. The brine / water heat exchanger 2 exchanges heat between the antifreeze cooled by the heat source device 1 and ice cooling returned from a load (for example, an air conditioner) during air conditioning operation. Is what you do. 3 is a heat storage tank for storing heat generated using nighttime electric power, 4 is an ice making heat exchanger for making ice using heat generated using nighttime electric power, 5 is a chilled water pipe for guiding chilled water from a load, Reference numeral 6 shown by a thick solid line denotes a brine pipe connecting the heat source device 1 to the brine / water heat exchanger 2 and the ice making heat exchanger 4.

Reference numeral 7 denotes a temperature detector for detecting the temperature in the heat storage tank 3 after the completion of the air conditioning.

Reference numeral 8 denotes a program controller such as a central processing unit (CPU). The program controller 8 executes a heat storage operation corresponding to a load on the next day based on the output of the temperature detector 7 and an industrial heat storage adjustment contract. Only at night discount hours (22: 00-8: 00) based on the "Non-air-conditioning time zone or non-night-time discount time zone", that is, "time zone that is neither air-conditioning time nor night discount time" Also, it is determined whether or not to perform the heat storage operation, and the heat source device 1 is controlled based on the determination.

Reference numeral 9 denotes a three-way valve and reference numeral 10 denotes a temperature controller. The temperature controller 10 detects the outlet temperature of the three-way valve 9, and opens the three-way valve 9 in the direction of the solid arrow if the detected value is equal to or lower than the set temperature. When the temperature is equal to or higher than the set temperature, the temperature of the cold water is controlled by releasing the heat in the heat storage tank by controlling to open in the direction of the dashed arrow.

In a heating heat storage device using a heat pump, the heat source device 1 is a heat pump, but the system is the same as that for cooling.

The general operation of such an ice storage type heat source device will be described.

The operation of the ice storage type heat source device includes a nighttime heat storage operation and a daytime cooling operation.

In the nighttime heat storage operation, the heat source equipment 1 (refrigerator) is operated to cool the brine in the brine pipe 6 to 0 ° C. or less, and the water in the heat storage tank 3 is cooled by the ice making heat exchanger 4 in the heat storage tank 3. Heat is stored by changing phase to ice. In the conventional ice heat storage type heat source device, such a heat storage operation is controlled by a timer or the like so as to be performed only in a night discount time period from 22:00 to 8:00.

Next, in the daytime cooling operation, the heat source equipment 1 (refrigerator) is operated to cool the brine to about 4 ° C. to 6 ° C. and guide the brine to the brine / water heat exchanger through the brine pipe 6.
The temperature of the cold water returned from the load is reduced by performing heat exchange with the cold water returned from the load. If the chilled water in the chilled water pipe 5 that has exited the brine / water heat exchanger 2 has dropped to a predetermined temperature (for example, about 7 ° C.), the three-way valve 9 opens in the direction of the solid line arrow and is sent to the load. When the temperature of the chilled water that has exited the brine / water heat exchanger 2 has not fallen to a predetermined temperature, the three-way valve 9 opens in the direction of the dashed arrow to release the ice stored in the heat storage tank 3. By doing
The temperature at the outlet of the three-way valve 9 is controlled.

Next, the operation procedure of the temperature detector 7 and the program controller 8, which are the core parts of the present invention, will be described for the cooling operation with reference to FIG. The numbers in parentheses in the following text are the step numbers in the flowchart of FIG.

After the air conditioning operation is completed (step S-1), the temperature in the heat storage tank 3 is detected by the temperature detector 7, and the detected value is input to the program controller 8 (step S-2). A reference temperature predicted to be a specific high load day the next day is input to the program controller 8 in advance, and if the detected heat storage tank water temperature is equal to or higher than the reference temperature, the next day:
It is predicted that the day will be a specific high load day, and the heat storage operation in the night discount time zone (step S-4-1) and the heat storage operation in the time period other than the air conditioning time zone and the night discount time zone (step S-3).
And do.

If the detected temperature is lower than the reference temperature, the next day is determined to be a normal load day, and the heat storage operation (step S-4-2) is performed only during the night discount time period. In this case, after the end of the heat storage operation in the night discount time period, the temperature of the heat storage tank 3 is detected again (step S-6), and the heat storage completion reference temperature is input in advance, and the detected temperature of the heat storage tank is determined by the heat storage tank temperature. If the temperature exceeds the completion reference temperature, the heat storage operation is performed in a time period that is neither the air conditioning time period nor the night discount time period until the heat storage tank temperature falls below the completion reference temperature (step S-5). Suitable and suitable heat storage control is possible (step S-7).

Also, as in the above embodiment, the program controller 8
In addition to the method of inputting a fixed reference value and comparing the detected value with the detected value to determine the extension of the heat storage time, as shown in FIG. However, the relationship with the operation time in a time zone other than the night discount time zone is input, and the air conditioning is determined based on the relationship between the temperature detected in the heat storage tank 3 by the temperature detector 7 at the end of air conditioning and the curve shown in FIG. By determining the operation time in a time zone that is neither a time zone nor a night discount time zone, it is possible to control the heat storage amount more suitably according to the load.

Further, as a control method of the heat storage amount based on such a predicted load, a method of inputting a heat storage time of tomorrow into the program controller 8 based on a weather forecast or the like, or
Statistical weather data for the past several years is input to the program controller 8, the next day or future load is predicted from the weather data and current weather data, and the heat storage operation time is determined based on the prediction. Methods are also being considered.

According to this embodiment, only on high-load days of about 10 days a year,
The heat storage operation can be performed during the hours other than the air-conditioning time period and the night discount time period, so the heat storage type heat source device that performs the heat storage operation only during the night discount time period and responds to specific high load days as before The capacity of installed heat source equipment is about
It can be reduced by about 20%.

Also, if a curve as shown in FIG. 3 is input to the program controller 8, heat storage amount control according to the load can be performed, and high-efficiency operation without remaining heat storage can be performed.

Although the above embodiment describes an example in the cooling operation, the present invention can also be applied to a heating and heat storage operation using a heat pump or the like.

The control operation in this case will be described with reference to FIG. The numbers in parentheses in the following text are the step numbers in the flowchart of FIG.

After the air conditioning operation is completed (step S-11), the temperature in the heat storage tank 3 is detected by the temperature detector 7, and the detected value is input to the program controller 8 (step S-12). As in the case of the cooling operation, the program controller 8 includes:
On the next day, a reference temperature in the case where it is predicted that a specific high load day is to be input is input. If the detected temperature is equal to or lower than this reference temperature, the next day is predicted to be a specific high load day, and nighttime By using the heat source equipment 1 having a heat storage capacity that cannot cover the load on the specific high load day in the heat storage operation only in the discount time zone, the heat storage operation in the night discount time zone (step S-14-).
In addition to 1), the heat storage operation is performed in a time zone other than the air conditioning time zone and the night discount time zone (step S-13).

If the detected temperature exceeds the reference temperature, the next day is determined to be a normal load day, and the heat storage operation is performed only during the nighttime discount period (step S-14-2). Also in this case, similarly to the cooling operation, the temperature of the heat storage tank 3 is detected again after the end of the heat storage operation in the night discount time zone (step S-16), and the heat storage completion reference temperature is input in advance and the temperature is detected. If the temperature of the heat storage tank has not reached the heat storage completion reference temperature, the heat storage operation is performed during a time that is neither the air conditioning time zone nor the night discount time zone until the temperature of the heat storage tank 3 falls to the completion reference temperature (step S-15). Thereby, suitable heat storage amount control suitable for the load can be performed (step S-17).

As in the case of the cooling operation, as shown in FIG. 5, the relationship between the temperature of the heat storage tank at the end of air conditioning and the operation time in a time period other than the air conditioning time period and the night discount time period is input. From the relationship between the temperature detected in the heat storage tank 3 by the temperature detector 7 at the end and the curve shown in FIG. 5, the operation time in a time zone that is neither the air conditioning time zone nor the night discount time zone is determined. Suitable heat storage amount control according to the load is possible.

In addition, each of the above-described methods such as weather forecasting is also possible as in the cooling operation.

[Effects of the Invention] As described above in detail, according to the present invention, a regenerative heat source device capable of covering a larger load with a smaller installed capacity and capable of performing heat storage and cold storage corresponding to the load, and the same. A control method can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an ice storage type heat source device according to one embodiment of the present invention, FIG. 2 is a flowchart showing a flow of heat storage amount control during cooling by the device of FIG. 1, and FIG. Is a diagram showing program controller input data at the time of cooling, FIG. 4 is a flowchart showing a flow of heat storage amount control at the time of heating by the apparatus of FIG. 1, and FIG. 5 is a program controller input data at the time of heating. FIG. 1 ... heat source equipment, 2 ... brine / water heat exchanger, 3 ...
Heat storage tank, 4 ... Ice making heat exchanger, 5 ... Cold water piping, 6 ...
Brine piping, 7 Temperature detector, 8 Program controller, 9 Three-way valve, 10 Temperature controller.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Risuke Onoda 603, Kandamachi, Tsuchiura-shi, Ibaraki Pref. Hitachi, Ltd. Tsuchiura Plant (56) References JP-A-60-44785 (JP, A) -97121 (JP, U) Japanese Utility Model 1-88328 (JP, U) JP-B-57-61985 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 B01J 19/00

Claims (5)

(57) [Claims] 1. A heat source device, a heat storage tank connected to the heat source device, and control means for controlling the heat source device, wherein heat storage and cold storage are performed using nighttime electric power, and the heat storage and cold storage are performed during daytime. In the heat storage type heat source device used corresponding to a load, the heat source device has a heat storage capacity that cannot cover a load on a specific high load day in a heat storage operation only during a night discount time zone. When the predicted load of the next day is a normal load, the heat storage operation is performed only during the night discount time zone, and when the predicted load of the next day is the specific high load, the heat storage operation of the night discount time zone is performed. In addition to the heat storage operation, the heat source device is controlled to perform the heat storage operation during the non-air-conditioning time zone and the non-night discount time zone to perform heat storage and cold storage corresponding to the load. Regenerative heat Apparatus. 2. A heat source device, a heat storage tank connected to the heat source device, and control means for controlling the heat source device, wherein heat storage and cold storage are performed using nighttime electric power, and the heat storage and cold storage are performed during daytime. In the heat storage amount control method of the heat storage type heat source device used corresponding to the load, the heat storage device having a heat storage capacity that cannot cover the load on a specific high load day in the heat storage operation only during the night discount time period, By means, the load of the next day is predicted, and when the predicted load of the next day is a normal load, the heat storage operation is performed only during the night discount time zone, and when the predicted load of the next day is a specific high load, In addition to the heat storage operation in the night discount time zone, the heat source device is configured to perform the heat storage operation in the non-air conditioning time zone and the non-night discount time zone to perform heat storage and cold storage corresponding to the load. To control Heat storage amount control method for regenerative type heat source apparatus according to symptoms. 3. The controller according to claim 2, wherein said control means predicts the load of the next day based on statistical weather data.
A heat storage amount control method for the heat storage type heat source device described in the above. 4. The thermal storage system according to claim 2, wherein said control means determines whether the load on the next day is a normal load or a specific load based on the temperature of the thermal storage tank detected at the end of the air conditioning time. Heat storage control method for heat source device. 5. A method according to claim 2, wherein said control means predicts the load of the next day based on statistical weather data and current weather data.