JPH0391633A - Regenerative heat source device and its heat storage amount control method - Google Patents

Abstract

PURPOSE:To reduce the capacity of facility by a method wherein when a load of next day to be expected corresponds to a specified high load, a control means capable of storing heat and storing cold heat corresponding to a load through a thermal accumulating movement even in the case of a time range not performing an air conditioning or not performing a night discount time is provided. CONSTITUTION:A temperature within a thermal accumulation tank 3 is detected by a temperature sensor 7 upon completion of an operation of an air conditioner and this detected value is inputted to a program controller 8. The program controller 8 has already inputted an expected reference temperature at a specified high load day of next day. If the detected water temperature within the thermal accumulation tank is higher than the reference temperature, it is expected that the next day will become the specified high load day. A thermal accumulating operation in a night time discounting time band and a thermal accumulating operation at a time band not corresponding to the night discounting time band are carried out. If the temperature is lower than the reference temperature, it is judged that the next day is normally a load day, and then the thermal accumulation operation is carried out only in the night discounting time band. With such an operation, it is possible to accommodate for a high load with a low facility capacity.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for controlling the amount of heat stored in a regenerative heat source device, and in particular, by extending the heat storage time in response to a specific high-load day, the equipment capacity can be increased. The present invention relates to a method for controlling the amount of heat stored in a heat storage type heat source device suitable for reducing the amount of heat stored in the heat source device.

[Prior art] Conventional regenerative heat source devices are described in Proceedings of the Japan Society for Air Conditioning and Hygiene (10.2-10.4, 1986).Research on unit type ice regenerative air conditioning systems for small and medium-sized buildings. , and Electric Heat ('84. No. 16) special report "Practice of thermal storage heat pump system" night discount hours based on (2)
2:00 to 8:00) was controlled to perform heat storage operation.

Also, from the opposite point of view, even in a specific high-load mill,
The capacity of the heat source equipment was selected so that the load could be covered by storing heat only during the night discount period.

[Problems to be Solved by the Invention] Since the above-mentioned conventional technology limits heat storage operation to nighttime discount hours, it is difficult to reduce the equipment capacity (capacity of heat source equipment) more than the conventional technology. Ta.

In particular, when high-density heat storage is performed using the phase change of substances, such as ice storage type heat source equipment, the difference between condensation temperature and evaporation temperature increases during heat storage operation, resulting in a decrease in heat output compared to when air conditioning is operated. Therefore, there is a problem in that it is difficult to reduce the facility capacity by performing heat storage operation only during nighttime discount hours.

The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide a regenerative heat source device and a control method thereof that can cover a larger load with a smaller equipment capacity. It is something.

[Means for Solving the Problems] In order to achieve the above object, a thermal storage type heat source device according to the present invention includes: a heat source device; and a heat storage tank connected to the heat source device.

The next day's load is predicted in a regenerative heat source device that is equipped with a means to control these, performs high-density heat storage and cold storage through phase change using nighttime electricity, and uses the stored heat in response to the daytime load. When the predicted next day's load is a normal load, heat storage operation is performed only during the night discount period based on the heat storage adjustment contract, and the predicted next day's load is specified. On high-load days, in addition to the heat storage operation during the nighttime discount hours, heat storage operation is also performed during times that are neither air conditioning hours nor nighttime discount hours, so that heat storage and cold storage can be performed in accordance with the load. The means are provided.

Moreover, in order to achieve the said objective, the structure of the heat storage amount control method of the storage type heat source device based on this invention is a heat source device, and a heat storage tank connected to this heat source device.

In a heat storage amount control method of a regenerative heat source device, which performs high-density heat storage and cold storage by phase change using nighttime electricity, and uses the stored heat in response to daytime loads, If the predicted load for the next day is a normal load, the heat storage operation is performed only during the night discount period based on the heat storage adjustment contract. When the predicted load for the next day is a specific high load day, in addition to the heat storage operation during the nighttime discount period, heat storage operation is also performed during times that are neither air conditioning hours nor nighttime discount hours to cope with the load. It stores heat and cool and controls it to keep it running.

More specifically, in order to realize the above-mentioned control, the present invention predicts in advance a specific high-load day based on statistical weather data, and inputs this predicted day in advance. corresponding to that particular high load day,
In addition to the heat storage operation during the nighttime discount hours, the heat storage operation is also performed during times that are neither air conditioning hours nor nighttime hours.

Moreover, in order to realize the above-mentioned control, the present invention has the following features:
The temperature of the heat storage tank at the end of the air conditioning period is detected, and based on that temperature, the heat storage operation is performed only during the night discount period, or in addition to the night discount period, when it is neither the air conditioning period nor the night discount period. The system also determines whether to perform heat storage operation or not, and performs heat storage operation appropriate for the load before air conditioning starts the next day.

Furthermore, in order to realize the above-mentioned control, the present invention predicts the next day's load based on statistical weather data and the current weather conditions, and based on the prediction, controls the load only during night discount hours. Determine whether to perform heat storage operation, or perform heat storage operation during the nighttime discount period as well as during times that are neither air conditioning hours nor nighttime discount hours, and based on this determination,
The system is designed to perform heat storage operation commensurate with the load before air conditioning starts the next day.

[Operations] The heat storage type heat source device is characterized in that when the load is constant, the longer the heat storage time, the more the capacity of the heat source device can be reduced.

Therefore, if heat storage operation is performed not only during the nighttime discount hours as in the past, but also during times when neither the air conditioning nor the nighttime discount hours are available, the heat source equipment with a smaller capacity can be used. can cover the same load.

In addition, in normal building air conditioning, the load that requires 100% of the capacity of the regenerative heat source device is about 10 days a year, and most of the other days the load is about 70% of the capacity. . Therefore, by using heat storage operation only during night discount hours,
The capacity of the heat source equipment is determined so that it can cover approximately 70% of the load of the mill, and also cover 100% of the specified high load days by running heat storage operations during times when neither air conditioning nor nighttime discount hours are available. do. Then, as mentioned above, the next day's load is predicted by load prediction, etc., and based on this, it is determined whether or not to perform heat storage operation even during times other than air conditioning hours or night discount hours, and the next day's load is predicted. By performing appropriate heat storage according to the requirements, the capacity of the heat source equipment installed in the thermal storage type heat source device can be significantly reduced.

[Example] Hereinafter, each example of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a schematic configuration diagram of a water storage type heat source device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the flow of heat storage amount control during cooling by the device in FIG. 1, and FIG. is a diagram showing program controller input data during cooling, the fourth
This figure is a flowchart showing the flow of heat storage amount control during heating by the apparatus of FIG. 1, and FIG. 5 is a diagram showing input data of the program controller during heating.

In FIG. 1, l is a heat source device (for example, a refrigerator) 2,
In the brine/water heat exchanger, this brine/water heat exchanger 2
For example, during air conditioning operation, heat exchange is performed between the antifreeze cooled by the heat source device 1 and the cold water returned from the load (for example, an air conditioner).

3 is a heat storage tank that stores heat generated using nighttime electricity;
4 is an ice-making heat exchanger that makes ice using heat generated using nighttime electricity, 5 is a chilled water pipe that leads cold water from the load, and 6, indicated by a thick solid line, is a heat exchanger on the heat source equipment and the brine/water heat exchanger. 2
and a brine pipe connecting the ice making heat exchanger 4.

7 is a temperature detector that detects the temperature inside the heat storage tank 3 after the air conditioning is finished.

Further, 8 is a program controller such as a central processing unit (CPU), and this program controller 8 executes a heat storage operation corresponding to the next day's load based on the output of the temperature detector 7 under the industrial heat storage adjustment contract. 22:00 to 8:00), or
It is determined whether the heat storage operation is to be performed even during a time period that is neither an air conditioning time period nor a night discount time period, and the heat source device 1 is controlled based on this.

9 is a three-way valve, and 10 is a temperature controller. This temperature controller 10 detects the outlet temperature of the three-way valve 9, and if this detected value is below the set temperature, opens the three-way valve 9 in the direction of the solid arrow. If the temperature is higher than the set temperature, the opening is controlled to open in the direction of the dashed arrow, thereby dissipating the heat in the heat storage tank and controlling the temperature of the cold water.

Note that in a heating heat storage device using a heat pump, the heat source device l is a heat pump, but the system is the same as in the case of cooling.

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

The operation of the ice storage type heat source device includes a heat storage operation at night and a cooling operation during the day.

For heat storage operation at night, operate heat source equipment 1 (refrigeration machine),
The brine in the brine pipe 6 is cooled to 0° C. or lower, and the ice making heat exchanger 4 in the heat storage tank 3 changes the phase of water in the heat storage tank 3 into ice, thereby storing heat. In conventional ice heat storage type heat source devices, such heat storage operation is controlled by a timer or the like so that it is performed only during the nighttime discount period from 22:00 to 8:00.

Next, during the daytime cooling operation, the heat source equipment 1 (freezer) is operated to cool the brine to about 4°C to 6°C, and the brine is led to the brine/water heat exchanger through the brine piping 6. By exchanging heat with the cold water returned from the load, the temperature of the cold water returned from the load is lowered. If the cold water in the cold water pipe 5 coming out of 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 arrow and is sent to the load. If the temperature of the cold water exiting 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;
By melting the ice stored in the heat storage tank 3, the temperature at the outlet of the three-way valve 9 is controlled.

Next, the operating procedure of the temperature detector 7 and the program controller 8, which are the core of the present invention, will be explained with reference to FIG. 2 for cooling operation. The numbers in parentheses in the following text are the step numbers of the flowchart in FIG.

After the air conditioning operation ends (step 5-1), the temperature inside the heat storage tank 3 is detected by the temperature detector 7, and this detected value is input to the program controller 8 (step 5-2). A reference temperature is input that predicts that the next day will be a specific high-load day, and if the detected heat storage tank water temperature is equal to or higher than that reference temperature, the next day is predicted to be a specific high-load day, and the night discount time is set. A heat storage operation in a zone (step S-4-1) and a heat storage operation in a time period that is neither an air conditioning time period nor a nighttime discount time period (step 5-3) are performed.

Also, if the detected temperature is less than the reference temperature.

The next day, it is determined that the mill is under normal load, and the heat storage operation (step S-4-2) is performed only during the nighttime discount period.

In this case, after the end of the heat storage operation during the nighttime discount period, the temperature of the heat storage tank 3 is detected again (step 5-6), and a heat storage completion reference temperature is input in advance.

If the detected heat storage tank temperature exceeds the heat storage completion reference temperature, heat storage operation is performed even during times other than air conditioning hours or night discount hours until the heat storage tank temperature falls below the heat storage completion reference temperature (step S-5), it is possible to control the amount of heat storage suitable for the load (step 5-7).

In addition to the method of inputting a certain reference value into the program controller 8 and determining the extension of the heat storage time by comparing the magnitude with the detected value as in the above embodiment, as shown in FIG. Input the relationship between the temperature of the heat storage tank at the end of air conditioning and the operating time during a time period that is neither the air conditioning time nor the night discount time, and calculate the temperature detected by the temperature sensor 7 of the heat storage tank 3 at the end of air conditioning and the From the relationship with the curve shown in FIG. 3, it is possible to control the amount of heat storage more appropriately in accordance with the load by determining the operating time in a time period that is neither the air conditioning time period nor the nighttime discount time period.

Furthermore, as a method of controlling the amount of heat storage based on such predicted load, there is a method of inputting tomorrow's heat storage time into the program controller 8 based on the weather forecast, or a method of programming statistical weather data from the past several years. A method has also been considered in which the weather data is input into the controller 8, the next day's load is predicted from this weather data and the current weather data, and the heat storage operation time is determined based on this prediction.

According to this embodiment, only for high-load mills used for about 10 days a year,
Since heat storage operation can be carried out during times that are neither air-conditioning hours nor nighttime discount hours, conventional thermal storage heat source equipment can be used on specific high-load days by performing heat storage operation only during nighttime discount hours. The capacity of the installed heat source equipment can be reduced by approximately 20% compared to the previous model.

Furthermore, by inputting a curve as shown in FIG. 3 to the program controller 8, it is possible to control the amount of heat storage in accordance with the load, and highly efficient operation is possible without leaving any heat storage unused.

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

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

After the air conditioning operation ends (step S-11), the temperature inside the heat storage tank 3 is detected by the temperature detector 7, and this detected value is input to the program controller 8 (step S-12). As in the case of cooling operation, the standard temperature when the next day is predicted to be a specific high-load day is input in advance to the program controller 8, and if the detected temperature is below this standard temperature, , predicting that the next day will be a specific high-load day, and performing heat storage operation during the night discount period (step S-14-).
In addition to step 1), heat storage operation is also performed during times that are neither air conditioning hours nor nighttime discount hours (step S-13).

Further, if the detected temperature exceeds the reference temperature, it is determined that the next day is a normal load mill, and heat storage operation is performed only during the nighttime discount period (step S-14-2). In this case, similarly to the cooling operation, after the end of the heat storage operation during the nighttime discount period, the temperature of the heat storage tank 3 is detected again (step S-16). If the tank temperature has not reached the heat storage completion reference temperature, heat storage operation is performed even during neither the air conditioning time nor the night discount time until the temperature of the heat storage tank 3 falls to the completion reference temperature (step S-15). Accordingly, it is possible to control the amount of heat storage suitable for the load (step S-17).

In addition, as in the case of cooling operation, as shown in Figure 5, the relationship between the temperature of the heat storage tank at the end of air conditioning and the operating time during times that are neither air conditioning hours nor night discount hours can be input. The temperature detected in the heat storage tank 3 by the temperature detector 7 at the time of termination,
From the relationship with the curve shown in FIG. 5, it is possible to control the heat storage amount more appropriately in accordance with the load by determining the operating time in a time zone that is neither the air conditioning time zone nor the nighttime discount time zone.

In addition, the above-mentioned methods such as weather prediction are also possible in the same way as cooling operation.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a regenerative heat source device and a control method thereof that can cover a larger load with a smaller installed capacity.

[Brief explanation of drawings]

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 the flow of heat storage amount control during cooling by the device in FIG. 1, and FIG. 4 is a diagram showing the program controller input data during cooling, FIG. 4 is a flowchart showing the flow of heat storage amount control during heating by the device in FIG. 1, and FIG. 5 is a diagram showing the program controller input data during heating. FIG. 1... Heat source equipment, 2... Brine/water heat exchanger, 3
... Heat storage tank, 4... Ice making heat exchanger, 5... Chilled water piping, 6... Brine piping, 7... Temperature detector, 8.
...Program controller, 9...Three-way valve, 10.
··Temperature controller.

Claims (1)

[Claims] 1. A heat source device, a heat storage tank connected to the heat source device, and a means for controlling these, which performs high-density heat storage and cold storage by phase change using nighttime electricity. In a thermal storage heat source device that is used to handle daytime loads, there is a method for predicting the next day's load or a means for inputting advance prediction results, and when the predicted next day's load is a normal load, Heat storage operation is performed only during the night discount time period based on the adjustment contract, and when the predicted next day's load is a specific high load, in addition to the heat storage operation during the night discount time period, it is neither air conditioning time nor night discount time period. A heat storage type heat source device characterized by being provided with a control means capable of carrying out heat storage operation even at certain times of the day to perform heat storage and cold storage corresponding to the load. 2. Equipped with a heat source device, a heat storage tank connected to the heat source device, and a means for controlling these, it performs high-density heat storage and cold storage through phase change using nighttime electricity, and the heat storage corresponds to daytime loads. In the method for controlling the amount of heat stored in a thermal storage heat source device that is used for Heat storage operation is performed only during the night discount period based on the heat storage adjustment contract, and if the predicted next day's load is a specific high load, in addition to the heat storage operation during the night discount period, it is also operated during air conditioning hours and night discount hours. 1. A method for controlling the amount of heat stored in a heat storage type heat source device, characterized in that the heat storage operation is performed even during times when the heat storage device is not in use, and control is performed so that heat storage and cold storage can be performed in accordance with the load. 3. Based on statistical weather data, predict in advance the day that will be a specific high load day, enter this predicted day into the advance input means, and set the nighttime 3. The method for controlling the amount of heat stored in a regenerative heat source device according to claim 2, characterized in that in addition to the heat storage operation during the discount time period, the heat storage operation is also performed during a time period that is neither an air conditioning time period nor a night time period. 4. Detect the temperature of the heat storage tank at the end of the air-conditioning period, and based on that temperature, select heat storage operation only during the night discount period, or set the temperature during the night discount period as well as the time that is neither the air conditioning period nor the night discount period. The heat storage device of the regenerative heat source device according to claim 2, wherein the heat storage device determines whether or not to perform the heat storage operation also in the belt, and performs the heat storage operation in accordance with the load before the next day's air conditioning starts. Volume control method. 5. Predict the next day's load based on statistical weather data and current weather conditions, and based on that prediction, choose to use heat storage operation only during the night discount hours, or reduce the air conditioning time in addition to the night discount hours. The system determines whether or not to perform heat storage operation even during times other than the nighttime discount period or the nighttime discount period, and based on this determination, the system determines whether to perform heat storage operation commensurate with the load before starting air conditioning the next day. A method for controlling the amount of heat stored in a regenerative heat source device according to any one of claims 2 to 4.