JP3217113B2 - Thermal storage operation method for thermal storage tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system in which heat source water in a heat storage tank is circulated to an air conditioner. It relates to a control method.

[0002]

2. Description of the Related Art In ordinary building air conditioning, air conditioning equipment that circulates heat source water in a heat storage tank to an air conditioner and circulates heat source water in a heat storage tank to heat source equipment is frequently used.
At night, the heat source equipment is operated by using inexpensive nighttime electric power the night before the day, and the necessary heat quantity is stored in the heat storage tank.

[0003] The heat storage operation at night is performed by operation of a refrigerator in a cooling season and operation of a heater or a boiler in a heating season. The quality of the operation management greatly affects the running cost.

Conventionally, the heat storage operation is often managed based on empirical determination of the air conditioning load and the operating state of the device.
In addition, although the measured value of the water temperature in the heat storage tank was used as a guideline for the start / stop control of the heat source equipment, there is no guideline for accurately storing the amount of heat stored on the day without any excess or shortage. As a result, the amount of stored heat is insufficient, and in some cases, the amount is excessive, resulting in waste of energy.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to establish a control method for accurately storing the amount of heat required on the day of using the heat storage in the heat storage operation on the previous night. .

[0006]

According to the present invention, a secondary circulation path for circulating heat source water in a heat storage tank to an air conditioner and a secondary circulation path for circulating heat source water in the heat storage tank to heat source equipment are provided. In an air-conditioning system with a path formed, during heat storage operation in which the heat source equipment is operated using nighttime electric power , a large number of partitions are provided in the tank from the heat source water inlet side to the outlet side of the heat storage tank with communication passages. of
It is divided into small water tanks and temperature sensors are placed in each small water tank.
Tagami, operation detecting value of the temperature sensor of each of heat accumulation
It is necessary to know in advance how it will change from the start, and to obtain the correlation between the magnitude of _the air-conditioning load and the detection value of each temperature sensor at the time of completion of the heat storage to cover this.
After predicting the air conditioning load of the day using the stored heat, the temperature at the time of completion of heat storage corresponding to the predicted air conditioning load
The detected value of the sensor (heat storage completion judgment sensor value) is
From the heat storage completion judgment sensor value reaches a predetermined temperature.
Predicts that heat storage corresponding to the predicted load has been completed
In addition , the present invention provides a heat storage operation method for an air-conditioning heat storage tank, in which the operation of the heat source device is stopped when the prediction is completed.

[0007]

FIG. 1 shows an example of an air conditioner for implementing the present invention. 1 indicates a heat storage tank, and 2 indicates an air conditioning load of an air conditioner or the like. The heat source water is supplied to the air conditioning load 2 from the heat storage tank 1 by the secondary side pump group 3 by the outward pipe 4, and returned to the heat storage tank 1 by the return pipe 5. This circulation path of the heat source water is called a secondary circulation path.

On the other hand, heat source water in the tank is supplied from a heat storage tank 1 to a heat source device (in the example, a refrigerator) 6 by a primary pump 7, and cold water (hot water in the case of a heating device) is stored in the heat storage tank 1. Is returned to. This circulation path of the heat source water is called a primary circulation path.

A description will be given below of an example of cold heat storage when the heat source device is a refrigerator. In the heat storage operation in which the refrigerator 6 is operated using nighttime electric power, cold water is introduced into the low temperature tank 8 of the heat storage tank 1, and the cold water flows through the inside of the tank toward the other high temperature tank 9 and freezes from the high temperature tank 9. Machine 6. in this case,
In a normal heat storage tank, a large number of partition walls are divided into small water tanks from the low-temperature tank 8 to the high-temperature tank 9, and an appropriate communication hole is provided in this partition wall, and a diversion weir structure is performed.

In carrying out the present invention, a number of temperature sensors are provided in a tank from a low-temperature tank 8 on the inlet side of the heat source water to a high-temperature tank 9 on the outlet side.
10 ₁ to 10 _n are arranged at predetermined intervals. Operation start of the refrigerator 6 and upon entering the night power hours (o'clock Normal 22) but grasped in advance whether the detection value of the temperature sensors 10 ₁ to 10 _n from the operation start how changes Keep it.

FIG. 2 shows an example of the measured values. The detected value of each of the temperature sensors 10 ₁ to 10 _n is represented by T ₁
And through T _n, which temperature on the vertical axis is plotted in the same coordinates the horizontal axis represents time, showing the behavior with each different aging. If this behavior is recorded for each of the initial values of T _{1 to} T _n when the heat storage operation is performed under the same flow rate using the same refrigerator, the initial values of T _{1 to} T _n can be determined. If this happens, its behavior can be predicted.

From this correlation, the heat storage amount from the start of the heat storage operation to a certain time can be obtained by calculation. That heat storage amount at a certain time, the water temperature T _n (e.g., 12 ° C.) of a thermostat _9, the water temperature T _i of the detected _values, the volume of each small aquarium (heat source water volume each measurement takes charge) and V , The amount of heat stored at that time = Σ (T _n −T _i ) × V _n .

As described above, the amount of heat stored after the start of heat storage is
It can be obtained by calculation from the pattern of Figure 2, on the contrary, when the amount of stored heat is given, be associated with a respective detection value and T ₁ through T _n of this value and each temperature sensor 10 ₁ to 10 _n Can be done.

FIG. 3 shows this correspondence. The vertical axis is the corresponding value T
Show ₁ through T _n, referred to as a heat storage completion determining sensor value.
Using the relationship in FIG. 3, the required amount of heat storage corresponds to the air conditioning load, so if the load on the day using that heat storage is determined, the heat storage completion determination sensor value is determined.

The load amount of the building on the day of the cooling operation can be predicted from the previous day's load amount, weather information, the anniversary load information of the previous year, disturbance information, and the like, before the start of the heat storage operation or before the middle of the time period. It has already been put to practical use. Therefore, the heat storage completion determination sensor value is obtained from the predicted load amount using the relationship shown in FIG.

[0016] For example, the heat storage completion judgment sensor values from the predicted load from the relationship of FIG. 3 is assumed to be T _6, the reference temperature, for example, 5 ° C. + alpha of the heat storage completion judgment sensor value T ₆ a predetermined temperature (cryostat 8 ... Α is a safe value), it can be predicted that heat storage corresponding to the predicted load has been completed.
The time at this time is indicated by a broken line in FIG. 2 and is 6:10 am. Therefore, if the operation of the refrigerator is stopped at this time,
The heat storage to cover the load of the day can be completed without excess or deficiency.

In this control, as shown in FIG. 1, a personal computer 12 for controlling a heat storage tank is arranged in parallel with a computer 11 for building management, and a start / stop control of a refrigerator is performed by a command from a remote station 13.

In the above-described embodiment, an example is described in which a refrigerator is used as a heat source device. However, the same can be applied to the case of heat storage when a hot water production device is used as a heat source device.

[0019]

As described above, according to the present invention,
In air-conditioning equipment, where the operation of heat source equipment accounts for the majority of running costs, heat storage can be achieved with the minimum required operation in the heat storage operation the previous night, and excessive heat storage is prevented, contributing significantly to energy and cost savings. Since heat storage can also be prevented, it can also contribute to peak cutting when power consumption during the day reaches a peak.

[Brief description of the drawings]

FIG. 1 is an equipment arrangement system diagram showing an air conditioner for implementing the present invention.

FIG. 2 is a diagram showing changes over time after the start of heat storage of detected temperatures of a large number of temperature sensors arranged in a heat storage tank.

FIG. 3 is a diagram illustrating a relationship between an air conditioning load amount and a heat storage completion determination sensor value.

[Explanation of symbols]

 Reference Signs List 1 heat storage tank 2 air-conditioning load 3 secondary pump 6 heat source equipment (refrigerator) 7 primary pump 8 heat source water inlet tank from heat source equipment (low temperature tank) 9 heat source water outlet tank to heat source equipment (high temperature tank) 10 Temperature sensor arranged in thermal storage tank 13 Remote station

Claims (2)

(57) [Claims] 1. An air conditioner having a secondary circulation path for circulating heat source water in a heat storage tank to an air conditioner and a secondary circulation path for circulating heat source water in a heat storage tank to a heat source device. During thermal storage operation, in which the equipment is operated using nighttime power, a communication path is provided inside the thermal storage tank from the heat source water inlet side to the outlet side.
It is divided into many small water tanks by cutting walls and
Temperature sensors are arranged, and how the detected values of these temperature sensors change from the start of the heat storage operation is known in advance. On the other hand _, the magnitude of _the air-conditioning load and the heat storage at the time of completion of the heat storage correlation obtained in advance between the detection value of the temperature sensors, after having predicted the air conditioning load of the day utilizing thermal storage thermal, heat storage corresponding to the predicted air conditioning load
Detection value of the temperature sensor at the time of completion (heat storage completion judgment sensor
Value) from the above correlation, and this heat storage completion judgment sensor value
When the temperature reaches the specified temperature, heat storage corresponding to the predicted load
A heat storage operation method for an air-conditioning heat storage tank, wherein the heat storage device is predicted to be completed, and the operation of the heat source device is stopped when the prediction is completed. 2. The heat storage operation method according to claim 1, wherein the heat source device is a refrigerator.