JPH01210832A - Method and device for estimating profile of heat medium temperature distribution - Google Patents

Abstract

PURPOSE:To understand an exact heat reserved state of a heat storage tank even if the number of heat medium temperature detectors by estimating the past heating medium temperature of one time point of a spot of this side by one against the flow direction of the heat medium, to be the present heat medium temperature of the present spot. CONSTITUTION:By primary and secondary chilled water flow meters 6, 7, a primary chilled water flow rate and a load flow rate are measured, and from its difference, an in-tank flow rate is calculated. Subsequently, a cumulative value of the in-tank flow rate is calculated, and a time point of an absolute value of this cumulative value goes to capacity per one tank is monitored. Next, whether the cumulative value at this time point is positive or negative is discriminated. When said value is positive, the primary chilled water flow rate is more than the load flow rate, therefore, as for the temperature of a water flow of each virtual water tank of the present time point, a temperature of a water tank of this side by one is regarded as its temperature. When said value is negative, the foregoing is reversed. However, in case of water tanks #1...50 in which a low temperature side terminal tank heat medium temperature detector 8, a high temperature side terminal tank heat medium temperature detector 9 and an intermediate heat medium temperature detector 10 are installed, a temperature which is measured at the present time point is set as a water flow temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and an apparatus for estimating the temperature distribution profile of a heat medium in a heat storage tank.

[Prior Art] As shown in FIG. 3, a conventional heat storage tank first pumps cold water from the high-temperature side end (right side in the drawing) of a cold water tank 1, which is a heat storage tank, by a primary cold water pump 4. Measure the primary cold water flow J (WR) at 6, and then
On the other hand, the cold water pumped up from the low temperature side end WI of the cold water tank 1 by the secondary cold water pump 5 is cooled by the secondary cold water flow meter 7. The load flow rate WL is measured, and the load device 3 absorbs heat and returns it to the high temperature side terminal tank 6. In other words, the primary cold water flow rate WR is determined by the operating status of the refrigerator 2, and the load flow rate WL is determined by the operating status of the load device 3 and its load amount. Therefore, the difference between the two results in the in-tank flow rate WT of the cold water tank 1. Moreover, the cold water tank 1 generally includes a plurality of partition walls (not shown) that communicate with each other.
The temperature of the cold water fluctuates discontinuously because it is composed of multiple groups of water tanks separated by .

Therefore, when measuring the temperature of the cooling water in the cold water tank 1,
Simply measuring the cold water temperature at one location in the cold water tank 1 does not accurately determine the temperature of the heat medium, so a plurality of heat medium temperature detectors are required.

[Problems to be Solved by the Invention] However, in order to accurately measure the temperature of the heat medium stored in a heat storage tank, it is preferable to measure the temperature of the heat medium across all tanks. The reality is that this is difficult to realize due to space constraints and costs. On the other hand, if the number of heat medium temperature detectors is reduced, it is impossible to accurately grasp the heat medium temperature, which is a trade-off problem. be.

Moreover, in recent years, heat source devices and their load devices are often operated at different times. For example, a refrigerator that produces a heat medium such as cold water is operated late at night, and the energy is stored in a heat storage tank. There is an attempt to make effective use of low-interest late-night electricity by absorbing heat during daytime operation of air conditioners and using it as a heat source. Therefore, in order to optimally control the operation of the heat source device during heat storage operation, heat dissipation operation, and simultaneous heat storage and heat dissipation operation, the profile of the temperature distribution of the heat medium stored in the heat storage tank must be determined in advance.
There is a strong demand for accurate understanding.

Therefore, the technical problem of the present invention is to overcome the above-mentioned drawbacks, to accurately grasp the profile of the heat medium without showing discontinuous distribution in the heat storage tank, and to install fewer heat medium temperature detectors than in the past. An object of the present invention is to provide a method for estimating the temperature of a heat storage tank and an estimating device thereof, which significantly reduces the temperature.

[Means for Solving the Problems 1] According to the present invention, in a method for estimating a profile of a heat medium temperature distribution that estimates a temperature profile of a heat medium flowing in a heat storage tank from a first position to a second position, The current temperature of the heat medium located closer to the second position among the heat media that Assuming, the current temperature of the heating medium located closer to the second position among the heating mediums adjacent to each other is,
When the actual measurement value of the heating medium temperature is given, a method for estimating the profile of the heating medium temperature distribution is obtained, which is characterized in that the actual measurement value is used as the current temperature.

Furthermore, according to the present invention, a heat storage tank for storing a heat medium, and first and second terminal tank heat medium temperature detection for actually measuring the temperature of the heat medium located at the first and second positions of the heat storage tank, respectively. The vessel and
one or more intermediate heat medium temperature detectors that actually measure the temperature of the heat medium located between the first and second positions; a load section that flows into the side, a heat source section that cools or heats the heat medium located on the second position side and flows it into the first position side, and a heat source flow rate that measures the flow rate of the heat source poured from the heat source section. a measuring section, a load flow rate measuring section that measures the load flow rate poured from the load section, and the heat 'J! A flow rate difference calculation unit that calculates the flow rate difference per unit time between the X flow rate and the load flow rate, a cumulative flow difference calculation unit that calculates the cumulative flow difference by accumulating the flow difference, and a the first and second in the heat storage tank based on the cumulative flow rate difference.
a flow direction determination unit that determines the flow direction of the heat medium between the positions, and when the flow direction is from the first position side to the second position side, a flow direction determining unit that determines the flow direction of the heat medium between the positions, and when the flow direction is from the first position side to the second position side, The current temperature of the heating medium located closer to the second position is estimated to be the past temperature of the heating medium located closer to the first position among the mutually adjacent heating media, and the flow direction is When the direction is from the second position side to the first position side, the current temperature of the heat medium located closer to the first position among the mutually adjacent heat mediums is determined as the temperature of the heat medium located closer to the first position. a heating medium temperature estimating unit that estimates the past temperature of a heating medium located closer to the second position among the media; and a heating medium temperature estimating unit that estimates the past temperature of the heating medium located closer to the second position, and It is characterized by having an estimated temperature changing unit that changes the current temperature at each point actually measured by the first and second heat medium temperature detectors and the intermediate heat medium temperature detector to each current actual measurement value. A profile estimating device for heat medium temperature distribution is obtained.

[Function] The present invention focuses on the fact that the temperature of the heat medium at each point fluctuates in the direction of flow of the heat medium itself. In other words, the current temperature of the heat medium at the current point is estimated from the temperature of the heat medium at a previous point in the past in the flow direction of the heat medium, and the actual measured values of the heat medium temperature at several locations are ,
By sequentially repeating the current temperature at that point, the temperature at the minimum actual measurement point can be used to correct the estimated temperature at other points one after another, without having to actually measure the temperature of the heat medium at all points one by one. Become.

Thereby, it is possible to perform an estimation suitable for the temperature distribution of the heat medium that shows a discontinuous profile within the heat storage tank.

[Example] Next, an example of the present invention will be described with reference to the drawings.

The present embodiment will be described with reference to the conventional cold water tank 1 shown in FIG.

First, as shown in FIG. 2, the cold water tank 1 includes a plurality of partition walls 11, 11. It is composed of a plurality of aquarium groups partitioned by ..., and the capacity of each aquarium group is not the same.Therefore, the cold water tank 1 consisting of these plurality of aquarium groups is regarded as one large container, and it is divided into several aquariums. Regardless of the water tank group, the capacity per II divided into 50 equal parts is WO, and the numbers #1 to #50 are numbered 1 from the low temperature end tank (left side of the drawing) to the high temperature end tank (right side of the drawing).・Fifty virtual water tanks were set 6, and the low temperature side end peripheral heat medium temperature detector 8 and the high temperature side end peripheral heat medium temperature sensor 9 were set as the low temperature side end tank #1 and the high temperature side end tank #1. 50, and furthermore, depending on the scale of the cold water tank 1, from several types to 10
A plurality of intermediate heat medium temperature detectors 10 were installed in the tank.

Next, referring also to the flowchart in Fig. 1, the cold water tank 1
The procedure for estimating the heat medium temperature will be explained below.

First, the primary and secondary cold water flowmeters 6 and 7 measure the primary cold water meteor WR and the load flow rate WL (Sl), and calculate the in-tank flow rate WT from the difference therebetween (S2).

Next, calculate the cumulative value WS of the flow rate WT in the tank (S3),
This series! The absolute value of a(B w s is the capacity per tank WO
The point in time is monitored (S4). Then, it is determined whether the cumulative value WS at this point is positive or negative (S5).

If it is positive (WS > O), the primary cold water flow rate WR is greater than the load flow rate WL, so the water flow in the tank flows from the low temperature side to the high temperature side, so the water flow in each virtual tank at the moment The temperature (Tk, O) of the previous aquarium, that is, the temperature of the aquarium before the temporary period with one less number # (Tk-1, -1
) is regarded as the relevant temperature (S6). Conversely, if it is negative (WS<O), the load flow rate WL is higher than the primary chilled water flow rate W.
Since the number is higher than R, the water flow in the tank flows from the high temperature side to the low temperature side, and the water flow in each virtual tank at the present time is determined by the water flow temperature (Tk + 1.1) of the tank before the temporary period with one number # higher than the water flow in the tank. temperature (Tk, O'l) (S7).However, a low temperature side end peripheral heat medium temperature detector 8, a high temperature side end peripheral heat medium temperature detector 9, and an intermediate heat medium temperature detector 10 are installed. In water tank #1...50, the water flow temperature (TI, O),... (T2O
, O) (S8).

Although 50 virtual water tanks were set in this embodiment, it is clear that increasing or decreasing the number of virtual water tanks in accordance with the requirements for temperature distribution profile accuracy is within the spirit of the present invention.

[Effects of the Invention] As described above, according to the present invention, even if the number of heat medium temperature detectors that detect the heat medium temperature in the heat storage tank is further reduced, an accurate heat storage state of the H heat tank can be maintained. This allows us to reduce the construction costs for installing heat medium temperature detectors, improve the flexibility of instrumentation work, and actively utilize the effective functions of heat storage tanks. .

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing a control procedure according to an embodiment of the present invention, FIG. 2 is a conceptual diagram of a virtual water tank according to the embodiment of FIG. 1, and FIG. 3 is a block diagram showing the state of circulation of cold water in the cold water tank. It is a diagram. 1... Cold water tank, 2... Freezer, 3... Load device,
4...Primary cold water pump, 5...Secondary cold water pump, 6
...Primary chilled water flow meter, 7...Secondary chilled water flow meter, 8.
...Low temperature side terminal tank thermal body temperature detector, 9...High temperature side end peripheral heat medium temperature detector, 10...Intermediate heat medium temperature detector, 11...Partition wall. Figure 1 L-1f number Figure 2 #l 1!2 Ko3 HI5 116
#7 Ko47 $48 1149 $
508: Low temperature example terminal tank temperature detector 9: High temperature side terminal tank temperature detector lO: Intermediate tank temperature detector Fig. 3

Claims (1)

[Claims] 1. In a heat medium temperature distribution profile estimation method for estimating a temperature profile of a heat medium flowing in a heat storage tank from a first position to a second position, among mutually adjacent heat mediums, The current temperature of the heat medium located closer to the second position is considered to be the past temperature of the heat medium located closer to the first position among the mutually adjacent heat media, and When the current temperature of a heating medium located closer to the second position among the heating mediums is given as an actual measurement value of the heating medium temperature, the actual measurement value is taken as the current temperature. A method for estimating the profile of heat medium temperature distribution. 2. A heat storage tank that stores a heat medium; first and second terminal tank heat medium temperature detectors that respectively measure the temperature of the heat medium located at the first and second positions of the heat storage tank; and one or more intermediate heat medium temperature detectors that actually measure the temperature of the heat medium located between the second positions, and applying a load to the heat medium located on the first position side to move the heat medium to the second position side. a load section into which the heat medium is poured, a heat source section which cools or heats the heat medium located on the second position side and flows it into the first position side, and a heat source flow rate measurement section which measures the flow rate of the heat source poured from the heat source section. a load flow rate measurement unit that measures the load flow rate poured from the load unit; a flow rate difference calculation unit that calculates the flow rate difference per unit time between the heat source flow rate and the load flow rate; a cumulative flow rate difference calculation unit that calculates a cumulative flow rate difference; and a flow rate of the heat medium between the first and second positions in the heat storage tank based on the cumulative flow rate difference when the cumulative flow rate difference exceeds a predetermined capacity. a flow direction determination unit that determines a direction; and when the flow direction is from the first position side to the second position side, a flow direction determination unit that is located closer to the second position side among mutually adjacent heat mediums; The current temperature of the heating medium is estimated to be the past temperature of the heating medium located closer to the first position among the adjacent heating mediums, and the flow direction is from the second position to the second position. 1, the current temperature of the heating medium located closer to the first position among the adjacent heating mediums,
A heating medium temperature estimation unit that estimates the past temperature of the heating medium located closer to the second position among the mutually adjacent heating mediums, and a current temperature of the heating medium estimated by the heating medium temperature estimation unit. an estimated temperature changing unit that changes the current temperature at each point actually measured by the first and second heat medium temperature detectors and the intermediate heat medium temperature detector to each actual measured value at the current time; A profile estimating device for heat medium temperature distribution, characterized in that it has: