JP3477317B2 - Heat storage material filling ratio measuring device, heat storage material filling ratio control device, heat storage material filling ratio measuring method, and heat storage material filling ratio control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for measuring and controlling a heat storage material filling rate applied to a heat transport system such as district cooling and heating.

[0002]

2. Description of the Related Art In a heat transport system using dynamic ice heat storage or PCM (phase change material), sherbet-like ice or phase change material is used as a heat storage material. This heat storage material is carried in a state of being mixed with a fluid such as water for carrying, and the mixed fluid supplied to the load side of a building heating / cooling device, etc. is mixed as a mixing ratio due to transportation conditions. There is an optimum value, and knowing the mixing ratio is important for evaluating the heat storage state.

Mixing ratio of this heat storage material and fluid IPF (I
There is currently no IPF meter put to practical use for measuring the ce packing factor (ice filling rate), and only various methods have been proposed.

Among them, a relatively effective method is to utilize the Coriolis force generated when a fluid flows in a pipe. The principle of flow rate measurement by the Coriolis method will be described below.

That is, the Coriolis mass flow sensor obtains the flow rate by detecting the Coriolis force acting on the fluid flowing in the vibrating pipe, and many methods have been reported depending on the pipe shape, the detection method and the like. However, here, an example of adopting the U-tube system is shown in FIG.
The configuration is shown in.

In the figure, the measurement fluid is divided by the branch elbow 1 and flows evenly through the two U-shaped sensor tubes 3 and 3 provided in the stainless steel sensor housing 2.
The sensor tubes 3 and 3 vibrate at their natural frequencies by the electromagnetic oscillator 4, and when a fluid flows inside the sensor tubes 3, 3 due to the Coriolis force F generated in the fluid, the flow rate is zero as shown in FIG. In contrast, as shown in FIG. 7B, the torque T for bending the pipe acts to bend the sensor tubes 3 and 3 by the angle θ. The bending angle θ is detected by electromagnetic position detection sensors 5 and 5 arranged at the same positions of the sensor tubes 3 and 3.

Now, assuming that the spring constant of the sensor tubes 3 and 3 is K, the relationship between the deflection angle θ and the mass flow rate Q is expressed by the following equation, and the mass flow rate Q can be obtained by measuring the deflection angle θ. it can. That is, T = K · θ = F · S = 2ω · Q · L · S (1) (where ω is the vibration angular velocity, S is the width of the sensor tube 3, and L is the length of the sensor tube 3.)

[0008]

However, when considering the above-mentioned IPF meter utilizing the Coriolis force, the device becomes complicated in principle, and a large-capacity heat transfer system for local supply is used. In practice, it is very difficult to manufacture the device.

As another method for measuring the IPF,
In principle, the mixing ratio of the two components can be accurately defined by measuring the weight of the fluid.
Under the current circumstances, it is necessary to transfer the mixed fluid once to a weight scale outside the system of the transportation pipe, and there is a problem that the conveyance of the mixed fluid is temporarily interrupted.

The present invention has been made in view of the above circumstances, and an object thereof is to be applicable to a large-capacity heat transfer system for regional supply and to interrupt the transfer of a mixed fluid. , A heat storage material filling rate measuring device capable of measuring and controlling an accurate filling rate of a heat storage material while having a simple structure, a heat storage material filling rate control device, a heat storage material filling rate measuring method and a heat storage material filling rate control method To provide.

[0011]

The invention according to claim 1 is
A measurement pipe having flexible joints at both ends, which is arranged in an existing heat transport pipe system, and a heat storage material and a transport fluid which are provided in a lower portion to support the measurement pipe and flow in the measurement pipe. And a calculating means for calculating the filling rate of the heat storage material in the mixed fluid from the measured value obtained by the weight measuring means.

With such a configuration, it can be applied to a large capacity heat transfer system without interrupting the transfer of the mixed fluid, and the filling rate of the heat storage material can be accurately measured while having a simple structure. .

According to a second aspect of the present invention, there is provided a measuring pipe having flexible joints at both ends, which is arranged in an existing heat transport pipe system, and is installed at a lower portion of the measuring pipe to support the measuring pipe. Weight measuring means for measuring the weight of the mixed fluid of the heat storage material flowing in the pipe and the transporting fluid, and calculating means for calculating the heat storage material filling rate in the mixed fluid from the measurement value obtained by this weight measuring means, It is characterized by comprising a control means for controlling a flow rate of at least one of the heat storage material and the transporting fluid flowing through the existing heat transport piping system based on the heat storage material filling rate obtained by the calculation means.

With such a configuration, it can be applied to a large capacity heat transfer system without interrupting the transfer of the mixed fluid, and the accurate filling rate of the heat storage material can be measured with a simple structure, and the measurement can be performed. The value can be fed back to automatically adjust the heat storage material filling rate.

According to a third aspect of the present invention, a heat storage material having flexible joints at both ends is arranged in an existing heat transport pipe system, and the heat storage material that supports the measurement pipe and flows through the measurement pipe. A weight scale for measuring the weight of the mixed fluid of the carrier fluid and the transport fluid is installed in the lower portion of the measuring pipe, and the heat storage material filling rate in the mixed fluid is calculated from the measurement value obtained by the weight scale. .

By adopting such a method, it can be applied to a large capacity heat transfer system without interruption of the transfer of the mixed fluid, and the filling rate of the heat storage material can be accurately measured while having a simple structure. .

According to a fourth aspect of the present invention, a heat storage material having flexible joints at both ends is arranged in an existing heat transport pipe system, and the heat storage material that supports the measurement pipe and flows through the measurement pipe. A weighing scale for measuring the weight of the mixed fluid of the transport fluid and the transport fluid is installed at the bottom of the measuring pipe, and the heat storage material filling rate in the mixed fluid is calculated from the measurement value obtained by the weighing scale, and the calculated heat storage It is characterized in that the flow rate of at least one of the heat storage material and the transporting fluid flowing through the existing heat transport piping system is controlled based on the material filling rate.

By adopting such a method, it can be applied to a large capacity heat transfer system without interrupting the transfer of the mixed fluid, and an accurate filling rate of the heat storage material can be measured with a simple structure, and the measurement can be performed. The value can be fed back to automatically adjust the heat storage material filling rate.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An IPF meter according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an IPF meter 10 attached to an existing heat transport line. In the figure, reference numeral 11 denotes a pipe for IPF measurement, and the pipe 11 for IPF measurement is arranged in the system of the existing pipe 12 by using a pipe having the same diameter as the existing pipe 12.

In this case, both ends of the IPF measurement pipe 11 on the inlet side and the outlet side are connected to the existing pipe 12 via flexible joints 13, 13 having small rigidity in the vertical direction. Flexible joint 1
The ends in contact with 3, 13 are supported by fulcrums 14, 14.

The IPF measurement pipe 11 itself is stably supported by the first weight scale 15a and the second weight scale 15b arranged at both ends of the lower portion of the IPF measurement pipe 11, and their weights are respectively supported. To be measured.

The weight scales 15a and 15b sense only the weight in the vertical direction with respect to the IPF measuring pipe 11, and determine the frictional force of the mixed fluid 16 flowing in the IPF measuring pipe 11 and the horizontal force based on the momentum change. Is a structure that does not sense, and is composed of a strain gauge, a piezoelectric element, or the like.

Next, the system configuration of the automatic IPF adjusting apparatus using the IPF meter 10 will be described with reference to FIG. In the figure, 21 is an ice storage tank that stores ice as a heat storage material, and 22 is a water storage tank that stores water as a fluid to be mixed with the ice stored in the ice storage tank 21 and conveyed. The ice stored in the ice storage tank 21 passes through the ice amount control valve 23, and the water stored in the water storage tank 22 passes through the water amount control valve 2
4 is supplied to each of the pumps 25 via the pump 4, and after being mixed here, the discharge force of the pumps 25 flows through the existing pipe 12 including the IPF meter 10 and is applied to the load 26 such as a cooling / heating device of the building. .

However, I obtained by the above IPF meter 10
The PF measurement value 27 is sent to the controller 28. Controller 28
Then, the IPF of the mixed fluid 16 is calculated from the IPF measurement value 27, and an error value with respect to the preset IPF is calculated from the calculation result, and the ice amount control valve 23 and the water amount control valve 2 are calculated.
4 as feedback signals 29a and 29b, respectively, to control each inflow amount.

The operation of the above arrangement will be described below. First, the operating principle will be described with reference to FIG. Now, as shown in the figure, the volume V of the entire IPF meter 10, the volume V _ICE of ice in the IPF meter 10, the volume V _W of water in the IPF meter 10, the first weighing scale 15a and the second weighing scale. 1
Each measurement W _A of 5b, and the sum W _A + W _B of W _B, water specific gravity ^{_{γ W (= 1000kg / m 3}} ), ice density gamma _ICE (=
920 kg / m ³ ), the weight W _W when there is only water in the IPF meter 10, the weight W when water and ice are mixed in the IPF meter 10, and the weight W when there is only ice in the IPF meter 10
_{With ICE} , the IPF can be derived by the following equation. That is,

[0026]

[Equation 1] The relationship between the obtained IPF and (W / _WW ) is shown in FIG. Here, since W _W is a constant value, (W
/ _W W) becomes to be proportional only to the W.

Under the above principle, the IPF meter 10 is arranged in the heat transport line as shown in FIG.
The measured value 27 is sent to the controller 28, and the feedback signals 29a and 29b that produce the set IPF value are generated and fed back to the ice amount control valve 23 and the water amount control valve 24, thereby automatically adjusting the IPF. Adjustments can be made.

[0028] Figure 5 is intended to illustrate a series of processing procedures performed at fixed time intervals in the feedback loop to obtain a measure 27 is the value W / W _W from IPF meter 10 to its original (step S1 ).

Next, the controller 28 calculates the measured value IPF _M using the equations (3) and (4) (step S).
2). Then, the preset value IPF _S given in advance by the controller 28 is input (step S3), and the error ΔIPF between the measured value IPF _M and the set value IPF _S is calculated “IPF _M −I
PF _S ”(step S4).

The direction in which the feedback control should be performed is judged by judging whether the sign of the error ΔIPF obtained in this way is negative (step S5). For example, if the sign of the error ΔIPF is negative, the above feedback is performed. The signal 29a opens the ice amount control valve 23 by a certain amount to increase the ice supply amount in the mixed fluid 16 (step S6).

On the contrary, when the sign of the error ΔIPF is not negative, the feedback control signal 29a closes the ice amount control valve 23 by a certain amount to decrease the ice supply amount in the mixed fluid 16 (step S7).

In the processing shown in FIG. 5, only the ice amount control valve 23 is opened / closed based on the feedback signal 29a to increase / decrease the ice supply amount in the mixed fluid 16. However, the present invention is not limited to this. Water quantity control valve 2 based on feedback signal 29b instead of 29a
4 may be controlled to be opened / closed to increase / decrease the amount of water supply in the mixed fluid 16, and further, the feedback signal 29a, 29b may be used together to control the entire mixed fluid 16 flowing through the existing pipe 12 and the IPF measurement pipe 11. The IPF may be controlled without changing the flow rate.

Further, in the above-described embodiment, an example in which ice is used as the heat storage material and water is used as the fluid is shown. However, other materials such as a phase change material (PCM) may be used as the heat storage material. Absent. Besides, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

[0034]

As described above, according to the present invention, it can be applied to a large-capacity heat transfer system for local supply, etc., and can accurately transfer heat without interrupting the transfer of the mixed fluid. It is possible to provide a heat storage material filling rate measuring device, a heat storage material filling rate control device, a heat storage material filling rate measuring method, and a heat storage material filling rate control method capable of measuring and controlling the material filling rate.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an IPF meter according to an embodiment of the present invention.

FIG. 2 is a diagram showing a system configuration of an IPF automatic adjustment apparatus according to the embodiment.

FIG. 3 is a view for explaining the operation principle of the IPF meter according to the same embodiment.

FIG. 4 shows measured values and IPF of the IPF meter according to the same embodiment.
The figure which shows the relationship with a value.

FIG. 5 is a flowchart showing a processing procedure according to the embodiment.

FIG. 6 is a diagram showing a configuration of a Coriolis mass flow sensor.

FIG. 7 is a diagram illustrating the operating principle of a Coriolis mass flow sensor.

[Explanation of symbols]

1 ... Elbow for fluid branch 2 ... Sensor housing 3 ... Sensor tube (U-shaped tube) 4 ... Electromagnetic oscillator 5 ... Electromagnetic position detection sensor 10 ... IPF meter 11 ... IPF measurement piping 12 ... Existing piping 13 ... Flexible joint 14 ... fulcrum 15a ... first weighing scale 15b ... second weighing scale 16 ... Mixed fluid 21 ... Ice storage tank 22 ... Water storage tank 23 ... Ice quantity control valve 24 ... Water control valve 25 ... Pump 26 ... Load 27 ... IPF measurement value 28 ... Controller 29a, 29b ... Feedback signal

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Fujiwara 2-1-1 Shinhama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Inventor Shoji Watanabe 2-chome, Niihama, Arai-cho, Takasago-shi, Hyogo No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Laboratory (72) Inventor Hiroo Sone 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries Ltd. Takasago Laboratory (72) Inventor Yuichi Otani 2 Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture 1-1-1 Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Inventor Shuji Sumiya 2-11-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries Takasago Works (72) Inventor Naohiro Yamazaki Arai-cho, Takasago-shi, Hyogo Prefecture 2-8-19 Niihama Takahishi Engineering Co., Ltd. (72) Inventor Kazuaki Nagahama Hiroshima, Hiroshima 9-12 Yokomachi Shinmachi, Nishi-ku, Chugai Technos Co., Ltd. (56) Reference JP-A-6-265184 (JP, A) JP-A-59-57833 (JP, A) JP-A-7-190421 (JP, A) Jitsukaihei 1-110329 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24F 5/00 102

Claims (4)

(57) [Claims] 1. A measuring pipe having flexible joints at both ends, which is arranged in an existing heat transport piping system, and a heat storage material which is provided at a lower portion to support the measuring pipe and flows through the measuring pipe. A weight measuring means for measuring the weight of the mixed fluid of the carrier fluid and the transport fluid, and a calculating means for calculating the heat storage material filling rate in the mixed fluid from the measurement value obtained by the weight measuring means. Heat storage material filling rate measuring device. 2. A measuring pipe having flexible joints at both ends, which is arranged in an existing heat transport piping system, and a heat storage material which is installed at a lower portion to support the measuring pipe and flows through the measuring pipe. A weight measuring means for measuring the weight of the mixed fluid of the carrier fluid and the transport fluid, a calculating means for calculating the heat storage material filling rate in the mixed fluid from the measurement value obtained by the weight measuring means, and a heat storage obtained by the calculating means. A heat storage material filling rate control device comprising: a control means for controlling the flow rate of at least one of the heat storage material and the transport fluid flowing through the existing heat transport piping system based on the material filling rate. 3. An existing heat-transporting piping system is provided with a measuring pipe having flexible joints at both ends, and the measuring pipe is supported to support a heat storage material and a conveying fluid. A heat storage material filling rate measuring method, characterized in that a weight scale for measuring the weight of the mixed fluid is installed at a lower portion of the measuring pipe, and the heat storage material filling rate in the mixed fluid is calculated from the measurement value obtained by the weight scale. . 4. An existing heat-transporting piping system is provided with a measuring pipe having flexible joints at both ends, and the measuring pipe is supported to connect the heat storage material and the transporting fluid. A weighing scale for measuring the weight of the mixed fluid is installed at the lower part of the pipe for measurement, the heat storage material filling rate in the mixed fluid is calculated from the measurement value obtained by the above weighing scale, and based on the calculated heat storage material filling rate. A heat storage material filling rate control method, characterized in that the flow rate of at least one of the heat storage material and the transport fluid flowing through the existing heat transport piping system is controlled.