JPH0544967A - Ice making amount measuring device/and ice making amount measuring method/for ice heat accumulating device - Google Patents

Abstract

PURPOSE:To enable accurate measurement of an ice making amount of a cold accumulating material in which an iced substance is mixed. CONSTITUTION:In a circulation passage 6 on the downstream aide of an inced substance producing means 3, a pressure loss p1 of the flow of a cold accumulating material W before production of an iced substance is measured by a pressure loss measuring means A. Thereafter, a pressure loss p2 after production of an iced substance is measured. From p1 and p2 obtained through measurement, a pressure loss difference ( p2- p1) is determined. By a formula of an ice making factor - a differential pressure characteristic curve, an ice making amount responding to ( p2- p1), is calculated and an ice making amount of a cold accumulating material flowing through the circulation passage is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice-making amount measuring device and an ice-making amount measuring method for an ice heat storage device which circulates a cold storage material in an ice storage tank to produce a slurry iced product.

[0002]

2. Description of the Related Art In recent years, heat storage air-conditioning systems have been used for relatively large-scale air-conditioning systems in industrial plants and buildings. BACKGROUND ART A heat storage air conditioning system has a dynamic system in which ice is used to store cold heat and ice is generated without adhering it to the cooling surface.

In this dynamic type ice heat storage device, for example, a circulation path for circulating the cold storage material of the ice storage tank is provided between the heat exchanger for subcooling generation connected to the cooling device and the ice storage tank. In some cases, after cooling the regenerator material in the ice storage tank with a heat exchanger for generating subcooling, the supercooled state is eliminated to generate slurry-like ice.

When performing the ice making operation, it is necessary to detect the ice production rate, that is, the ice making amount, and perform the ice making control according to the ice making amount in order to secure the required ice making amount within a predetermined time. However, in the dynamic type ice heat storage device, since the cold storage material is a two-phase flow of water and ice, it is difficult to selectively quantify only ice, and it is difficult to measure the amount of ice making.

Here, the ice-making amount measuring device in the static type ice heat storage device is disclosed in, for example, "Heat Pump Cooling and Heating No. 24-Ice Heat Storage Special Feature-" (Power Conditioning Research Group, P9). However, at present, no practical device has been developed for measuring the amount of ice making in a dynamic type ice heat storage device, and there are only laboratory level devices. The outline of the ice-making amount measuring device for the two-phase flow of water-ice at the laboratory level is as follows. First, a sample of a slurry-like iced substance is taken out, and the sample is roughly drained. Next, the sample is placed in a centrifugal dehydrator installed in a thermostatic chamber adjusted to 0 ° C. to completely drain water. After that, the mass of the sample is measured, the volume fraction of ice is obtained based on this mass, and the volume fraction of the ice is multiplied by the flow rate of the two-phase flow and the density of ice, which have been measured in advance, to make the ice-making amount. Is to seek.

Further, as a practical ice-making amount measuring device, there is a device which measures the ice-making amount from the capacity of a heat exchanger for producing subcooling.

[0007]

However, in the above-mentioned ice making amount measuring device, since the sample is taken out every time, it is troublesome and inefficient, and continuous measurement cannot be carried out, so that it cannot be applied to the dynamic type ice heat storage device.

Further, in the ice making amount measuring device for measuring the ice making amount from the capacity of the heat exchanger for producing subcooling, there is a problem that the ice making amount obtained by the measurement has a large error.

The present invention has been made in view of the above problems, and an object thereof is to enable continuous and accurate measurement of the amount of ice making of a cold storage material in which a frozen product is mixed.

[0010]

In order to achieve the above object, the means taken by the present invention is such that the pressure loss of the flow of the regenerator material increases as the amount of ice generated in the regenerator material increases. Focusing attention, the amount of ice making is calculated from the pressure loss when no iced substance is generated and the pressure loss when the iced substance is generated.

Specifically, as shown in FIG. 1, the means taken by the invention according to claim 1 is an ice storage tank (2) for storing a cold storage material (W) which is frozen into a slurry. And a frozen product generating means (3) for cooling the cold storage material (W) to produce a slurry-like frozen product, and the cold storage between the frozen product producing device (3) and the ice storage tank (2) An ice heat storage device provided with a circulation path (6) for forcibly circulating the material (W) is assumed.

[0012] Specifically, a pressure loss measuring means (A) provided in the circulation path (6) on the downstream side of the above-mentioned frost production means (3) for measuring the pressure loss of the flow of the regenerator material (W). ) Is provided. Further, upon receiving the output signal of the pressure loss measuring means (A), the pressure loss Δ before the formation of the iced substance
An ice making amount calculating means (B) for calculating the ice making amount based on p1 and the pressure loss .DELTA.p2 after the formation of the frozen product is provided.

According to a second aspect of the present invention, there is provided a method for measuring an amount of ice made in an ice heat storage device, comprising:
The pressure loss measuring means (A) measures the pressure loss of the flow of the regenerator material (W) in the circulation path (6) on the downstream side of the glaze formation means (3). Then, the output signal of the pressure loss measuring means (A) is received by the ice making amount calculating means (B) to obtain the pressure loss Δp1 before the formation of the iced product and then the pressure loss Δp2 after the formation of the iced product. The ice making amount is calculated based on both pressure losses Δp1 and Δp2.

[0014]

With the above construction, according to the inventions of claims 1 and 2, the cold storage material (W) is circulated between the ice storage tank (2) and the frozen product producing means (3), and a circulation path is provided. In the middle of (6), a slurry-like iced substance is generated by the iced substance generating means (3).

Then, the pressure loss measuring means (A) measures the pressure loss of the flow of the regenerator material (W) in the circulation path (6) on the downstream side of the frozen substance generating means (3). After obtaining the pressure loss .DELTA.p1 before the formation of the chloride, the pressure loss .DELTA.p2 after the formation of the glides is obtained. After that, the ice making amount calculation means (B) calculates the ice making amount based on the pressure loss Δp1 before the iced substance formation and the pressure loss Δp2 after the iced substance formation obtained by the measurement, and the circulation path (6) is calculated. The amount of ice making of the flowing cold storage material (W) will be measured.

[0016]

As described above, according to the first and second aspects of the present invention, first, the pressure loss Δp1 before the formation of the glides is measured, and then the pressure loss Δp2 after the formation of the glides is constantly measured. Since the ice-making amount calculation means (D) obtains the ice-making amount from the pressure loss Δp1 before and after the formation of the ice-making substance, it is possible to continuously measure the ice-making amount of the regenerator material (W) in which the iced substance is mixed. it can.

Further, since the pressure loss changes more sensitively than the capacity of the heat exchanger with respect to the change of the amount of ice making, as compared with the case where the amount of ice making is measured from the capacity of the conventional heat exchanger for supercooling generation, The amount of ice making can be accurately measured.

[0018]

Embodiments of the present invention will be described with reference to the drawings.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the structure of a supercooling control type ice heat storage device of the dynamic type ice heat storage device. The supercooling control type ice heat storage device eliminates the supercooling state in the middle of the circulation path to generate slurry-like iced matter, and controls the supercooling elimination strength in the circulation path to mix the iced matter. The cold storage material is transported to the ice storage tank while maintaining its fluid state.

In the figure, an ice heat storage device (1) cools an ice storage tank (2) and a cold storage material (W) for storing the cold storage material (W) that has been iced in a slurry form and forms a slurry form. And (3) an iced substance generating means (3) for generating the iced substance.
The iced substance producing means (3) is provided with a heat exchanger (4) for producing supercooling and a supercooling eliminating section (5).

As a method of eliminating the supercooled state of the supercooling elimination section (5), a thermal shock is given by cooling with a heat exchanger or the like, a large flow velocity or turbulent flow is generated, and vibration or bubbles are generated. There are various types such as those that give a mechanical shock by being generated, and seed ice that flows in from a strainer (not shown) provided on the upstream side of the heat exchanger (4).

The ice storage tank (2) and the heat exchanger (4)
The subcooling elimination section (5) and the subcooling elimination section (5) are connected by a circulation path (6) so that the regenerator material (W) can circulate. That is, the circulation path (6) is moved from the bottom of the ice storage tank (2) to the heat exchanger (by the pump (7) provided between the ice storage tank (2) and the heat exchanger (4). The cold storage material (W) is supplied to 4), and the cold storage material (W) flowing out from the heat exchanger (4) is returned to the upper part of the ice storage tank (2) through the supercooling elimination section (5). Is becoming

Here, the heat exchanger (4) is cooled by a direct expansion type in which the cold storage material (W) is directly cooled by a refrigerant, or the cold storage material (W) is indirectly cooled by cooled brine. It may be an indirect inflation type.
Water or an aqueous solution is used as the cold storage material (W).

Next, as a feature of this embodiment, a branch passage (10) is provided in the circulation passage (6) downstream of the subcooling elimination portion (5) as shown in FIG. .. Fork road (1
0) is connected to the circulation path (6) on the downstream side of the supercooling elimination section (5) and the circulation path (6) on the downstream side of the end point 0).
It is connected to the. The branch path (10) is provided with a pressure loss measuring section (A). This pressure loss measuring means (A) has a pressure loss Δ during a predetermined distance of the branch path (10).
It is designed to measure p, and pressure loss of the flow of the regenerator material (W) in which iced matter is not generated before iced matter formation Δp
1 is measured, and the pressure loss Δp2 of the flow of the regenerator material (W) in which the frozen substance is mixed after the formation of the frozen substance is measured.

The pressure loss measuring means (A) has a branch path (1
0) It consists of two pressure ports (not shown) provided on the upstream and downstream sides.
A non-polar material, which makes it difficult for ice, which is a polar molecule, to adhere to the surface.
For example, it is coated with a fluorine resin.

Further, the detection signal of the pressure loss measuring means (A) is inputted to the ice making amount calculating means (B) in the microcomputer (15). This ice making amount calculating means (B) is used to measure the pressure loss Δp1
And the pressure loss Δp2 after the formation of iced matter, the ice making amount is calculated.

As the ice making amount calculating means (B), for example, the pressure loss Δpo of the regenerator material (W) at various ice making rates and the pressure loss Δp before the formation of iced substances are preliminarily obtained.
The difference (Δpo-Δp1) from 1 is calculated, and the ice-making rate-differential pressure characteristic curve formula is created by plotting the ice-making rate against this pressure loss difference (△ po- △ p1). For the difference (Δp2-Δp1) between the pressure loss Δp2 after generation and the pressure loss Δp1 before ice formation, the ice-making rate is calculated from the formula of the above ice-making rate-differential pressure characteristic curve.

Next, a method of measuring the ice making amount using the ice making amount measuring device will be described together with the measuring operation.

The regenerator material (W) is circulated between the ice storage tank (2) and the iced substance generating means (3), and the iced substance forming means (3) forms a slurry in the middle of the circulation path (6). Glitter is formed.

Then, in the circulation path (6) on the downstream side of the glaze formation means (3), the pressure loss measurement means (A) is
First, the pressure loss of the flow of the regenerator material (W) before the formation of iced substances △
After measuring p1, the pressure loss Δp2 after the formation of the iced product is measured. After that, the pressure loss difference (Δp2-Δp1) is obtained from the pressure loss Δp2 after the formation of the iced substance and the pressure loss Δp1 before the formation of the iced substance obtained by the measurement. Then, the amount of ice making corresponding to this differential pressure is calculated by the formula of the above ice making rate-differential pressure characteristic curve, and the amount of ice making of the cold storage material (W) flowing through the circulation path (6) is measured.

As described above, according to the present embodiment, after first measuring the pressure loss Δp1 before the formation of the glides, the pressure loss Δp2 after the formation of the glides is constantly measured, and the pressure loss before and after the formation of the glides is measured. Since the ice making amount calculating means (B) obtains the ice making amount from the pressure loss difference (Δp2−Δp1), it is possible to continuously measure the ice making amount of the cold storage material (W) in which the iced substances are mixed. it can.

Further, the pressure loss Δp with respect to the change in the amount of ice making
Since the temperature changes more sensitively than the capacity of the heat exchanger, the amount of ice making can be measured more accurately than when the amount of ice making is measured from the capacity of the conventional heat exchanger.

Further, in this embodiment, since the amount of ice making in the circulation path (6) on the downstream side of the supercooling elimination section (5) can be measured, the circulation path ( A means for measuring the amount of ice making can be provided for the supercooling control type which eliminates the supercooling state in the middle of 6).

Further, the characteristics of the ice making rate and the pressure loss are not created for the pressure loss after the formation of the iced product, and the difference between the pressure loss after the formation of the iced product and the pressure loss before the formation of the iced product (Δp2−Δp1) is By creating the formula of ice making rate-differential pressure characteristic curve,
It is possible to save the trouble of creating all the equations of the characteristic curves of the pressure loss after ice formation and the ice making rate which are different for each device.

Further, by providing the pressure loss measuring unit (A) in the branch passage (6), it is possible to prevent the circulation passage (6) itself from being blocked even if the pipe passage is frozen and blocked due to the pressure loss measurement. it can.

Further, as a modified example of the ice making amount calculating means (B), instead of calculating the ice making amount by the formula of the ice making rate-differential pressure characteristic curve, an arithmetic expression for making the ice making amount is prepared and the microcomputer is operated. The ice making amount may be calculated by storing it in the memory and inserting the actually measured Δp1 and Δp2 in the arithmetic expression of the memory. As an arithmetic expression, for example, when the regenerator material (W) is water, it means a hydraulic power gradient i (pressure loss per unit length represented by liquid column height. I = Δp / l,
l: distance between pressure ports), the amount of ice making can be calculated from the following three equations.

I = (Cφ + 1) iw φ: additional pressure loss coefficient iw: before ice formation at the same flow rate as hydraulic gradient i (C =
0) hydraulic gradient φ = 23Fr ^-0.82 -0.5 Fr = U ² / (| 1-s | gD) Fr: Froude number, U: Flow velocity s: Specific gravity of ice (ratio of density of ice to density of water ) G: acceleration of gravity, D: pipe diameter In the present embodiment, an example in which the present invention is applied to an ice heat storage device in which the subcooling elimination unit (5) is provided in the circulation path (6) has been described. The present invention is not only applied to the ice heat storage device according to the present invention, but can be applied to any ice heat storage device in which the cold storage material (W) mixed with the iced substance flows through the circulation path (6). ..

As a measure for preventing ice buildup on each pressure port, a heater is attached to each pressure port to detect a temperature change when ice adheres, and the heater is energized to heat the pressure port. May be.

The pressure loss measuring section (A) may be provided in the circulation path (6).

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an ice heat storage device.

[Explanation of symbols]

 2 Ice storage tank 3 Iced substance generating means 6 Circulating path 10 Branching path A Pressure loss measuring means B Ice making amount calculating means

Claims (2)

[Claims] 1. An ice storage tank (2) for storing a cold storage material (W) that is frozen into a slurry, and ice for cooling the cold storage material (W) to produce a slurry-like ice product. An ice heat storage device provided with an ice formation generating means (3) and a circulation path (6) for forcibly circulating the cold storage material (W) between the ice formation generating means (3) and the ice storage tank (2). A pressure loss measuring means (A) provided in a circulation path (6) on the downstream side of the above-mentioned glaze formation means (3) for measuring the pressure loss of the flow of the regenerator material (W), and the pressure loss measuring means. In response to the output signal of (A), the pressure loss Δp1 before the formation of the glides and the pressure loss ΔP after the formation of the glides
An ice making amount measuring device for an ice heat storage device, comprising: an ice making amount calculating means (B) for calculating an ice making amount based on p2. 2. An ice storage tank (2) for storing a cold storage material (W) to be slurried in a slurry form, and ice for cooling the cold storage material (W) to produce a slurried ice product. An ice heat storage device provided with an ice formation generating means (3) and a circulation path (6) for forcibly circulating the cold storage material (W) between the ice formation generating means (3) and the ice storage tank (2). In the pressure loss measuring means (A), the pressure loss measuring means (A) measures the pressure loss of the flow of the regenerator material (W) in the circulation path (6) on the downstream side of the glaze generating means (3). The ice-making amount calculation means (B) receives the output signal of (3) to obtain the pressure loss Δp1 before the formation of the frozen product, and then the pressure loss Δp2 after the formation of the frozen product, and the pressure losses Δp1 and Δp2 of both. A method for measuring the amount of ice making of an ice heat storage device, characterized in that the amount of ice making is calculated based on.