JPH0466854A - Measuring method of ice content in ice-containing fluid supply system and apparatus used therefor - Google Patents

Abstract

PURPOSE:To enable accurate measurement of an ice content rate without causing any hindrance to supply of ice, by a method wherein the whole quantity of ice is melted by heating a sample fluid and the temperatures of the sample fluid before and after the heating, the entire quantity of applied heat and the quantity of the sample fluid are determined and subjected to an arithmetic processing. CONSTITUTION:As a heater 3 is turned ON by closing a switch 4, a counter 8 is started and also the temperatures T1 and (t) of a sample fluid at that time measured by a thermometer 5 (provided on the entrance side of the heater 3) and a thermometer 6 (provided on the exit side of the heater 3) are inputted respectively. As the temperature (t) rises to a set temperature T2 thereafter, the heater 3 is turned OFF by opening the switch 4, so as to end heating. At the same time, the counter 8 is stopped and the time (h) from the start to the end of heating is read. Subsequently, the quantity F of the sample fluid is calculated by multiplying a flow rate per unit time through a sample extraction pipe 2 by the time (h) by a sample fluid quantity calculating means 14, while the whole quantity Q of applied heat is calculated 13 on the basis of the time (h) and the characteristic of the heater 3. Then, an ice content rate (x) is calculated 15 by computing an equation Q = (T2 - T1)F + 80Fx.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention supplies ice-containing fluid, such as water slurry in which water or brine is partially frozen, to cool buildings. The present invention relates to a method for measuring water content and an apparatus for use in ice-containing fluid supply systems such as freezing food products in storage warehouses.

<Prior art> When cooling or freezing is performed using an ice-containing fluid as described above, it is necessary to measure the ice content in the ice-containing fluid in order to supply an appropriate amount of ice or to know the amount of ice consumed. You need to know the rate.

Therefore, conventionally, the following method has been used to measure the ice content.

A. First conventional example We focused on the fact that light is refracted by ice, which causes changes in light transmittance depending on the ice content, and we installed a projector and a receiver in the middle of the pipe that supplies ice. The transmittance was measured based on the ratio of the amount of light received to the amount of light emitted.

B. Second Conventional Example A mesh body with meshes large enough to allow ice to pass through was installed in the middle of the pipe supplying ice, and the flow resistance due to ice being caught in the mesh was measured to determine the ice content. The ice content was measured using the fact that the higher the flow resistance, the greater the flow resistance.

<Problems to be Solved by the Invention> However, the first and second conventional examples described above each have the following drawbacks.

a. Disadvantages of the first conventional example: The size and shape of ice is not uniform, and even if the ice content is the same, the measured transmittance will vary depending on the angle of the surface of the ice that receives the projected light. There was a drawback that the ice content could not be measured accurately.

b. Disadvantages of the second conventional example Even if the ice is of the same size, the degree to which it gets caught in the net changes depending on the position where the ice passes, causing a difference in the measured flow resistance, making it difficult to accurately determine the ice content. There was a drawback that it could not be measured.

In addition, in the case of this second conventional example, for example, when ice sticks to each other and becomes a large lump, it gets caught in the mesh and does not pass through, resulting in a problem with the supply of ice. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable accurate measurement of ice content without interfering with the supply of ice.

<Means for Solving the Problems> In order to achieve the above object, the method for measuring water content in an ice-containing fluid supply system of the present invention extracts a part of the water-containing fluid as a test T4 fluid, and Measure the temperature of the sample fluid, heat the sample fluid to melt the entire amount of ice, measure the temperature of the sample fluid after heating, calculate the total heating heat required for heating, and calculate the total amount of heat required for heating.
[It is characterized by calculating the ice content based on the difference between the body temperature and the heating temperature after heating, the amount of sample fluid taken out, and the total heating heat amount.

In addition, in order to achieve the above-mentioned object, the water content measuring device in the ice-containing fluid supply system of the present invention includes a sample extraction tube for taking out a part of the ice-containing fluid as a sample fluid, and a sample extraction tube for taking out a part of the ice-containing fluid as a sample fluid. a heating means for heating the sample fluid; a temperature measuring means for measuring the temperature of the sample fluid;
Necessary heat amount calculation means for calculating the total heating heat amount of the heating means necessary to heat the sample fluid to a temperature that melts the entire amount of ice, and the temperature of the sample fluid before heating and after heating measured by the temperature measuring means. and an ice content calculation means for calculating the ice content based on the difference between the temperature of the sample fluid and the total heating heat amount calculated by the required heat amount calculation means.

<Function> According to the configuration of the water content measuring method in the ice-containing fluid supply nostem of the present invention, a part of the ice-containing fluid is taken out,
The total amount of ice in the ice-containing fluid is heated and melted, and the ice content is determined based on the total heating heat required for melting and the amount of sample fluid.

Further, according to the configuration of the water content measuring device in the ice-containing fluid supply system B of the present invention, by connecting the sample extraction tube to the supply pipe of the ice-containing fluid, the sample fluid is taken out and heated by the heating means. , the total amount of water in the extracted ice-containing fluid is heated and melted, and the ice content can be calculated based on the total heating heat required for melting and the amount of the sample fluid.

<Example> Next, an example of the present invention will be described in detail with reference to the drawings.

Figure 1 is a schematic configuration diagram showing a first embodiment of a water content measuring device used in the method for measuring water content in an ice-containing fluid supply system of the present invention. Ice supply piping 1 that supplies ice-containing fluid frozen by an ice maker
A sample extraction tube 2 for extracting a part of the ice-containing fluid as a sample fluid is connected to a midway point of the sample extraction tube 2, and a heater 3 as a heating means for heating the sample fluid flowing therethrough is provided in the sample extraction tube 2. .

The circuit of the heater 3 is provided with an electromagnetically operated switch 4 for heating and stopping the heating.

A first thermometer 5 is provided on the inlet side of the sample extraction tube 2 to the heater 3 as a temperature measuring means for measuring the temperature T1 of the sample fluid flowing therethrough before heating.
A second thermometer 6 is provided on the exit side of the chamber to measure the temperature t of the heated sample fluid flowing therethrough.

As shown in FIG. 2, a first thermometer 5, a second thermometer 6, a temperature setting device 7, and a counter 8 are connected to an arithmetic device 9, and a switch 4 is connected to the arithmetic device 9 to open and close the switch 4. A switch drive circuit 10 to be operated is connected thereto.

/ji calculation device 9 includes temperature difference calculation means 11 and comparison means 1.
2. Required heat amount calculation means 13, sample fluid amount calculation means 14, and ice content calculation means 15 are provided.

Temperature difference calculation means 1] inputs the temperature T1 of the sample fluid before heating measured by the first thermometer 5 and the set temperature T2 set by the temperature setting device 7, and calculates the temperature difference (T, - T
, ) is calculated.

The comparison means 12 is set by the temperature setting device 7, for example,
Input the set temperature T2 such as 13°C and the temperature t of the sample fluid after heating measured by the second thermometer 6, and determine that the temperature t of the sample fluid after heating has reached the set temperature T2. A comparison output is output to each of the counter 8 and the switch drive circuit 10, and the counter 8 stops counting, and the switch 4 is opened to stop energizing the heater 3.

The required heat amount calculation means 13 inputs the count value from the counter 8 and calculates the total heating heat itQ required to raise the temperature of the sample fluid to the set temperature T2 based on the energization time to the heater 3. It is supposed to be done.

The sample fluid amount calculating means 14 inputs the count value from the counter 8 and calculates the amount F of the sample fluid flowing from the start of heating to the end of heating by the heater 3 based on the energization time to the heater 3. It has become.

The ice content calculation means 15 calculates the temperature difference (Tz -71) calculated by the temperature difference calculation means 11 and the required heat amount calculation means 13.
The total heating heat amount Q calculated in and the sample fluid amount calculation means 14
The amount F of the sample fluid calculated in is input, and these values are substituted into the calculation formula % to calculate the ice content χ.

Next, the calculation operation by the calculation device 9 will be explained using the flowchart shown in FIG.

When the switch 4 is closed and the heater 3 is turned on (step S1), the counter 8 is started (step S2).
At the same time, the temperatures T+ and t of the sample fluid at that time measured by the first and second thermometers 5.6 are respectively input (step S3).

After that, the process moves to step S4, and it is determined whether the temperature t of the sample fluid 4 measured by the second thermometer 6 has risen to the set temperature T2. is opened to turn off the heater 3 and end the heating (Step S5), and at the same time, the counter 8 is stopped and the time from the start of heating to the end of heating is read (Step S6).

Next, the sample fluid amount calculation means 14 calculates the sample fluid amount by multiplying the /it amount per unit time flowing in the sample extraction tube 2 by the time (step S7), and also calculates the sample fluid amount by the heating time and the heater 3. The total heating heat amount Q is calculated based on the characteristics (step S8).

Then, the temperature difference (T2 - T,) between the set temperature T2 and the temperature T1 of the sample fluid before heating, the total heating heat amount Q, and the amount F of the sample fluid are substituted into the calculation formula % formula %. After calculating the rate X (step S9), the process returns to step Sl.

With the above configuration, the content rate of ice contained in the sample fluid taken out from the ice supply pipe 1 can be accurately measured.

Figure 4 is a schematic configuration diagram showing a second embodiment of the water content measuring device, in which an electromagnetically operated first on-off valve 6 and a pump are installed in the middle of the ice supply pipe 1. A sample extraction tube 18 is connected to the sample extraction tube 17, and a quantitative tank 19 is provided in communication with the sample extraction tube 18 to store a set amount of sample fluid. A heater 20 is provided.

A thermometer 21 and a stirrer 22 are provided in the quantitative tank 19 to measure the temperature t of the sample fluid stored therein, and an electromagnetically operated second on-off valve 2 is provided at the bottom of the quantitative tank 19.
A discharge pipe 24 having a pipe 3 interposed therebetween is connected in communication.

With the above configuration, the water content rate χ is measured by the following procedure.

(2) While the second on-off valve 23 is closed, the first on-off valve 16 is opened and the pump 17 is driven to supply a set amount F of sample fluid to the quantitative tank 19.

■ Close the first on-off valve 16 and stop the pump 17, store the temperature measured by the thermometer 21 as the temperature T1 of the test sample 4 fluid before heating, and then turn on the heater 20 and The stirring tool 22 is driven.

■The temperature measured by thermometer 21 is also the set temperature T2
At this stage, the heater 20 is turned off, the total heating heat amount Q is determined by the required heat amount calculation means based on the time from the start of heating to the time of heating stop, and the total heating heat amount Q and the temperature difference calculation means are calculated. The temperature difference (T2 - T1) between the determined set temperature T2 and the temperature T1 of the sample fluid before heating and the amount F of the sample fluid are substituted into the calculation formula % formula %, and the ice content rate is determined by the ice content calculation means. Calculate X.

(2) Thereafter, the second on-off valve 23 is opened and the sample fluid in the quantitative tank 19 is discharged through the discharge piping 24.

These operations are repeated at predetermined time intervals (time until the influence of heat from the heater 20 disappears).

The water content measuring method and measuring device according to the present invention can be used, for example, to control the amount of ice supplied or to measure water consumption in an ice-containing fluid supply system that supplies ice-containing fluid to cool a building or freeze a storage warehouse. Used for calculations, etc.

Examples of the above-mentioned freezingable heat source fluid include ethylene glycol, glycerin, propylene glycol,
Brine or water is used, which is an aqueous solution that has a special solution such as ethanol or calcium chloride as the solute and water as the solvent, and has a lower freezing point than water and a higher specific gravity than ice.
Sheer-like ice made by freezing water in brine, block-shaped ice made by freezing water, etc. are used as the ice-containing fluid.

<Effects of the Invention> According to the method for measuring water content in the ice-containing fluid supply system of the present invention, the water content is measured based on the heat of fusion of ice in the extracted ice-containing fluid. It is possible to accurately determine the ice content without being affected by the shape and size of the ice inside, or even the properties of the ice, such as ice-like water.

In addition, since a portion of the ice-containing fluid is taken out as a sample fluid and the ice content is measured, there is no problem with the supply of the ice-containing fluid, unlike when a conventional mesh is provided, and the ice-containing fluid is Ice content can be measured without good feeding.

Furthermore, according to the structure of the ice content measuring device in the ice-containing fluid supply nostem G of the present invention, the ice content can be measured simply by connecting the sample extraction tube to the water-containing fluid supply pipe. Ice content can be easily measured.

[Brief explanation of drawings]

The drawings show an embodiment of a method for measuring water content in an ice-containing fluid supply system and a device used therein according to the present invention, and FIG. 1 is a schematic diagram showing a first embodiment of the water content measuring device; 2 is a block diagram, the third part is a flowchart explaining the calculation operation of the calculation device, and FIG. 4 is a schematic configuration diagram showing a second embodiment of the water content measuring device. 2... Sample extraction tube 3... Heater 5 as heating means... First thermometer 6 constituting temperature measuring means...
Second thermometer 13 constituting temperature measuring means...Required heat amount calculating means 15...Ice content calculating means 18...Sample extraction tube 20...Heater as heating means

Claims (2)

[Claims] (1) Take out a part of the ice-containing fluid as a sample fluid, measure the temperature of the sample fluid, heat the sample fluid to melt the entire amount of ice, and measure the temperature of the sample fluid after heating. At the same time, determine the total amount of heating heat required for heating, and calculate the ice content based on the difference between the temperature of the sample fluid before heating and the heating temperature after heating, the amount of sample fluid taken out, and the total amount of heating heat. A method for measuring ice content in an ice-containing fluid supply system. (2) A sample extraction tube for taking out a part of the ice-containing fluid as a sample fluid, a heating means for heating the sample fluid taken out into the sample extraction tube, a temperature measuring means for measuring the temperature of the sample fluid, and a sample fluid. a necessary heat amount calculation means for calculating the total heating heat amount of the heating means necessary to heat the sample fluid to a temperature at which the entire amount of ice is melted; and a temperature of the sample fluid before heating and after heating measured by the temperature measuring means. Ice content in an ice-containing fluid supply system comprising ice content calculation means for calculating ice content based on the difference in temperature, the amount of sample fluid, and the total heating heat amount calculated by the required heat amount calculation means. rate measuring device.