JPH02677Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an ice amount measuring device used in an ice freezing tank, so-called ice bank, etc., to measure the amount of ice that grows on the cooling pipe surface, in other words, the amount of cold heat stored in the ice bank tank. Regarding. From the point of view of energy saving during summer cooling, the ice bank method uses electric power at night to freeze liquid, usually water, and store it as latent heat, which is then used during the day and night. It is useful because it can achieve the following effects.

Conventionally, various developments have been made regarding the detection, measurement, and control of the thickness of ice that grows on the cooling pipe surface in such an ice bank system, but these have been developed based on the localized state of ice that has grown on the cooling pipe surface. In order to detect, measure, and control ice, a plurality of these sensors were installed at appropriate locations, and calculations, etc., of the total amount of ice were performed based on their values.

However, the thickness of the ice that grows on the surface of the freezing tube depends on the amount of refrigerant flowing in the cooling tube, the flow rate of the water to be cooled, the shape of the flow, and the secondary effects of the ice that occurs due to this. Unless the flow of the refrigerant in the cooling pipes and the flow of the cooled water are in equilibrium, due to abnormal growth of ice at unspecified locations due to repeated freezing and melting, local ice thickness may be affected. In detection, it is difficult to measure and control the detection of the total amount of cold storage heat.

The present invention was developed in view of these points, and includes a heat insulating protection plate that prevents the cooling pipes in the tank and the ice that grows on the surface of the cooling pipes from being integrated with the wall surface of the freezing tank, and The water supply and drainage pipes for the water to be cooled outside the tank are isolated and supported and fixed from the freezing tank having an overflow mechanism, and the weight of the freezing tank filled with the water to be cooled before and after freezing is detected by a weighing sensor at the bottom of the freezing tank. By weighing it, the amount of ice that grows on the surface of the freezing tube can be calculated and measured by a calculation device connected to the weighing sensor, or the economical operation of the freezing device can also be controlled by this. It is something.

To explain the present invention with reference to drawings, this figure is a schematic diagram showing the principle of the present invention, 1 is an ice freezing tank, a cooling pipe 2 is inserted into the tank in a separate and supported manner, and a cooling device (Fig. Cooling is performed by passing a refrigerant (omitted here) through the inside of the cooling pipe 2. 3 is water to be cooled, 4 is ice that has grown on the surface of the cooling pipe, and 5 is a heat insulating protection plate that prevents ice from growing on the wall of the freezing tank, so that weighing of the freezing tank can be carried out without any trouble. What makes it possible, 6
is a support rod for the heat insulation protection plate, which supports and fixes the protection plate 5. 7 is an overflow hole provided in the freezing tank as an overflow mechanism for water to be cooled;
Water to be cooled is allowed to flow into a drain pipe 8 isolated from this, and the surface of the water to be cooled is always kept constant. This may be configured to automatically control the amount of water drained and supplied by a liquid level control device such as a float, and requires a structure that maintains a constant water level. 10 is a weighing sensor, and a load cell-like sensor equipped with a strain gauge is most preferable because the amount of displacement during weight measurement is extremely small.
In a weighing device with a large amount of displacement, the portions immersed in the water to be cooled, such as the cooling pipe 2, the heat insulating protection plate 5, or the support rod 6, will change, resulting in a large measurement error.

12 is a weighing calculation device connected to the weighing sensor 10, and the weighing sensor 10 and the calculation device 1
2, the weight of the freezing tank 1 including the water to be cooled is weighed, and the amount of freezing is calculated from the difference in weight before and after freezing, and its latent heat amount is also calculated, and the amount of sensible heat, etc. of the water to be cooled in the freezing tank is also added. It is also possible to have the system do this and give instructions for the total amount of cold storage heat. Reference numeral 11 denotes a support beam, which supports and fixes the cooling pipes 2, drain pipes 8, water supply pipes 9, heat insulating protection plates 5, etc. other than the freezing tank 1 while isolating them from the freezing tank 1 as described above.

Next, the operation effect of the present invention will be explained. The cooling pipe 2 is cooled by the flow of refrigerant in the cooling pipe 2, and the water to be cooled 3 flowing in contact with the pipe surface is cooled and ice begins to form on the pipe surface, and freezing occurs as shown in the figure 4. . Depending on the cooling time and operating conditions, the growth of ice may reach the heat insulating protection plate 5, but this prevents the ice from growing to the wall of the freezing tank 1, and protects the ice tank 1, cooling pipes 2, and other parts. It is isolated from the structure, making it possible to weigh the freezing tank 1 including the water 3 to be cooled. Freezing tank 1
The water level of the cooling water is always maintained at a constant level by an overflow hole 7 provided in the freezing tank.

Next, since the water to be cooled is removed only from the portion where the cooling pipe 2, heat insulation protection plate 6, and other structures are immersed in the water to be cooled before starting the freezing operation, the weight of only the freezing tank and the unfrozen state are The weight sum W1 of the water and the water to be cooled is weighed. As the freezing progresses, if the specific volume of ice α = 1.09, the specific gravity of the cooling water is 1, so the volume expands by the specific volume due to the amount of freezing, and the water to be cooled is removed from the overflow hole 7. flood. The weight W2 at that time is the sum of the weight of the freezing tank and the weight of the water to be cooled after overflowing. If the frozen weight in this case is X, the frozen volume is αX, and only αX−X is the amount of water that overflows. That is, the weighed weight difference W1-W2=αX-X, and X=(W1-
W2)/(α-1) is calculated.

The latent heat from ice 0℃ to water 0℃ is 79.68kcal/Kg
Therefore, the amount of cold storage heat can be calculated by multiplying this amount of latent heat by the frozen weight By calculating the addition of sensible heat with a calculation device, it is possible to measure and display the total cold storage heat amount for the temperature at which the cooled water is used, or to perform operational control based on this. It is something that can be done.

In this explanation, we have described the case where water is not being supplied from the water supply pipe 9, but even during operation when water is being supplied, constant value control of the water level is automatically performed due to water overflowing from the overflow hole. Needless to say, because of the nature of the data, continuous calculations, displays, and control based on these operations are performed.

In order to further improve the measurement accuracy, it is better to measure the temperature distribution inside the water to be cooled and the freezing tank, and perform calculations that take into account their expansion coefficients.

As described above, the present invention is capable of continuously measuring and indicating the amount of ice that has formed on the surface of the cooling pipe or the total amount of cold storage heat.The measurement principle is based on the change in specific volume during freezing, In other words, it is sufficient to calculate the amount by which the volume has expanded, but it is also possible to calculate the weight of the amount of water to be cooled that is removed by this, and the sum of the weight of the freezing tank and the water to be cooled that is filled inside it. By comparing and weighing before and after freezing and calculating the difference, it is possible to increase the accuracy of measuring the amount of ice and also the amount of cold heat storage. It is something.

[Brief explanation of the drawing]

The figure is a schematic cross-sectional view showing the principle of the present invention. 1: Freezing tank, 2: Cooling pipe, 3: Cooled water, 4:
Freezing, 5: Heat insulation protection plate, 6: Heat insulation protection plate support rod,
7: Overflow hole, 8: Drain pipe, 9: Water supply pipe, 10: Weighing sensor, 11: Support beam, 12:
Computing device.

Claims (1)

[Scope of utility model registration request] In the ice formation measuring device, which calculates the amount of ice formation from the weight of the amount of water removed from the water to be cooled due to the change in the volume of ice that grows on the surface of the cooling tube, the cooling tube containing the ice that has grown on the surface of the cooling tube, and The structure consists of a heat insulating protection plate that prevents abnormal growth of ice on the inner wall surface of the tank, and a water supply and drainage pipe that is placed in a non-contact state with the freezing tank, which are separated from the freezing tank and supported, and the freezing tank is equipped with an overflow mechanism. 1. A freezing amount measuring device comprising: a weighing sensor that weighs the weight of a freezing tank filled with water to be cooled; and a calculation device that calculates a weighing difference before and after freezing based on the weighing.