JPS58145837A - Operation of ice cooling system - Google Patents

Abstract

PURPOSE:To make it possible to obtain a stabilized amount of ice cooling by a method wherein the level of water in a heat accumulation tank at the time of starting a refrigerator is determined as a reference water level and when the amount of variation of the water level exceeds a predetermined value, the refrigerator is stopped. CONSTITUTION:An ice making coil 2 connected to the refrigerator 3 is arranged within the heat accumulation tank 1, the ordinary level of the water in the tank 1 is measured by a level gauge 8 and the refrigerator 3 is started or stopped by a control device 6 in proportion to the amount of variation of the water level. In this case, the level 9 of the water at the time of starting the refrigerator 3 is stored as the reference water level Lo, then the difference DELTAL between a water level L' determined by correcting the variation of the water level due to the operation of a circulation pump supplying water to an air conditioner 7, and the reference water level Lo is obtained (DELTAL=Lo-L') and when the difference DELTAL (the amount of variation of water level ) exceeds a predetermined value S, the refrigerator 3 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION An ice cold storage system that stores cold energy by freezing water in a heat storage tank is used as a type of air conditioning facility.

Using such an ice cold storage system, for example, you can generate a large amount of cold energy at a low cost by operating a refrigerator at night to create ice and store it, and then melting this ice during the day to cool the room. It's advantageous. It has already been proposed to control the start and stop of this refrigerator, that is, the start and stop of cold storage, by the water level (absolute water level) in the heat storage tank. However, the amount of water (that is, the water level) in the heat storage tank changes depending on the water supply to the air conditioner, evaporation, leakage, or leakage of water, and the presence or absence of make-up water. cannot be stabilized, and there may be cases where only an amount of cold energy smaller than the predetermined amount of cold energy can be stored, or a case where the refrigerator does not stop even if all the water freezes.

The present invention aims to solve such inconveniences. That is, according to the present invention, in a method of operating an ice cold storage system that freezes water in a heat storage tank to store cold energy, the water level in the heat storage tank at the time of starting the refrigerator for cold storage is stored as a reference water level, and thereafter, the water level is always stored. The method of operating an ice cold storage system is characterized in that the water level is measured and the operation of the refrigerator is stopped when the amount of water level fluctuation is equal to or greater than a set value. According to the operating method of the present invention, since control is performed based on the amount of water level variation (relative water level) from the reference water level at the time of starting the refrigerator, the amount of cool storage does not decrease depending on the situation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 1, the air conditioning facility that implements the present invention is an air conditioner? and a heat storage tank l that supplies heat exchange water to the air conditioner. An ice-making coil coil is installed inside the heat storage tank.
This ice-making coil co-cooler uses a refrigerant such as 7 Leon.
Circulate more. This refrigerator 3 is connected to a cooling tower l.

The water level 9 in the heat storage tank/ is, for example, the pump 1 to the air conditioner 7.
0 is in operation and water is being supplied, when there is evaporation, leakage, or leakage of water, and when make-up water is supplied from a pipe (not shown), etc., K changes. It is inconvenient to ignore this variation and try to stop the refrigerator when a constant water level (absolute water level) is reached due to water level changes resulting from volumetric expansion due to freezing. In other words, even if all of the water freezes, the refrigerator may not stop, or there may be cases where the amount of cold heat is less than the predetermined amount of cold heat or cold storage is not possible.

According to the present invention, the water level 9 in the heat storage tank l is constantly measured by the water level gauge g, and this measurement signal is guided to the control system based on the amount of water level change to turn on and off the power to the refrigerator 3. At this time, the electronic circuit performs calculations as shown in FIG.

That is, as shown in the flow sheet of FIG. 1, the standard water level LO at the time of starting the refrigerator is measured with a water level meter and stored. Next, constantly measure the entire water level, and if necessary, correct this water level (for example, if the pump to the air conditioner system is in operation, the water level will drop, so correct it) (correction water level L). Find the difference ΔLi from the reference water level Lo,
This is compared with the set value S. Is this difference ΔL equal to the set value S? ! or when it becomes larger than this, the refrigerator is stopped.

As described above, according to the present invention, even if the amount of water in the heat storage tank changes, the water level change due to ice making is calculated and the ice making refrigerator is started and stopped based on the amount of water level fluctuation (relative water level), so the control can be performed accurately. I can do it.

Although the present invention has been described above in detail with reference to its preferred embodiment, the present invention is not limited to this specific embodiment, and it goes without saying that many changes and modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a system diagram of an air conditioning facility having an ice cold storage system, and FIG. 2 is a 70-sheet diagram of the method of the present invention. /... Heat storage tank, Co... Ice making coil, 3... Freezer, q...
・Cooling tower, 6. Control device based on water level fluctuation, ri.. Air conditioner, g.. Water level gauge, 9.. Water level, io.. Pump. Figure 1 Figure 2

Claims (1)

[Claims] In a method of operating an ice cold storage system that freezes water in a heat storage tank to store cold energy, the water level in the heat storage tank at the time of starting the refrigerator for cold storage is stored as a reference water level, and the water level is then constantly measured; A method of operating an ice cold storage system, characterized in that the operation of the refrigerator is stopped when the amount of water level fluctuation becomes equal to or greater than a set value.