JPH0610549B2 - Cooling system using ice water - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cooling device, and more particularly to an ice-water cooling device that skillfully adapts a large cooling capacity by ice and a low operating cost by circulating water. Is.

<< Conventional technology >> In a cooling system for cooling and dehumidifying houses and buildings,
Conventionally, a method of accumulating cold heat with cold water or ice, taking out this cold heat as cold water, and circulating the cold water through a cooling load such as a cooling machine or a heat exchanger has been the mainstream.

However, in this system, for example, as shown in FIG. 3, while the ice heat storage tank 1 reaches the cooling load 3 via the pump 2,
Cold water at 4 ° to 5 ° C rises to about 7 ° C.

This cold water is used for cooling with a cooling load 3, heated to about 12 ° C., and circulated in the ice heat storage tank 1. Therefore, the difference in temperature of cold heat utilization in the cooling load 3 is at most about 5 ° C, and the cooling capacity is extremely low.

In order to increase the cooling capacity of the cooling load 3 with this method,
The cooling load 3 as well as the cooling load 3 from the ice storage tank 1 to the cooling load 3 and the piping 3 from the cooling load 3 to the ice storage tank 1 have a large diameter, and the capacity and power of the pump 2 are increased to provide a large amount of cold water. Need to be circulated.

Therefore, recently, instead of the above method, a method of accumulating cold heat with liquid ice (a sherbet-like mixture of ice particles and water) and circulating this liquid ice directly to a cooling load has been receiving attention.

In this method, the ice particles in the liquid ice have latent heat, so the cooling capacity is higher than the method of circulating the cold water described above, not only in the cooling load but also from the ice heat storage tank to the cooling load,
Not only can the pipes from the cooling load to the ice heat storage tank be made thin, but the pumps installed in these pipes can be made to have a small capacity and a small power.

<< Problems to be Solved by the Invention >> However, in the method of directly circulating the liquid ice in the cooling load, since liquid ice containing ice particles and having an extremely low temperature of 0 ° C or less flows in the pipe, It is necessary to use piping made of a material that can withstand the impact of ice particles and extremely low temperatures.

However, the cost of piping made of such materials is high, and if the piping built in the cooling load (that is, the coil that is very long if made straight) is manufactured with this high-cost piping material, the equipment cost can be reduced. I can't.

On the other hand, even if low-cost pipe materials can be provided by improving pipe manufacturing technology, the method of directly circulating the liquid ice to the cooling load causes ice particles to clog inside the pipes, the connection parts of the pipes, etc. It may cause an accident that lowers and sometimes stops the equipment.

In addition, the system in which the liquid ice is directly circulated to the cooling load has problems such as being uneconomical and unable to respond immediately when the load fluctuation of the cooling load is large.

That is, when the cooling load is a small load, the ice particles in the liquid ice do not melt and circulate between the ice heat storage tank and the cooling load. Power costs increase.

On the other hand, when the cooling load is heavy, the liquid ice in the ice heat storage tank melts rapidly and disappears, making it impossible to cool for the required time. If the capacity of the ice storage tank is increased in anticipation of this heavy load, the facility cost cannot be reduced. Also, it is possible to generate liquid ice during cooling load, but not only the advantage of using cheap nighttime electricity for liquid ice generation disappears, but the water in the ice heat storage tank goes to the ice making device, The required amount of liquid ice must be sent to the cooling load, and the control system becomes extremely complicated.

The present invention has been made in view of the above problems, and an object of the present invention is to propose an ice water cooling system that skillfully adapts a large cooling capacity by ice and a low operating cost by circulating water. It is in.

<< Means for Solving the Problem >> In order to achieve the above object, the ice water cooling apparatus according to the present invention connects the inflow / outflow end of the main pipe to the ice storage tank or the ice making machine, and through the main pipe. Characterized in that ice and water in the ice heat storage tank or the ice making machine are circulated, and a cooling load is connected to a predetermined position of the main pipe through an ice water separating means capable of passing only water. To do.

<< Operation >> In the present invention, water or liquid ice containing shards of ice (hereinafter referred to as ice pieces) is caused to flow from the ice heat storage tank or the ice maker to the main pipe.

For the ice piece-containing water or liquid ice flowing in the main pipe, ice particles in the ice pieces or the liquid ice are separated by the ice water separating means provided at a predetermined position of the main pipe, and only the cold water is a cooler or a heat exchanger. It is sent to a cooling load such as the above, is subjected to the use of cold heat to raise the temperature, and then returns to the main pipe again.

In this way, the temperature-raising water after being sent to the cooling load and being subjected to the utilization of cold heat gradually melts the ice pieces or the ice particles in the main pipe, and finally the main pipe becomes only the temperature-raising water. And
It returns to the heat storage tank or ice machine and is reused for ice making when the cooling load is stopped at night or during the cooling load operation such as daytime.

In this way, since only cold water is supplied to the cooling load,
There is no clogging of ice particles within the cooling load. Moreover, since the ice chips and the like are contained in the cold water in the main pipe (up to the vicinity of the cooling load), the temperature is kept at approximately 0 ° C.

<< Embodiment >> FIG. 1 shows a preferred embodiment of the cooling device using ice water according to the present invention. In this embodiment, three cooling loads 3a to 3c are provided for one ice heat storage tank 1. ing.

Specifically, an ice water pump 4 capable of pumping out both ice and water is arranged in the ice heat storage tank 1, and the inflow side end of the main pipe 5 is connected to the ice water pump 4. On the other hand, the outflow side end of the main pipe 5 is located above the ice heat storage tank 1, and the ice and water circulated in the main pipe 5 are returned to the ice heat storage tank 1 again.

An ice water separator 6 as an ice water separating means is arranged at a predetermined position of the main pipe 5. A first cooling load 3 a is connected to the tip of the ice water separator 6 via the forward pipe 7. A return pipe 8 is provided between the first cooling load 3 a and the main pipe 5 in parallel with the forward pipe 7. The ice water separator 6, the forward pipe 7, the first cooling load 3a and the return pipe 8 constitute a path for branching and circulating the cold water in the main pipe 5. A water pump 9 is arranged at an intermediate position of the return pipe 8 in order to force the circulation.

Similarly, the second and third cooling loads 3b and 3c are also connected to the main pipe 5 by the ice water separator 6, the outward pipe 7, the return pipe 8 and the water pump 9, respectively.

Furthermore, each part will be described in detail. An opening 5a is formed at a predetermined position on the side wall of the main pipe 5, and a connecting pipe 5b (outwardly connected to the connecting pipe 5b that continuously protrudes outward from the opening 5a). Has a large diameter).

Further, the ice water separator 6 includes a reducer pipe 6a whose diameter is gradually reduced toward the tip, and the reducer pipe 6a.
And a filter member 6b disposed at the inflow side opening of the. Then, as the filter member 6b, for example, a wire net or a punching metal is used.
The size of the eyes provided on the filter member 6b is
It is appropriately selected so that ice pieces flowing in the main pipe 5 and ice particles in the liquid ice do not pass through. Further, the diameters of both openings of the ice water separator 6 are formed to be substantially the same as those of the connecting pipe 5b and the outgoing pipe 7 to be connected, and the connection with the connecting pipe 5b and the like is made through flanges formed at both ends. It is supposed to be done.

Further, in this embodiment, a temperature detector 9 is provided in the main pipe 5 near the branch point from the main pipe 5 to the final third cooling load 3c, and the temperature detection controller 9 and the ice water pump 4 described above are provided.
And are electrically connected, and the supply amount can be controlled according to the measured temperature.

The operation of the present embodiment configured as described above will be described below.

First, the ice water pump 4 is operated, and the ice heat storage tank 1 to the main pipe 5
Inject water containing ice chips or liquid ice.

This ice piece-containing water or liquid ice is separated into ice pieces or ice particles by the ice water separator 6 associated with the first cooling load 3a, and only the cold water passes through the filter member 6b and enters the outward pipe 7, where the water pump 9 And passes through the coil in the first cooling load 3a. The cold water that has been taken out of the cold heat and has increased in temperature while passing through this coil returns to the main pipe 5 through the return pipe 8, and the main pipe 5
Combine with ice-containing water or liquid ice.

Similarly, only the cold water is sent to the second and third cooling loads 3b and 3c, and after the cooling extraction is completed, it is returned from the main pipe 5 to the ice heat storage tank 1.

In this way, in the main pipe 5, the ice pieces or ice particles gradually melt due to the temperature-rising water returned from each return pipe 8, but the water temperature of 0 ° C. is maintained while the ice pieces or ice particles remain even slightly. Retained.

Therefore, the main pipe 5 is arranged so that the ice pieces or ice particles remain near the branch point to the outward pipe 7 related to the final third cooling load 3c.
If the amount of ice water in the inside is controlled, the cold water of 0 ° C. is always supplied to any of the cooling loads 3a to 3c.

Therefore, the temperature detection controller 9 provided in the vicinity of the branch point to the third cooling load 3c detects the temperature of the cold water in the main pipe 5, and sends this detection signal to the ice water pump pipe 4 to detect this temperature. The amount of ice water pumped out is controlled so that the temperature is always 0 ° C.

Note that the ice heat storage tank may be omitted, and cold water may be mixed with ice produced by an ice making machine and directly sent to the main pipe 5.

Further, the cooling load provided in the ice heat storage tank or the like is not limited to three as in the above-described embodiment, and only one may be provided.

<Effects of the Invention> As described above, in the cooling device according to the present invention, ice-laden water or liquid ice is sent to the so-called secondary side of the cooling load, so latent heat of ice and sensible heat are used on the secondary side. It is possible, and the difference in cold heat utilization temperature becomes large.

Along with this, the piping on the secondary side has a small diameter.
A large cooling capacity can be obtained even if the secondary pump has a small power.

Further, since only cold water is circulated to the cooling load, the coil in the cooling load only needs to withstand cold water of, for example, about 2 ° C., and it is not necessary to use a high-cost pipe material. Moreover, there is no possibility that ice pieces or the like will be blocked in the cooling load.

Further, even if the cooling load becomes a heavy load, the ice piece-containing water having a large cold heat capacity is sent to the secondary side, so that the large load can be dealt with immediately. Further, when the load is small, a small amount of cold water may be placed in the cooling room, so that the pump power is not wasted.

In the present invention, the ice storage tank is omitted to convey ice piece-containing water or liquid ice from the ice making machine to the main pipe,
When the cold water heated by the cooling load is directly returned to the ice making machine, the ice making can be easily performed even during the cooling load operation without requiring a complicated control system.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of an ice-water cooling device according to the present invention, and FIG. 2 is an explanatory view showing an embodiment of an ice-water separator used in the ice-water cooling device of FIG. FIG. 3 is an explanatory view showing a conventional chilled water circulation type cooling device. 1 ... Ice heat storage tank 3a to 3c ... 1st to 3rd cooling load 4 ... Ice water pump, 5 ... Main pipe 6 ... Ice moisture container, 7 ... Forward pipe 8 ... Return pipe, 9 ... … Water pump

Claims (1)

[Claims] 1. An inflow / outflow end of a main pipe is connected to an ice heat storage tank or an ice making machine, and ice and water in the ice heat storage tank or the ice making machine are circulated through the main piping, and the main pipe. An ice-cooling system using ice water, characterized in that a cooling load is connected to a predetermined position of the cooling water through an ice-water separating means that allows only water to pass therethrough.