JP2593502B2 - Cooling / heating medium circulation equipment using ice-water mixed fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cooling medium circulating apparatus using an ice-water mixed fluid.
They are connected in parallel via a circulation path, and as a cooling medium circulation through the circulation path, an ice water mixed fluid in which ice and water are mixed is supplied from the cold heat supply section to each of the cold heat consumption sections, and the cold heat consumption section The present invention relates to a cooling medium circulating system using an ice-water mixed fluid, wherein the ice of the supplied ice-water mixed fluid is melted with the consumption of cold heat, and the water containing the melted water is returned to the cold heat supply section.

[Conventional technology]

Conventionally, as a cooling medium circulating device generally used for cooling or the like, as shown in FIG. 6, low-temperature chilled water generated by a refrigerator R in a cooling and heating supply unit 1 is supplied to each of a plurality of cooling and heat consuming units 2 as a feeding cooling and heating medium. On the other hand, each of the cold heat consuming units 2 consumes the supplied cold heat (sensible heat) of the supplied low-temperature chilled water for an intended purpose such as cooling, and then cools the chilled water heated by the cold heat consumption. The return heat medium was returned to the refrigerator R of the cold heat supply unit 1.

In recent years, for the purpose of reducing the diameter of a pipe forming the cooling medium circulation path and the cooling medium transport pump, a type using an ice water mixed fluid as a cooling medium has been proposed. As shown in the figure, in the cold heat supply unit 1, ice is generated by a refrigerator R (ice machine), a mixed fluid of the ice and water is stored in a heat storage tank W, and the heat storage tank W
Supplies the ice-water mixed fluid as a feed cooling heat medium to each of the cold heat consuming units 2, whereas in each of the cold heat consuming units 2, the ice of the supplied ice-water mixed fluid is melted with cold heat consumption,
The water containing the molten water is returned to the heat storage tank W of the cold heat supply unit 1 as a return cooling medium.

[Problems to be solved by the invention]

However, in a conventional general cooling medium circulating system that supplies low-temperature chilled water as a feed cooling medium to the chilled heat consuming unit, the chilled heat consumption of each chilled heat consuming unit is determined based on the difference between the inlet and outlet temperature of the chilled water at each chilled heat consuming unit and the receiving flow rate. Although the amount can be determined, in a cooling medium circulation system using an ice-water mixed fluid, even if the ratio of ice to water in the ice-water mixed fluid changes, as long as the ice is present, the temperature of the mixed fluid is constant (the melting point of ice) ), The water returned from each cold heat consuming unit to the cold heat supply unit may contain residual ice or may be extremely hot due to the absence of ice due to fluctuations in the cold heat consumption in each cold heat consuming unit. For the unstable state change, and for the unstable fluctuation of the ice / water ratio of the ice-water mixed fluid itself supplied from the cold heat supply unit to each cold heat consumption unit, Temperature difference (ice water Temperature difference between the receiving temperature of the combined fluid and the temperature of the water returned to the cold-heat supply unit) and the flow rate of receiving the ice-water mixed liquid, the cold-heat consumption of each cold-heat consuming unit could not be determined. Judgment of the amount of cold heat consumed in each cooling heat consuming unit, such as district cooling, which supplies a cooling medium to a plurality of buildings equipped with cooling equipment serving as a cooling heat consuming unit from an energy supply center serving as a cooling heat consuming unit, for charge settlement, etc. In the field where it is required, in implementing the method of using the ice-water mixed fluid, it is required to establish a technique for accurately determining the amount of cold heat consumed in each cold heat consuming unit.

In view of the above circumstances, the main object of the present invention is to streamline the supply of the ice-water mixed fluid from the cold heat consuming unit and the reception of the ice-water mixed fluid in each cold heat consuming unit, thereby reducing the cold heat consumption in each cold heat consuming unit. The point is that the amount can be easily and accurately determined based on the flow rate of the ice-water mixed fluid received in each cold heat consuming unit.

[Means for solving the problem]

(Invention according to claim 1) A characteristic configuration of the present invention according to claim 1 is that a plurality of cold heat consuming units are connected in parallel to a cold heat supply unit via a circulation path, and the cooling medium As the circulation, an ice-water mixed fluid obtained by mixing ice and water is supplied to each of the cold heat consuming units from the cold heat supplying unit, and the ice of the supplied ice-water mixed fluid is cooled and consumed from each of the cold heat consuming units. In the configuration in which the water containing the molten water is returned to the cold heat supply section, the cold heat supply section includes mixing means for mixing ice and water at a predetermined ratio, and the predetermined ice water generated by the mixing means. An ice-water mixed fluid having a mixing ratio is supplied to the cold heat consuming unit, and each of the cold heat consuming units has a balance between the amount of cold heat consumed by the cold heat consuming unit and the amount of cold heat received by receiving the ice-water mixed fluid. Detection means for detecting Flow adjusting means for automatically adjusting the receiving flow rate of the ice-water mixed fluid so that only ice-free water having a predetermined temperature equal to or higher than the temperature of the receiving ice-water mixed fluid is returned to the cold heat supply unit based on the detection information of the detecting means. And has been provided.

(Invention according to claim 2) The feature configuration of the invention according to claim 2 is the invention according to claim 1, wherein the cold heat consuming unit receives and stores the ice water mixed fluid supplied from the cold heat supply unit, An auxiliary ice heat storage tank for extracting water to be returned to the cold heat supply unit from the lower part of the tank, and a cold heat consumption executing unit for extracting and consuming the stored cold energy of the stored ice water mixed fluid from the auxiliary ice heat storage tank; An ice amount detection sensor for detecting the amount of ice stored in the auxiliary ice heat storage tank is used as the detection means, and the amount of ice stored in the auxiliary ice heat storage tank is set to a permissible variation based on information detected by the ice amount detection sensor. The present invention is configured to automatically adjust the flow rate of receiving the ice-water mixed fluid into the auxiliary ice heat storage tank so as to keep the flow rate within the range.

(Invention according to claim 3) In the characteristic configuration of the invention according to claim 3, in the invention according to claim 1, the flow rate adjusting unit detects a temperature of water returned from the cold heat consuming unit to the cold heat supplying unit. A temperature sensor is used as the detection means, and the temperature of the water returned from the cold heat consuming unit to the cold heat supplying unit is set to a temperature higher than the temperature of the receiving ice water mixed fluid based on the detection information of the temperature sensor. To keep the temperature
The present invention is configured to automatically adjust the flow rate of receiving the ice-water mixed fluid to the cold heat consuming unit.

(Invention according to claim 4) According to a feature configuration of the invention according to claim 4, in the invention according to any one of claims 1 to 3, the mixing unit is configured to supply ice manufactured by an ice machine to the cold heat consuming unit. An ice heat storage tank that stores the ice water from the upper part of the ice heat storage tank and water extracted from the lower part of the tank at a predetermined ratio by a valve device to generate an ice-water mixed fluid. There is to be.

(Invention according to claim 5) The characteristic configuration of the invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the ice-water mixed fluid in the main supply pipe of the ice-water mixed fluid from the cold heat supply unit. A pressure sensor for detecting a supply pressure of the ice-water mixed fluid from the cold-heat supply unit so that a supply pressure of the ice-water mixed fluid in the main supply pipe becomes a predetermined value based on detection information of the pressure sensor. Main flow rate adjusting means for automatically adjusting the flow rate is provided.

(Operation)

(Operation of the invention according to claim 1) In the characteristic configuration of the invention according to claim 1, in the cold heat supply unit, ice and water are mixed at a predetermined ratio by a mixing means to generate an ice-water mixed fluid, and the predetermined ice-water mixture is generated. A ratio of ice water mixture fluid is supplied in parallel from the cold heat supply section to each cold heat consuming section via the outward path of the circulation path.

On the other hand, in each cold heat consuming unit, the detecting means detects a balance state between the cold heat consumption amount in the cold heat consuming unit and the cold heat receiving amount by receiving the ice-water mixed fluid (that is, a balance state of both), and On the basis of this detection information, the flow rate adjusting means returns only the ice-free water having a predetermined temperature equal to or higher than the temperature of the received ice-water mixed fluid to the cold heat supply unit via the return path of the circulation path, so as to return to the cold heat supply unit. Automatically adjust the receiving flow rate of the ice-water mixed fluid.

That is, by automatically adjusting the receiving flow rate, the amount of cold heat received by receiving the ice-water mixed fluid is balanced with respect to the amount of cold heat consumed by each of the cold-heat consuming units, so that only ice-free water becomes the temperature of the received ice-water mixed fluid. At the above-mentioned predetermined temperature, the operation state sent from each cooling and heat consuming unit is maintained.

(Operation of the invention according to claim 2) In the characteristic configuration of the invention according to claim 2, in the cold heat consuming unit, the ice-water mixed fluid supplied from the cold heat supply unit is received and stored in the auxiliary ice heat storage tank, and the auxiliary ice heat storage tank is stored. The stored cold water of the stored ice water mixed fluid in the tank is taken out by the cold heat consumption execution unit and consumed for the intended purpose such as cooling, and in accordance with this, water containing the melting water of ice is taken out from the lower part of the auxiliary ice heat storage tank. This water is returned to the cold heat supply unit.

In this cold heat consumption mode, in the cold heat consuming section, when the amount of cold heat received by the reception of the ice-water mixed fluid is excessively large compared to the cold heat consumption, the amount of stored ice in the auxiliary ice heat storage tank tends to increase, and Conversely, if the amount of cold heat received by receiving the ice-water mixed fluid is too small compared to the amount of cold heat consumed, the amount of ice stored in the auxiliary ice heat storage tank tends to decrease. As the detection of the balance between the amount of ice and the amount of cold heat received, the amount of ice stored in the auxiliary ice heat storage tank is detected by the ice amount detection sensor, and based on this detection information, the flow rate adjusting means causes By automatically adjusting the amount of ice-water mixed fluid received into the auxiliary ice heat storage tank so that the amount of ice stored is within the set allowable fluctuation range, the temperature of the received ice-water mixed fluid can be increased. Constant temperature (in particular, this case is approximately equal temperature and the temperature of the receiving ice-water mixed fluid) only water ice not exist in, to keep the state back to the cold supply unit from the vessel lower part of the auxiliary ice heat storage tank.

(Operation of the invention according to claim 3) In the characteristic configuration of the invention according to claim 3, in the cold heat consuming portion, of the cold heat of the received ice water mixed fluid, a part of the sensible heat of water in addition to the latent heat of ice. Consume.

In this cold heat consumption mode, in the cold heat consuming unit, the amount of cold heat received by the reception of the ice-water mixed fluid is excessively large as compared with the cold heat consumption, and the amount of sensible heat (cool heat) of water after melting of ice becomes too small. However, the temperature of water returned to the cold heat supply unit tends to decrease, and conversely, the amount of cold heat received by the reception of the ice-water mixed fluid is too small compared to the cold heat consumption, and the sensible heat (cold heat) of water after melting of ice is consumed. When the amount is excessive, the temperature of the water returned to the cold heat supply unit tends to increase, and as a detection of the balance between the cold heat consumption amount and the cold heat reception amount by the detection unit, a temperature sensor detects the balance between the cold heat consumption unit and the cold heat consumption unit. The temperature of the water returned to the cold heat supply unit is detected, and based on this detection information, the temperature of the water returned from the cold heat consuming unit to the cold heat supply unit is higher than the temperature of the received ice water mixed fluid by the flow rate adjusting unit. Set to temperature It said to maintain a predetermined temperature as the acceptance rate of ice-water mixed fluid by automatically adjusting,
A state in which only ice-free water having a predetermined temperature equal to or higher than the temperature of the receiving ice-water mixed fluid (particularly, a constant temperature set higher than the temperature of the receiving ice-water mixed fluid) is returned from the cold heat consuming unit to the cold heat supplying unit. To keep

(Operation of the Invention According to Claim 4) In the characteristic configuration of the invention according to claim 4, as the generation of the ice-water mixed fluid by the mixing means in the cold heat supply unit, the ice generated by the ice making machine is returned from the cold heat consumption unit. An ice-water mixed fluid having a predetermined ice-water mixing ratio is stored by storing a predetermined amount of ice and water taken out from the upper part of the ice storage tank together with water stored in an ice storage tank together with water at a predetermined ratio using a valve device. Is generated, and this ice-water mixed fluid is supplied from the cold heat supply unit to each of the cold heat consumption units.

(Operation of the invention according to claim 5) In the characteristic configuration of the invention according to claim 5, in the main supply pipe of the ice-water mixed fluid from the cold heat supply section (that is, the supply pipe before branching to each cold heat consumption section). The supply pressure of the ice-water mixed fluid is detected by a pressure sensor. Then, based on this detection information, the main pipe flow rate adjusting means causes the supply pressure of the ice-water mixed fluid in the supply main pipe to be a predetermined value.
Automatically adjusts the amount of ice water mixed fluid supplied from the cold heat supply unit,
Accordingly, the change in the total amount of the received ice-water mixed fluid on the side of the cold-heat consuming unit changes, so that an appropriate amount of the ice-water mixed fluid corresponding to the total is supplied from the cold-heat supply unit.

〔The invention's effect〕

(Effects of the Invention According to Claim 1) According to the invention according to claim 1, an ice-water mixed fluid having a predetermined ice-water mixing ratio (i.e., since the ice-water mixing ratio is constant, Is supplied to each of the cold heat consuming units, and in each of the cold heat consuming units, the flow rate adjusting unit automatically adjusts the receiving flow rate so that the temperature of the received ice / water mixed fluid is equal to or higher than the temperature of the receiving ice / water mixed fluid. Since only ice-free water (that is, water with a fixed amount of cold heat per unit flow (the remaining amount of cold heat) is constant because ice is absent and the temperature is constant) is returned to the cold heat supply unit, Under the automatic adjustment of the receiving flow rate by the flow rate adjusting means, the cold heat consumption in each cold heat consuming section and the receiving flow rate of the ice water mixed fluid have a certain proportional relationship, and therefore, the ice water mixed fluid in each cold heat consuming section If the acceptance flow rate is grasped by any method, it is possible to easily and accurately determine the amount of cold heat consumed in each of the cold heat consuming units based on the accepted flow rate.

And, by being able to easily and accurately determine the amount of cold heat consumed in each of the cold heat consuming units based on the flow rate of the received ice-water mixed fluid, it is possible to accurately determine the amount of cold heat consumed in each of the cold heat consuming units. In fields such as the above-mentioned other-area cooling required, it is possible to promote implementation of a method of using an ice-water mixed fluid as a supply cooling medium.

In addition, although it is a bellows, the detecting means in each cold heat consuming unit only needs to detect the balance (balance state) between the cold heat consumption and the cold heat receiving amount by receiving the ice water mixed fluid. As can be seen from the operation of the invention and the operation of the invention according to the third aspect, this detection means does not need to quantitatively measure the amount of cold heat consumption itself in the cold heat consuming unit.

According to the first aspect of the present invention, as an additional effect, it is possible to prevent the water returned from each cold heat consuming unit to the cold heat supplying unit from containing residual ice, thereby reducing the amount of water returned to the cold heat consuming unit. The heat loss of cold heat can be suppressed, the energy efficiency of the equipment can be improved, and the temperature of the water returned to the cold heat supply unit can be prevented from deviating significantly higher than the required temperature of each cold heat consumption unit. Thus, the performance of each cooling heat consuming unit can be stably exhibited for the intended cooling heat consuming purpose.

(Effects of the Invention According to Claim 2) According to the invention according to claim 2, a constant operation that is substantially equal to the temperature of the receiving ice-water mixed fluid while preventing the water returned to the cold heat supply unit from containing residual ice. By maintaining the temperature (that is, without increasing the temperature of the cooling medium used), the cooling heat consuming unit can function stably at the lowest temperature in the circulating equipment, and the cooling heat consuming unit operates the auxiliary ice storage tank. By providing, even in the case of a sudden increase in the cold energy consumption, the cold energy stored in the auxiliary ice heat storage tank is used to cope with the rapid increase in the cold energy consumption. It can be made to function stably, and by these, the high performance of the cold heat consuming part can be achieved.

(Effect of the Invention According to Claim 3) According to the invention according to claim 3, in detecting the balance between the cold heat consumption and the cold heat acceptance, the temperature of the water sent from the cold heat consuming unit is detected by the temperature sensor. Since the detection method is very simple, the equipment cost can be reduced.

Further, the present invention can be easily applied to a case where the cold heat consuming unit does not include the auxiliary ice heat storage tank as described above, but simply exchanges heat with the ice water mixed fluid, the cooling target fluid, and the heat exchanger. In this respect, versatility can be improved in this respect.

(Effect of the invention according to claim 4) According to the invention according to claim 4, in the cold heat supply unit,
Since the ice generated by the ice making machine and the return water from the cold heat consuming unit are stored in the ice heat storage tank, even for a sudden increase in the amount of ice water mixed fluid received on the cold heat consuming unit side,
With the ice and water stored in this ice heat storage tank, the supply function of the ice-water mixed fluid of the cold-heat supply unit is stabilized in a form to cope with the sudden increase in the amount of the ice-water mixed fluid received on the side of the cold-heat consuming unit. Can be kept.

Also, ice and water taken out from the upper and lower portions of the ice heat storage tank are combined at a predetermined ratio by a valve device to generate an ice-water mixed fluid having a predetermined ice-water mixing ratio. The ratio of the ice and water (the above-mentioned predetermined ratio) of the ice-water mixed fluid to be sent to the consuming unit side can be easily changed as required.

(Effect of the invention according to claim 5) According to the invention according to claim 5, the supply pressure of the ice-water mixed fluid in the main supply pipe is maintained at a predetermined value, and the cold-water consuming unit receives the ice-water mixed fluid. The ice-water mixed fluid is supplied from the cold heat supply unit in proportion to the total amount, so the supply pressure of the ice-water mixed fluid in the supply main pipe is required when the total amount of the ice-water mixed fluid received at the cold heat consuming unit decreases. It is possible to stably supply each required amount of the ice-water mixed fluid to each cold-heat consuming unit while avoiding the increase in the above-mentioned height and preventing the waste of the fluid transfer power.

In addition, since the supply amount of the ice-water mixed fluid is automatically adjusted based on the pressure detection in the supply main pipe, the received amount of the ice-water mixed fluid in each cold heat consuming section is transmitted from each cold heat consuming section, and the ice water mixed section is transmitted based on this information. The equipment configuration can be simplified as compared with a mode in which the supply amount of the mixed fluid is automatically adjusted.

〔Example〕

 Next, an embodiment will be described.

FIG. 1 shows a schematic system of a district cooling system, in which a cooling medium is circulated and supplied in parallel from an energy supply center 1 to cooling systems 2 in a plurality of cooling target areas via circulation paths 5, 6, and 9. In the cooling target area, cooling is performed by the cooling heat of the supplied cooling medium.

Each cooling target area is a building, a factory, a warehouse, a specific level in a building, or a specific area in a level, and the like.
Further, the cooling performed by the cooling equipment 2 in each of the cooling target areas is not limited to air conditioning for humans, but may be cooling of heat-generating equipment, refrigeration of various things, and the like.

In the energy supply center 1 as a cold heat supply unit,
An ice making facility 3 and a mixing facility 4 as mixing means for mixing the ice (granular or sherbet-shaped ice) produced by the ice making facility 3 with water are installed. As a cooling medium, a mixed fluid of a predetermined mixing ratio of ice and water mixed by the mixing equipment 4 is supplied to the cooling equipment 2 in each cooling target area via the supply main pipe 5 and the supply branch pipe 6.

On the other hand, the cooling equipment 2 in each cooling target area as a cooling heat consuming unit extracts cooling heat from a cooling device 7 as a cooling heat consuming unit and ice-water mixed fluid supplied from the energy supply center 1 and cools the cooling heat. A heat exchange facility 8 for supplying the apparatus 7 is provided. The cooling facility 2 in each cooling target area takes out latent heat (cold heat) of the ice while melting the ice in the heat exchange facility 8 to perform cooling.

Further, in the cooling equipment 2 of each cooling target area, only the water free of ice is used as the return cooling heat medium due to the melting of the ice accompanying the extraction and consumption of the cold heat as described above, and the temperature ti of the receiving ice water mixed fluid is set.
At the above-mentioned predetermined temperature ts, the receiving flow rate of the ice-water mixed fluid from the energy supply center 1 is automatically adjusted by the flow rate adjusting means 10 in accordance with the cold energy consumption so as to be sent to the return pipe 9 to the energy supply center 1. .

 In the figure, reference numerals 11 and 12 are pumps for circulating the cooling medium.

Further, 13 automatically adjusts the feed amount of the ice water mixed fluid from the energy supply center 1 so that the pressure of the main supply pipe 5 (the supply pressure of the ice water mixed fluid) detected by the pressure sensor 14 becomes a predetermined value. The main pipe flow rate adjusting means 13 controls the energy supply center 1 by the main pipe flow rate adjusting means 13, whereas the cooling equipment 2 in each cooling target area adjusts the receiving flow rate of the ice water mixed fluid by the flow rate adjusting means 10 as described above.
Is adjusted to an amount corresponding to the sum of the amounts of the ice-water mixed fluid received in the plurality of cooling facilities 2 (in other words, the amount corresponding to the sum of the required amounts of cooling heat of the plurality of cooling facilities 2). I do.

FIG. 2 and FIG. 3 show an example of the configuration of the ice making facility 3 and the mixing facility 4 installed in the energy supply center 1,
In FIG. 2, the ice making equipment 3 includes an ice maker 15 for producing massive ice, and a first crusher for crushing the massive ice produced by the ice maker 15 into granular ice having a predetermined average particle size. And an ice heat storage tank 17 for storing the granular ice dropped and supplied from the first crusher 16 together with the return water from the cooling equipment 2 in each cooling target area as the mixing equipment 4. The ice in the upper layer is again crushed and taken out while adjusting the particle size, and the second crusher 18 to be joined with the cold water taken out from the lower part of the ice heat storage tank 17 and the amount of ice supplied from the second crusher 18 are adjusted. Further, a valve device 19 for adjusting the mixing ratio of ice and water of the ice water mixed fluid supplied to each cooling equipment 2 to a predetermined value is provided.

On the other hand, in the apparatus shown in FIG. 3, an ice maker 20 for producing sherbet-like ice is provided as the ice maker 3, and
As described above, the mixing equipment 4 is provided with an ice heat storage tank 21 for storing the sherbet-like ice produced by the ice making machine 20 together with the return water from the cooling equipment 2 in each of the cooling target areas. A merging valve device 22 in which the sherbet-like ice taken out from the upper part of the tank 21 and the cold water taken out from the lower part of the ice heat storage tank 21 are joined at a predetermined ratio to form a mixed fluid of ice water and water to be supplied to each cooling equipment 2. Is provided.

4 and 5 show an example of the configuration of the heat exchange equipment 8 in the cooling equipment 2 in each cooling target area. In FIG. 4, the ice-water mixed fluid supplied from the energy supply center 1 is used. An auxiliary ice heat storage tank 23 for receiving and storing is provided. Cold water taken out from the lower part of the auxiliary ice heat storage tank 23 is supplied to the cooling device 7, and return cold water from the cooling device 7 is supplied to the upper part of the auxiliary ice heat storage tank 23. At the same time, the water taken out from the lower part of the auxiliary ice heat storage tank 23 is sent out to the return pipe 9 to the energy supply center 1 as a return cooling heat medium.

In this example, as the detection of the balance between the amount of cold heat consumed and the amount of received cold heat in the cooling equipment 2, the amount of ice stored in the auxiliary ice heat storage tank 23 is detected by the ice amount detection sensor 24. Based on the flow rate adjusting means
According to 10, the automatic valve 25 is adjusted to automatically adjust the amount of the ice-water mixed fluid to be received into the auxiliary ice heat storage tank 23 so that the amount of ice stored in the auxiliary ice heat storage tank 23 is kept within the set allowable fluctuation range. Accordingly, regardless of the change in the cooling heat consumption due to the cooling load fluctuation, only the water free of ice as the return cooling heat medium from the cooling equipment 2 is the predetermined temperature ts (this value) equal to or higher than the temperature ti of the receiving ice water mixed fluid. In such a case, the state of being sent to the return pipe 9 at a temperature ts = ti) substantially equal to the temperature ti of the receiving ice-water mixed fluid is maintained.

In FIG. 4, the auxiliary ice heat storage tank 23 is a closed type, but the auxiliary ice heat storage tank 23 may be an open type.

On the other hand, in the one shown in FIG. 5, a heat exchanger that cools the refrigerant for the cooling device 7 by indirectly exchanging heat between the appropriate refrigerant circulated to the cooling device 7 and the ice-water mixed fluid from the energy supply center 1. 26 is provided, cooling is performed by extracting cold heat while melting the ice by this indirect heat exchange, and, in parallel with this, the water after heat exchange passing through the heat exchanger 26 (that is, (Melted water) is sent to the return pipe 9 to the energy supply center 1 as a return cooling heat medium.

In this example, the temperature sensor 27 detects the balance between the amount of cold heat consumed and the amount of cold heat received by the cooling equipment 2 and detects the temperature of water sent as the return cooling medium by the temperature sensor 27.
is detected, and based on this detection information, the flow rate adjusting means 10 controls the temperature to of the water sent as the return cooling heat medium to
The automatic valve 28 is adjusted to maintain the flow rate of the ice-water mixed fluid into the heat exchanger 26 so as to maintain the predetermined temperature ts which is higher than the temperature ti of the received ice-water mixed fluid (generally, the melting point of ice). This automatically adjusts, so that only water free of ice is used as the return cooling heat medium from the cooling equipment 2 irrespective of a change in the amount of cooling heat due to a change in the cooling load. ts (in this case, a constant temperature set higher than the temperature ti of the received ice-water mixed fluid as described above) is maintained to be sent to the return pipe 9.

(Another embodiment)

 Next, another embodiment will be described.

(A) The water fed from the cold heat supply unit 1 to the cold heat consuming unit 2 together with the ice may be an aqueous solution in which additives are appropriately dissolved.

(B) The mixing ratio of ice and water in the ice-water mixed fluid fed from the cold heat supply unit 1 may be determined as appropriate, and the mixing ratio may be appropriately changed depending on the season or time of day. May be.

(C) In the cold heat consuming section 2, when the cold heat is extracted from the ice-water mixed fluid, the sensible heat (cold heat) of the water (cold water) together with the extraction of the latent heat (cold heat) of the ice as shown in FIG. 4 and a form mainly extracting only the latent heat of ice as shown in FIG. 4 described above, and water (cold heat) may be taken out together with the extraction of the latent heat of ice (cold heat). When extracting the retained sensible heat (cold heat) of the (cold water), the extent to which the retained sensible heat (cold heat) is extracted may be determined as appropriate.

(D) In order to produce ice in the cold heat supply unit 1 and mix the ice and water at a predetermined ratio, various methods and various types of apparatuses can be applied.

(E) Based on the detection of the balance between the cold heat consumption and the cold heat receiving amount, the set temperature ts which is equal to or higher than the temperature ti of the receiving ice water mixed fluid.
The flow rate adjusting means 10 for automatically adjusting the amount of the ice-water mixed fluid to be received by the cold heat consuming unit 2 so that only the ice-free water is sent out from the cold heat consuming unit 2 as a pipe cooling heat medium is provided by various methods. , Model type can be applied.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is an overall system diagram, FIG. 2 and FIG. 3 are equipment configuration diagrams in an energy supply center, and FIG. 4 and FIG. It is an equipment block diagram of the cooling equipment in a cooling target area, respectively. FIG. 6 and FIG. 7 are equipment configuration diagrams each showing a conventional type. (1) Cold heat supply unit, (2) Cold heat consumption unit, (4)
... mixing means, (5,6,9) ... circulation path, (10) ... flow rate adjustment means, (24) ... detection means (ice amount detection sensor), (27) ... detection means (temperature sensor ), (23) ... Auxiliary ice heat storage tank, (7) ... Cool heat consumption execution unit, (17), (21) ... Ice heat storage tank, (19), (22) ... Valve device, (5) ... supply main pipe, (14) ... pressure sensor, (13) ... main pipe flow rate adjusting means.

Claims (5)

(57) [Claims] A plurality of cold heat consuming units (2) are connected in parallel to a cold heat supply unit (1) via circulation circuits (5, 6, 9). As the cooling medium circulation according to 9), an ice water mixed fluid in which ice and water are mixed is supplied from the cold heat supply section (1) to each of the cold heat consuming sections (2), and each of the cold heat consuming sections (2) is provided. , The ice of the supplied ice-water mixed fluid is melted with consumption of cold heat, and the water containing the melted water is returned to the cold-heat supply section (1). The cold heat supply unit (1) includes a mixing means (4) for mixing ice and water at a predetermined ratio, and the ice / water mixed fluid having a predetermined ice water mixing ratio generated by the mixing means (4). (2) is supplied to each of the cold heat consuming units (2). Detecting means (24), (27) for detecting the balance between the cost and the amount of cold heat received by receiving the ice-water mixed fluid; and receiving ice-water mixing based on the detection information of the detecting means (24), (27). To return only the ice-free water having a predetermined temperature (ts) equal to or higher than the fluid temperature (ti) to the cold heat supply unit (1),
A cooling medium circulating system using an ice-water mixed fluid provided with a flow rate adjusting means (10) for automatically adjusting the receiving flow rate of the ice-water mixed fluid. 2. The cold heat consuming section (2) receives and stores the ice-water mixed fluid supplied from the cold heat supplying section (1), and assists in taking out water to be returned to the cold heat supplying section (1) from the lower part of the tank. An ice heat storage tank (23), and a cold heat consumption executing section (7) for taking out and consuming the stored cold water of the stored ice water mixed fluid from the auxiliary ice heat storage tank (23); An ice quantity detection sensor (24) for detecting the amount of ice stored in the auxiliary ice heat storage tank (23) is used as the detection means, and the auxiliary ice heat storage tank (24) is detected based on information detected by the ice quantity detection sensor (24). 2. The structure according to claim 1, wherein the receiving flow rate of the ice-water mixed fluid into the auxiliary ice heat storage tank (23) is automatically adjusted so as to keep the amount of stored ice in the auxiliary ice heat storage tank (23) within a range of a set allowable fluctuation range. 4. A cooling medium circulation system using an ice-water mixed fluid according to item 1. 3. The flow rate adjusting means (10) includes a temperature sensor (27) for detecting a temperature (to) of water returned from the cold heat consuming section (2) to the cold heat supplying section (1) as the detecting means. , Based on the detection information of this temperature sensor (27),
The temperature (to) of the water returned from the cold heat consuming unit (2) to the cold heat supplying unit (1) is increased to the predetermined temperature (ts) set to a temperature higher than the temperature (ti) of the receiving ice-water mixed fluid. 2. The cooling / heating medium circulating equipment using an ice-water mixed fluid according to claim 1, wherein the flow rate of receiving the ice-water mixed fluid into the cold heat consuming unit (2) is automatically adjusted so as to maintain the same. 4. An ice heat storage tank (17) for storing ice produced by the ice making machines (15) and (20) together with return water from the cold heat consuming section (2).
(21). The ice storage tanks (17) and (21) are provided with valve units (19) and (22) for supplying ice taken out from the upper part of the tank and water taken out from the lower part of the tank.
The cooling / heating medium circulating equipment using the ice-water mixed fluid according to any one of claims 1 to 3, which is configured to generate an ice-water mixed fluid by merging at a predetermined ratio. 5. A pressure sensor (14) for detecting a supply pressure of the ice-water mixed fluid in a main pipe (5) for supplying the ice-water mixed fluid from the cold heat supply section (1), and detection information of the pressure sensor (14). The main pipe flow adjusting means (13) for automatically adjusting the supply amount of the ice water mixed fluid from the cold heat supply unit (1) so that the supply pressure of the ice water mixed fluid in the supply main pipe (5) becomes a predetermined value based on The cooling / heating medium circulating equipment using the ice-water mixed fluid according to any one of claims 1 to 4, which is provided with (1).