JPH04126934A - Heating tower system - Google Patents

Abstract

PURPOSE:To obtain low temperature cooled water efficiently by communicating an ice making machine with a brine collection tank continuously by way of piping and connecting a heat exchanger for a cooled water take out pipeline with said brine collection tank continuously by way of piping. CONSTITUTION:An ice making machine 24 is communicated with a brine collection tank 18 by way of a third pipeline 23 provided with a brine circulation pump 22 and a fourth pipeline 24. A heat exchange 26 is installed to a cold water supply pipeline 6 while a heat exchanger 26 is connected with the brine collection tank 18 by way of a return pipeline 27. The heat exchanger 26 is communicated with a spot on the way to a brine supply pipeline 21 a low passage change over valve 28 and a branch line 29. When cooled water is supplied, the brine is adapted to circulate in the line from the brine collection tank 18 through the ice making machine 25, and freezes a part of the water in the brine. The water is stored in the brine collection tank 18 where low temperature brine is supplied to the heat exchanger 26 and cooled by a refrigerating machine 2. It is, therefore, possible to further cool the cooled water and pick up lower temperature cooled water from the brine.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is useful for supplying cold water or hot water from a common heat source to the heat sources for air conditioning of multiple buildings, In order to configure a heat source for air conditioning, an air heat exchanger and a refrigerator are connected via piping,
Connect the cold water outlet pipe and hot water outlet pipes to the refrigerator in the first place.
A second switching mechanism is provided which selectively communicates through the switching mechanism and switches between a water supply state in which the pipe is filled with water and a drainage state in which the water in the pipe is discharged. The present invention relates to a heating tower system including a third switching mechanism that switches between a brine supply state in which brine in a tank is filled into a pipe and a brine discharge state in which brine is returned from the pipe to a brine recovery tank.

<Prior Art> Conventionally, a heating tower system has been generally configured as follows.

As shown in the schematic system configuration diagram shown in FIG. They are connected via a second pipe 5 for lifting.

A cold water take-out pipe 6 and a hot water take-out pipe 7 are connected to the refrigerator 2, and the cold water or hot water can be circulated and supplied to a heat source (not shown) for cooling or heating a plurality of buildings, or a large building. If so, the heat exchanger is circulated and supplied to each floor, a predetermined floor, or each room.

A second pump 8 and a first opening/closing valve ↑9 are interposed in the cold water take-out pipe 6, while a third pump ↑9 is installed in the hot water take-out pipe 7.
pump] 0 and a second on-off valve 11 are interposed.

The first on-off valve 9 and the second on-off valve 11 constitute a first switching mechanism 12 that selectively connects the cold water outlet pipe 6 and the hot water outlet @7 to the refrigerator 2.

A water supply pipe 14 is connected to the second pipe 5 through a third on-off valve 13, and a drain pipe 16 is connected to the lower part of the second pipe 5 through a switching valve 15. By controlling the opening/closing operation of the third on-off valve 13 and the switching operation of the switching valve 15, the water supply state in which the first and second piping 4.5 are filled with water and the first and second piping 4.5 are controlled. 5
A second switching mechanism is configured to switch to a drainage state in which water is discharged.

A brine recovery tank 18 is connected to the switching valve 15 via a brine recovery pipe 17, and the brine recovery tank 18 and the air heat exchanger l are connected to a fourth pump 19.
and a check valve 20 are connected to each other via a brine supply pipe 21.

The configuration of the control boat of the switching valve 15 is as shown in the schematic diagram in FIG. By controlling the switching operation of the switching valve 15 and the driving/stopping operation of the fourth pump 19, the brine in the brine recovery tank 18 can be switched to the state where it is not connected to the first and second pumps. Brine supply state filling the pipes 4 and 5 and the first and second pipes 4.5
A third switching mechanism is configured to switch to a brine discharge state in which brine is returned to the brine recovery tank 18 from inside.

The above configuration allows the following cold water supply state and hot water supply state to be obtained in a contradictory manner.

A. Cold water supply condition The first and second pipes 4 and 5 are filled with water, the first on-off valve 9 is opened, and the second and third on-off valves 11 and 13 are closed. cooling water cooled by heat radiation in the air heat exchanger 1. is used to cool the water in the cold water take-out pipe 6 and take out the cold water.

a. Switching from cold water supply state to hot water supply state After stopping the driving of the first and second pumps 3.8, switch the switching valve 15 and drain the water in the first and second pipes 4 and 5. tube 1
After draining the water, the fourth pump 19 is driven to supply the brine in the brine recovery tank 18 to the air heat exchanger ■, filling the first and second piping 4.5 with brine. Then, when the switching valve 15 is closed, the driving of the fourth pump 19 is stopped.

B. Hot water supply state After the above switching operation is completed, the first on-off valve 9 is closed, the second on-off valve 11 is opened, the first and third pumps 3.10 are driven, and the air is turned off. Using the brine heated to a high temperature due to heat absorption in the heat exchanger 1, water in the hot water take-out pipe 7 is heated and hot water is taken out.

b. ``Switching from the hot water supply state to the cold water supply state After stopping the driving of the first and third pumps 3 and 10, the switching valve 1
5, the brine in the first and second pipes 4.5 is collected into the brine collection tank 18 through the drain pipe 16, and after the collection, the third on-off valve 13 is opened and water is discharged into the second pipe 5. is supplied, the first and second pipes 4.5 are filled with water, the switching valve 15 is closed, and the third on-off valve 13 is closed.

<Problems to be Solved by the Invention> However, in the conventional example described above, in the cold water supply state, the temperature of the water returned to the refrigerator 2 is approximately 14°C, whereas the temperature of the cold water obtained in the refrigerator 2 is approximately 14°C. For example, the temperature is about 9°C, and in order to be able to cope with the maximum cooling load, such as in the middle of summer, by supplying cold water at such a temperature, it is necessary to use a second pump 8. In addition to having to be equipped with a high-capacity device, the conveyance capacity per unit time must be increased, which has the drawback of increasing initial cost and running cost, making it uneconomical.

The present invention has been made in view of these circumstances, and the invention according to claim (1) makes it possible to efficiently obtain low-temperature cold water by adding a simple configuration, and the same The purpose of the invention according to claim (2) is to reduce the amount of cold water conveyed by obtaining cold energy of The purpose is to keep the temperature constant.

<Means for Solving the Problem> In order to achieve the above-mentioned object, the present invention, as the invention according to claim (1), provides a heating tower system as described at the beginning, in which a brine recovery tank is , an ice maker is connected in communication via piping for brine circulation, and
A heat exchanger is interposed in the cold water extraction pipe, and the heat exchanger and the brine recovery tank are connected to each other via heat exchange piping.

Further, as the invention according to claim (2), a temperature sensor is attached to the cold water take-off pipe of the invention according to claim (1), which detects the temperature of the cold water cooled by the heat exchanger,
A control device that includes a flow rate adjustment mechanism that adjusts the amount of brine supplied from the brine recovery tank to the heat exchanger, and that automatically operates the flow rate adjustment mechanism so that the temperature sensed by the temperature sensor is maintained within a set range. and configure it.

<Function> According to the configuration of the heating tower system of the invention according to claim (1), attention is paid to the fact that brine becomes unnecessary and is collected in the brine recovery tank during the cold water supply state in summer, and By circulating and flowing the brine in the brine recovery tank across the ice maker, the water in the brine is frozen, and the brine recovery tank is used as an ice heat storage tank, and the resulting low-temperature brine is directly transferred to the heat exchanger. Alternatively, the cold water obtained by the refrigerator can be further cooled by supplying the cold water indirectly, and the cold water at a lower temperature can be taken out.

According to the configuration of the heating tower system of the invention according to claim (2), based on the temperature of the cold water cooled by the heat exchanger and finally taken out, when the temperature is higher than the set range, the heating tower system is heated. Increase the amount of brine supplied to the exchanger, and conversely, when the chilled water temperature is lower than the set range, reduce the amount of brine supplied to the heat exchanger to maintain the temperature of the cold water taken out within the set range. can.

<Example> Next, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic system configuration diagram showing a first embodiment of a heating tower system according to the present invention.

In this embodiment, there are a configuration in which water is circulated between the air heat exchanger 1 and the refrigerator 2 to take out cold water, a configuration in which brine is circulated instead of water to take out hot water, and a configuration in which brine is circulated between the air heat exchanger 1 and the refrigerator 2 to take out hot water. The configuration for recovering brine into the brine recovery tank 18 is the same as in the conventional example described above, and the explanation thereof will be omitted by assigning the same number, and the newly added configuration will be explained.

An ice maker 25 is connected to the brine recovery tank 18 via a third pipe 23 and a fourth pipe 24, which are equipped with a fifth pump 22 and constitute a brine circulation pipe.

A heat exchanger 26 is interposed in the cold water take-off pipe 6, and the heat exchanger 26 and the brine recovery tank 18 are connected to each other via a return pipe 27, and the heat exchanger 2G and the middle part of the brine supply pipe 21 are connected to each other. However, the flow path switching valve 28 and the branch pipe 2
They are connected via 9.

With the following configuration, when the cold water is supplied as described above,
Brine is circulated and flowed between the brine recovery tank 18 and the ice maker 25 to freeze some of the water in the brine, and the ice is stored in the brine recovery tank 18, and the resulting low-temperature brine is transferred to the heat exchanger 26. The cold water that is supplied, cooled by the refrigerator 2, and taken out can be further cooled and taken out as cold water at a lower temperature.

The ice maker 25 is operated by late-night electricity, and during the night, brine is collected (ice is stored in n18, and the ice maker 25 is operated only when ice is insufficient during daytime operation). This has the advantage of significantly reducing costs.

In the above embodiment, a part of the brine supply pipe 21 that supplies brine to the air heat exchanger 1, the fourth pump 19, the branch pipe 28, and the return pipe 27 are used to supply the brine recovery tank 18.
The brine supply pipe 21 constitutes a heat exchange pipe that directly circulates brine between the brine supply pipe 21 and the heat exchanger 26.
The heat exchange piping may be configured using a dedicated supply pipe without using a part of the fourth pump 19, or the brine recovery tank 18 and the heat exchanger 26 may be used as the heat exchange piping. It may also be configured so that they are connected via water piping.

FIG. 2 is a schematic system configuration diagram of the main parts showing the second embodiment. A temperature sensor 30 for sensing the temperature of cold water is provided.

-, between the brine recovery tank 18 and the heat exchanger 29,
A variable discharge capacity pump 31 is interposed as a flow rate adjustment mechanism, so that the amount of brine supplied from the brine recovery tank 18 to the heat exchanger 29 can be adjusted.

A control device 32 is connected to the temperature sensor 30, and a driver 33 for changing the discharge capacity of the pump 31 is connected to the control device 32.

The control device 32 is configured to compare the temperature sensed by the temperature sensor 30 with an upper limit set temperature and a lower limit set temperature, respectively, and maintain the temperature sensed by the temperature sensor 30 within a set range based on the comparison results. Comparing means is provided for outputting a command signal to the driver 33 so that the control device 32 operates as shown in FIG.

First, please input the temperature t detected by the temperature sensor 30.]
), then it is determined whether the temperature is higher than the upper limit set temperature Tu (S2).

When the temperature t is higher than the upper limit set temperature Tu, the process moves to step S3, where a command signal is output to the driver 33, the discharge amount is increased by the set amount, and the amount of brine supplied to the heat exchanger 26 is increased. To increase the degree of cooling so that the temperature of the cold water taken out is low.

On the other hand, in step S2, the temperature t is the upper limit set temperature T
If the temperature is lower than u, the process moves to step S4, and it is determined whether the temperature is also lower than the lower limit set temperature Td.

When the temperature is lower than the lower limit set temperature Td, the process moves to step S5, and a command signal is output to the driver 33,
The discharge amount is reduced by a set amount, the amount of brine supplied to the heat exchanger 26 is reduced, and the degree of cooling thereof is lowered so that the temperature of the cold water taken out becomes higher.

With the above configuration, the temperature of the cold water taken out is automatically maintained within a set range (for example, 5.5 to 6.5° C.).

The flow rate adjustment mechanism for adjusting the amount of brine supplied from the brine recovery tank 18 to the heat exchanger 29 in the second embodiment described above uses a pump with a constant discharge capacity to adjust its start/stop time. Various configurations can be adopted, such as using a flow rate control valve or providing a flow rate control valve.

<Effects of the Invention> According to the heating tower system of the invention as claimed in claim (1), an ice maker is provided, a heat exchanger is provided in the cold water take-off pipe, and the brine recovery tank, the ice maker, and the heat exchanger are provided. Although it is a simple addition of a simple configuration in which brine is circulated through each, the temperature of the cold water taken out can be lowered, and if the same amount of cold energy as before is obtained, the amount of cold water transported can be reduced, For example, by using a small-diameter cold water supply pipe, by using a low-capacity pump for conveying cold water, or by reducing the amount of conveyance per unit time, that is, the power consumption associated with driving the pump. Initial costs and running costs can be reduced, making it possible to improve economic efficiency.

Further, according to the heating hoe system of the invention according to claim (2), the amount of brine supplied from the brine recovery tank to the heat exchanger is adjusted to maintain the temperature of the cold water taken out within a set range. Therefore, the temperature of the cold water taken out can be kept constant regardless of load fluctuations in the refrigerator, and when the cold water is used as a heat source for air conditioning, for example, the temperature of the cold water obtained by the heat source can be kept constant. It is extremely useful in practice, as the amount of heat is stabilized and the cooling temperature can be well controlled.

[Brief explanation of drawings]

1 to 3 show embodiments of the heating tower system according to the present invention, FIG. 1 is a schematic system configuration diagram showing the first embodiment, and FIG. 2 shows the second embodiment. FIG. 3, which is a schematic system configuration diagram of main parts, is a flowchart explaining the operation of the control device. FIG. 4 is a schematic system configuration diagram of a conventional heating tower system, and FIG. 5 is a schematic diagram showing the configuration of a control boat of a switching valve. 1... Air heat exchanger 2... Refrigerator 6... Cold water take-out pipe 7... Hot water take-out pipe 18... Brine recovery tank 25... Ice maker 26... Heat exchanger 30.・Temperature sensor 31 ・Variable discharge capacity pump 32 ・Control device

Claims (1)

[Claims] (1) An air heat exchanger and a refrigerator are connected to each other via piping, and a cold water extraction pipe and a hot water extraction pipe are selectively connected to the refrigerator via a first switching mechanism, and a second switching mechanism is provided for switching between a water supply state in which the pipe is filled with water and a drainage state in which water in the pipe is discharged, and a brine supply state in which the pipe is filled with brine from a brine collection tank. and a third switching mechanism for switching to a brine discharge state in which brine is returned from inside the piping to the brine recovery tank. a heat exchanger is interposed in the cold water take-off pipe, and the heat exchanger and the brine recovery tank are connected in communication via heat exchange piping. ting tower system. (2) The cold water take-off pipe according to claim (1) is provided with a temperature sensor that detects the temperature of the cold water cooled by the heat exchanger, and the amount of brine to be supplied from the brine recovery tank to the heat exchanger. 1. A heating tower system comprising: a flow rate adjustment mechanism for adjusting the temperature; and a control device for automatically operating the flow rate adjustment mechanism so that the temperature sensed by the temperature sensor is maintained within a set range.