JPH06257988A - Cooling tower - Google Patents

Abstract

PURPOSE:To provide a cooling tower in which water saving is performed and an installation space is not increased. CONSTITUTION:A cooling tower 1 can cool an absorber cooling coil 31, a condenser cooling coil 32 of an absorption type cold/warm water machine 3 with coolant. The tower 1 mainly comprises a sprinkler 12, a filling layer 13, a lower water tank 14, a solenoid valve 21, an auxiliary tank 25, an auxiliary tank solenoid valve 26, and control means (27, 28). At the time of switching from cooling to heating, retained waters in the coils 31, 32 are stored in the tank 14 by opening the valves 21, 26 and feeding it through the tank 25 and the valve 26. When the tank 14 reaches a water level in which the water cannot be stored in the tank 14, the valve 26 is closed to store the coolants in the coils 31, 32 and tubes 19, 20 in the tank 25. At the time of switching heating to cooling, when a coolant level of the tank 14 is lowered from a predetermined value, the means (27, 28) open the valve 26 and return the water in the tank 25 to the tank 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling tower used in an absorption chiller-heater, and more particularly to a cooling tower which can contribute to water saving and energy saving.

[0002]

2. Description of the Related Art A cooling tower of this type is provided as a device capable of releasing the heat of condensation generated in a refrigerator during cooling to the atmosphere.

FIG. 3 is a block diagram showing such a conventional cooling tower.

The cooling tower 101 shown in FIG. 3 circulates cooling water between it and the absorption chiller-heater 103 so that the absorption heat and the condensation heat generated in the absorption chiller-heater 103 during cooling are taken away by the cooling water. This is a device for releasing the heat of the cooling water heated thereby to the atmosphere to obtain the cooling water at a low temperature again. This cooling tower 101 is
It has a rectangular shape, and the fan 111, the sprinkler 112, the packed bed 113, and the lower water tank 1 from the upper side to the lower side in the drawing.
It has a structure in which 14 are sequentially arranged. In this cooling tower 101, a sprinkler 112 is used to fill water with a packed layer 113.
And cooling the cooling water by rotating the fan 111 and storing the water in the lower water tank 114. A ball tap 115 is arranged above the lower water tank 114, and water is supplied through the ball tap 115 when the water level in the lower water tank 114 is lowered.
Although not shown, a level switch is provided above the lower water tank 114 so that the level switch can detect a decrease in the amount of water in the lower water tank 114. The lower water tank 114 is provided with an overflow 116 that can be drained when the amount of stored water exceeds the operating water level L. The bottom of the lower water tank 114 is connected to the suction side of the cooling water pump 117. The discharge side of the cooling water pump 117 is
Absorption chiller-heater 10 via check valve 118 and pipe 119
3 is connected to the inlet side of the absorber cooling coil 131. The outlet side of the absorber cooling coil 131 is connected to the water sprayer 112 of the cooling tower 101 via the condenser cooling coil 132 of the absorption chiller-heater 103 and the pipe 120. The pipe 119 on the inlet side of the absorber cooling coil 131 is connected to the upper surface of the lower water tank 114 by the drainage electromagnetic valve 121.

Further, the level switch is electrically connected to a control device (not shown), and the cooling tower 10
The water level information of 1 can be supplied to the control device. The control device is electrically connected to the cooling water pump 117 so that the cooling water pump 117 can be driven and controlled.

By the way, in the case of the absorption chiller / heater 103,
When heating, the cooling water of the absorber cooling coil 131 and the condenser cooling coil 132 is drained by opening the drainage solenoid valve 121, and when cooling is performed, the water in the lower water tank 114 is cooled by the cooling water pump 116. It is necessary to feed pressure to the water coil 131 and the condenser cooling water coil 132 so that the coils 131 and 132 are filled with water.

As described above, when the heating is performed, the cooling water of the absorber cooling coil 131 and the condenser cooling coil 132 is returned to the lower water tank 114 of the cooling tower 101 by opening the drainage electromagnetic valve 121. 1
It exceeds the operating water level L of 14 and is discharged from the overflow 116.

As shown in FIG. 4, when the model is 10 [tons of refrigeration (RT)], the amount of discharged water is equal to the amount B of water held in the lower water tank 114, the absorber cooling water coil 131, the condenser cooling water coil 132 and the like. While it is 60 [liters], the allowable retained water amount A from the operating water level L of the lower water tank 114 to the overflow water level is 20 [liters].
It becomes 40 [liter]. Similarly, the model is 20 [RT]
In this case, the drainage amount (BA) is 65 [liters] because the retained water amount B is 100 and the allowable water amount A is 20 [liters], as shown in FIG. In case of [RT], the discharge amount (BA) is 90 [liters], and in case of 40 [RT] model, the discharge amount (B-A).
A) is 60 [liters], and when the model is 50 [RT], the drainage amount (BA) is 110 [liters].

In this way, when switching from cooling to heating, the cooling water in the piping of the cooling water system is cooled by the cooling tower 10.
Since it is returned to the lower water tank 114 of No. 1,
4 exceeded the holding limit amount (A [liter]), and the excess water amount (BA) was drained from the overflow 116.

When the air conditioner is switched from the air conditioner to the air conditioner in this manner, and when the air conditioner is switched from the air conditioner to the air conditioner again within a short time, the lower water tank 114 is replaced by the amount of the discarded water (BA). The amount of water inside was insufficient, and the cooling operation could not be performed until this amount of water was supplied via the ball tap 117.

[0011]

As described above, in the cooling tower 101 used in the absorption chiller-heater in which the heating and cooling are switched in a short time, for example, twice or more times a day, the heating to cooling is performed. When switching to
There is a drawback in that the amount exceeding the holding limit water amount A of the lower water tank 114 is drained and water is wasted.

Further, in the cooling tower 101, when switching from cooling to heating, unless the amount of water drained from the lower water tank 114 is supplied from the ball tap 117, the cooling operation cannot be performed, and the rising time of the cooling operation is increased. Has the drawback of being long.

Generally, such a drawback can be solved by increasing the allowable amount of water held in the lower water tank 114 of the cooling tower 101. However, doing so is contrary to the desire to make the installation space small and increases the cost. It was difficult to realize because of the drawback of being connected.

It is an object of the present invention to solve the above-mentioned drawbacks, to provide a cooling tower which can save water and does not increase the installation space.

[0015]

In order to achieve the above object, the cooling tower of the present invention is configured such that cooling water for cooling an absorber cooling coil and a condenser cooling coil of an absorption chiller-heater is transferred from a sprinkler to a packed bed. In a cooling tower that can drop and cool, store the cooling water in the lower water tank, and supply it again to each coil of the absorption chiller-heater, an electromagnetic that can drain the water held by each coil of the absorption chiller-heater during heating Valve and an auxiliary tank that can store the drainage returned through the solenoid valve and that is provided below the coils and above the operating water level of the lower water tank, and that is provided at the bottom of the auxiliary tank. Auxiliary tank solenoid valve that can return the water held in the lower tank to the lower tank, and monitor the water level in the lower tank, and when the water level in the lower tank reaches a certain level or lower, Characterized in that a control means for opening the valve.

Further, the control means includes a level switch capable of detecting the water level of the lower water tank, and the auxiliary tank solenoid when the water level of the lower water tank reaches a certain level or lower based on a water level detection signal from the level switch. It may be composed of a controller that gives an opening control signal to the valve.

Further, it is desirable that the auxiliary tank is provided outside the radius of gyration of the sprinkler of the cooling tower.

[0018]

According to the present invention, when switching from cooling to heating, the amount of water held in the absorber cooling coil, the condenser cooling coil and the cooling water pipe of the absorption chiller-heater is opened by opening the solenoid valve, and the auxiliary tank and auxiliary tank. It is stored in the lower water tank via a solenoid valve. Then, when the water level that cannot be stored in the lower water tank is reached, the auxiliary tank electromagnetic valve is closed to store the cooling water in the coils and the piping in the auxiliary tank. This can be achieved by monitoring the water level in the lower tank with the control means and closing the auxiliary tank solenoid valve of the auxiliary tank when the overflowing water level is reached.

Further, according to the present invention, since the electromagnetic valve is closed when the heating mode is switched to the cooling mode, the cooling water in the lower water tank goes to each coil of the absorption chiller-heater. At this time, when the cooling water level of the lower water tank falls below a certain value, the control means opens the auxiliary tank electromagnetic valve to return the water held in the auxiliary tank to the lower water tank. Therefore, the amount of water in the lower water tank does not become insufficient.

[0020]

The present invention will be described below with reference to the illustrated embodiments.

FIGS. 1 and 2 show an embodiment of the cooling tower of the present invention, and FIG. 1 is a sectional view of the embodiment.
FIG. 2 is a plan view of the same embodiment.

In these figures, the cooling tower 1
Circulates cooling water between the absorption chiller-heater 3 to remove the absorption heat and the condensation heat generated in the absorption chiller-heater 3 during cooling by the cooling water, thereby cooling the heated cooling water. The heat can be released to the atmosphere to obtain low temperature cooling water again.

The cooling tower 1 has a square shape in a plane, a rectangular shape in a side surface, and a rectangular parallelepiped shape as a whole, and has a fan 11, a sprinkler 12 and
It has a structure in which a packed bed 13 and a lower water tank 14 are sequentially arranged. Further, the cooling tower 1 cools the cooling water by bringing the cooling water into the packed bed 13 by the sprinkler 12 and rotating the fan 11 to bring the cooling water into contact with the air so that the cooling water is stored in the lower water tank 14. You can do it.

A ball tap 15 is provided above the lower water tank 14.
Is provided, and water is supplied through the ball tap 15 when the water level in the lower water tank 14 drops. The lower water tank 14 is provided with an overflow 16 that can be drained when the amount of stored water exceeds the operating water level L.

The bottom portion of the lower water tank 14 is connected to the suction side of the cooling water pump 17. Cooling water pump 1
The discharge side of 7 is connected to the inlet side of the absorber cooling coil 31 of the absorption chiller-heater 3 via the check valve 18 and the pipe 19. The outlet side of the absorber cooling coil 31 is connected to the sprinkler 12 of the cooling tower 1 via the condenser cooling coil 32 of the absorption chiller-heater 3 and the pipe 20. The pipe 19 on the inlet side of the absorber cooling coil 31 is connected to the upper surface of the auxiliary tank 25 by a drainage electromagnetic valve 21.

As shown in FIG. 4, the capacity of the auxiliary tank 25 is formed so as to correspond to the overflow amount (BA [liter]) according to the cooling tower type (RT). Further, the installation height of the auxiliary tank 25 needs to be set lower than the absorber cooling coil 31 and the condenser cooling coil 32 and higher than the operating water level L of the lower water tank 114. Further, the auxiliary tank 25 needs to be installed in the surplus space of the cooling tower 1, for example, outside the outer circumference of the turning radius r of the sprinkler 12 as shown in FIG. At the bottom of the auxiliary water tank 25, an auxiliary tank electromagnetic valve 26 that can drain water is installed on the lower water tank 14.

A level switch 27 is provided above the lower water tank 14 so that a decrease in the amount of water in the lower water tank 14 can be detected by the level switch. The level switch 27 is electrically connected to the controller 28 and outputs the water level information of the cooling tower 1 to the controller 2.
8 can be supplied. The controller 28 is the cooling water pump 1
7, the drainage solenoid valve 21, and the auxiliary tank solenoid valve 26 are electrically connected to drive the cooling water pump 17 and control the opening and closing of the solenoid valves 21 and 26, respectively.

The operation of this embodiment will be described.

<Operation when switching from cooling to heating> When switching from cooling to heating, the controller 28
Opens the solenoid valves 21, 26. As a result, the water retained in the pipes 19 and 20 of the cooling tower 1 and in the absorber cooling coil 31 and the condenser cooling coil 32 is stored in the solenoid valve 21.
It returns to the auxiliary tank 25 by way of a free fall. The water in the auxiliary tank 25 also returns to the lower water tank 14 because the auxiliary tank solenoid valve 26 is open. Here, since the water level in the lower water tank 14 is detected by the level switch 27 and input to the controller 28, when the water level in the lower water tank 14 reaches the overflow water level, the controller 2
8 closes the auxiliary tank solenoid valve 26. Thereby, the pipe 1 after the auxiliary tank solenoid valve 26 is closed
The remaining retained water in 9, 20 and in the absorber cooling coil 31 and the condenser cooling coil 32 is accumulated in the auxiliary tank 25. Then, when all the water in the pipes 19 and 20 and in the absorber cooling coil 31 and the condenser cooling coil 32 is drained into the auxiliary tank 25, the controller 2
8 closes the solenoid valve 21.

<Operation when switching from heating to cooling> On the other hand, when switching from heating to cooling, the water level in the lower water tank 14 is the overflow water level as described above. When the cooling water pump 17 operates in this state,
The cooling water flows from the lower water tank 14 to the pipe 19, the absorber cooling coil 31, the condenser cooling coil 32, and the like. At that time
Since the electromagnetic valve 21 is already closed, the cooling water is not discharged to the auxiliary tank 25, but goes to the sprinkler 12 through the pipe 19, the absorber cooling coil 31, the condenser cooling coil 32, and the pipe 20. .

Then, when the water level in the lower water tank 14 is gradually lowered to reach the operation level L, the controller 28 opens the auxiliary tank solenoid valve 26 by the detection signal from the level switch 27. As a result, the water held in the auxiliary tank solenoid valve 26 returns to the lower water tank 14. As a result, the water level in the lower water tank 14 does not drop below the operating water level L and the operation of the absorption chiller-heater 3 is not stopped.

Upon completion of such a series of operations, a cooling water circuit is formed as shown by the arrow in the figure.

In this embodiment, an auxiliary tank 25 is provided in addition to the lower water tank 14 of the cooling tower 1, and the water level of the lower water tank 14 is detected by the level switch 27 and monitored by the controller 28. When it is about to occur, the solenoid valve 21 and the auxiliary tank solenoid valve 26 are controlled to be opened and closed.

[0034]

As described above, according to the present invention, when switching from cooling to heating, it is not necessary to discard the amount of water held in the absorber cooling coil, the condenser cooling coil, and the cooling water pipe by overflow. It has the effect of contributing to water saving and energy saving.

Further, according to the present invention, since the amount of water in the lower water tank of the cooling tower does not become insufficient during cooling,
The cooling start-up time can be shortened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a cooling tower of the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a cross-sectional view showing an example of a conventional cooling tower.

FIG. 4 is an explanatory diagram of a relationship between a cooling tower and an overflow amount.

[Explanation of symbols]

 1 Cooling Tower 3 Absorption Type Water Heater 11 Fan 12 Sprinkler 13 Packed Bed 14 Lower Water Tank 16 Overflow 17 Cooling Water Pump 19 Piping 20 Piping 21 Solenoid Valve 25 Auxiliary Tank 26 Auxiliary Tank Solenoid Valve 27 Level Switch 28 Controller 31 Absorber Cooling Coil 32 condenser cooling coil

Claims (3)

[Claims] 1. A cooling water for cooling an absorber cooling coil and a condenser cooling coil of an absorption chiller-heater is dropped from a sprinkler to a packed bed to be cooled, and the cooling water is stored in a lower water tank and is again absorbed. In a cooling tower that can be supplied to each coil of the chiller-heater, a solenoid valve that can drain stored water such as each coil of the absorption chiller-heater during heating, and drainage that is returned via the solenoid valve can be stored, and An auxiliary tank provided below each coil above the operating water level of the lower water tank, and an auxiliary tank solenoid valve provided at the bottom of the auxiliary tank and capable of returning the water held in the tank to the lower water tank, A cooling tower, comprising: a control unit that monitors the water level of the lower water tank and opens the auxiliary tank solenoid valve when the water level of the lower water tank reaches a certain level or lower. 2. The control means includes a level switch capable of detecting the water level of the lower water tank, and the auxiliary tank electromagnetic when the water level of the lower water tank reaches a certain level or lower based on a water level detection signal from the level switch. The cooling tower according to claim 1, further comprising a controller that gives an opening control signal to the valve. 3. The auxiliary tank is provided outside a turning radius of a sprinkler of a cooling tower.
Cooling tower shown.