JPH03110332A - Control structure for circulating water on secondary side for ice heat storage system - Google Patents

Abstract

PURPOSE:To enable the feed of an optimum quantity of heat in response to a load state by a method wherein the feed pipe on the upper stream side of a circulating pump is communicated to a first varying control valve through a bypass pipe, a direct line through which circulating water is returned from a second variable control valve located in the middle of a return pipe directly to an ice heat storage tank is provided. CONSTITUTION:By causing a given amount of circulating water to flow to the bypass line 9 side through operation of a first variable control valve 8 located in s feed pipe 3 in the downstream side of a circulating pump 2, a flow rate to a heat exchanger 4 can be arbitrarily reduced. Thereby, according to a fluctuation in the quantity of heat used by a load 5, a quantity of circulating water on the secondary side fed to the heat exchanger 4 can be changed. Further, through operation of a second control valve 10 located in a return pipe 6, when a fluctuation in a load is low and a demand quantity of heat is low, the flow rate of a direct line 11 is increased to return circulating water directly into an ice heat storage tank 1, and this way decreases the amount of melting ice. When a fluctuation in a load is high and a demand quantity of heat is high, the flow rate of circulating water from a return pipe 6 to a shower device 7 is increased to rapidly melt ice by means of the shower device 7, and this way enables the increase of the amount of heat fed to the load 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control structure for secondary circulating water in an ice heat storage system used as a load for an air conditioner or the like.

(Prior Art) In recent years, various ice heat storage systems have been proposed as an alternative to conventional water heat storage systems.

The ice thermal storage system aims to save energy by utilizing the thermal energy stored during the night using nighttime electricity for air conditioning during the day. Because it uses heat, it can dramatically improve the heat storage capacity per volume compared to conventional water heat storage systems that only use the moisture corrosion of water. It becomes possible to significantly reduce the size.

Current ice thermal storage systems depend on the properties of the ice produced.
It is broadly divided into the so-called solid ice method, which uses solid water, and the so-called liquid ice method, which uses fluid granular (crystalline) ice.

In the ice heat storage system, there is currently a method for extracting thermoelectric power from the heat storage tank to be sent to the load side.

The one shown in Figure 2 transfers the return water from the load side to the heat storage tank.
It is a method that melts the ice created by sprinkling water on two sides.
In the figure, 51 is a heat storage tank, 52 is a heat exchanger, 53 is a load such as an air conditioner, and 54 is a refrigerator.

Thus, the circulation pump 55 circulates the brine cooled by the refrigerator into the ice-making coil 56 in the heat storage tank 51,
The circulating water in the heat storage tank 51 is frozen.

On the other hand, the cooled circulating water in the heat storage tank 51 exchanges heat with the load 53 side in the first heat exchanger 52 by the circulation pump 57, and then is sprayed as return water from the top surface of the heat storage tank 51 by the shower device 58 as described above. It is designed to melt the ice that is generated.

Furthermore, the system shown in FIG. 3 is a system in which return water is circulated within the heat storage tank, and the return water is discharged into the heat storage tank 59 from a return pipe 60 whose tip is disposed at the bottom of the heat storage tank 59. ,
Since the returned water has a higher temperature than the cooling water and ice in the tank, it moves upward, during which heat is exchanged, and is sent out from the upper feed pipe 61.

(Problem to be solved by the invention) However, the above means has the following drawbacks.

■ Since the capacity of pumps, etc. is fixed at a fixed value, it is difficult to supply the amount of heat that corresponds to the load.

■ Load fluctuations tend to be greatly affected by time of day, season, etc.

Therefore, the solid (ice making coil) method has difficulty following the load due to the poor thermal conductivity of ice.

In addition, although the sherbet ice method follows the load well, the time lag between heat exchange and ice melting tends to cause excessive ice melting.

An object of the present invention is to provide a control structure for secondary circulating water in an ice heat storage system that can solve the conventional problems.

(Means for Solving the Problems) In order to achieve the above object, in the control structure for secondary circulating water in the ice heat storage system according to the present invention, circulating water is taken out from the ice heat storage tank via a feed pipe by a circulation pump, In the ice heat storage system in which the circulating water is returned to the water heat storage tank from a shower device provided at the tip of the water via a return pipe after exchanging heat with the load, A first variable control valve is provided in the return pipe, the feed pipe on the upstream side of the circulation pump and the first variable control valve are communicated through a bypass pipe, and a second variable control valve is provided in the middle of the return pipe, The present invention is characterized in that a direct pipe line for directly returning circulating water from the second variable control valve to the ice heat storage tank is formed separately from the return pipe line.

Further, in order to achieve the above object, the present invention provides the first
Instead of the variable control valve and bypass pipe configuration, the circulation pump may be of a variable flow rate type.

(Example) Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and the configuration of the secondary side of the ice heat storage system according to this embodiment is schematically that a feed pipe 3 is connected from an ice heat storage tank l by a circulation pump 2. The circulating water is taken out through the heat exchanger 4 and exchanged with a load 5 such as an air conditioner, and the circulating water is returned to the ice heat storage via the return pipe 6 from the shower device 7 installed at its tip. It is designed to be returned to tank 1.

Therefore, in this embodiment, a first variable control valve 8 is provided in the feed pipe 3 on the downstream side of the circulation pump 2, and the circulation pump 2 is provided with a first variable control valve 8.
The upstream feed pipe 3 and the first change control valve 8 are communicated through a bypass pipe 9.

Further, a second variable control valve lO is provided in the middle of the return pipe 6 that returns circulating water from the heat exchanger 4 to the ice heat storage tank 1. Separately from the pipe line of the pipe 6, there is a direct pipe line 11 that communicates with the inside of the water heat storage tank 1.
is provided, so that circulating water can be directly returned to the ice heat storage tank 1 without going through the shower device 7 described in +iii.

Furthermore, in this embodiment, a shower device 7 (No. 11-1) is disposed at the tip of the return pipe 6 in a part of the heat storage tank l, and from the tip of the shower device 7, a pipe line 12 is further disposed. is extended, and one wall surface 13 (first
The pipe 12 is bent and extended downward in a state close to the wall surface on the right side in the figure.
A water spray nozzle 15 whose jetting direction is set is arranged on the 4 side.

Therefore, the sherbet-like ice 16 floating on the water surface of the ice heat storage tank 1 can be concentrated and biased to the opposite side by the water jetted from the water spray nozzle 15.

In this embodiment having such a configuration, the amount of heat corresponding to the load 5 can be supplied by first controlling the amount of circulating water on the secondary side.

That is, by operating the first variable control valve 8, in addition to supplying all of the circulating water to the heat exchanger 4, a predetermined amount of the circulating water is caused to flow to the bypass pipe 9 side. Since the flow rate to the heat exchanger 4 can be reduced arbitrarily,
It becomes possible to change the amount of secondary side circulating water sent to the heat exchanger 4 according to fluctuations in the amount of heat used by the load 5.

In addition, by controlling the ratio of the flow rate of secondary circulating water in both the paths returning to the shower device 7 and the path directly returning to the ice heat storage tank 1 according to the load, a state in which excessive ice is melted can be prevented. Prevent it from happening.

That is, by operating the second control well IO, when the load fluctuation is small and the required amount of heat is small, the flow rate in the direct pipe line 11 is increased and the circulating water is returned directly into the ice heat storage tank. This reduces the amount of ice melted.

In addition, when the load fluctuation is large (and the required amount of heat is large), the flow of circulating water from the return pipe 6 to the shower device 7: 1 t is increased to remove ice by the shower device 7 and melt it rapidly. The amount of heat supplied to the load 5 can be increased.

Therefore, it is possible to perform economical operation without limiting the ice melting to the optimum level at all times.

Furthermore, by providing the water spray nozzle 15 with the above configuration, the water spouted from the nozzle 15 presses the sherbet ice in one direction as shown in the figure, so that no gaps are created between the ice cubes, resulting in a cold water short bath phenomenon. It is possible to prevent ice from melting evenly, and to extract heat in a stable manner.

In addition, as another embodiment, instead of the configuration of the first variable control valve 8 and the bypass pipe line 9, the circulation pump 2 may be of a variable flow rate type, and in this case, the same as in the above embodiment. It has the following effects.

Note that the present invention is not limited to the above embodiments,
It goes without saying that any number of modifications may be made without departing from the spirit of the invention.

(Effects of the Invention) The present invention is configured as described above, and can achieve the following effects.

(1) Since the flow rate of the secondary circulating water in the feed pipe downstream of the circulation pump can be arbitrarily controlled, the optimum amount of heat can be supplied in accordance with the load condition.

(2) It is possible to control the ratio of the flow rate of secondary circulating water between the path returning to the shower system and the path directly returning to the ice storage tank according to the load, which prevents excessive ice from melting. It is possible to prevent this and maintain the optimal amount of dissolution.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams showing conventional examples, respectively. 2... Circulation pump, 4... Heat exchanger, 6... Return pipe, 1... Ice heat storage tank, 3... Feed pipe, 5... R1 load, 7... Shower device , 8... First variable control valve, 9... Bypass pipeline, 10... Second variable control valve, 1... Direct pipeline, 15... Water nozzle, 16... Sherbet ice . ↑, Te patent applicant

Claims (2)

[Claims] (1) A circulation pump takes out circulating water from the ice storage tank via a feed pipe, exchanges heat with the load, and transfers the circulating water to the ice cubes from a shower device installed at the tip of the return pipe. In the ice heat storage system in which the ice is returned to the heat storage tank, a first variable control valve is provided in the feed pipe on the downstream side of the circulation pump, and the feed pipe on the upstream side of the circulation pump and the first variable control valve are connected to a bypass pipe. A second variable control valve is provided in the middle of the return pipe, and a direct pipe line for directly returning circulating water to the ice heat storage tank is provided from the second variable control valve, separate from the return pipe line. A control structure for secondary circulating water in an ice heat storage system characterized by the following: (2) A circulation pump takes out circulating water from the ice storage tank via a feed pipe, exchanges heat with the load, and transfers the circulating water to the ice cubes from a shower device installed at the tip of the return pipe. In the ice heat storage system in which the ice is returned to the heat storage tank, the circulation pump is of a variable flow rate type, and a second variable control valve is provided in the middle of the return pipe, and a line from the second variable control valve to the return pipe is connected to the return pipe. Separately, a secondary side circulating water control structure in an ice heat storage system, characterized in that a direct pipe line is formed for directly returning the circulating water to the ice heat storage tank.