JPH0794942B2 - Heat storage state detection device for ice heat storage equipment - Google Patents

Description

The present invention relates to an ice heat storage facility for storing a refrigerant in a solid-liquid mixed phase sherbet state in an ice heat storage tank as a cold heat source for cooling, etc. The present invention relates to a device for detecting the heat storage state of an ice heat storage tank.

[Conventional technology]

In the type of ice heat storage in which ice is grown and accumulated around the cooling coil in the heat storage tank, the heat storage state (heat storage amount, etc.) can be determined by detecting the thickness of the growing ice. In the type of ice heat storage that is stored in a mixed-phase sherbet state, it cannot be done, so conventionally, as with cold water heat storage, the heat storage state is determined based on the temperature detection of the stored refrigerant, or the volume accompanying cooling and solidification of the refrigerant The heat storage state has been determined by obtaining the abundance ratio of ice particles in the stored refrigerant based on the detection of the liquid level of the stored refrigerant using expansion (the literature cannot be shown).

[Problems to be solved by the invention]

However, since the so-called ice heat storage is originally to store heat by utilizing latent heat of solidification, it is not possible to accurately determine the heat storage state by sensible heat determination based on temperature detection, and determination based on liquid level detection. However, since the liquid level detection itself has many disturbance factors such as ripples on the liquid surface and a large detection error, there is also a problem that it is difficult to determine the heat storage state stably and accurately.

An object of the present invention is to enable a stable and appropriate determination of the heat storage state of an ice heat storage tank with a relatively simple device configuration by rational means adapted to a refrigerant in a solid-liquid mixed phase sherbet state. There is a point to.

[Means for solving problems]

The characteristic configuration of the heat storage state detection device in the ice heat storage equipment according to the present invention is characterized in that the flow passage of the stored refrigerant stored in the ice heat storage tank in the solid-liquid mixed phase sherbet state is provided with resistance means for giving resistance to the refrigerant flow, As the information for determining the heat storage state in the ice heat storage tank, the differential pressure detecting means for detecting the differential pressure between the flow passage upstream side refrigerant pressure and the flow passage downstream side refrigerant pressure generated by the interposition of the resistance means is provided. Yes, its actions and effects are as follows.

[Work]

That is, when the presence ratio of ice particles in the stored refrigerant becomes large, the differential pressure between the refrigerant pressure on the upstream side of the flow passage and the refrigerant pressure on the downstream side of the flow passage increases due to the presence of the resistance means in the flow of the refrigerant, so that the difference By observing the magnitude of the pressure, it is possible to grasp the presence state of ice in the circulating refrigerant and determine the heat storage state in the ice heat storage tank.

〔The invention's effect〕

That is, since the heat storage state is determined by the correlation with the existence rate of ice particles, the total heat state including latent heat can be determined, and
With differential pressure detection, stable detection can be carried out without being subject to various types of disturbance as much as with liquid level detection, and from these facts, the heat storage of the ice heat storage tank can be performed with good adaptation to ice heat storage in a solid-liquid mixed phase sherbet state. The state can now be determined stably and accurately.

Moreover, the combination of resistance means such as a filter or orifice and differential pressure detection means such as a differential pressure gauge is a relatively simple device configuration that is generally widely used. The heat storage state detection device was extremely useful and practical for operation control of a cooling system using heat storage.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a heat pump circuit (5) for circulating a primary refrigerant in the order of a compressor (1), a condenser (2), an expansion valve (3), and an ice maker (4) as an evaporator is provided. Provided,
The ice maker (4) and the ice heat storage tank (6) are connected by the circulation path (7) for the secondary refrigerant, so that the circulation secondary refrigerant is solid-liquid in the ice maker (4) by the operation of the heat pump circuit (5). In addition to the mixed-phase sherbet state, the secondary refrigerant in the sherbet state is stored in the ice heat storage tank (6) to perform cold heat storage for cooling or the like.

In the secondary refrigerant circulation path (7), the mesh body (8) is interposed in the outward path (7a) on the liquid phase secondary refrigerant outlet side connected to the lower portion of the ice heat storage tank (6), and the mesh body (8) ) As a resistance means to give a predetermined resistance to the flow of the secondary refrigerant, and
A differential pressure sensor (9) detects the differential pressure between the forward-path upstream-side refrigerant pressure and the forward-path downstream-side refrigerant pressure generated by the interposition of the mesh body (8).

In other words, when heat accumulation in the ice heat storage tank (6) proceeds and ice particles flow out from the outward path (7a) together with the liquid-phase secondary refrigerant, the refrigerant pressure on the upstream side and the downstream path of the outward path generated by the interposition of the mesh body (8). Utilizing the fact that the differential pressure with the side pressure refrigerant pressure becomes large,
Based on the detection result of the differential pressure, the heat storage state (heat storage amount) in the ice heat storage tank (6) is determined.

Then, as an automatic operation control configuration of the heat pump circuit (5), when the differential pressure detected by the differential pressure sensor (9) becomes larger than a set value, the controller (10) automatically stops the operation of the compressor (1). So that the ice heat storage tank (6)
The operation of the heat pump circuit (5) is automatically stopped when the cold heat storage amount reaches the upper limit.

On the other hand, the mesh body (8) also has a filter function of preventing large ice particles from entering the ice maker (4),
Thereby, the ice trouble caused by the growth of the invading ice particles in the ice maker (4) is prevented and the operation of the ice maker is stabilized.

[Another embodiment]

 Next, another embodiment of the present invention will be described.

In determining the heat storage state by detecting the differential pressure generated by the interposition of the resistance means in the flow of the stored refrigerant, as shown in FIG. 2, an ice maker (4) is provided at an appropriate location of the ice heat storage tank (6). A circulation path (11) for forcibly circulating the stored refrigerant is provided in addition to the refrigerant circulation between and, and the circulation means (11) is equipped with a resistance means (8) and a differential pressure detection means (9). Is also good.

Further, as shown in FIG. 3, a plurality of circulation paths (11) each equipped with the resistance means (8) and the differential pressure detection means (9) as described above are vertically arranged with respect to the ice heat storage tank (6). Therefore, the heat storage state of the ice heat storage tank (6) may be determined stepwise for the purpose of controlling the capacity of the heat pump circuit (5).

As the resistance means (8), a net body, a filter, or
Various types such as an orifice can be applied, and various types of conventionally known types can also be applied to the differential pressure detecting means (9).

The control performed based on the detected differential pressure is not limited to the start and stop of the compressor (1), and, for example, the control on the consumption side of the stored cold heat is performed based on the detected differential pressure. The detected differential pressure can be applied as information for various controls related to the heat storage state in (1), or the detected differential pressure may be used only for displaying the heat storage state.

The refrigerant is not limited to water and various aqueous solutions, and may be other various liquid agents.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing an embodiment of the present invention. FIGS. 2 and 3 are structural diagrams showing another embodiment of the present invention, respectively. (6) ... Ice heat storage tank, (7a) ... flow passage, (8) ... resistance means, (9) ... differential pressure detection means.

Claims (1)

[Claims] 1. An ice-land heat facility for storing a refrigerant in a solid-liquid mixed phase sherbet state in an ice heat storage tank (6), and a resistance means for giving resistance to the refrigerant flow in a flow passage (7a) of the stored refrigerant. 8) is provided, and as the information for determining the heat storage state in the ice heat storage tank (6), the pressure difference between the flow passage upstream side refrigerant pressure and the flow passage downstream side refrigerant pressure generated by the intervention of the resistance means (8). A heat storage state detection device for ice heat storage equipment provided with a differential pressure detection means (9) for detecting the temperature.