JPH07332711A - Ice thermal storage unit - Google Patents

Abstract

PURPOSE:To increase an ice charging coefficient, to enhance a heat storage density, and to improve the cooling efficiency of an ice thermal storage unit by installing the fins of a heat transfer tube in a direction having a long distance to the adjacent transfer tube. CONSTITUTION:Fins 7 disposed on a heat transfer tube 4 are disposed in a zigzag array, and hence the tube 4 can be disposed in the vicinity with respect to a height direction. However, since there is a limit in the horizontal direction of the tube 4 due to the bent part of the tube 4 which needs a predetermined curvature in its structure, the distance between the tubes 4 in the horizontal direction of the tube 4 is lengthened. Therefore, the fins 7 are provided in the horizontal direction of the tube 4. Thus, since ice is also generated on the fins 7, an invalid area which cannot be heretofore used to generate ice can be effectively utilized, and the maximum value of an ice charging coefficient can be increased. Accordingly, the heat storage density of an ice thermal storage unit can be enhanced, thereby improving the thermal efficiency of the unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage unit,
In particular, it relates to an ice heat storage unit for increasing the packing density of ice in the heat storage tank.

[0002]

2. Description of the Related Art An ice heat storage tank used in a conventional static type ice heat storage unit will be described with reference to FIG. In FIG. 3, 1 is a heat storage tank, 2 is hot water 6
Water header to be injected into the inside, 4 is a heat transfer tube for attaching ice to the surface, 3 is a brine header to inject a refrigerant into the heat transfer tube 4,
Reference numeral 6 is hot water for melting the ice in the heat transfer tube 4, and 5 is a water outlet for guiding the cooled hot water 6 to the air conditioning system.
In the conventional technique, hot water 6 of about 10 ° C. is sprayed from the water header 2 into the heat storage tank 1, the ice adhering to the surface of the heat transfer tube 4 is melted, and the hot water 6 is cooled to about 7 ° C. From 5 lead to air conditioning system and utilize it for cooling. The heat transfer tubes 4 have a folded structure as shown in FIG. 4, and are arranged in a staggered arrangement in multiple stages in the height direction in order to increase the amount of ice produced.

[0003]

In a conventional heat storage tank of an ice heat storage unit, a zigzag arrangement is provided in multiple stages in order to increase an ice packing coefficient IPF (Ice Packing Factor) that represents a ratio of ice to water in the heat storage tank. A heat transfer tube is placed in. If the adjacent heat transfer tubes come into contact with each other due to the growth of ice on the heat transfer tubes during ice making, excessive stress will be applied to the heat transfer tubes, causing damage to the heat transfer tubes.For reliability reasons, the most adjacent heat transfer tubes should not touch each other. Is set to the maximum value of IPF. This IP
In order to increase the maximum value of F, it may be arranged so that the distance from the adjacent heat transfer tube is equal. However, since the bent portion of the heat transfer tube requires a certain curvature, such an arrangement cannot be adopted and the maximum value of the IPF cannot be increased.

An object of the present invention is to provide an ice heat storage tank unit capable of increasing the maximum value of IPF even under the above-mentioned restrictions.

[0005]

In order to achieve the above object, the present invention is an ice heat storage unit comprising a heat transfer tube having fins installed in a direction in which a distance from an adjacent heat transfer tube is long.

[0006]

According to the above means, the ice is generated not only on the heat transfer tube but also on the fins installed on the heat transfer tube, and it is possible to effectively use the ineffective area where ice cannot be made, thus increasing the maximum value of IPF. Can be made.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is an illustration of a heat transfer tube used in the ice heat storage unit of the present invention, and FIG. 2 is an illustration showing an arrangement of the heat transfer tubes. In FIG. 2, 7 is a fin installed in the heat transfer tube 4. In the case of the present embodiment, the zigzag arrangement as shown in FIG. 2 allows the heat transfer tubes to be arranged close to each other in the height direction. However, the horizontal direction of the heat transfer tubes 4 is limited due to the bent portion of the heat transfer tubes 4 which requires a constant curvature in the structure. Therefore, the horizontal direction of the heat transfer tubes 4 has the largest distance between the heat transfer tubes. become longer. Therefore, this heat transfer tube 4
The fins 7 are installed in the horizontal direction. By installing the fins 7, since ice is also generated on the fins 7, it is possible to effectively use an invalid area that cannot be used for the conventional ice generation.
The maximum value of IPF can be increased. Therefore, an ice heat storage unit having a high heat storage density can be provided.

[0009]

As described above, according to the present invention, the ice generated on the fins can reduce the ineffective area which cannot be used for the conventional ice formation, so that the IPF can be increased and the heat storage density can be increased. The cooling efficiency can be improved. further,
By installing the fins, the flow paths inside the tube group are made uniform, and it can be expected that the deviation of the flow of water flowing in the tube group at the time of thawing is suppressed. Further, according to the present invention, the above effects can be obtained while the water header, the brine header and the like in the heat storage tank are still arranged.

[Brief description of drawings]

FIG. 1 is an explanatory view of a heat transfer tube used in an ice heat storage unit of the present invention.

FIG. 2 is an explanatory view showing an arrangement of heat transfer tubes of the present invention.

FIG. 3 is a perspective view of a conventional ice heat storage tank.

FIG. 4 is an explanatory view showing a conventional heat transfer tube and its arrangement.

[Explanation of symbols]

1 ... Heat storage tank, 2 ... Water header, 3 ... Brine header, 4 ...
Heat transfer tube, 5 ... water outlet, 6 ... hot water, 7 ... fin.

Claims (2)

[Claims] 1. A heat transfer tube having ice adhered thereto, a brine header for injecting a refrigerant into the heat transfer tube, a water header for injecting hot water for melting the ice, and for guiding the cooled hot water to an air conditioning system. An ice heat storage unit having a heat storage tank formed of a water outlet, characterized in that fins are installed on the heat transfer tubes. 2. The ice heat storage unit according to claim 1, wherein the fins are installed in a direction in which adjacent heat transfer tubes have a longest mutual distance.