JPH05118587A - Supercooling ice making and heat accumulating device - Google Patents

Abstract

PURPOSE:To meet fine ice crystals contained in cold water surely without deteriorating the efficiency of the whole of a device with a simple constitution. CONSTITUTION:In a supercooling ice making and heat accumulating device, cold water in a heat accumulating tank 1 is circulated into a supercooler 3 to obtain supercooled condition and ice is made by releasing the supercooled condition by providing the condition with a change whereby heat is accumulated in the heat accumulating tank 1. The title device is equipped with a preheating heat exchanger 5, provided at the inlet side of cold water of the supercooler 3 and heating cold water by supplying with room cooling heat load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subcooling ice heat storage device applied to an ice heat storage device for air conditioning and an ice heat storage system for district cooling.

[0002]

2. Description of the Related Art Conventionally, in a supercooled ice making heat storage device applied to an ice heat storage device for an air conditioner or an ice heat storage system for district cooling, in the process of bringing the cold water into a supercooled state, the freezing of cold water in the subcooler In order to prevent this from occurring, the fine ice crystals contained in the cold water are melted at the inlet of the subcooler to a temperature slightly higher than 0 ° C, and external heating by frictional heat of turbulent flow is performed. Used the means.

[0003]

However, in order to heat the electric heater and to generate the frictional heat due to the turbulent flow as described above, it is needless to say that some kind of power is required and the operation efficiency of the entire apparatus is lowered. It will be.
Further, a means for supplementing fine ice crystals contained in cold water with a filter or the like without using the external heating means is also considered, but this means requires the installation of an extremely fine filter or the like in the cold water system. However, there was a problem in terms of space and cost.

The present invention has been made in view of the above circumstances, and an object thereof is to reduce fine ice crystals contained in cold water without lowering the efficiency of the apparatus and with a simple apparatus configuration. An object of the present invention is to provide a supercooled ice heat storage device that can be melted.

[0005]

That is, according to the present invention, the cold water in the heat storage tank is circulated to a supercooler to bring it into a supercooled state, and by changing this state, the supercooled state is released to make ice. Then, in the supercooled ice making heat storage device for storing heat in the heat storage tank, provided with a cold water inlet side of the supercooler, which is provided with a preheat heat exchanger for heating the cold water by supplying a cooling heat load, With a simple configuration, it is possible to effectively utilize the cooling heat load to heat the cold water on the cold water inlet side of the subcooler.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of the subcooled ice making heat storage device. Cold water is sent from a heat storage tank 1 for storing ice to a subcooler 3 via a cold water circuit 2, and the heat storage tank on the cold water circuit 2 is shown in FIG. A cold water transfer pump 4, a preheat heat exchanger 5 for melting fine ice crystals in the cold water, and a filter 6 are provided between 1 and the supercooler 3.

The subcooler 3 is, for example, a shell-and-tube type heat exchanger, which is an evaporator of the subcooling water refrigerator 7, and has a structure in which refrigerant is passed to the shell side and cold water is passed to the tube side. Cold water on the outlet side of the subcooler 3 passes through the cold water circuit 2 and is jetted from a distributor 8 arranged above the subcooler 3 through a perforated pipe or a weir. On the other hand, the cold water sent from the pipe 9 or the duct inside the subcooler 3 to the cooling heat exchanger 11 via the transfer pump 10 is the cooling water heat exchanger 11
At this time, heat is given from an external load and returns to the subcooler 3 via the distributor 8.

During ice making, cold water in the subcooler 3 is sucked by the cold water transfer pump 4, but when ice is already present in the subcooler 3 or ice is generated during the ice making process. The temperature of the suction cold water becomes 0 ° C or lower. In this temperature range, fine ice crystals are present in the cold water, and the ice crystals serve as nuclei in the supercooler 3 in the cold water circuit 2 to form ice, which is in the tube of the supercooler 3 or in the cold water. When it occurs in the circuit 2, the tube and the cold water circuit 2 become clogged, and continuous ice making becomes impossible.

Therefore, a preheat heat exchanger 5 is provided at the inlet of the subcooler 3, preferably upstream of the cold water circuit 2, and an external load is supplied to the preheat heat exchanger 5. The cold water which is heated by the supply of the external load and in which all the fine ice crystals are melted is sent to the subcooler 3 through the cold water circuit 2.
The cold water that has entered the subcooler 3 is absorbed by the boiling of the refrigerant, is discharged from the distributor 8 in the supercooled state, the supercooled state is released, and ice is made.

At the time of cooling, cold water is transferred by a transfer pump 10 through a pipe 9 inside the heat storage tank 1 and exchanges heat with an external load through a heat exchanger 11 for cooling, so that the cold water itself is heated to store heat. Return to tank 1. As the external load, the water to be cooled is supplied to each heat exchanger by a secondary pump or the like.

[0012]

As described above, according to the present invention, the cold water in the heat storage tank is circulated to the supercooler to bring it into a supercooled state, and by changing this state, the supercooled state is released to make ice. However, in the subcooling ice making heat storage device for storing heat in the heat storage tank, since it is provided on the cold water inlet side of the subcooler, and is provided with a preheat heat exchanger for heating the cold water by supplying the cooling heat load, it is simple. By effectively utilizing the cooling load while configuring it, it is possible to reliably melt the fine ice crystals contained in the cold water without reducing the efficiency of the entire device, and reduce the target cooling load itself. And
It is possible to provide a subcooling ice-making heat storage device that can reduce the original operating power for cooling.

[Brief description of drawings]

FIG. 1 is a diagram showing the overall configuration of an apparatus according to an embodiment of the present invention.

[Explanation of Codes] 1 ... Heat storage tank, 2 ... Chilled water circuit, 3 ... Supercooler, 4 ... Chilled water transfer pump, 5 ... Preheat heat exchanger, 6 ... Filter, 7 ... Supercooled water refrigerator, 8 ... Distributor , 9 ... Piping, 10 ... Transfer pump, 11 ... Heat exchanger for cooling.

Claims (1)

[Claims] 1. A supercooled ice-making machine that circulates cold water in a heat storage tank to a supercooler to bring it into a supercooled state. By changing the state, the supercooled state is released to make ice, and heat is stored in the heat storage tank. In the heat storage device, there is provided a precooling heat storage device which is provided on a cold water inlet side of the supercooler and which heats the cold water by supplying a cooling heat load.