JPH0828913A - Ice heat storage type refrigerating unit - Google Patents

Abstract

PURPOSE:To provide an energy saving inexpensive ice heat storage type refrigerating unit capable of securely preventing freezing in a water heat exchanger. CONSTITUTION:An ice heat storage type refrigerating unit is provided. In the unit, there are provided a brine passage in which there are connected a freezer 1, an ice heat storage tank 2, an ice heat exchanger 3, a brine pump 4, and adjusting valves 5, 13 through a piping 8 and a cold water passage in which there are connected the water heat exchanger 3, a cooling load and a cooling water pump 6 through a piping 8. Brine is cooled with the freezer 1, and water in the ice heat storage tank 2 is frozen with the brine and heat is stored. Upon heat radiation, the brine is cooled with heat of fusion of the ice in the ice heat storage tank 2, and the brine is fed to the water heat exchanger 3 to cool the cold water. Hereby, the unit takes out cooling capability. Further, a temperature sensor 9 is mounted on the water heat exchanger 3. There is provided control means 10 for operating the cooling water pump 6 when the temperature sensor reaches a predetermined temperature or lower during interruption of heat radiation while interrupting the cooling water pump 6 when it reaches the predetermined temperature or higher. The temperature sensor 12 may be provided also on the brine passage in the water heat exchanger.

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 type refrigerator unit, and more particularly to an ice heat storage type refrigerator unit provided with an antifreezing mechanism for use in air conditioning equipment of general buildings.

[0002]

2. Description of the Related Art An ice heat storage type refrigerator has been developed as an economical cooling system that uses night power, and is used as an energy-saving and space-saving building cooling system. In the conventional ice heat storage type refrigerator, no consideration was given to freezing of cold water in the water heat exchanger while heat radiation was stopped, or only the cold water pump was operated continuously. However, there is a problem that the water in the water heat exchanger freezes due to the brine flowing into the water heat exchanger during the heat storage operation during heat radiation stop, leading to damage to the water heat exchanger. It was uneconomical and economically problematic to operate the cold water pump continuously.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides an ice heat storage type refrigerator unit which can reliably prevent freezing in the water heat exchanger, save energy, and are inexpensive. This is an issue.

[0004]

In order to solve the above-mentioned problems, in the present invention, a refrigerating machine, an ice heat storage tank, a water heat exchanger, a brine route connecting a brine pump and a control valve with a pipe, and a water heat exchange. And a cooling water path in which a cooling load and a cold water pump are connected by piping, the brine is cooled by the refrigerator, and the water in the ice heat storage tank is frozen by the brine to store heat. In the ice storage type refrigerator unit that cools the brine by the heat of melting of ice in the heat storage tank, guides the brine to a water heat exchanger, and cools cold water to take out cooling capacity, a temperature sensor is provided in the water heat exchanger. A control means is provided for operating the chilled water pump when the temperature sensor is below a predetermined temperature while stopping heat radiation and stopping the chilled water pump when the temperature sensor is above a predetermined temperature. In the above, it is preferable to provide a temperature sensor also in the brine path in the water heat exchanger.

[0005]

[Function] Since the ice heat storage type refrigerator uses economical nighttime electric power, it performs heat storage operation at night and radiates the cold heat stored at night during the daytime, but heat is not released during heat storage operation. When not done, the refrigerator produces −5 ° C. brine, and this brine converts the water in the ice heat storage tank into ice to store heat. During this heat storage operation, the brine circulates by bypassing the water heat exchanger with the control valve, however, however, the low temperature brine gradually elapses due to a malfunction of the control valve, dust clogging, leakage at the time of full closure, etc. However, it may flow into the water heat exchanger, in which case the water in the water heat exchanger may freeze. Freezing can damage the water heat exchanger and cause brine to flow into the cold water system. The present invention has a temperature sensor attached to the inside or casing of the water heat exchanger, and by providing a control means for operating the chilled water pump according to the detected value of the temperature sensor,
It is possible to detect the leakage of low temperature brine from the temperature drop and operate the cold water pump to prevent freezing.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings, but the present invention is not limited thereto. Example 1 FIG. 1 is a flow configuration diagram for explaining an example of the ice heat storage type refrigerator unit of the present invention. In FIG. 1, 1 is a refrigerator, 2 is an ice heat storage tank, 3 is a water heat exchanger, 4 is a brine pump, 5 and 13 are control valves, 6 is a cold water pump, 7 is a brine pipe, and 8 is a cold water pipe. , 9, 11 and 12 are temperature sensors, and 10 is a control panel for detecting the temperatures of the temperature sensors 9, 11 and 12 and controlling the control valves 5 and 13 and the cold water pump 6, respectively.

In this ice heat storage type refrigerator, during the heat storage operation, the refrigerator 1 manufactures brine of -5 ° C., and the brine bypasses the water heat exchanger 3 by the control valve 5 and is guided to the heat storage tank 2. , Turn the water in the heat storage tank into ice. Further, during the heat radiation operation, the brine is cooled by utilizing the heat of melting of ice in the heat storage tank, and the cold water temperature 11 at the outlet of the water heat exchanger is set to a predetermined value (for example, 7
The water heat exchanger inlet temperature 12 is adjusted by adjusting the flow rate by the adjusting valve 5 so that the temperature becomes (° C.) and controlling the amount of brine flowing into the heat storage tank 2 by the adjusting valve 13. The chilled water pump 6 is a chilled water water supply pump to the load side, which is operated during heat radiation operation and stopped when heat radiation is stopped. Then, when heat radiation is stopped, when the cold water in the water heat exchanger 3 approaches the freezing point with the temperature sensor 9, the cold water pump is operated to replace the cold water in the water heat exchanger with the cold water higher than the freezing point and freeze. Prevent. Therefore, the temperature sensor 9 needs to be inside the water heat exchanger 3.

The temperature drop of the cold water in the water heat exchanger is
Since the brine leaks when the cold water pump 6 is stopped, it is desirable that the temperature sensor 9 be installed at a position where it can detect the brine leak and can detect the heat exchange with the brine when the cold water pump 6 is in operation. In the present invention, external cold water is used to heat the leaked brine above the freezing point to prevent freezing by stopping the cold water pump at a stage where there is no risk of freezing, and frequent cold water pump It prevents the stoppage. FIG. 2 shows an explanatory diagram of forced operation of the cold water pump 6. In FIG. 2, the temperature of the temperature sensor 9 is about 0 to 2 ° C.
When the temperature of the temperature sensor 9 rises to about 2 to 4 ° C., the cold water pump 6 is stopped. By controlling the operation in this manner, freezing in the water heat exchanger can be prevented with energy saving.

[0009]

As described in detail above, according to the present invention,
It is possible to provide an ice heat storage type refrigerator unit that is energy-saving and can accurately prevent freezing.

[Brief description of drawings]

FIG. 1 is a flow configuration diagram showing an example of an ice heat storage type refrigerator unit of the present invention.

FIG. 2 is an explanatory diagram of forced operation of the cold water pump according to the present invention.

[Explanation of symbols]

1: Refrigerator, 2: Ice heat storage tank, 3: Water heat exchanger, 4: Brine pump, 5: Control valve, 6: Cold water pump, 7: Brine piping, 8: Cold water piping, 9: Temperature sensor, 10: Control panel, 11: temperature sensor, 12: temperature sensor, 13:
Control valve

Claims (2)

[Claims] 1. A brine path in which a refrigerator, an ice heat storage tank, a water heat exchanger, a brine pump and a control valve are connected by piping,
A water heat exchanger, a cooling water path having a cooling load and a cold water pump connected by piping are provided, and the brine is cooled by the refrigerator, and the water in the ice storage tank is frozen by the brine to store heat.
At the time of heat radiation, the brine is cooled by the heat of melting of ice in the ice storage tank, the brine is guided to a water heat exchanger, and the water heat exchange is performed in an ice storage refrigerator unit that cools cold water to take out cooling capacity. A temperature sensor was attached to the container, and a control means was provided for operating the chilled water pump when the temperature sensor fell below a predetermined temperature while radiating heat stopped, and stopping the chilled water pump when the temperature sensor exceeded a predetermined temperature. An ice heat storage type refrigerator unit characterized in that. 2. The ice storage refrigerator unit according to claim 1, wherein a temperature sensor is provided in a brine path in the water heat exchanger.