KR101001293B1 - Energy-saving ice thermal storage system for separating cold charge and discharge pump - Google Patents

Abstract

PURPOSE: An energy-saving cold storage system with separate cold storage/cold release pumps is provided to prevent unnecessary power consumption by actuating only the cold release pump in a cold release mode. CONSTITUTION: An energy-saving cold storage system comprises a hot storage tank(110), a freezer(120), a heat exchanger(130), a closed cold storage circuit(140), a cold storage pump(150), a closed cold release circuit(160), a cold release pump(170), and a controller(180). The hot storage tank stores cold using midnight electricity. The freezer comprises a cooling tower and a cooling water pump to form a closed freezing circuit. The heat exchanger comprises a temperature sensor for measuring the temperature of cooling water and lowers the temperature of the cooling water through heat exchange with brine. The closed cold storage circuit connects the hot storage tank and the freezer. The cold storage pump is installed in the closed cold storage circuit to circulate brine. The closed cold release circuit connects the hot storage tank and the heat exchanger. The cold release pump is installed in the closed cold release circuit to circulate brine.

Description

Energy-saving ice heat storage system separating shaft and cooling pump {ENERGY-SAVING ICE THERMAL STORAGE SYSTEM FOR SEPARATING COLD CHARGE AND DISCHARGE PUMP}

The present invention relates to an energy-saving ice heat storage system in which an axial cooling pump is separated, and specifically, a cold storage closed circuit and an air cooling closed circuit are respectively formed on a cooler side and a heat exchanger side mainly on a heat storage tank, and a cooler and a heat exchanger are formed on each closed circuit. The present invention relates to an energy-saving ice heat storage system in which an axial cooling pump and an anti-cooling pump are installed according to the load capacity of the engine, and the axial cooling pump is separated from the cold storage pump.

In general, ice heat storage cooling system is a midnight electricity with a low electric charge, which operates a low temperature freezer at night to accumulate cold heat, and an air conditioner capable of cooling by using the stored heat stored in the state in which the low temperature freezer is stopped during the day. It is mainly installed and operated in large buildings.

The ice heat storage cooling system fills a capsule that easily absorbs heat inside the heat storage tank, passes a high temperature brine (Ethylene glycol) through the material to allow a first heat exchange, and stores a heat source, and then stores the stored heat source. To send the heat exchanger side of the closed circuit to the second heat exchanger with the cold water circulating water which constitutes another closed circuit, and then send the heat exchanged circulating water to a radiator such as a fan coil unit. The material inside the heat storage tank is generally used as an ice capsule (ice ball), the ice capsule is a solution of dilute water and nucleated material (room freezing material) in a spherical plastic container It consists of sealed in a capsule.

1 is a system diagram showing a general ice heat storage cooling system.

When the brine pump 20 on the first brine circulation path 10 is operated during cooling, the low temperature brine inside the heat storage tank 30 flows into the heat exchanger 70 through the first three-way valve 40.

The low temperature brine introduced into the heat exchanger 70 is introduced through the brine inlet pipe 77 to circulate the inside of the heat exchanger 70 through the cold water inlet pipe 71, the cold water discharge pipe 73, and the circulation pump 75. After the heat exchange with the cold water is changed to the state of the high temperature brine is sent out to the brine circulation path 10 again through the brine discharge pipe 79, the high temperature brine is sent through the non-operating refrigerator 50, the second Through the three-way valve 60 is introduced into the brine pump 20 is the circulation of the brine for cooling is made continuously. At this time, the refrigerator 50 is configured in a closed circuit together with the cooling tower 51 and the cooling water pump 53.

When the brine pump 20 on the brine circulation path 10 is operated during the cold storage, the high temperature brine inside the heat storage tank 30 is discharged, and the discharged high temperature brine is directed to the freezer 50 through the first three-way valve 40. Supplied. The supplied high temperature brine is changed to a low temperature state by heat exchange with the refrigerator 50, and this low temperature brine is continuously and repeatedly performed in the heat storage tank 30 through the second three-way valve 60. As a result, ice making is performed on the ice capsule in the heat storage tank 30.

However, in four distinct regions, including Korea, the cooling load required for spring (May-June) and autumn (September-October) is lowered to about 40% or less. The brine pump sums the head of the refrigerator and the head of the heat exchanger, calculates the capacity by reflecting this, and operates the 100% capacity regardless of the large or small cooling load capacity to supply a certain flow rate to the load. There was a problem that waste or loss of energy occurs. For example, if the head of the air conditioner is 10m, the head of the heat exchanger is 10m, and the flow rate is 1000lpm, the capacity is 20 kW / h, and when it is operated for 24 hours, 480 kW / h is consumed.

In addition, the conventional ice heat storage cooling system operates the oil heater at all times during the cooling of the refrigerant to prevent the oil inside the freezer from freezing because the freezer passes all the freezers during the cooling of the air. There was a problem in that unnecessary power and energy wastage or loss was generated because it prevents freezing by operating the circulation pump of the heat exchanger when a leak occurs by monitoring.

The present invention is to solve the above problems, and to form a heat-cooled closed circuit and the air-cooled closed circuit to the air conditioner side and the heat exchanger side around the heat storage tank, respectively, and to calculate the load capacity of the air conditioner and the heat exchanger in each closed circuit An energy-saving ice heat storage system is provided by separating the axial and air-cooled pumps by installing a pump and an air-cooled pump to prevent cooling of only the cold-cooled pump when the air is cooled, that is, by operating only the air-cooled pump when cooling. The purpose is to provide.

In addition, the present invention by applying an inverter to the cooling pump to adjust the flow rate of the refrigerant in accordance with the cooling load to prevent unnecessary power and energy waste or loss, to separate the axial and cooling pump to achieve the effect of improving efficiency and operating cost reduction Another purpose is to provide an energy-saving ice heat storage system.

In addition, the present invention provides an energy-saving ice heat storage system that separates the axial and air-cooling pump to prevent the brine from flowing into the freezer during cooling, thereby unnecessary operation of the oil heater of the freezer to prevent unnecessary power and energy waste or loss. There is another purpose.

In addition, when the cooling load exceeds the performance of the heat storage tank during the cooling, the present invention operates the storage cooling pump and the freezer, and by applying the cooling pump as an inverter pump to adjust the flow rate of the refrigerant according to the cooling load to effectively respond to the cooling load. It is another object to provide an energy-saving ice heat storage system that separates an axial cooling pump.

Features of the present invention for achieving the above object,

A heat storage tank for storing ice heat storage by using midnight electric power; A refrigerator having a cooling tower and a cooling water pump to configure a refrigeration closed circuit; A heat exchanger having a temperature sensor that exchanges brine and cooling water to cool the cooling water, and measures a temperature of the cooling water on a cooling water circulation circuit; A heat storage closed circuit interconnecting the heat storage tank and the refrigerator; A cold storage pump installed in the cold storage closed circuit to circulate the brine; An anti-cooling closed circuit interconnecting the heat storage tank and the heat exchanger; An anti-cooling pump installed in the anti-cooling closed circuit to circulate the brine and being an inverter pump; And turning on the accumulator pump when accumulating cold, turning off the refrigeration pump to perform the refrigeration in the heat storage tank through the accumulator closed circuit, turning off the accumulator pump when cooling, and turning on the refrigeration pump to turn on the refrigeration pump Cooling is performed by heat-exchanging the heat energy stored in the heat storage tank in the heat exchanger, and by measuring the temperature of the cooling water from the temperature sensor, when the cooling water temperature is lower than the reference temperature, only the cooling pump is operated to control the flow rate of the cooling pump. By controlling the cooling load, and measuring the temperature of the cooling water from the temperature sensor, and when the cooling water temperature is higher than the reference temperature, the flow rate of the cooling pump is controlled by operating both the cooling pump and the storage pump. It characterized in that it comprises a controller for controlling to correspond to the cooling load .

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According to the energy-saving ice heat storage system which separates the axial-cooling pump of the present invention comprised as mentioned above, a cold-cooled closed circuit and an air-cooled closed circuit are formed in a cooler side and a heat exchanger side centering on a heat storage tank, respectively, and a cooler and a heat exchanger in each closed circuit It is possible to prevent unnecessary power and energy waste or loss by installing only the cold storage pump for cooling, ie, cooling only the cold storage pump during cooling, by installing a storage cooling pump and an anti-cooling pump calculated according to the load capacity.

In addition, according to the present invention, by applying the air-cooling pump as an inverter pump to adjust the flow rate of the refrigerant in accordance with the cooling load to prevent unnecessary power and energy waste or loss, it is possible to achieve an efficiency improvement and operation cost reduction effect.

In addition, according to the present invention by blocking the brine flow into the freezer during cooling, the oil heater of the freezer is operated unnecessarily to prevent unnecessary power and energy waste or loss.

In addition, according to the present invention, when the cooling load exceeds the performance of the heat storage tank during cooling, the storage pump and the refrigerator are operated, and the flow rate of the refrigerant is effectively controlled according to the cooling load by using an inverter applied to the cooling pump. It can respond.

1 is a system diagram showing a general ice heat storage cooling system.
Figure 2 is a schematic diagram showing the configuration of the energy-saving ice heat storage system separated from the axial cooling pump according to the present invention.
3A to 3C are explanatory diagrams for explaining the operation of the energy-saving ice heat storage system in which the axial cooling pump is separated.

Hereinafter, with reference to the accompanying drawings, the configuration of the energy-saving ice heat storage system separated from the axial-cooling pump according to the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Figure 2 is a schematic diagram showing the configuration of the energy-saving ice heat storage system separated from the axial cooling pump according to the present invention.

Referring to Figure 2, the energy-saving ice heat storage system 100 is separated from the storage and cooling pump according to the present invention is the heat storage tank 110, the refrigerator 120, the heat exchanger 130, the cold storage closed circuit 140 and And a cold storage pump 150, a cold storage closed circuit 160, a cold storage pump 170, and a controller 180.

First, the heat storage tank 110 has an ice capsule provided by the brine which is provided inside the ice capsule as a conventional structure to store the ice heat storage.

In addition, the refrigerator 120 includes a cooling tower 121 and a cooling water pump 123 having a normal structure to configure the cooling closed circuit 125.

In addition, the heat exchanger 130 heats the cooling water circulated through the brine and the cooling water circulation circuit 131 in a conventional structure to cool the cooling water. Here, the cooling water circulation circuit 131 of the heat exchanger 130 is further provided with a temperature sensor 133 for measuring the temperature of the cooling water, the cooling water circulation pump 135 for circulating the cooling water is provided.

In addition, the heat storage closed circuit 140 connects the heat storage tank 110 and the freezer 120 to circulate the brine to the heat storage tank 110 and the freezer 120.

On the other hand, the cold storage pump 150 is installed in the cold storage closed circuit 140, on / off under the control of the controller 180 to be described later, the output is adjusted according to the cooling load to circulate the brine. Here, the capacity of the cold storage pump 150 is determined according to the head value of the refrigerator 120 and the brine flow rate.

In addition, the anti-cooling closed circuit 160 circulates the brine to the heat storage tank 110 and the heat exchanger 130 by interconnecting the heat storage tank 110 and the heat exchanger 130.

In addition, the anti-cooling pump 170 is installed in the air-cooled closed circuit 160 as an inverter pump and turned on / off under the control of the controller 180 to circulate the brine. Herein, the capacity of the air-cooled pump 170 is determined according to the head value of the heat exchanger 130 and the brine flow rate, and the sum of the capacity of the air-cooled pump 170 and the heat storage pump 150 corresponds to a cooling maximum peak value. It is preferable to have.

In addition, the controller 180 turns on the cold storage pump 150 at the time of cold storage, turns off the cold storage pump 170 to perform cold storage in the heat storage tank through the cold storage closed circuit 140, and turns off the cold storage pump 150 at the time of cold storage. In addition, the cooling pump 170 is turned on to heat the heat energy stored in the heat storage tank 110 through the heat-cooling closed circuit 160 in the heat exchanger 130 to perform cooling. Here, the controller 180 measures the temperature of the cooling water from the temperature sensor 133 at the time of cooling, and when only the cooling water temperature is lower than the reference temperature (for example, 7 ℃) by operating only the cooling pump 170 to cool the cooling pump By controlling the flow rate of the 170 to control the cooling load, and measures the temperature of the cooling water from the temperature sensor 133, when the cooling water temperature is higher than the reference temperature, the air-cooling pump 170 and the storage cooling pump 150 The flow rate of the anti-cooling pump 170 is controlled in a state in which all are operated to control to correspond to a cooling load.

Hereinafter, with reference to the accompanying drawings, the operation of the energy-saving ice heat storage system separating the axial cooling pump according to the present invention will be described in detail.

3A to 3C are explanatory diagrams for explaining the operation of the energy-saving ice heat storage system in which the axial cooling pump is separated.

<< cold storage >>

As shown in FIG. 3A, when the cold storage pump 150 installed in the cold storage closed circuit 140 is operated under the control of the controller 180, the high temperature brine inside the heat storage tank 110 is operating via the cold storage closed circuit 140. It is supplied to the refrigerator 120 side. The supplied high temperature brine is changed to a low temperature state by heat exchange with the refrigerator 120, and the low temperature brine is introduced into the heat storage tank 110 through the cold storage closed circuit 140 again. As described above, the brine is circulated through the continuous freezer 120 so that ice making of the ice capsule in the heat storage tank 110 is performed. At this time, since the anti-cooling pump 170 is inoperative, the brine of the heat storage tank 110 circulates only the heat storage closed circuit 140.

<< air conditioner >>

As shown in FIG. 3B, when the air-cooling pump 170 installed in the air-cooled closed circuit 160 is operated under the control of the controller 180, the low temperature brine inside the heat storage tank 110 passes through the air-cooled closed circuit 160. 130) is supplied to the side. And the supplied low temperature brine is changed to a high temperature state by heat exchange with the cooling water passing through the heat exchanger 130, the high temperature brine is introduced into the heat storage tank 110 through the cold storage closed circuit 140 again and the low temperature Is changed to brine.

On the other hand, the controller 180 measures the temperature of the cooling water from the temperature sensor 133 at the time of cooling, when the cooling water temperature is lower than the reference temperature (for example, 7 ℃) to operate only the air-cooling pump 170, but the air-cooling pump The flow rate of 170 is controlled to correspond to the cooling load.

On the contrary, the controller 180 measures the temperature of the cooling water from the temperature sensor 133 and operates both the cooling pump 170 and the storage cooling pump 150 when the cooling water temperature is higher than the reference temperature.

Then, the hot brine discharged from the heat exchanger 130 side through the cold storage closed circuit 140 is cooled in the freezer 120 and stored together with the low temperature brine stored in the heat storage tank 110. 130) to the side.

The high temperature brine discharged from the heat exchanger 130 through the anti-cooling closed circuit 160 is partially introduced into the freezer 120 through the cold storage closed circuit 140, and the other part is cooled by being introduced into the heat storage tank 110 and cooled. It is discharged to the heat exchanger 130 again through the closed circuit 160 and continuously circulated.

At this time, the controller 180 controls the flow rate of the anti-cooling pump 170 to correspond to the cooling load.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

30, 110: heat storage tank 50, 120: freezer
70, 130: heat exchanger 140: cold storage closed circuit
150: cold storage pump 160: air-cooled closed circuit
170: cooling pump 180: controller

Claims (4)

A heat storage tank for storing ice heat storage by using midnight electric power;
A refrigerator having a cooling tower and a cooling water pump to configure a refrigeration closed circuit;
A heat exchanger having a temperature sensor that exchanges brine and cooling water to cool the cooling water, and measures a temperature of the cooling water on a cooling water circulation circuit;
A heat storage closed circuit interconnecting the heat storage tank and the refrigerator;
A cold storage pump installed in the cold storage closed circuit to circulate the brine;
An anti-cooling closed circuit interconnecting the heat storage tank and the heat exchanger;
An anti-cooling pump installed in the anti-cooling closed circuit to circulate the brine, and being an inverter pump; And
When accumulating, the storage pump is turned on, the cooling pump is turned off to perform the cooling operation of the heat storage tank through the closed cooling circuit, and when cooling, the storage pump is turned off, and the cooling pump is turned on to turn on the cooling tank. By cooling the heat energy stored in the heat exchanger in the heat exchanger to perform cooling, by measuring the temperature of the cooling water from the temperature sensor, when the cooling water temperature is lower than the reference temperature only by operating the cooling pump to control the flow rate of the cooling pump Control to correspond to a cooling load, and measure the temperature of the cooling water from the temperature sensor and when the cooling water temperature is higher than the reference temperature, the cooling of the cooling pump by controlling the flow rate of the cooling pump in the state in which both the cooling pump and the storage pump It characterized in that it comprises a controller for controlling to correspond to the load ·-Cooling pump energy-saving, remove the ice storage system. delete delete delete

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