KR20210115412A - Bidirectional stratified thermal storage system - Google Patents

Abstract

The present invention provides a bi-directional thermal storage system, comprising: a heat network including at least one consumer capable of heat production and heat consumption and a heat network pump for heat circulation; a quarterly heat storage tank supplied with a heat collected by a collector; a late-night heat storage tank receiving the heat returned from the heat network; a heat pump for increasing a temperature of the heat supplied to the late-night heat storage tank; and a control device for controlling a heat flow between a quarterly heat storage system and the heat network by controlling the heat pump and the heat network pump based on the heat produced or consumed by a consumer and the heat generated through the collector. An object of the present invention is to provide the bi-directional thermal storage system which enables efficient management between the quarterly heat storage system and a heat network system.

Description

Bidirectional Quarterly Thermal Storage System {BIDIRECTIONAL STRATIFIED THERMAL STORAGE SYSTEM}

The present invention relates to a bidirectional quarterly heat storage system, and more particularly, to a bidirectional quarterly heat storage system that controls the heat flow in a heat network by predicting the amount of heat produced through the quarterly heat storage system and the heat consumption consumed by the load. .

A heat energy network is a system in which a heat source and a consumer are connected to a pipe that transports a heating medium to supply heat energy, and the existing district heating method is a type of heat energy network system.

The conventional heat energy network system was a heat supply method of a limited range, in which a business operator unilaterally supplies heat energy to a consumer. Recently, in addition to this unidirectional heat energy network method, a heat transaction-based heat energy network system that not only supplies heat energy to the consumer but also utilizes the heat energy from the consumer when surplus heat is generated on the consumer side is emerging.

On the other hand, the conventional thermal energy system has a problem in that it is difficult to efficiently control the heat flow because it is a system that does not consider the heat load (demand) and the heat production (supply).

An object of the present invention is to provide a bi-directional thermal storage system that enables efficient management between a quarterly heat storage system and a heat network system by predicting heat load (demand) and heat production (supply).

The present invention relates to a heat network comprising at least one consumer capable of heat production and heat consumption and a heat network pump for heat circulation; a quarterly heat storage tank supplied with heat collected by a collector; a late-night heat storage tank receiving heat returned from the heat network; a heat pump for increasing the temperature of the heat supplied to the late-night heat storage tank; and a control device for controlling the heat flow between the quarterly heat storage system and the heat network by controlling the heat pump and the heat network pump based on the heat produced or consumed by the consumer and the heat generated through the collector. A heat storage system is provided.

According to one embodiment, the control device analyzes the heat produced or consumed by the consumer for a preset period before control, and the amount of heat generated through the collector for a preset period after control and the heat load of the heat network By predicting and comparing, it is characterized in that the on-off of the heat pump is controlled.

According to an embodiment, when the predicted heat load is greater than the predicted amount of generated heat according to the comparison result, the generated heat is directly supplied to the heat network, and the heat stored by the late-night heat storage tank is supplied to the heat network. do it with

According to an embodiment, when the predicted heat load is greater than the heat stored in the late-night heat storage tank, the control device turns on a heat pump to store heat in the late-night heat storage tank.

According to an embodiment, the control device calculates an operation request time based on the predicted heat load and the heat pump capacity, and turns on the heat pump for the operation request time during the late night time.

According to an embodiment, the control device sets the operation time of the heat pump so as not to overlap with the expected maximum load time.

According to an embodiment, the control device sets the operation time of the heat pump based on the real-time electricity rate collected in advance.

According to an embodiment, the control device predicts a first thermal load for 24 hours and a second thermal load for every hour unit, and when it is predicted that both the first thermal load and the second thermal load will be lowered below a preset standard , characterized in that the power of the heat network pump is turned off or controlled to the lowest flow rate.

According to one embodiment, the preset period is characterized in that 24 hours.

According to an embodiment, the control device predicts the amount of heat generated through the collector for a preset period with reference to weather data.

According to an embodiment disclosed in the present invention, it is possible to efficiently operate between the quarterly heat storage system and the heat network system by predicting the heat load (demand) and heat production (supply).

According to an embodiment disclosed in the present invention, it is possible to accurately predict the amount of heat production using weather data and building data.

According to an embodiment disclosed in the present invention, the heat pump for the amount of heat production that is insufficient than the heat load can be efficiently operated with reference to the estimated maximum load time and/or real-time electricity rate.

1 is a schematic circuit configuration diagram of a bidirectional thermal storage system according to an embodiment of the present invention.
2 is a block diagram showing the configuration of a control device according to an embodiment of the present invention.
3 is a view for explaining a first operation strategy of the control device according to an embodiment of the present invention.
4 is a view for explaining a second operation strategy of the control device according to an embodiment of the present invention.
5 is a view for explaining a third operating strategy of the control device according to an embodiment of the present invention.
6 is a view for explaining a fourth operation strategy of the control device according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

Terms such as first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

1 is a schematic circuit configuration diagram of a bidirectional thermal storage system according to an embodiment of the present invention.

The bidirectional quarterly heat storage system according to an embodiment of the present invention includes a quarterly heat storage system, a heat network system, and a control device 300 for controlling the quarterly heat storage system 100 and the heat network system 200 .

The quarterly heat storage system 100 may include a solar heat collector 110 , a quarterly heat storage tank 120 , a late-night heat storage tank 130 , and a heat pump 140 .

Each component of the quarterly heat storage system 100 is connected by a pipe. For example, the solar heat collector 110 and the quarterly heat storage tank 120 are connected through a first supply pipe and a first recovery pipe. It is connected through a second supply pipe and a second recovery pipe connected to the quarterly heat storage tank 120 and the heat network system 200 .

The solar collector 110 and the thermal network system 200 are connected through a third supply pipe branched from the first supply pipe of the solar heat collector 110 and the quarterly heat storage tank and connected to the second supply pipe.

The quarterly heat storage tank 120 and the heat pump 140 are connected through a fourth supply pipe and a fourth recovery pipe.

The late-night heat storage tank 130 and the heat pump 140 are connected through a fifth supply pipe and a fifth recovery pipe.

The late-night heat storage tank 130 and the heat network system 200 are connected to a sixth supply pipe branched from the second supply pipe and a sixth recovery pipe branched from the second recovery pipe.

The solar heat collector 100 may include a solar heat exchanger. The solar heat collector 10 heats a refrigerant with solar heat and produces hot water by the solar heat exchanger.

The quarterly heat storage tank 120 supplies low-temperature water to the solar heat exchanger of the solar heat collector 100 and stores hot water discharged through heat exchange by the solar heat exchanger. In this case, the district heating recovery pipe (RL) of the heat network system may be connected to the quarterly heat storage tank 120 to store the district heating recovery water and supply it to a solar heat exchanger for heat exchange.

The late-night heat storage tank 130 is connected to the district heating supply pipe (SL) and the district heating recovery pipe (RL) to store district heating water.

The quarterly heat storage tank 120 and the late-night heat storage tank 130 may further include an input flow meter on the inlet side flowing in from the pipe, an output flow meter on the outlet side output through the pipe, a temperature measuring sensor of the heat storage water, a water level measuring sensor in the heat storage tank, etc. have.

The heat pump 140 is a steam heat pump capable of producing hot water at a high temperature, and heats the hot water supplied from the quarterly heat storage tank 120 or the late-night heat storage tank 130 and supplies it to the quarterly heat storage tank 120 or the late-night heat storage tank 130 .

The heat network system 200 includes at least one consumer 210 capable of heat production and heat consumption and a heat network pump 220 for heat circulation. In addition, the heat network system 200 may include a heat supply facility and a heat exchanger, which are main heat source facilities for supplying heat to each of the consumers 210 . Each component of the heat network system 200 is connected by piping.

The heat network system 200 may acquire the amount of power of a plurality of consumers 210 and supply heat of consumers who use relatively little power to consumers who use a little more power.

The control device 300 is installed between the quarterly heat storage system 100 and the heat network system 200 .

The control device 300 predicts the amount of production and load of the heat load, and controls the flow of heat between the quarterly heat storage system 100 and the heat network system 200 based on the predicted heat production and heat load.

The control device 300 may predict heat production, load, and the like, based on weather data and building data.

The control device 300 may predict the amount of heat load by analyzing the amount of power used or the charge for each time period used in the heat network system.

2 is a block diagram showing the configuration of a control device according to an embodiment of the present invention.

Referring to FIG. 2 , the control device 300 may include a data collection unit 310 , a heat load prediction unit 320 , an operation strategy unit 330 , and a driving control unit 340 .

The data collection unit 310 collects data including weather data, building data, power load, and the like.

The data collection unit 310 may receive the meteorological data, building data, and power load directly from a manager, or may receive a measurement value from a sensing device such as an indoor thermometer or a hygrometer, or may receive the measured value from an external device or a server. Data may be periodically reported.

Also, the data collection unit 310 may collect values of flow meters or sensors provided in the quarterly heat storage tank 120 and the late-night heat storage tank 130 .

The heat load prediction unit 320 uses an artificial intelligence big data prediction technique, etc. based on the data including the weather data, building data, power load, etc. collected from the data collection unit 310 to determine electricity rates and other energy rates (gas etc) are predicted.

The heat load prediction unit 320 may calculate the amount of heat stored in the heat storage tank on the basis of data obtained from flow meters and sensors included in the heat storage tank.

The heat load prediction unit 320 may predict the electricity rate and other energy charges based on the data of the previous day. For example, the heat load prediction unit 320 may calculate the total power production of the solar panel, the heat production of the solar collector, and the heat load of the building for the next day based on the weather data of the day and the load predicted on the day or the previous day. It is possible to predict the power production of solar panels, the heat production of solar collectors, and the heat load of buildings.

Operation strategy unit 330 according to a policy set in advance based on the data predicted by the heat load prediction unit 320 on the basis of power production, heat production, heat load heat flow between the quarterly heat storage tank, the late night heat storage tank, the heat pump, the heat network pump. Establish an operating strategy.

The operation strategy unit 330 analyzes the heat produced or consumed by the consumer for a preset period before control, and predicts and compares the amount of heat generated through the collector for a preset period after control and the heat load of the heat network. , determines the on/off of the heat pump.

When the predicted heat load is greater than the predicted amount of generated heat according to the comparison result, the operation strategy unit 330 directly supplies the generated heat to the heat network and supplies the heat stored by the late-night heat storage tank to the heat network. set up

When it is determined that the heat pump is turned on, the operation strategy unit 330 establishes a detailed operation strategy of the heat pump.

If the predicted heat load is less than or equal to the capacity of the heat storage tank at night, the heat pump is operated only for the operating time according to the predicted heat load.

First, based on the heat load predicted the next day, the operation required time of the heat pump to be discharged to the heat storage tank at night is calculated according to Equation 1.

[Equation 1]

When the operation required time of the heat pump is determined, the operation strategy unit 330 determines the operation time with reference to the light load time or real-time electricity rate for KEPCO's electricity.

The operation strategy unit 330 refers to real-time electricity rates such as load by time, advanced metering infrastructure (AMI), and billing system for each time for operation strategy.

For example, when the operation strategy unit 330 determines the operation time with reference to the KEPCO light load time, the operation time is planned to operate the heat pump during the intermediate load time excluding the maximum load time.

In another example, when the operation strategy unit 330 determines the operation time with reference to the real-time electricity rate, the heat pump is operated at a predetermined amount or less based on the real-time electricity rate.

Alternatively, based on the predicted real-time electricity price, the heat pump is selectively operated from the time of showing the lowest price according to the predicted heat load. In this case, 24-hour electricity rate prediction data is required.

The drive control unit 340 controls the operation of the quarterly heat storage tank, the late night heat storage tank, the heat pump, and the heat network pump according to the operation strategy of the operation strategy section 330 .

For example, the drive control unit 340 controls the operation of the pump disposed between the solenoid valve installed and opened at the connection point of the pipe connecting the quarterly heat storage tank, the late night heat storage tank, and the heat pumps and the pipe.

3 to 6 are diagrams for explaining an operation strategy of a control device according to an embodiment of the present invention. The heating medium may be hot water and cold water. 3 to 6 , a pipe through which hot water flows is indicated by a thick line, a pipe through which cold water flows is indicated by a thin line, and other pipes are indicated by a dotted line.

3 is a flowchart corresponding to an operation strategy when the predicted heat load is greater than the amount of heat stored in the quarterly heat storage tank 110 and the heat produced by the collector 110 is greater than the predicted heat load, according to an embodiment of the present invention. am.

The control device 300 includes a valve of a supply pipe from the solar collector 110 to the heat network 200 , a valve of a return pipe connected from the heat network 200 to the quarterly heat storage tank 120 , a quarterly heat storage tank 120 , and a solar heat collector 110 . ), open the valves of the return pipe, and close the other valves.

As shown in FIG. 3 , the heat produced through the solar heat collector is directly supplied to the heat network 200 without passing through the quarterly heat storage tank 120 . The heat pump is off.

4 is a flowchart corresponding to an operation strategy when the predicted heat load is greater than the amount of heat stored in the quarterly heat storage tank 110 and the heat produced by the collector 110 is smaller than the predicted heat load, according to an embodiment of the present invention. am.

The control device 300 includes a valve of a supply pipe from the collector 110 to the heat network 200 , a valve of a return pipe connected from the heat network 200 to a quarterly heat storage tank 120 , a quarterly heat storage tank 120 and a solar heat collector 110 . Open the valve of the return pipe connected to In addition, in order to supply insufficient heat even with the heat supplied by the collector 110 , the heat pump 140 is turned on and the valve of the supply pipe connected to the heat pump 140 and the late-night heat storage tank 130 and the heat with the late-night heat storage tank 130 . Control to open the valve of the supply pipe connected between the networks (200). The corresponding return pipe valve is also controlled to open, and the other valves are closed.

As shown in FIG. 4 , the heat produced through the solar heat collector is directly supplied to the heat network 200 without passing through the quarterly heat storage tank 120 . The heat pump 140 is turned on, and the heat supplied by the heat pump 140 is supplied to the heat network 200 through the late-night heat storage tank 130 .

5 is a flowchart corresponding to an operation strategy when the predicted heat load is greater than the amount of heat stored in the quarterly heat storage tank 110 and the heat produced by the collector 110 is smaller than the predicted heat load, according to an embodiment of the present invention. am.

More specifically, it is a strategy to operate the required operation time of the heat pump to be stored in the late-night heat storage tank based on the heat load predicted the next day during the light load time of KEPCO.

The control device 300 turns on the heat pump only during the operating time according to the predicted heat load when the predicted heat load during the KEPCO light load time (eg, early morning) is less than or equal to the capacity of the late-night heat storage tank.

The control device 300 controls to open the valve of the supply pipe connected between the late-night heat storage tank 130 and the heat network 200 and open the valve of the return pipe connected between the late night heat storage tank 130 and the heat network 200 .

6 is a flowchart corresponding to an operation strategy of a heat network when the load of the heat network is lower than a preset reference, according to an embodiment of the present invention.

The control device 300 predicts the first thermal load for 24 hours and the second thermal load for each hour unit, and when it is predicted that both the first thermal load and the second thermal load for each time unit will be lowered below a preset standard, the heat Turn off the power to the network pump or control it to the lowest flow rate.

In this case, all of the piping valves of the quarterly heat storage system 100 may be closed.

Since the embodiment shown in FIGS. 3 to 6 is only one embodiment of the present invention, the scope of the present invention should not be limited to the embodiment shown in FIGS. 3 to 6 .

The above description is merely illustrative of the technical idea of the present invention, and a person of ordinary skill in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: Quarterly heat storage system
110: solar collector
120: quarterly heat storage tank
130: late night heat storage tank
140: heat pump
200: heat network system
300: control device

Claims (10)

In the bidirectional thermal storage system,
a heat network comprising at least one consumer capable of heat production and heat consumption and a heat network pump for heat circulation;
a quarterly heat storage tank supplied with heat collected by a collector;
a late-night heat storage tank receiving heat returned from the heat network or supplying heat to the heat network;
a heat pump for increasing the temperature of the heat supplied to the late-night heat storage tank;
A control device for controlling the heat flow between the quarterly heat storage system and the heat network by controlling the heat pump and the heat network pump based on the heat produced or consumed by the consumer and the heat generated through the collector
Bi-directional quarterly heat storage system.
According to claim 1,
The control device analyzes the heat produced or consumed by the consumer for a preset period before control and predicts and compares the amount of heat generated through the collector for a preset period after control and the thermal load of the heat network, Bi-directional quarterly heat storage system, characterized in that the on-off control of the pump.
3. The method of claim 2,
When the predicted heat load is greater than the predicted amount of generated heat according to the comparison result, the generated heat is directly supplied to the heat network, and the heat stored by the late-night heat storage tank is supplied to the heat network. .
4. The method of claim 3,
The control device turns on a heat pump to store heat in the late-night heat storage tank when the predicted heat load is greater than the heat stored in the late-night heat storage tank.
5. The method of claim 4,
wherein the control device calculates an operation required time based on the predicted heat load and the heat pump capacity, and turns on the heat pump for as long as the operation required time during the late night time.
6. The method of claim 5,
Wherein the control device sets the operation time of the heat pump so as not to overlap with the expected maximum load time.
6. The method of claim 5,
wherein the control device sets the operation time of the heat pump based on the real-time electricity rate collected in advance.
According to claim 1,
The control device predicts a first heat load for 24 hours and a second heat load for every hour unit, and when it is predicted that both the first heat load and the second heat load are lowered below a preset standard, the heat network pump Bi-directional quarterly heat storage system, characterized in that the power is turned off or controlled to the lowest flow rate.
3. The method of claim 2,
The bidirectional quarterly heat storage system, characterized in that the preset period is 24 hours.
3. The method of claim 2,
wherein the control device predicts the amount of heat generated through the collector for a preset period with reference to weather data.

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