KR101405521B1 - Thermal storage tank of cooling and heating system using heating pump and optimal control method of thermal storage energy - Google Patents

Abstract

The present invention relates to a thermal storage tank of a heat pump type cooling and heating system and a method for the same comprising: at least three heat storage tanks for separately storing cold water and warm water by dividing water into the cold water and warm water; a supplying water line and a collecting water line for supplying and collecting the cold and warmth heat storage water, which is generated in a heat pump, to the heat storage tank; a supplying water line and a circulating water line for discharging and circulating the cold and warmth heat storage water, which is stored in the heat storage tank, to a heating and cooling load system; at least one open and close valve installed in the supplying water line, the collecting water line, the supplying water line, and the circulating water line; and a control part for converting and varying a warm water or cold water storage tank of the heat storage tank by opening or closing the open and close valve, and changing the direction of a flow path. According to the present invention, the thermal storage tank is capable of corresponding cooling and heating loads since the cold water and warm water storage tank can be varied according to season and time by changing the direction of the flow path, and opening or closing the open and close valve installed in the supplying water line and the collecting water line connected to each thermal storage tank from the heat pump. Therefore, the present invention has an effect for saving costs and space by installing and operating the minimum capacity of the thermal storage tank.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat pump, and more particularly, to a heat pump, a heat pump, and a heat pump,

The present invention relates to a heat storage tank of a heat pump type cooling / heating system and a method of controlling the operation of optimizing heat storage energy, and more particularly, to a variable heat / The present invention relates to a heat storage tank of a heat pump type cooling / heating system and an operation control method of optimizing heat storage energy.

Generally, a heat pump type cooling and heating system absorbs heat at a low temperature heat source such as air heat, hydrothermal, geothermal, etc. at a low temperature and generates high temperature heat which can be used. In the process of operating the heat pump, the high temperature heat generated by the condenser is used for heating and hot water supply, and the cold heat cooled by the evaporator is used for cooling.

In addition, the heat pump is operated in the middle of the night when the low-end electric power charge is applied, and the generated hot water and cold water are separately stored in the heat storage tank and then supplied to the daytime cooling / heating load side. This is a system that distributes power in the night time zone and suppresses peak power and improves the power load level by increasing the reception capacity of the nighttime power.

The conventional heat pump type heat and cold water storage system is divided into cold and hot water according to the heating load, and several tons to several hundred tons are stored depending on the heating load. The capacity of the cold water heat storage tank and the hot water storage tank is fixed after construction.

Therefore, in order to cope with the maximum cooling and heating load during the summer and winter, inevitably large-capacity hot and cold water storage tanks need to be installed separately. To install such large capacity heat storage tanks separately, enormous equipment cost, space, and maintenance cost .

In order to solve such a problem, Korean Patent No. 10-1080287 discloses a heat pump water storage system for a heat pump in which the inner space of the water storage tank is separated by a temperature separation plate and the temperature separation plate can be changed without power driving United States Patent No. 6907923 B2 discloses a system for installing a mechanical boundary plate between a low temperature storage tank and a high temperature storage tank and a heat storage tank for a high temperature water system which floats the mechanical boundary plate in accordance with the high temperature water or low temperature water drainage mode. (Storage Tank for Hot Water System).

FIG. 1 (a) is a representative drawing of Korean Patent No. 10-1080287. As shown in the drawing, the temperature dividing plate of the internal space of the water storage tank is moved by the height difference A between the first space and the second space However, it is difficult to apply the present invention to a large-sized thermal storage tank storing tens to hundreds of tones due to sealing problems of the water storage tank and the temperature separator, and frictional resistance problems.

1 (b) is a representative drawing of U.S. Patent No. 6907923 B2. As shown in the figure, the mechanical boundary plate floats due to the density difference between the low temperature water and the high temperature water. However, The efficiency of the heat pump is reduced due to the internal heat transfer and the mixing loss of the mechanical boundary plate for separating the low temperature water and the low temperature water.

1. Korean Registered Patent No. 10-1080287 (October 31, 2011) 2. US Patent 6907923 B2 3. Korean Patent No. 10-0923206 (Oct. 15, 2009) 4. Korean Patent No. 10-0411240 (December 2, 2003) 5. Korean Patent No. 10-0857222 (September 1, 2008)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a heat storage tank system and a heat storage tank control method capable of flexibly responding to fluctuations of cooling / heating load by season and time by using only a minimum capacity storage tank in a heat pump type cooling / And to provide the above objects.

According to an aspect of the present invention, there is provided a heat pump type cooling / heating system comprising: three or more heat storage tanks for separately storing cold water and hot water; A supply water line and a recovery water line for discharging and circulating the cold storage water stored in the storage tank to the cooling / heating load facility, a supply water line and a recovery water line, and a supply water line And a controller for changing over the hot water or cold water storage tank of the storage tank by a combination of opening and closing of the opening / closing valve and switching of the flow direction.

In order to reduce the temperature fluctuation in the heat storage tank, it is preferable that a distributor for discharging or sucking the dispersion is installed at the end of the supply water line and the recovery line immersed in the heat storage tank.

In order to realize unattended automation, it is preferable that the open / close valve installed in the supply water line and the recovery line is integrally provided with a movable part capable of remotely controlling by wire or wireless.

In addition, in order to monitor and control the amount of heat of the heat storage tank, it is preferable that a sensor unit having a temperature sensor for measuring the temperature and a calorimeter for measuring the heat amount of the cooling / heating load side is provided in the supply water line and the circulation water line.

In order to realize the automation of the system, the control unit includes an input unit for inputting the maximum cooling / heating heat quantity data of the heat pump, the seasonal and hourly electric power charge data, the heat quantity of heat of cold / hot water of each heat storage tank, An interface for receiving the measurement data of the sensor unit, a storage unit for storing the input data and the measurement data, and a control unit for inputting the optimum number of cold water and hot water storage tank in accordance with the control formula pre- And an output unit for transmitting the result of the operation of the operation unit to the opening / closing valve by wire / wireless communication means.

In order to accomplish the above object, the present invention provides a heat pump control method for a heat pump type cooling / heating system, comprising: a heat pump heat quantity input step for inputting maximum heat / cold water data that can be produced by a heat pump; A power charge input step of inputting power rate data by time and a power rate data input step of inputting power rate data by time, a heat storage tank heat calculation step of calculating heat storage heat of cold / hot water of each heat storage tank, Heating / heating load prediction step of predicting the cooling / heating load by measuring the heat / cold / heat load of the heat pump, the maximum cooling / heating calorific value data of the heat pump, the seasonal and hourly power rate data, From the predicted data, the outside temperature, the heating load predicted and calculated from the cooling and heating conditions, etc., the optimum number of hot and cold water storage tanks is arranged. Step and, according to the cooling and hot water storage tank disposed in the optimum number of the heat storage tank by controlling the on-off valve and a heat storage tank conversion arrangement comprising: a variable-capacity storage tank for the cooling and hot water.

In the heat storage tank of the heat pump type cooling / heating system of the present invention, the cold water and the hot water storage tank are changed by season and time zone by opening / closing of the supply water line connected to the respective storage tank and the opening / So that it can flexibly cope with the cooling / heating load. As a result, it is possible to install and operate a minimum capacity heat storage tank, thereby saving cost and space.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a heat storage tank variable system disclosed in the prior art. FIG.
FIG. 2 is a schematic view illustrating a heat pump type cooling / heating system according to an embodiment of the present invention; FIG.
3 is an enlarged plan view illustrating a variable-temperature state of the storage tank of Fig. 2;
4 is a flowchart illustrating a control method of a heat pump type cooling / heating system according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view illustrating a heat pump type cooling / heating system according to an embodiment of the present invention. As shown in FIG. 2, the heat pump type cooling / heating system of the present invention includes a geothermal or air heat source, A heat pump 10 for producing cold water and hot water using one of these various heat sources, a heat storage tank 10 for storing cold water and hot water generated by the operation of the heat pump, cold water And heating and cooling equipment using hot water.

In the embodiment of the present invention, the heat storage tank 10 is composed of first, second, and third heat storage tanks 10a, 10b, and 10c that are partitioned to separately store cold water and hot water. However, in the case where the storage capacity is small, the storage tanks 10a, 10b, and 10c, which are independent containers, may be used instead of the storage tanks 10a, 10b, and 10c partitioned by the partition walls. It is preferable that the heat storage tanks 10a, 10b, and 10c are constructed in a heat dissipation structure in order to minimize heat loss.

A hot water supply line 20 for supplying hot water generated from a heat pump is provided in the thermal storage tanks 10a, 10b and 10c divided into a heat pump and a thermal storage tank 10 and a partition wall, And is piped to a hot water recovery line (22) for recovery by a pump. A cold water supply line 24 for supplying cold water generated by the heat pump and a cold water recovery line 26 for recovering cold water stored in the thermal storage tank 10 by a heat pump are connected to the piping.

The distributor 12 of the pore tube is connected to the end of the supply water line 20 and the recovery line 22 immersed in the heat storage tanks 10a, 10b and 10c in order to reduce the temperature deviation in the heat storage tanks 10a, 10b and 10c . Hot water and cold water supplied to or recovered from the heat storage tanks 10a, 10b, and 10c are dispersed or sucked through the distributor 12 of the porous tube to minimize temperature variations.

The supply water lines 20 and 24 connected to the storage tanks 10a to 10c and the recovery lines 22 and 26 are provided with opening and closing valves for switching the storage tanks 10a to 10c to the cold water or hot water storage tank, (V1 to V12) are installed. It is preferable that the opening and closing valves V1 to V12 are integrally provided with a movable part capable of remote control by wire or wireless in order to realize unattended automation.

2 shows a state in which the first storage tank 10a is switched to the hot water storage tank and the second and third storage tanks 10b and 10c are switched to the cold water storage tank. At this time, the open / close valves V6 and V8 provided in the hot water supply line 20 and the hot water collection line 22 are closed to convert the first storage tank 10a into the hot water storage tank. In order to convert the second and third heat storage tanks 10b and 10c into the cold water storage tank, the open / close valves V1 and V2 provided in the cold water supply water line 24 are opened to supply the cold water produced by the heat pump.

3 (a) shows the first and second thermal storage tanks 10a and 10b as a hot water storage tank and the third storage tank 10c as a cold water storage tank. Storage tank. At this time, in order to convert the first and second thermal storage tanks 10a and 10b into the hot water storage tank, the open / close valves V6 and V8 provided in the hot water supply line 20 and the hot water collection line 22 are opened, , V4) are closed. An open / close valve V1 provided in the cold water supply line 24 and an open / close valve V3 provided in the cold water collection line 26 are opened to convert the third storage tank 10c into the cold water storage tank, Closing valves (V5, V7) installed in the piping connected to the pipes (10a, 10b) are closed.

Fig. 3 (b) shows a state in which the entire heat storage tanks 10a, 10b, and 10c are converted into the cold water storage tanks. In order to convert the whole of the thermal storage tanks 10a, 10b and 10c into the cold water storage tanks, the cold water supply lines 24 and the cold water collection lines 26 are connected to the piping by the second and third heat storage tanks 10b and 10c Only the open / close valves V5 and V7 are closed, and the other open / close valves V1 to V4, V6 and V8 are opened to supply only the cold water generated from the heat pump and store and recover the same.

3 (c) shows a state in which the whole of the thermal storage tanks 10a, 10b, and 10c is switched to the hot water storage tank as opposed to FIG. 3 (b). In order to convert the entire heat storage tanks 10a, 10b and 10c into the cold water storage tanks, the cold water supply lines 24 and the cold water collection lines 26, which are provided in the piping by the second and third heat storage tanks 10b and 10c, Only the open / close valves V5 and V7 to be connected are closed, and the other open / close valves V1 to V4, V6 and V8 are opened to supply only the hot water generated by the heat pump to be stored and recovered.

A hot water supply line 30 for supplying hot water stored in the thermal storage tank 10 to the heating and heating equipment of the cooling and heating facility and a hot water circulation water line 32 are connected to the piping. A cold water supply water line (34) for supplying cold water stored in the thermal storage tank (10) to the cooling device of the cooling and heating equipment and a cold water circulation water line (34) returning cold water from the cooling device are provided between the thermal storage tank (10) (36) are connected by piping.

In the case of cooling and heating in the time zone in which the nighttime power charge is applied, there is provided a cold / hot supply water line 30, 34 between the heat pump and the cooling / heating equipment, To V12) to allow the hot / cold water generated by the heat pump to be directly supplied to the cooling / heating equipment.

A sensor unit 34 constituted by a calorimeter and a temperature sensing unit is installed in the cold / hot water supply lines 30, 34 and the circulating water lines 32, 36 adjacent to the thermal storage tank 10. The signal measured by the sensor unit 34 is transmitted to the control unit 40 in a wireless manner.

The control unit 40 shown in the lower part of FIG. 2 as a block inputs the maximum cooling / heating calorific value data of the heat pump, the electricity rate data by season and time, the heat quantity of heat of cool / hot water of each storage tank, An interface 44 for receiving the measurement signal of the sensor unit 34, a storage unit for storing the input data and the measurement data, a data storage unit for storing the optimal cold water and the optimum cold water, An operation unit for performing an operation of combining the opening and closing of the open / close valves V1 to V12 to arrange the hot water storage tank, an output unit for transmitting the result of the operation unit to the movable unit of the open / close valves V1 to V12 46).

The control unit 40 may include a PLC or a computer system having an input unit 42, an interface 44, and an output unit 46. The input unit 42 is constituted by a keyboard or a keypad, which can input a control formula of the open / close valves V1 to V12, a power charge by time, and the like. The interface 44 mainly converts the signal of the sensor unit 34 so that the control unit 40 can recognize it, or provides a communication protocol.

The output unit 46 converts the controlled operation result of the open / close valves V1 to V12 into a relay contact signal or an ON / OFF signal, and transmits the relay contact signal or the ON / OFF signal to the wire / wireless communication means to operate the open / close valves V1 to V12.

4 is a flowchart schematically illustrating a control method of a heat pump type cooling / heating system according to an embodiment of the present invention. In the method of controlling a heat pump of a heat pump type cooling / heating system of the present invention, (S10) for inputting the maximum amount of cold / hot water heat quantity that can be produced, a power rate inputting step (S20) for inputting the electricity rate data for each season and time period, A cooling / heating load prediction step (S40) of estimating the cooling / heating load by measuring the outside temperature and the water temperature supplied and recovered at the cooling / heating load side at a predetermined time interval, The data of maximum heat and heat of the heat pump, the electricity rate data by season and time, the heat and heat of the heat of hot and cold water of each heat storage tank, the weather forecast data and the outside temperature, (S50) for arranging the optimum number of cold / hot water storage tanks from the calculated heating load or the like, and adjusting the open / close valve of the corresponding storage tank according to the optimum number of hot / And a heat storage tank switching arrangement step (S60) for varying the storage tank capacity of the hot water.

The heat pump calorie input step S10 is a step of inputting the production capacity per unit time of the cold / hot water of the heat pump in units of calories. The production capacity per hour of cold / hot water varies greatly according to the cold water that is recovered from the heat source and the heat storage tank to be used. Therefore, it provides basic data that can be used to calculate the amount of cold / hot water heat that the heat pump can produce at midnight power time.

The power charge input step (S20) is a basic data for performing the optimal arrangement of the heat pump operation time and the heat storage tank by inputting the nighttime power and the electric power charge at that time.

The heat storage calorie calorie calculating step S30 is a step of calculating the heat storage amount according to the size of the heat storage tank, the arrangement of the cold / hot water storage tank, and the cool / hot water temperature supplied from the heat pump.

The cooling / heating load prediction step (S40) estimates the amount of heat exchange loss per unit time of the cooling / heating load by measuring the outside temperature at the time of cooling / heating, the daily weather forecast data, and the temperature and flow rate supplied / circulated to the heating / And determines the heat pump operation time.

The opening / closing valve combination calculation step S50 includes a production capacity per hour unit of cold / hot water inputted in the heat pump heat quantity input step S10, a midnight power application time and a power charge inputted in the electric power rate input step S20, And the heat quantity of heat exchange loss per unit time of the cooling / heating load obtained in the cooling / heating load predicting step (S40), which are calculated in step S30, The combination of the opening and closing valves of the heat storage tank is calculated so that the number of the hot and cold water storage becomes.

In the heat storage tank switching arrangement step (S60), the open / close valve is adjusted according to the result obtained in the opening / closing valve combination calculation step (S50), and the storage tank is arranged so as to be stored in the cold / hot water.

10: thermal storage tanks 10a to 10c: first to third thermal storage tanks
12: Distributor
20: supply water line 22: recovery line
30: feed water line 32: circulation water line
34: Sensor part V1 to V12: Opening and closing valve
40: control unit 42:
44: interface 46: output section

Claims (6)

In heat storage tank of heat pump type cooling and heating system.
Three or more heat storage tanks which can separate cold water and hot water separately,
A supply water line and a recovery line for supplying cold storage water generated in the heat pump to the respective heat storage tanks,
A supply water line and a circulation water line for discharging the cold storage water stored in the storage tank to the cooling / heating load facility,
An open / close valve provided at least one of the supply water line and the recovery line, the supply water line and the circulation water line,
A distributor installed to disperse or suck in the end of the supply water line and the recovery line immersed in the thermal storage tank,
An open / close valve installed in the supply water line and the recovery line and integrally provided with a movable part capable of remotely controlling by wire or wireless,
A sensor unit having a calorimeter installed to measure the amount of heat of the cooling / heating load side and a temperature sensing unit installed to measure the temperature,
And a controller for changing the hot water or cold water storage tank of the heat storage tank by a combination of opening and closing of the opening / closing valve and switching of the flow direction of the refrigerant. delete delete delete The method according to claim 1,
Wherein the control unit receives an input unit for inputting maximum heat / cooling heat quantity data of the heat pump, electricity / charge data for each season and time period, heat and heat quantity of heat of cold / hot water of each heat storage tank and weather prediction data, An optimum number of cold water and hot water storage tanks are arranged in accordance with the control data entered in advance and the data stored in the storage unit, and an operation of combining the open / close flow paths of the open / close valves And an output unit for transmitting the result of the operation of the operation unit to the on-off valve by wire / wireless communication means. delete

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