Dual seasonal thermal storage system capable of storing external heat and cold energy

Abstract

The present invention relates to a seasonal thermal storage system and, specifically, to a dual seasonal thermal storage system capable of storing external heat and cold energy, the system having a seasonal heat energy storage tank and a seasonal cold energy storage tank that employ any one from among aquifer thermal energy storage (ATES), borehole thermal energy storage (BTES), pit thermal energy storage (PTES), and tank thermal energy storage (TTES), so as to store heat emitted from a heat pump or apply heat to the heat pump so that the desired cold energy or heat energy is produced, and being capable of storing external heat energy and cold energy in the seasonal heat energy storage tank and the seasonal cold energy storage tank according to season.

Description

Dual interlayer heat storage system capable of storing external heat and cold

[0001] The present invention relates to a seasonal thermal storage system, and more particularly, to a dual seasonal thermal storage system that stores heat emitted from a heat pump or applies heat to the heat pump side to produce desired cold heat or hot heat by installing a hot seasonal thermal storage tank and a cold seasonal thermal storage tank according to any one of an aquifer method (ATES), a borehole method (BTES), a pit method (PTES), and a tank method (TTES), and can store external hot and cold heat in the hot seasonal thermal storage tank and the cold seasonal thermal storage tank according to the season.

[0002] Historically, as economies develop, energy use and greenhouse gas emissions increase. To avoid the high price volatility of fossil fuels like oil, coal, and natural gas, we must reduce our dependence on fossil fuels. Furthermore, with climate change resulting from increased greenhouse gas emissions emerging as a global problem, the use of new and renewable energy sources is an inevitable reality. In particular, following the first and second oil crises of the 1970s, as well as environmental pollution such as global warming and ozone layer depletion, countries around the world have actively promoted restrictions on fossil fuel use and the promotion of new and renewable energy sources. Countries have set greenhouse gas reduction targets for 2025-2030, made various pledges, and are striving to implement them.

[0003] Over the past 40 years, new and renewable energy (including geothermal, solar, wind, tidal, wave, biodiesel, biofuel, biogas, and waste) in OECD countries has grown significantly by an annual average of 2.5%. In particular, new and renewable energy in OECD countries increased from 160 million TOE in 1971 to 440 million TOE in 2012, with an annual average growth of 2.8% during this period (solar and wind power showed an average annual growth of 18.8% over the same period compared to other energy sources). This is due to the countries' policies to expand solar and wind energy, and they are actively promoting research to improve technology as a project of the International Energy Association (IEA) by establishing an international cooperative system to reduce the use of fossil fuels worldwide.

[0004] Domestic new and renewable energy facilities are smaller in scale than existing energy facilities, have lower capital costs, and are technology-intensive. Therefore, technologies with superior performance and price competitiveness are dominating the market. There is demand for highly stable new and renewable energy technologies, new and renewable energy + energy storage technologies (thermal storage systems), and new and renewable energy + smart grids.

[0005] Except for some new and renewable energy sources such as wind and tidal power, the impact on environmental regulations is minimal. Nuclear and thermal power do impact the surrounding environment, but solar thermal energy, photovoltaic power, and fuel cells are easy to install in buildings and have relatively little impact on environmental regulations.

[0006] The domestic new and renewable energy industry initially focused on technology development and did not have room to consider commercialization, but with the creation and full-scale implementation of various systems to promote distribution, it is expanding in domestic and international markets. In the case of the housing support project among the new and renewable energy distribution projects, the distribution goal is to gradually expand the supply of new and renewable energy to about 10% of housing by 2020, and to supply solar power, solar thermal power, fuel cells, and geothermal power to about 1 million households out of about 12.5 million households.

[0007] Meanwhile, a demand response system is in operation due to the spread of new and renewable energy.

[0008] These demand response systems allow electricity users to vary their usage to match current electricity demand.

[0009] Because electricity cannot be easily stored, power companies historically balanced supply and demand by maximizing power plant output, operating both online and offline power generation facilities, or importing power from other power companies. However, even this approach has limitations. Some power plants can take a long time to reach full capacity, some are expensive to operate, and at times, demand can exceed the combined output of all power plants. Therefore, demand response systems emerged, regulating demand rather than supply.

[0010] Furthermore, electricity consumption and generation in the power grid must always be balanced. Severe imbalances can cause grid instability, severe voltage fluctuations, and even failures within the grid. Therefore, total generation capacity must be equal to peak demand plus some reserve capacity to allow for a certain level of error and contingency (e.g., a power plant going offline during peak demand). Power plant operators typically use the least expensive generation capacity and deploy additional capacity from more expensive plants as demand increases.

[0011] Thus, demand response schemes aim to reduce peak demand to reduce the risk of potential disruption, eliminate the need for additional capital costs for additional power plants, and reduce the use of more expensive or less efficient power plants.

[0012] For example, Jeju Island's excessive wind power generation could cause grid problems, leading to dozens of power output restrictions through 2020. Furthermore, Jeju Island's high proportion of new and renewable energy generation accounts for up to 60% of the island's total power demand when electricity demand is high.

[0013] In response to this demand response system, there is a need to develop a system that effectively uses surplus electricity from new and renewable energy sources.

[0014] As an example of a storage technology for surplus power from new and renewable energy sources, a seasonal storage system has been introduced.

[0015] Seasonal heat storage is a heat storage method that stores surplus heat from the off-season and uses it during the peak season when heat demand is high. It uses (waste) heat produced throughout the year, such as power generation waste heat, industrial waste heat, waste incineration heat, fuel cells, biomass, and solar heat, as a heat source. Heat that is intermittent, has an unstable discharge temperature, or is difficult to use for power generation or industrial purposes due to low temperatures can also be recovered and used for heating and cooling buildings or for agricultural purposes.

[0016] Meanwhile, these inter-seasonal storage systems are largely divided into four types: the tank method (TTES) in which a tank is buried underground; the pit method (PTES) in which a pit is formed in a rock layer and the thermal storage material is placed inside the pit; the borehole method (BTES) in which a "U"-shaped pipe is buried vertically underground; and the aquifer method (ATES) in which two wells are dug in the aquifer to suck groundwater from one location and inject it into the other.

[0017] As an example of this type of inter-temperature storage system using an aquifer, the alluvial aquifer inter-temperature storage greenhouse heating and cooling system, registered in Korea as Patent No. 10-2000481, is disclosed.

[0018] The above alluvial aquifer inter-seasonal storage greenhouse heating and cooling system, as illustrated in FIGS. 1 and 2, uses groundwater stored in an alluvial aquifer to perform heating and cooling of a greenhouse, and includes a cold water main well (100) installed underground for pumping and injecting cold water, a hot water main well (200) installed underground for pumping and injecting hot water, a heat pump (300) for cooling a greenhouse (700) through heat exchange of cold water pumped from the cold water main well (100) and for heating a greenhouse (700) through heat exchange of hot water pumped from the hot water main well (200), a cold water auxiliary well (400) installed around the cold water main well (100) for distributed injection of cold wastewater discharged from the heat pump (300), and a hot water auxiliary well (500) installed around the hot water main well (200) for distributed injection of hot wastewater discharged from the heat pump (300).

[0019] The above alluvial aquifer inter-seasonal storage greenhouse heating and cooling system is divided into summer and winter seasons, and is used for cooling the greenhouse in the summer and for heating the greenhouse in the winter.

[0020] For example, in the summer, as shown in Fig. 1, cold water stored in an alluvial aquifer is pumped through a cold water main well (100) and supplied to a heat pump (300), and cooling of a greenhouse (700) is performed through heat exchange using the heat pump (300), and the hot water heated by the heat exchange in the heat pump (300) is discharged to a hot water main well (200) and stored in the alluvial aquifer.

[0021] On the other hand, in the winter season, as shown in Fig. 2, hot water stored in the alluvial aquifer is pumped through the hot water main well (200) and supplied to the heat pump (300), and the greenhouse (700) is heated through heat exchange using the heat pump (300), and the cold drainage water cooled by the heat exchange in the heat pump (300) is discharged to the cold water main well (100) and stored in the alluvial aquifer.

[0022] However, these conventional alluvial aquifer seasonal storage greenhouse heating and cooling systems use heat pumps to store heat in the cold seasonal storage tank when producing heating heat in the winter, and to store heat in the hot seasonal storage tank when producing cooling heat in the summer. In this case, only when the annual heating and cooling production demands are appropriately balanced can the heat storage capacity and cold storage capacity be balanced, allowing for stable storage tank performance over many years of use. However, since the reality is that one type of heating or cooling production is generally more demanded, the balance can be achieved by additionally storing the insufficient cold or hot heat from an external source in the cold seasonal storage tank or the hot seasonal storage tank.

[0023] In addition, as the amount of heat storage and cold storage increases, the amount of heating and cooling heat that can be produced using the heat pump increases. Therefore, in order to increase the amount of heat production, in addition to storing the heat generated by the heat pump itself, additional cold storage and heat storage from an external heat source are required.

[0024] <Prior Art Literature>

[0025] Patent Document

[0026] Domestic Patent No. 10-2000481

[0027] The present invention is to meet the above-mentioned needs, and the purpose of the present invention is to provide a dual seasonal storage system capable of storing external hot and cold heat by installing a hot seasonal storage tank and a cold seasonal storage tank according to any one of the aquifer method (ATES), the borehole method (BTES), the pit method (PTES), and the tank method (TTES) to store heat emitted from a heat pump or to apply heat to the heat pump side to produce the desired cold heat or hot heat, and to store external hot and cold heat in the hot seasonal storage tank and the cold seasonal storage tank according to the season.

[0028] In addition, another purpose of the present invention is to provide a dual inter-seasonal heat storage system that can store external heat and cold heat to efficiently use energy by using new and renewable energy or unused energy as external heat and cold sources.

[0029] The features of the present invention to achieve the above purpose are as follows:

[0030] It is characterized by comprising: a heat pump; a cold heat seasonal storage tank of an aquifer type (ATES) that stores cold heat produced in an evaporator of the heat pump or supplies cold heat stored in a condenser of the heat pump; a hot heat seasonal storage tank of an aquifer type (ATES) that stores hot heat produced in a condenser of the heat pump or supplies hot heat stored in an evaporator of the heat pump; a cold heat heat exchanger that heat-exchanges an external cold heat source with a heat medium discharged from the evaporator of the heat pump to lower the temperature and stores the lowered temperature in the cold heat seasonal storage tank; and a hot heat heat exchanger that heat-exchanges an external hot heat source with a heat medium discharged from the condenser of the heat pump to raise the temperature and stores the higher temperature in the hot heat seasonal storage tank.

[0031] Here, the dual seasonal heat storage system capable of storing external heat and cold heat is such that in winter, the heat medium stored in the thermal seasonal heat storage tank is first cooled down through the evaporator of the heat pump, and then, when the temperature of the external cold heat source is lower than the discharge temperature of the evaporator, the heat is cooled down again by the cold heat absorbed by the cold heat exchanger and injected into the cold seasonal heat storage tank, and the heat is produced in the condenser of the heat pump.

[0032] Here, also, the dual seasonal heat storage system capable of storing external heat and cold heat is such that in the summer, the heat medium stored in the cold seasonal heat storage tank is first heated through the condenser of the heat pump, and then, when the temperature of the external heat source is higher than the discharge temperature of the condenser, the heat is reheated with the heat absorbed by the hot heat exchanger and injected into the hot seasonal heat storage tank, and cold heat is produced in the evaporator of the heat pump.

[0033] Here again, the external heat and cold sources are new and renewable energy or unused energy.

[0034] Another feature of the present invention is:

[0035] It is characterized by comprising: a heat pump; a cold seasonal storage tank of an aquifer type (ATES) that stores cold heat produced in an evaporator of the heat pump or supplies cold heat stored to a condenser of the heat pump; a hot seasonal storage tank of an aquifer type (ATES) that supplies heat to the evaporator of the heat pump or stores hot heat produced in the condenser; and a common heat exchanger that heat-exchanges an external cold heat source with a heat medium discharged from the evaporator of the heat pump to lower the temperature and stores it in the cold seasonal storage tank, or heat-exchanges an external hot heat source with a heat medium discharged from the condenser of the heat pump to raise the temperature and store it in the hot seasonal storage tank.

[0036] Here, the dual seasonal heat storage system capable of storing external heat and cold heat is such that in winter, the heat medium stored in the thermal seasonal heat storage tank is first cooled down through the evaporator of the heat pump, and then, when the temperature of the external cold heat source is lower than the discharge temperature of the evaporator, the heat is cooled down again by the cold heat absorbed by the common heat exchanger and injected into the cold seasonal heat storage tank, and the heat is produced in the condenser of the heat pump.

[0037] Here, also, the dual seasonal storage system capable of storing external heat and cold heat is such that in the summer, the heat medium stored in the cold seasonal storage tank is first heated through the condenser of the heat pump, and then, when the temperature of the external heat source is higher than the discharge temperature of the condenser, it is heated again with the heat absorbed by the common heat exchanger and injected into the hot seasonal storage tank, and cold heat is produced in the evaporator of the heat pump.

[0038] Here again, the external heat and cold sources are new and renewable energy or unused energy.

[0039] Another feature of the present invention is:

[0040] The present invention is characterized by comprising: a heat pump; a cold seasonal storage tank that absorbs heat emitted from a condenser of the heat pump and follows any one of a borehole type (BTES), a pit type (PTES), and a tank type (TTES); a hot seasonal storage tank that supplies heat to an evaporator of the heat pump and follows any one of a borehole type (BTES), a pit type (PTES), and a tank type (TTES); a cold heat exchanger that exchanges heat with a heat medium circulated with an external cold heat source to lower the temperature and store the lowered temperature in the cold seasonal storage tank; and a hot heat exchanger that exchanges heat with a heat medium circulated with an external hot heat source to raise the temperature and store the higher temperature in the hot seasonal storage tank.

[0041] Here, the dual seasonal heat storage system capable of storing external heat and cold heat supplies heat from the hot seasonal heat storage tank to the evaporator of the heat pump in winter to produce heating heat in the condenser, and when the temperature of the external cold heat source is lower than the outlet temperature of the cold seasonal heat storage tank, the cold heat absorbed by the cold heat exchanger is stored in the cold seasonal heat storage tank.

[0042] Here, the dual seasonal heat storage system capable of storing external heat and cold absorbs heat emitted from the condenser of the heat pump in the cold seasonal heat storage tank during the summer and produces cooling heat in the evaporator, and when the temperature of the external heat source is higher than the outlet temperature of the hot seasonal heat storage tank, the heat absorbed by the hot heat exchanger is stored in the hot seasonal heat storage tank.

[0043] Here again, the external heat and cold sources are new and renewable energy or unused energy.

[0044] Another feature of the present invention is:

[0045] A heat pump; a cold seasonal storage tank that absorbs heat emitted from a condenser of the heat pump and follows any one of a borehole type (BTES), a pit type (PTES), and a tank type (TTES); a hot seasonal storage tank that supplies heat to an evaporator of the heat pump and follows any one of a borehole type (BTES), a pit type (PTES), and a tank type (TTES); and a common heat exchanger that exchanges heat with an external cold heat source and a circulated heat medium to lower the temperature and store it in the cold seasonal storage tank, or exchanges heat with an external hot heat source and a circulated heat medium to raise the temperature and store it in the hot seasonal storage tank.

[0046] Here, the dual seasonal heat storage system capable of storing external heat and cold heat supplies heat from the hot seasonal heat storage tank to the evaporator of the heat pump in winter to produce heating heat in the condenser, and when the temperature of the external cold heat source is lower than the outlet temperature of the cold seasonal heat storage tank, the cold heat absorbed by the common heat exchanger is stored in the cold seasonal heat storage tank.

[0047] Here, the dual seasonal heat storage system capable of storing external heat and cold heat absorbs heat emitted from the condenser of the heat pump in the cold seasonal heat storage tank during the summer season and produces cooling heat in the evaporator, and when the temperature of the external cold heat source is higher than the outlet temperature of the hot seasonal heat storage tank, the heat absorbed by the common heat exchanger is stored in the hot seasonal heat storage tank.

[0048] Here again, the external heat and cold sources are new and renewable energy or unused energy.

[0049] According to the dual seasonal storage system capable of storing external heat and cold heat, which is the present invention and is configured as described above, a hot seasonal storage tank and a cold seasonal storage tank using any one of the aquifer method (ATES), the borehole method (BTES), the pit method (PTES), and the tank method (TTES) are installed to store heat emitted from a heat pump or to apply heat to the heat pump side to produce the desired cold heat or hot heat, and external heat and cold heat can be stored in the hot seasonal storage tank and the cold seasonal storage tank depending on the season.

[0050] In addition, according to the present invention, energy can be used efficiently by using new and renewable energy or unused energy as external heat and cold sources.

[0051] Figures 1 and 2 are drawings showing the configuration of a conventional alluvial aquifer inter-temperature storage greenhouse heating and cooling system.

[0052] FIG. 3 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to the first embodiment of the present invention.

[0053] FIG. 4 and FIG. 5 are explanatory diagrams for explaining the winter and summer operating states of a dual inter-seasonal heat storage system capable of storing external heat and cold according to the first embodiment of the present invention.

[0054] Figure 6 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to a second embodiment of the present invention.

[0055] FIG. 7 and FIG. 8 are explanatory diagrams for explaining the winter and summer operating states of a dual inter-seasonal heat storage system capable of storing external heat and cold according to a second embodiment of the present invention.

[0056] Figure 9 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to a third embodiment of the present invention.

[0057] Figures 10 and 11 are explanatory diagrams for explaining the winter and summer operating states of a dual inter-seasonal heat storage system capable of storing external heat and cold according to a third embodiment of the present invention.

[0058] Fig. 12 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to the fourth embodiment of the present invention.

[0059] Figures 13 and 14 are explanatory diagrams for explaining the winter and summer operating states of a dual-season heat storage system capable of storing external heat and cold according to the fourth embodiment of the present invention.

[0060] Hereinafter, the configuration of a dual-stage heat storage system capable of storing external heat and cold according to embodiments of the present invention will be described in detail with reference to the attached drawings.

[0061] In the following description of the present invention, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present invention. Furthermore, the terms described below are defined in light of their functions within the present invention and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0062] 《First Embodiment》

[0063] FIG. 3 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to the first embodiment of the present invention.

[0064] Referring to FIG. 3, a dual intercooling system (1) capable of storing external heat and cold heat according to the first embodiment of the present invention is composed of a heat pump (10), a cold intercooling storage tank (20), a hot intercooling storage tank (30), a cold heat exchanger (40), and a hot heat exchanger (50).

[0065] First, the heat pump (10) produces heat in the condenser (13) in the winter and supplies it to heating users, and produces cold heat in the evaporator (11) in the summer and supplies it to cooling users.

[0066] And, the cold heat storage tank (20) is an aquifer type (ATES) in which cold heat (heat medium, cold water, etc.) produced in the evaporator (11) of the heat pump (10) in the winter is stored, and the stored cold heat is supplied to the condenser (13) of the heat pump (10) in the summer.

[0067] In addition, the thermal inter-temperature storage tank (30) is an aquifer type (ATES) in which heat (heat medium, hot water, etc.) produced in the condenser (13) of the heat pump (10) in the summer is stored, and the stored heat is supplied to the evaporator (11) of the heat pump (10) in the winter.

[0068] In addition, a cold heat exchanger (40) is installed between the heat pump (10) and the cold heat seasonal storage tank (20) to exchange heat between an external cold heat source and the heat medium discharged from the evaporator (11) of the heat pump (10) in winter, thereby further lowering the temperature and storing it in the cold heat seasonal storage tank (20). At this time, the cold heat exchanger (40) operates when the temperature of the external cold heat source is lower than the discharge temperature of the evaporator (11) (e.g., 15°C). In addition, new and renewable energy or unused energy is used as the external cold heat source.

[0069] In addition, a thermal heat exchanger (50) is installed between the heat pump (10) and the thermal seasonal storage tank (30) to exchange heat between an external thermal source and the heat medium discharged from the condenser (13) of the heat pump (10) to further increase the temperature and store it in the thermal seasonal storage tank (30). At this time, the thermal heat exchanger (50) operates when the temperature of the external thermal source is higher than the discharge temperature of the condenser (13). In addition, new and renewable energy or unused energy is used as the external thermal source.

[0070] In addition, a dual intercooling system (1) capable of storing external heat and cold heat according to the first embodiment of the present invention comprises a heat pump (10), a cold intercooling storage tank (20), a hot intercooling storage tank (30), a cold heat exchanger (40), and a hot heat exchanger (50), and a plurality of pumps (P) are provided between the heat pump (10), the cold intercooling storage tank (20), the hot intercooling storage tank (30), the cold heat exchanger (40), and the hot heat exchanger (50) to selectively operate according to the flow path, and a three-way valve (not shown) is provided at each connection point to change the flow path.

[0071] Hereinafter, the operation of a dual-stage heat storage system capable of storing external heat and cold according to a first embodiment of the present invention will be described in detail with reference to the attached drawings.

[0072] FIG. 4 and FIG. 5 are explanatory diagrams for explaining the winter and summer operating states of a dual inter-seasonal heat storage system capable of storing external heat and cold according to the first embodiment of the present invention.

[0073] Winter

[0074] Referring to Fig. 4, heat of about 19°C stored in the thermal storage tank (30) is supplied to the evaporator (11) of the heat pump (10), and heat produced in the condenser (13) is supplied to the heating user.

[0075] And, the heat medium of about 15°C, which has been heat-exchanged in the evaporator (11) and has a lowered temperature, is heat-exchanged with an external cold heat source in the cold heat exchanger (40) and then lowered to about 11°C, and then stored in the cold heat storage tank (20). At this time, if the temperature of the external cold heat source is higher than the temperature of the heat medium discharged from the evaporator (11), the cold heat exchanger (40) does not operate.

[0076] Summer

[0077] Referring to Fig. 5, cold heat of about 11°C stored in the cold heat storage tank (20) is supplied to the condenser (13) of the heat pump (10), and cold heat produced in the evaporator (11) is supplied to the cooling heat user.

[0078] And, the heat medium of about 15°C, which has been heat-exchanged in the condenser (13) and has a high temperature, is heat-exchanged with an external heat source in the thermal heat exchanger (50) and then increases to about 19°C and is then stored in the thermal intercooler (30). At this time, if the temperature of the external heat source is lower than the temperature of the heat medium discharged from the condenser (13), the thermal heat exchanger (50) does not operate.

[0079] 《Second Embodiment》

[0080] Figure 6 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to a second embodiment of the present invention.

[0081] Referring to FIG. 6, a dual-season heat storage system (1) capable of storing external heat and cold heat according to a second embodiment of the present invention is composed of a heat pump (10), a cold-season heat storage tank (20), a hot-season heat storage tank (30), and a common heat exchanger (60).

[0082] First, the heat pump (10) produces heat in the condenser (13) in the winter and supplies it to heating users, and produces cold heat in the evaporator (11) in the summer and supplies it to cooling users.

[0083] And, the cold heat storage tank (20) is an aquifer type (ATES) in which cold heat (heat medium, cold water, etc.) produced in the evaporator (11) of the heat pump (10) in the winter is stored, and the stored cold heat is supplied to the condenser (13) of the heat pump (10) in the summer.

[0084] In addition, the thermal inter-temperature storage tank (30) is an aquifer type (ATES) in which heat (heat medium, hot water, etc.) produced in the condenser (13) of the heat pump (10) in the summer is stored, and the stored heat is supplied to the evaporator (11) of the heat pump (10) in the winter.

[0085] In addition, a common heat exchanger (60) is installed between the heat pump (10) and the cold / hot seasonal storage tank (20, 30) to exchange heat between an external cold heat source and the heat medium discharged from the evaporator (11) of the heat pump (10) in the winter to further lower the temperature and store it in the cold seasonal storage tank (20), and in the summer to further raise the temperature and store it in the hot seasonal storage tank (30) by heat-exchanging between an external hot heat source and the heat medium discharged from the condenser (13) of the heat pump (10) in the summer. At this time, the common heat exchanger (60) is operated when the temperature of the external cold heat source is lower than the discharge temperature of the evaporator (11) (for example, 15°C) in the winter, and is operated when the temperature of the external hot heat source is higher than the discharge temperature of the condenser (13) in the summer. In addition, new and renewable energy or unused energy is used as the external hot heat source and the external cold heat source.

[0086] In addition, a dual intercooling system (1) capable of storing external heat and cold heat according to a second embodiment of the present invention is provided with a plurality of pumps (P) between a heat pump (10), a cooling intercooling storage tank (20), a heating intercooling storage tank (30), and a common heat exchanger (60) to selectively operate according to a flow path, and a three-way valve (not shown) is provided at each connection point to change the flow path.

[0087] Hereinafter, the operation of a dual-stage heat storage system capable of storing external heat and cold according to a second embodiment of the present invention will be described in detail with reference to the attached drawings.

[0088] FIG. 7 and FIG. 8 are explanatory diagrams for explaining the winter and summer operating states of a dual inter-seasonal heat storage system capable of storing external heat and cold according to a second embodiment of the present invention.

[0089] Winter

[0090] Referring to Fig. 7, heat of about 19°C stored in the thermal storage tank (30) is supplied to the evaporator (11) of the heat pump (10), and heat produced in the condenser (13) is supplied to the heating user.

[0091] And, the heat medium of about 15°C, which has been heat-exchanged in the evaporator (11) and has a lowered temperature, is heat-exchanged with an external cold heat source in the common heat exchanger (60) and then lowered to about 11°C, and then stored in the cold heat storage tank (20). At this time, if the temperature of the external cold heat source is higher than the temperature of the heat medium discharged from the evaporator (11), the common heat exchanger (60) does not operate.

[0092] Summer

[0093] Referring to Fig. 8, cold heat of about 11°C stored in the cold heat storage tank (20) is supplied to the condenser (13) of the heat pump (10), and cold heat produced in the evaporator (11) is supplied to the cooling heat user.

[0094] And, the heat medium of about 15°C, which has been heat-exchanged in the condenser (13) and has a high temperature, is heat-exchanged with an external heat source in the common heat exchanger (60) and then increases to about 19°C and is then stored in the thermal intercooler (30). At this time, if the temperature of the external heat source is lower than the temperature of the heat medium discharged from the condenser (13), the common heat exchanger (60) does not operate.

[0095] 《Third Embodiment》

[0096] Figure 9 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to a third embodiment of the present invention.

[0097] Referring to FIG. 9, a dual intercooling system (1) capable of storing external heat and cold heat according to a third embodiment of the present invention is composed of a heat pump (10), a cold intercooling storage tank (20), a hot intercooling storage tank (30), a cold heat exchanger (40), and a hot heat exchanger (50).

[0098] First, the heat pump (10) produces heat in the condenser (13) in the winter and supplies it to heating users, and produces cold heat in the evaporator (11) in the summer and supplies it to cooling users.

[0099] And, the cold storage tank (20) supplies the cold stored in the summer to the condenser (13) by one of the borehole method (BTES), pit method (PTES), and tank method (TTES), exchanges heat, and then recovers and circulates the heat medium whose temperature has increased to the cold storage tank (20).

[0100] In addition, the thermal seasonal storage tank (30) supplies the thermal heat stored in the winter to the evaporator (11) by one of the borehole method (BTES), pit method (PTES), and tank method (TTES), exchanges the heat, and then recovers and circulates the heat medium whose temperature has been lowered to the thermal seasonal storage tank (30).

[0101] In addition, a cold heat exchanger (40) is installed between the heat pump (10) and the cold heat seasonal storage tank (20) to further lower the temperature by exchanging heat between an external cold heat source and the circulating heat medium of the cold heat seasonal storage tank (20) in the winter and store the lowered temperature in the cold heat seasonal storage tank (20). At this time, the cold heat exchanger (40) operates when the temperature of the external cold heat source is lower than the outlet temperature of the cold heat seasonal storage tank (20). In addition, new and renewable energy or unused energy is used as the external cold heat source.

[0102] In addition, a thermal heat exchanger (50) is installed between the heat pump (10) and the thermal seasonal storage tank (30) to exchange heat between an external thermal source and the circulating heat medium of the thermal seasonal storage tank (30) in the summer to further increase the temperature and store it in the thermal seasonal storage tank (30). At this time, the thermal heat exchanger (50) is operated when the temperature of the external thermal source is higher than the outlet temperature of the thermal seasonal storage tank (30). In addition, new and renewable energy or unused energy is used as the external thermal source.

[0103] In addition, a dual intercooling system (1) capable of storing external heat and cold heat according to a third embodiment of the present invention comprises a heat pump (10), a cold intercooling storage tank (20), a hot intercooling storage tank (30), a cold heat exchanger (40), and a hot heat exchanger (50), and a plurality of pumps (P) are provided between the heat pump (10), the cold intercooling storage tank (20), the hot intercooling storage tank (30), the cold heat exchanger (40), and the hot heat exchanger (50) to selectively operate according to the flow path, and a three-way valve (not shown) is provided at each connection point to change the flow path.

[0104] Hereinafter, the operation of a dual-stage heat storage system capable of storing external heat and cold according to a third embodiment of the present invention will be described in detail with reference to the attached drawings.

[0105] Figures 10 and 11 are explanatory diagrams for explaining the winter and summer operating states of a dual inter-seasonal heat storage system capable of storing external heat and cold according to a third embodiment of the present invention.

[0106] Winter

[0107] Referring to Fig. 10, heat of about 15°C or higher stored in the thermal storage tank (30) is supplied to the evaporator (11) of the heat pump (10), and heat produced in the condenser (13) is supplied to the heating user.

[0108] And, the heat medium whose temperature has been lowered through heat exchange in the evaporator (11) is returned to the thermal intercooler (30).

[0109] Meanwhile, the cold heat stored in the cold heat storage tank (20) at a temperature of less than about 15°C is circulated by the pump and exchanges heat with an external cold heat source in the cold heat heat exchanger (40), and then the temperature is further lowered and stored in the cold heat storage tank (20). At this time, if the temperature of the external cold heat source is higher than the outlet temperature of the cold heat storage tank (20), the cold heat exchanger (40) does not operate.

[0110] Summer

[0111] Referring to Fig. 11, cold heat of about 15°C or less stored in a cold heat storage tank (20) is supplied to a condenser (13) of a heat pump (10), and cold heat produced in an evaporator (11) is supplied to a cooling heat user.

[0112] And, the heat medium that has been heat-exchanged in the condenser (13) and has a high temperature returns to the cold storage tank (20).

[0113] Meanwhile, the heat stored in the thermal storage tank (30) at a temperature of about 15°C or higher is circulated by the pump and exchanged with an external heat source in the thermal heat exchanger (50), and then the temperature increases further and is stored in the thermal storage tank (30). At this time, if the external heat source is lower than the outlet temperature of the thermal storage tank (30), the thermal heat exchanger (50) does not operate.

[0114] 《Fourth Embodiment》

[0115] Fig. 12 is a schematic diagram showing the configuration of a dual-stage heat storage system capable of storing external heat and cold according to the fourth embodiment of the present invention.

[0116] Referring to FIG. 12, a dual intercooler storage system (1) capable of storing external heat and cold heat according to the fourth embodiment of the present invention is composed of a heat pump (10), a cold intercooler storage tank (20), a hot intercooler storage tank (30), and a common heat exchanger (60).

[0117] First, the heat pump (10) produces heat in the condenser (13) in the winter and supplies it to heating users, and produces cold heat in the evaporator (11) in the summer and supplies it to cooling users.

[0118] And, the cold storage tank (20) supplies the cold stored in the summer to the condenser (13) by one of the borehole method (BTES), pit method (PTES), and tank method (TTES), exchanges heat, and then recovers and circulates the heat medium whose temperature has increased to the cold storage tank (20).

[0119] In addition, the thermal seasonal storage tank (30) supplies the thermal heat stored in the winter to the evaporator (11) by one of the borehole method (BTES), pit method (PTES), and tank method (TTES), exchanges the heat, and then recovers and circulates the heat medium whose temperature has been lowered to the thermal seasonal storage tank (30).

[0120] In addition, a common heat exchanger (60) is installed between the heat pump (10) and the cold / hot seasonal storage tank (20, 30) to exchange heat between an external cold heat source and the circulating heat medium of the cold seasonal storage tank (20) in the winter to further lower the temperature and store it in the cold seasonal storage tank (20), and in the summer to further raise the temperature and store it in the hot seasonal storage tank (30) by heat-exchanging between an external hot heat source and the circulating heat medium of the hot seasonal storage tank (30). At this time, the common heat exchanger (60) is operated when the temperature of the external cold heat source is lower than the outlet temperature of the cold seasonal storage tank (20), and is operated when the temperature of the external hot heat source is higher than the outlet temperature of the hot seasonal storage tank (30). In addition, new and renewable energy or unused energy is used as the external hot heat source and the external cold heat source.

[0121] In addition, a dual intercooling system (1) capable of storing external heat and cold heat according to the fourth embodiment of the present invention is provided with a plurality of pumps (P) between a heat pump (10), a cold intercooling storage tank (20), a hot intercooling storage tank (30), and a common heat exchanger (60) to selectively operate according to a flow path, and a three-way valve (not shown) is provided at each connection point to change the flow path.

[0122] Hereinafter, the operation of a dual-stage heat storage system capable of storing external heat and cold according to a fourth embodiment of the present invention will be described in detail with reference to the attached drawings.

[0123] Figures 13 and 14 are explanatory diagrams for explaining the winter and summer operating states of a dual-season heat storage system capable of storing external heat and cold according to the fourth embodiment of the present invention.

[0124] Winter

[0125] Referring to Fig. 13, heat of about 15°C or higher stored in the thermal storage tank (30) is supplied to the evaporator (11) of the heat pump (10), and heat produced in the condenser (13) is supplied to the heating user.

[0126] And, the heat medium whose temperature has been lowered through heat exchange in the evaporator (11) is returned to the thermal intercooler (30).

[0127] Meanwhile, the cold heat stored in the cold heat storage tank (20) at a temperature of less than about 15°C is circulated by the pump and exchanged with an external cold heat source in the common heat exchanger (60), and then the temperature is further lowered and stored in the cold heat storage tank (20). At this time, if the temperature of the external cold heat source is higher than the outlet temperature of the cold heat storage tank (20), the common heat exchanger (60) does not operate.

[0128] Summer

[0129] Referring to Fig. 14, cold heat of about 15°C or less stored in the cold heat storage tank (20) is supplied to the condenser (13) of the heat pump (10), and cold heat produced in the evaporator (11) is supplied to the cooling heat user.

[0130] And, the heat medium that has been heat-exchanged in the condenser (13) and has a high temperature returns to the cold storage tank (20).

[0131] Meanwhile, the heat stored in the thermal storage tank (30) at a temperature of about 15°C or higher is circulated by the pump and exchanged with an external heat source in the common heat exchanger (60), and then the temperature increases further and is stored in the thermal storage tank (30). At this time, if the external heat source is lower than the outlet temperature of the thermal storage tank (30), the common heat exchanger (60) does not operate.

[0132] The present invention is capable of various modifications and takes many forms, and the detailed description of the invention has described only specific embodiments thereof. However, it should be understood that the present invention is not limited to the specific forms described in the detailed description, but rather encompasses all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

[0133] <Explanation of symbols>

[0134] 10: Heat pump 20: Cold and hot storage tank

[0135] 30: Heating intermittent heat storage tank 40: Cold heat exchanger

[0136] 50: Thermal heat exchanger 60: Common heat exchanger

Claims

1. Heat pump and; A cold storage tank of an aquifer type (ATES) that stores cold heat produced in the evaporator of the heat pump or supplies cold heat stored in the condenser of the heat pump; An aquifer type (ATES) thermal storage tank that stores the thermal heat produced in the condenser of the heat pump or supplies the thermal heat stored in the evaporator of the heat pump; A cold heat exchanger that exchanges heat between an external cold heat source and a heat medium discharged from the evaporator of the heat pump to lower the temperature and store it in the cold heat storage tank; and A dual intercooling system capable of storing external heat and cold, characterized by comprising a heat exchanger that increases the temperature by exchanging heat between an external heat source and a heat medium discharged from a condenser of the heat pump and stores the temperature in the intercooling storage tank.

2. In paragraph 1, The dual-stage heat storage system capable of storing external heat and cold is In winter, the heat medium stored in the above-mentioned thermal storage tank is first cooled down through the evaporator of the above-mentioned heat pump, and then, when the temperature of the external cold source is lower than the discharge temperature of the evaporator, the temperature is cooled down again by the cold heat absorbed by the above-mentioned cold heat exchanger and injected into the above-mentioned cold heat storage tank, and the above-mentioned heat is produced in the condenser of the above-mentioned heat pump. A dual seasonal storage system capable of storing external heat and cold, characterized in that the heat medium stored in the above-mentioned cold seasonal storage tank is first heated through the condenser of the above-mentioned heat pump during the summer season, and then, when the temperature of the external heat source is higher than the discharge temperature of the condenser, is reheated with heat absorbed by the above-mentioned hot heat exchanger and injected into the above-mentioned hot seasonal storage tank, and cold heat is produced in the evaporator of the above-mentioned heat pump.

3. Heat pump and; A cold storage tank of an aquifer type (ATES) that stores cold heat produced in the evaporator of the heat pump or supplies cold heat stored in the condenser of the heat pump; An aquifer type (ATES) thermal interstitial storage tank that supplies heat to the evaporator of the above heat pump or stores the heat produced by the condenser; and A dual inter-seasonal heat storage system capable of storing external hot and cold heat, characterized by comprising a common heat exchanger that exchanges heat between an external cold heat source and a heat medium discharged from an evaporator of the heat pump to lower the temperature and store it in the cold inter-seasonal heat storage tank, or exchanges heat between an external hot heat source and a heat medium discharged from a condenser of the heat pump to raise the temperature and store it in the hot inter-seasonal heat storage tank.

4. In paragraph 3, The dual-stage heat storage system capable of storing external heat and cold is In winter, the heat medium stored in the above-mentioned thermal seasonal storage tank is first cooled down through the evaporator of the above-mentioned heat pump, and then, when the temperature of the external cold source is lower than the discharge temperature of the evaporator, the temperature is cooled down again by the cold heat absorbed by the above-mentioned common heat exchanger and injected into the above-mentioned cold seasonal storage tank, and heat is produced in the condenser of the above-mentioned heat pump. A dual seasonal storage system capable of storing external heat and cold, characterized in that the heat medium stored in the above-mentioned cold seasonal storage tank is first heated through the condenser of the above-mentioned heat pump during the summer season, and then, when the temperature of the external heat source is higher than the discharge temperature of the condenser, is reheated with heat absorbed from the above-mentioned common heat exchanger and injected into the above-mentioned hot seasonal storage tank, and cold heat is produced in the evaporator of the above-mentioned heat pump.

5. Heat pump and; A cold storage tank that absorbs heat emitted from a condenser of the above heat pump and follows one of the borehole method (BTES), pit method (PTES), and tank method (TTES); A thermal storage tank that supplies heat to the evaporator of the above heat pump and follows any one of the borehole method (BTES), pit method (PTES), and tank method (TTES); A cold heat exchanger that exchanges heat with an external cold heat source and a circulating heat medium to lower the temperature and store it in the cold heat storage tank; and A dual intercooling system capable of storing external heat and cold heat, characterized by comprising a heat exchanger that increases the temperature by exchanging heat with an external heat source and a circulating heat medium and stores the temperature in the intercooling heat storage tank.

6. In paragraph 5, The dual-stage heat storage system capable of storing external heat and cold is In winter, heat is supplied to the evaporator of the heat pump from the above-mentioned hot seasonal storage tank to produce heating heat in the condenser, and when the temperature of the external cold source is lower than the outlet temperature of the above-mentioned cold seasonal storage tank, the cold heat absorbed from the cold heat exchanger is stored in the above-mentioned cold seasonal storage tank. A dual seasonal storage system capable of storing external heat and cold heat, characterized in that in the summer, the heat emitted from the condenser of the heat pump is absorbed in the cold seasonal storage tank to produce cooling heat in the evaporator, and when the temperature of the external heat source is higher than the outlet temperature of the hot seasonal storage tank, the heat absorbed from the hot heat exchanger is stored in the hot seasonal storage tank.

7. Heat pump and; A cold storage tank that absorbs heat emitted from a condenser of the above heat pump and follows one of the borehole method (BTES), pit method (PTES), and tank method (TTES); A thermal intercooler that supplies heat to the evaporator of the above heat pump and follows any one of the borehole method (BTES), pit method (PTES), and tank method (TTES); and A dual inter-seasonal heat storage system capable of storing external heat and cold heat, characterized by comprising a common heat exchanger that exchanges heat with an external cold heat source and a circulating heat medium to lower the temperature and store it in the cold inter-seasonal heat storage tank, or exchanges heat with an external hot heat source and a circulating heat medium to raise the temperature and store it in the hot inter-seasonal heat storage tank.

8. In paragraph 7, The dual-stage heat storage system capable of storing external heat and cold is In winter, heat is supplied to the evaporator of the heat pump from the above-mentioned hot seasonal storage tank to produce heating heat in the condenser, and when the temperature of the external cold source is lower than the outlet temperature of the above-mentioned cold seasonal storage tank, the cold heat absorbed from the above-mentioned common heat exchanger is stored in the above-mentioned cold seasonal storage tank. A dual seasonal storage system capable of storing external heat and cold, characterized in that in the summer, the heat emitted from the condenser of the heat pump is absorbed in the cold seasonal storage tank to produce cooling heat in the evaporator, and when the temperature of the external cold heat source is higher than the outlet temperature of the hot seasonal storage tank, the heat absorbed from the common heat exchanger is stored in the hot seasonal storage tank.

9. In any one of paragraph 1, paragraph 3, paragraph 5 or paragraph 7, The above external heat and cold sources are, A dual-temperature storage system capable of storing external heat and cold, characterized by new / renewable energy or unused energy.

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