CN108895587B - Series-parallel connection heat pump double-storage energy supply system - Google Patents
Series-parallel connection heat pump double-storage energy supply system Download PDFInfo
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- CN108895587B CN108895587B CN201810918937.5A CN201810918937A CN108895587B CN 108895587 B CN108895587 B CN 108895587B CN 201810918937 A CN201810918937 A CN 201810918937A CN 108895587 B CN108895587 B CN 108895587B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention discloses a series-parallel heat pump double-storage energy supply system, which fully utilizes the night off-peak electricity all the year round, can effectively reduce the installed load of a power grid, reduce the power consumption load of an air conditioner in the peak period of the power grid and relieve the power supply pressure of an electric power department; the peak-valley electricity price difference is utilized, so that the running cost of the air conditioner is greatly reduced; the same set of equipment is adopted for cold accumulation or heat accumulation, and the aim of economic and efficient operation is achieved through different combination modes. In addition, the chilled water temperature can be reduced to about 1-4 ℃ by adopting ice cold accumulation and water cold accumulation, and the chilled water temperature is combined with a low-temperature air supply system, so that large temperature difference heat transfer can be realized, the cost is reduced, better economic benefits are obtained, the relative humidity of indoor air can be reduced, and the comfort degree of an air-conditioning room can be improved.
Description
Technical Field
The invention relates to an energy supply system, in particular to an energy supply system for realizing summer cold accumulation and winter heat accumulation through series-parallel heat pumps.
Background
The total annual power consumption of the air conditioner in China exceeds 400 hundred million kilowatt-hours at present, and the value is further increased along with the continuous promotion of urban intake and the increasing of living standard of residents, so that the air conditioner has become an energy consumption consumer. In summer, especially in the south, the power consumption of some urban air conditioners accounts for 30-40% of the urban power consumption. Although the electric power industry of China rapidly develops, the installed capacity of power generation of China is first in the world, and a certain contradiction still exists between the supply and demand of electric power of China. The power consumption has obvious timeliness, namely, the daytime is the peak period of the power consumption load, and the night is the valley period of the power consumption load. In order to meet the power supply, the installed load of the power generation department must meet the requirements of the power load at the peak of high-temperature weather in summer, and only a part of the power is used at the low valley period of night power consumption, so that a great amount of power is wasted. In order to relieve the problems of tension and deficiency of electricity, the country encourages peak-to-peak electricity utilization, and goes out of the peak-to-valley electricity price policy, and the hot tide of domestic energy storage technology research is started. At present, more attention and research are paid to transferring summer electricity load by adopting an ice cold accumulation technology in China, and less attention is paid to utilizing a valley electricity heat accumulation technology in winter. In order to fully utilize the night off-peak electricity all the year round and further promote the development of domestic energy storage technology, the cold and hot double-storage technology is necessary to be developed.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a series-parallel heat pump double-storage energy supply system, which can realize cold storage or heat storage in the electricity consumption low-peak period by connecting heat pump units in series or in parallel, and release cold or heat in the electricity consumption peak period, thereby greatly reducing the load of a power grid and the electricity consumption cost of users.
The technical scheme provided by the invention is as follows:
a series-parallel heat pump cold-hot double-storage energy supply system comprises a double-working-condition refrigerating/heating unit, a first electromagnetic valve, a first three-way valve, an ice coil pipe ice storage device, a glycol solution tank, a glycol pump, a second electromagnetic valve, a second three-way valve, a chilled water pump, a plate heat exchanger, a tail water supply end, a tail water return end, a third electromagnetic valve, a water pump, a water source heat pump unit, a third three-way valve, a cold/heat storage water tank and a fourth electromagnetic valve, wherein the double-working-condition refrigerating/heating unit, the first electromagnetic valve, the first three-way valve, the ice coil pipe ice storage device, the glycol solution tank and the glycol pump form an ice cold storage loop, the water source heat pump unit, the third three-way valve and the cold/heat storage water tank form a water cold storage/heat storage loop, the second electromagnetic valve, the second three-way valve, the chilled water pump, the plate heat exchanger, the tail water supply end, the tail water return end and the fourth electromagnetic valve form a cold/heat release loop,
the system operates in the following modes:
1) In the period of night valley electricity in summer, the system operates in a cold accumulation mode, and the mode is divided into an ice-only cold accumulation mode, a water-only cold accumulation mode and an ice water double-accumulation mode,
when the double-working-condition refrigerating/heating unit is opened, the electromagnetic valve I is opened, the three-way valve I is adjusted to be in an AB direction, the ethylene glycol pump is opened, and other devices are in a closed state, namely an ice storage mode only, in the mode, ethylene glycol enters an evaporator of the double-working-condition refrigerating/heating unit to exchange heat under the action of the ethylene glycol pump, the obtained cold ethylene glycol exchanges heat with water in the ice coil ice storage device to release cold, then enters an ethylene glycol solution tank to complete circulation, and enters the next circulation period, and the water in the ice coil ice storage device obtains the cold released by the ethylene glycol and then prepares ice cubes outside the coil;
when the water source heat pump unit is started, the three-way valve is regulated to be in the AB direction, and other devices are in a closed state, the water only cold storage mode is adopted, and the water source heat pump unit is used for preparing low-temperature water and storing the low-temperature water in the cold/heat storage water tank in the mode;
when the electromagnetic valve III is closed and the water pump is closed, the other device states are the ice cold storage mode and the water cold storage mode, namely the ice water double-storage mode, and in the mode, the double-station refrigerating/heating unit and the water source heat pump unit are in a parallel working state, and the ice cold storage working mode and the water cold storage working mode are respectively operated;
2) In the peak electricity period in the daytime in summer, the system operates in a cooling mode, and the mode is divided into a mode of only melting ice and cooling, only low-temperature water and cooling, simultaneously releasing ice water and cooling and a double-working-condition refrigerating/heating unit cooling mode,
when the electromagnetic valve II is opened, the three-way valve II is adjusted to be in the AB direction, the chilled water pump is started, and other devices are in a closed state, namely an ice melting and cooling releasing mode only, in which the return water at the tail end returns water and the plate heat exchanger exchange heat and then enter the ice coil ice storage device to melt ice and cool to obtain low-temperature chilled water, and the low-temperature chilled water is supplied to the tail end water supply end under the action of the chilled water pump;
when the electromagnetic valve III is opened and the water pump is opened, the other devices are in a closed state, namely a low-temperature water cooling mode, and the low-temperature water stored in the cold/heat storage water tank in the mode supplies cold to the tail end water supply end under the action of the water pump;
when the second electromagnetic valve is opened, the second three-way valve is adjusted to be in the AB direction, the fourth electromagnetic valve is opened, the chilled water pump is in an opened state, and other devices are in a closed state, the system is in an ice water cooling state at the same time;
when the ice water is released simultaneously and the terminal cooling requirement can not be met, the double-station refrigerating/heating unit is started, meanwhile, the first electromagnetic valve is started, the first three-way valve is adjusted to be in an AC direction, and the second three-way valve is adjusted to be in a CB direction, so that the defect of cooling load is overcome;
3) During winter night off-peak electricity period
In the period of night off-peak electricity in winter, the system operates in a heat storage mode, in particular a water heat storage mode,
when the double-working-condition refrigerating/heating unit is started, the electromagnetic valve is started, the water pump is started, the water source heat pump unit is started, the three-way valve is regulated to be in the AB direction, the electromagnetic valve is closed, and other devices are in a closed state, namely a water heat storage mode;
4) The system operates in a heat release mode in the daytime electricity consumption peak period in winter, and the mode can be divided into a cold accumulation/heat accumulation water tank heat release mode and a unit heat supply mode,
when the electromagnetic valve is opened, the chilled water pump is opened, and other devices are in a closed state, the mode is a cold accumulation/heat accumulation water tank heat release mode, and in the mode, the hot water accumulated by night off-peak electricity is used for releasing heat preferentially, so that the heat supply requirement of the tail end water supply end is met;
when the heat release of the cold/heat storage water tank can not meet the tail end heat load demand, the double-station refrigerating/heating unit and the water source heat pump unit are started, meanwhile, the electromagnetic valve III is started, the water pump and the three-way valve III are adjusted to be in the AC direction, the three-way valve I is adjusted to be in the AC direction, the three-way valve II is adjusted to be in the CB direction, and the water pump is started, so that the tail end water supply end residual heat load demand is supplemented.
A series-parallel heat pump cold-hot double-storage energy supply system comprises a double-working-condition refrigerating/heating unit, a first electromagnetic valve, a first three-way valve, an ice coil pipe ice storage device, a glycol solution tank, a glycol pump, a second electromagnetic valve, a second three-way valve, a chilled water pump, a plate heat exchanger, a tail water supply end, a tail water return end, a third electromagnetic valve, a water pump, a ground source heat pump unit, a third three-way valve, a cold/heat storage water tank, a fourth electromagnetic valve, a subcooler, a circulating water pump and a supercooling degree relieving device, wherein the double-working-condition refrigerating/heating unit, the first electromagnetic valve, the first three-way valve, the ice coil pipe ice storage device, the glycol solution tank, the glycol pump, the supercooling device, the circulating water pump and the supercooling degree relieving device form a supercooling water ice storage loop, the ground source heat pump unit, the third three-way valve, the cold/heat storage water tank form a water storage/heating loop, the second electromagnetic valve, the second three-way valve, the chilled water pump, the plate heat exchanger, the tail water supply end, the tail water return end and the fourth electromagnetic valve form a cold/heat release loop,
the system operates in the following modes:
1) In the period of night valley electricity in summer, the system operates in a cold accumulation mode, and the mode is divided into an ice-only cold accumulation mode, a water-only cold accumulation mode and an ice water double-accumulation mode,
when the double-working-condition refrigerating/heating unit is opened, the electromagnetic valve I is opened, the three-way valve I is adjusted to be in the AB direction, the glycol pump and the circulating water pump are opened, and other devices are in the closed state, namely the ice cold storage mode only, in the mode, glycol enters an evaporator of the double-working-condition refrigerating/heating unit to exchange heat under the action of the glycol pump, the glycol with obtained cold quantity enters a glycol solution tank to complete circulation after exchanging heat with water in the ice coil ice storage device in the supercooler to release the cold quantity, the water in the ice coil ice storage device is subjected to the formation of supercooled water to form ice slurry under the action of the supercooling release device, the ice slurry is stored in the ice coil ice storage device,
when the ground source heat pump unit is started, the three-way valve is regulated to be in the AB direction, and other devices are in a closed state, namely a water-only cold storage mode, the ground source heat pump unit is used for preparing low-temperature water in the mode and storing the low-temperature water in a cold/heat storage water tank;
when the electromagnetic valve III is closed and the water pump is closed, the other device states are the ice cold storage mode and the water cold storage mode, namely the ice water double-storage mode, and in the mode, the double-station refrigerating/heating unit and the ground source heat pump unit are in a parallel working state, and the ice cold storage working mode and the water cold storage working mode are respectively operated;
2) In the peak electricity period in the daytime in summer, the system operates in a cooling mode, and the mode is divided into a mode of only melting ice and cooling, only low-temperature water and cooling, simultaneously releasing ice water and cooling and a double-working-condition refrigerating/heating unit cooling mode,
when the electromagnetic valve II is opened, the three-way valve II is adjusted to be in the AB direction, the chilled water pump is started, and other devices are in a closed state, namely an ice melting and cooling releasing mode only, in which the return water at the tail end returns water and the plate heat exchanger exchange heat and then enter the ice coil ice storage device to melt ice and cool to obtain low-temperature chilled water, and the low-temperature chilled water is supplied to the tail end water supply end under the action of the chilled water pump;
when the electromagnetic valve is opened, the water pump is opened, and other devices are in a closed state, namely a low-temperature water cooling mode, the low-temperature water stored in the cold/heat storage water tank in the mode supplies cold to the tail end water supply end under the action of the water pump;
when the second electromagnetic valve is opened, the second three-way valve is adjusted to be in the AB direction, the fourth electromagnetic valve is opened, the chilled water pump is in an opened state, and other devices are in a closed state, the system is in an ice water cooling state at the same time;
when the ice water is released simultaneously and the terminal cooling requirement can not be met, the double-station refrigerating/heating unit is started, meanwhile, the first electromagnetic valve is started, the first three-way valve is adjusted to be in an AC direction, and the second three-way valve is adjusted to be in a CB direction, so that the defect of cooling load is overcome;
3) During winter night off-peak electricity period
In the period of night off-peak electricity in winter, the system operates in a heat storage mode, in particular a water heat storage mode,
when the double-working-condition refrigerating/heating unit is started, the electromagnetic valve is started, the water pump is started, the ground source heat pump unit is started, the three-way valve is regulated to be in the AB direction, the electromagnetic valve is closed, and other devices are in a closed state, namely a water heat storage mode;
4) The system operates in a heat release mode in the daytime electricity consumption peak period in winter, and the mode can be divided into a cold accumulation/heat accumulation water tank heat release mode and a unit heat supply mode;
when the electromagnetic valve is opened for four times and the chilled water pump is opened, the rest devices are in a closed state, namely the heat release mode of the cold/heat storage water tank, in the mode, the hot water stored by the night low-valley electric power is utilized to release heat preferentially, the heat supply requirement of the tail end water supply end is met,
when the heat release of the cold/heat storage water tank can not meet the tail end heat load demand, the double-station refrigerating/heating unit and the ground source heat pump unit are started, meanwhile, the electromagnetic valve III is started, the water pump and the three-way valve III are adjusted to be AC, the three-way valve I is adjusted to be AC, the three-way valve II is adjusted to be CB, and the water pump is started, so that the tail end water supply end residual heat load demand is supplemented.
The beneficial effects of the invention are as follows: the night off-peak electricity is fully utilized all the year round, the installed load of the power grid can be effectively reduced, the electricity consumption load of the air conditioner in the peak period of the power grid is reduced, and the power supply pressure of the power department is relieved; the peak-valley electricity price difference is utilized, so that the running cost of the air conditioner is greatly reduced; the same set of equipment is adopted for cold accumulation or heat accumulation, and the aim of economic and efficient operation is achieved through different combination modes. In addition, the chilled water temperature can be reduced to about 1-4 ℃ by adopting ice cold accumulation and water cold accumulation, and the chilled water temperature is combined with a low-temperature air supply system, so that large temperature difference heat transfer can be realized, the cost is reduced, better economic benefits are obtained, the relative humidity of indoor air can be reduced, and the comfort degree of an air-conditioning room can be improved.
Drawings
Fig. 1 is a schematic flow chart of a first embodiment of the present invention.
Fig. 2 is a schematic flow chart of a second embodiment of the present invention.
Detailed Description
The features and operation strategies of the present invention are described in further detail below by way of example with reference to the accompanying drawings:
as shown in the drawings, reference numerals respectively denote: the double-working-condition refrigerating/heating unit 1, a first electromagnetic valve 2, a first three-way valve 3, an ice coil ice storage device 4, an ethylene glycol solution tank 5, an ethylene glycol pump 6, a second electromagnetic valve 7, a second three-way valve 8, a chilled water pump 9, a plate heat exchanger 10, a terminal water supply end 11, a terminal water return end 12, a third electromagnetic valve 13, a water pump 14, a water source heat pump unit 15, a third three-way valve 16, a cold/heat storage water tank 17, a fourth electromagnetic valve 18, a subcooler 19, a circulating water pump 20, a subcooling degree relieving device 21 and a ground source heat pump unit 22.
Embodiment one:
the cold source adopts ice-melting outside the ice coil and a water source heat pump, and the heat source is the water source heat pump.
The series-parallel heat pump cold and hot double-storage energy supply system comprises a double-working-condition refrigerating/heating unit 1, a first electromagnetic valve 2, a first three-way valve 3, an ice coil pipe ice storage device 4, an ethylene glycol solution tank 5, an ethylene glycol pump 6, a second electromagnetic valve 7, a second three-way valve 8, a chilled water pump 9, a plate heat exchanger 10, a terminal water supply end 11, a terminal water return end 12, a third electromagnetic valve 13, a water pump 14, a water source heat pump unit 15, a third three-way valve 16, a cold/heat storage water tank 17 and a fourth electromagnetic valve 18, and is characterized in that the double-working-condition refrigerating/heating unit 1, the first electromagnetic valve 2, the first three-way valve 3, the ice coil pipe ice storage device 4, the ethylene glycol solution tank 5 and the ethylene glycol pump 6 form an ice storage loop, the water heat pump unit 15, the third three-way valve 16 and the cold/heat storage water tank 17 form a water cold/heat storage loop, the second electromagnetic valve 7, the second three-way valve 8, the chilled water pump 9, the plate heat exchanger 10, the terminal water supply end 11, the terminal water return end 12 and the fourth electromagnetic valve 18 form a cold/heat release loop.
When the embodiment is used, the system operates in the following modes:
1. in the period of night off-peak electricity in summer, the system operates in a cold accumulation mode, and the cold accumulation mode can be divided into an ice cold accumulation mode only, a water cold accumulation mode and an ice water double accumulation mode.
When the double-working-condition refrigerating/heating unit 1 is started, the electromagnetic valve I2 is started, the three-way valve I3 is adjusted to be in the AB direction, the glycol pump 6 is started, and the rest devices are in the closed state, namely the ice cold storage mode only. Under the action of the glycol pump 6, the glycol enters an evaporator of a double-station refrigerating/heating unit to exchange heat, and the glycol with obtained cold energy enters a glycol solution tank to complete circulation after exchanging heat with water in the ice coil ice storage device 4 to release the cold energy, and enters the next circulation period. And the water in the ice coil pipe ice storage device obtains the cooling capacity released by glycol and then makes ice blocks outside the coil pipe.
When the water source heat pump unit 15 is opened, the three-way valve 16 is regulated to be in the AB direction, and the other devices are in the closed state, the water-only cold accumulation mode is realized. In this mode, low-temperature water is produced by the water source heat pump unit and stored in the cold/heat storage water tank 17.
When the electromagnetic valve III 13 is closed and the water pump 14 is closed, the states of other devices are the same as the ice-only cold accumulation mode and the water-only cold accumulation mode, namely the ice water double accumulation mode. In the mode, the double-station refrigeration/heat engine unit 1 and the water source heat pump unit 15 are in a parallel working state, and respectively run an ice cold storage working mode and a water cold storage working mode.
2. In the peak electricity period in the daytime in summer, the system operates in a cooling mode, and the cooling mode can be divided into a cooling mode of only melting ice and cooling, a cooling mode of only low-temperature water and cooling, a cooling mode of both ice water and cooling and a cooling mode of the double-station refrigerating/heating unit 1.
When the electromagnetic valve II 7 is opened, the three-way valve II 8 is adjusted to be in the AB direction, the chilled water pump 9 is opened, and the rest devices are in the closed state, the ice melting and cooling mode is only realized. In the mode, the backwater of the tail end backwater end 12 exchanges heat with the plate heat exchanger 10, and then enters the ice coil ice storage device 4 to melt ice and release cold to obtain low-temperature chilled water, and the low-temperature chilled water is supplied to the tail end water supply end 11 under the action of the chilled water pump 9.
When the electromagnetic valve IV 18 is opened and the chilled water pump 9 is opened, the rest devices are in a closed state, namely a low-temperature water cooling mode. The low-temperature water stored in the cold/heat storage water tank 17 in this mode is supplied to the terminal water supply end 11 by the chilled water pump 9.
When the second electromagnetic valve 7 is opened, the three-way valve 8 is adjusted to be in the AB direction, the chilled water pump 9 is opened, the fourth electromagnetic valve 18 is opened, the chilled water pump 9 is in an opened state, and other devices are in a closed state, the system is in an ice water simultaneous cooling releasing state.
When the ice water releases cold simultaneously and the terminal cooling requirement can not be met, the double-station refrigerating/heating unit 1 is started, meanwhile, the first electromagnetic valve 2 is started, the first three-way valve 3 is adjusted to be in the AC direction, and the second three-way valve 8 is adjusted to be in the CB direction, so that the defect of cooling load is overcome.
To clearly illustrate the operating conditions of the valves in each mode of the system, it is now set forth in Table 1.
TABLE 1 valve control Meter
3. During winter night off-peak electricity period
In the night off-peak electricity period in winter, the system operates in a heat storage mode, particularly a water heat storage mode.
When the water chilling unit 1 is opened, the electromagnetic valve III 13 is opened, the water source heat pump unit 15 is opened, the three-way valve III 16 is adjusted to be in the AB direction, the electromagnetic valve IV 18 is closed, and the rest devices are in the closed state, the water heat storage mode is obtained. In the mode, the double-station refrigerating/heating unit 1 prepares low-temperature hot water at about 20 ℃, the low-temperature hot water at about 20 ℃ enters the water source heat pump unit 15 to be lifted to high-temperature hot water at about 60 ℃ under the action of the water pump 14, and the high-temperature hot water is stored in the cold storage/heat storage water tank.
4. The system operates in a heat release mode in the daytime electricity consumption peak period in winter, and the mode can be divided into a cold accumulation/heat accumulation water tank heat release mode and a unit heat supply mode.
When the solenoid valve IV 18 is opened and the chilled water pump 9 is opened, the rest devices are in a closed state, namely the cold/heat storage water tank heat release mode. In this mode, the hot water stored by the night off-peak electricity is used to release heat preferentially, so as to meet the heat supply requirement of the tail water supply end 11.
When the heat released by the cold/heat storage water tank 17 can not meet the tail end heat load demand, the water chilling unit 1 and the water source heat pump unit are started, meanwhile, the electromagnetic valve III 13 is started, the water pump 14 and the three-way valve III 16 are adjusted to be AC, the three-way valve I3 is adjusted to be AC, the three-way valve II 8 is adjusted to be CB, the chilled water pump 9 is started, and the residual heat load demand of the tail end water supply end 11 is supplemented.
To clearly illustrate the operating conditions of the valves in each mode of the system, it is now set forth in Table 2.
Table 2 valve control table
Embodiment two:
the cold source adopts a supercooled water dynamic ice making device and a ground source heat pump, and the heat source adopts the ground source heat pump.
The series-parallel heat pump cold and hot double-storage energy supply system of the embodiment comprises a double-working condition refrigerating/heating unit 1, a first electromagnetic valve 2, a first three-way valve 3, an ice coil ice storage device 4, an ethylene glycol solution tank 5, an ethylene glycol pump 6, a second electromagnetic valve 7, a second three-way valve 8, a chilled water pump 9, a plate heat exchanger 10, a tail water supply end 11, a tail water return end 12, a third electromagnetic valve 13, a water pump 14, a ground source heat pump unit 22, a third three-way valve 16, a cold/heat storage water tank 17 and a fourth electromagnetic valve 18, a subcooler 19, a circulating water pump 20 and a supercooling degree relieving device 21, wherein the double-working condition refrigerating/heating unit 1, the first electromagnetic valve 2, the first three-way valve 3, the ice coil ice storage device 4, the ethylene glycol solution tank 5, the ethylene glycol pump 6, the subcooler 19, the circulating water pump 20 and the supercooling degree relieving device 21 form a supercooling water ice storage circuit, the ground source heat pump unit 22, the third electromagnetic valve 16 and the heat storage water tank 17 form a water/heat storage circuit, the second electromagnetic valve 7, the second three-way valve 8, the water pump 9, the plate heat exchanger 10, the tail water supply end 11 and the tail water return end 12 and the fourth electromagnetic valve 18 form a cold/hot water releasing circuit.
When the embodiment is used, the system operates in the following modes:
1. in the period of night off-peak electricity in summer, the system operates in a cold accumulation mode, and the cold accumulation mode can be divided into an ice cold accumulation mode only, a water cold accumulation mode and an ice water double accumulation mode.
When the double-working-condition refrigerating/heating unit 1 is started, the first electromagnetic valve 2 is started, the first three-way valve 3 is adjusted to be in the AB direction, the glycol pump 6 and the circulating water pump 20 are started, and the rest devices are in the closed state, namely the ice cold storage mode only. In the mode, the glycol enters an evaporator of a double-station refrigerating/heating unit to exchange heat under the action of a glycol pump 6, and the glycol with obtained cold energy exchanges heat with water in an ice coil ice storage device 4 in a supercooler 19 to release the cold energy, then enters a glycol solution tank to complete circulation, and enters the next circulation period. The water in the ice-storage device of the ice coil pipe obtains the cold energy released by glycol to form supercooled water, and then forms ice slurry under the action of the supercooling degree relieving device 21, and the ice slurry is stored in the ice-storage device 4 of the ice coil pipe.
When the ground source heat pump unit 22 is opened, the three-way valve 16 is regulated to be in the AB direction, and the rest devices are in the closed state, the water cold accumulation mode is realized. In this mode, low-temperature water is produced by the ground source heat pump unit and stored in the cold/heat storage water tank 17.
When the electromagnetic valve III 13 is closed and the water pump 14 is closed, the states of other devices are the same as the ice-only cold accumulation mode and the water-only cold accumulation mode, namely the ice water double accumulation mode. In this mode, the dual-station refrigeration/heating unit 1 and the ground source heat pump unit 22 are in parallel operation, and respectively operate in the ice storage and water storage modes.
2. In the peak electricity period in the daytime in summer, the system operates in a cooling mode, and the cooling mode can be divided into a cooling mode of only melting ice and cooling, a cooling mode of only low-temperature water and cooling, a cooling mode of both ice water and cooling and a cooling mode of the double-station refrigerating/heating unit 1.
When the electromagnetic valve II 7 is opened, the three-way valve II 8 is adjusted to be in the AB direction, the chilled water pump 9 is opened, and the rest devices are in the closed state, the ice melting and cooling mode is only realized. In the mode, the backwater of the tail end backwater end 12 exchanges heat with the plate heat exchanger 10, and then enters the ice coil ice storage device 4 to melt ice and release cold to obtain low-temperature chilled water, and the low-temperature chilled water is supplied to the tail end water supply end 11 under the action of the chilled water pump 9.
When the electromagnetic valve IV 18 is opened and the chilled water pump 9 is opened, the rest devices are in a closed state, namely a low-temperature water cooling mode. The low-temperature water stored in the cold/heat storage water tank 17 in this mode is supplied to the terminal water supply end 11 by the chilled water pump 9.
When the second electromagnetic valve 7 is opened, the three-way valve 8 is adjusted to be in the AB direction, the chilled water pump 9 is opened, the fourth electromagnetic valve 18 is opened, the chilled water pump 9 is in an opened state, and other devices are in a closed state, the system is in an ice water simultaneous cooling releasing state.
When the ice water releases cold simultaneously and the terminal cooling requirement can not be met, the double-station refrigerating/heating unit 1 is started, meanwhile, the first electromagnetic valve 2 is started, the first three-way valve 3 is adjusted to be in the AC direction, and the second three-way valve 8 is adjusted to be in the CB direction, so that the defect of cooling load is overcome. The operating conditions of the valve in the different modes are as in table 1.
3. During winter night off-peak electricity period
In the night off-peak electricity period in winter, the system operates in a heat storage mode, particularly a water heat storage mode.
When the double-working-condition refrigerating/heating unit 1 is opened, the electromagnetic valve III 13 is opened, the ground source heat pump unit 22 is opened, the three-way valve III 16 is adjusted to be in the AB direction, the electromagnetic valve IV 18 is closed, and the rest devices are in the closed state, the water heat storage mode is obtained. In the mode, the double-station refrigerating/heating unit 1 prepares low-temperature hot water at about 20 ℃, the low-temperature hot water at about 20 ℃ enters the high-temperature hot water of which the ground source heat pump unit 22 is lifted to about 60 ℃ under the action of the water pump 14, and the high-temperature hot water is stored in the cold storage/heat storage water tank.
4. The system operates in a heat release mode in the daytime electricity consumption peak period in winter, and the mode can be divided into a cold accumulation/heat accumulation water tank heat release mode and a unit heat supply mode.
When the solenoid valve IV 18 is opened and the chilled water pump 9 is opened, the rest devices are in a closed state, namely the cold/heat storage water tank heat release mode. In this mode, the hot water stored by the night off-peak electricity is used to release heat preferentially, so as to meet the heat supply requirement of the tail water supply end 11.
When the heat released by the cold/heat storage water tank 17 can not meet the end heat load demand, the double-station refrigerating/heating unit 1 and the ground source heat pump unit 22 are started, meanwhile, the electromagnetic valve III 13 is started, the water pump 14 and the three-way valve III 16 are adjusted to be AC, the three-way valve I3 is adjusted to be AC, the three-way valve II 8 is adjusted to be CB, and the chilled water pump 9 is started, so that the residual heat load demand of the end water supply end 11 is supplemented. The operating conditions of the valve in the different modes are as in table 2.
The ice storage energy storage technology is that the existing peak-valley electricity price difference in China is utilized, the low-cost night electricity is stored in ice through a refrigerating unit, the cold is released by back-water ice melting of an end air conditioner in the period of electricity consumption peak or peak, the cold load requirement of an end user is met, the installation cost is reduced, the peak-valley electricity cutting and filling is realized, the power grid load is balanced, and a large amount of running cost can be saved for the user. Furthermore, the ice cold-storage low-temperature chilled water can be combined with the air supply system, so that the relative humidity of indoor air can be reduced, and the comfort level of an air-conditioning room can be improved, thereby having good social and economic benefits.
The water source heat pump or the ground source heat pump technology exchanges heat between heat pump equipment and renewable resources such as surface water, underground water, sewage (reclaimed water) or soil, so that primary energy consumption is greatly reduced, the full utilization of the pertaining resources is realized, the energy structure is optimized, the water resources are not consumed, the pollution is not caused, the environment is protected, and the technology is an energy-saving technology which is currently being promoted greatly.
Claims (2)
1. The series-parallel connection heat pump cold and hot double-storage energy supply system is characterized by comprising a double-working-condition refrigeration/heat engine group (1), a first electromagnetic valve (2), a first three-way valve (3), an ice coil ice storage device (4), a glycol solution tank (5), a glycol pump (6), a second electromagnetic valve (7), a second three-way valve (8), a chilled water pump (9), a plate heat exchanger (10), a tail water supply end (11), a tail water return end (12), a third electromagnetic valve (13), a water pump (14), a water source heat pump unit (15), a third three-way valve (16), a cold/heat storage water tank (17), a fourth electromagnetic valve (18), a double-working-condition refrigeration/heat engine group (1), a first electromagnetic valve (2), a first three-way valve (3), an ice coil ice storage device (4), a glycol solution tank (5) and a glycol pump (6) form an ice storage loop, the water source heat pump unit (15), the third three-way valve (16) and the cold/heat storage water tank (17) form a water/heat loop, the second electromagnetic valve (7), the second three-way valve (8), the water pump (9), the plate heat exchanger (10), the tail water supply end (11), the tail water end (12) and the fourth electromagnetic valve (18) form a cold/hot storage loop,
the system operates in the following modes:
1) In the period of night valley electricity in summer, the system operates in a cold accumulation mode, and the mode is divided into an ice-only cold accumulation mode, a water-only cold accumulation mode and an ice water double-accumulation mode,
when the double-working-condition refrigerating/heating unit (1) is opened, the first electromagnetic valve (2) is opened, the first three-way valve (3) is adjusted to be AB-direction, the ethylene glycol pump (6) is opened, and other devices are in a closed state, namely an ice-only cold storage mode, ethylene glycol enters an evaporator of the double-working-condition refrigerating/heating unit to exchange heat under the action of the ethylene glycol pump (6), so that the ethylene glycol with cold energy is obtained, exchanges heat with water in the device in the ice coil ice storage device (4) to release cold energy, then enters an ethylene glycol solution tank to complete circulation, enters the next circulation period, and the water in the ice coil ice storage device obtains the cold energy released by the ethylene glycol and then prepares ice cakes outside the coil;
when the water source heat pump unit (15) is opened, the three-way valve (16) is regulated to be in the AB direction, and other devices are in a closed state, the water only cold storage mode is adopted, and the low-temperature water is prepared by the water source heat pump unit and is stored in the cold/heat storage water tank (17) in the mode;
when the electromagnetic valve III (13) is closed and the water pump (14) is closed, the rest device states are the ice storage mode and the water storage mode, namely the ice water double-storage mode, and the double-working-state refrigeration/heat engine unit (1) and the water source heat pump unit (15) are in a parallel working state in the mode, and the ice storage mode and the water storage mode are respectively operated;
2) In the peak electricity period in the daytime in summer, the system operates in a cold releasing mode, and the mode is divided into a cold releasing mode of only melting ice, a cold releasing mode of only low temperature water, a simultaneous cold releasing mode of ice water and a cold supplying mode of a double-station refrigerating/heating unit (1),
when the electromagnetic valve II (7) is opened, the three-way valve II (8) is adjusted to be in the AB direction, the chilled water pump (9) is opened, and other devices are in a closed state, namely an ice melting and cooling mode only, in which the return water at the tail end (12) exchanges heat with the plate heat exchanger (10) and then enters the ice coil ice storage device (4) to melt ice and cool to obtain low-temperature chilled water, and the low-temperature chilled water is supplied to the tail end water supply end (11) under the action of the chilled water pump (9);
when the electromagnetic valve IV (18) is opened and the chilled water pump (9) is opened, the rest devices are in a closed state, namely a low-temperature water cooling mode is adopted, and the low-temperature water stored in the cold/heat storage water tank (17) in the mode supplies cold to the tail end water supply end (11) under the action of the chilled water pump (9);
when the electromagnetic valve II (7) is opened, the three-way valve II (8) is adjusted to be in the AB direction, the electromagnetic valve IV (18) is opened, the chilled water pump (9) is in an opened state, and other devices are in a closed state, the system is in an ice water simultaneous cooling releasing state;
when the ice water is released simultaneously and the terminal cooling requirement can not be met, the double-station refrigerating/heating unit (1) is started, meanwhile, the first electromagnetic valve (2) is started, the first three-way valve (3) is adjusted to be in an AC direction, and the second three-way valve (8) is adjusted to be in a CB direction, so that the defect of cooling load is overcome;
3) During winter night off-peak electricity period
In the period of night off-peak electricity in winter, the system operates in a heat storage mode, in particular a water heat storage mode,
when the double-working-condition refrigerating/heating machine set (1) is started, the electromagnetic valve III (13) is started, the water pump (14) is started, the water source heat pump set (15) is started, the three-way valve III (16) is adjusted to be in the AB direction, the electromagnetic valve IV (18) is closed, and other devices are in a closed state, namely a water heat storage mode, the double-working-condition refrigerating/heating machine set (1) prepares low-temperature hot water in the mode, the low-temperature hot water enters the water source heat pump set (15) under the action of the water pump (14) and is lifted to high-temperature hot water, and the high-temperature hot water is stored in the cold storage/heat storage water tank;
4) The system operates in a heat release mode in the daytime electricity consumption peak period in winter, and the mode can be divided into a cold accumulation/heat accumulation water tank heat release mode and a unit heat supply mode,
when the electromagnetic valve IV (18) is opened and the chilled water pump (9) is opened, the other devices are in a closed state, namely a cold accumulation/heat accumulation water tank heat release mode, and in the mode, the hot water stored by the night low-valley electric power is used for preferentially releasing heat, so that the heat supply requirement of the tail end water supply end (11) is met;
when the heat released by the cold/heat storage water tank (17) can not meet the tail end heat load demand, the double-working-condition refrigeration/heat engine unit (1) and the water source heat pump unit (15) are started, meanwhile, the electromagnetic valve III (13) is started, the water pump (14) and the three-way valve III (16) are adjusted to be in an AC direction, the three-way valve I (3) is adjusted to be in an AC direction, the three-way valve II (8) is adjusted to be in a CB direction, the chilled water pump (9) is started, and the residual heat load demand of the tail end water supply end (11) is supplemented.
2. The series-parallel connection heat pump cold and hot double-storage energy supply system is characterized by comprising a double-working-condition refrigeration/heat engine set (1), a first electromagnetic valve (2), a first three-way valve (3), an ice coil ice storage device (4), a glycol solution tank (5), a glycol pump (6), a second electromagnetic valve (7), a second three-way valve (8), a chilled water pump (9), a plate heat exchanger (10), a tail water supply end (11), a tail water return end (12), a third electromagnetic valve (13), a water pump (14), a ground source heat pump unit (22), a third three-way valve (16), a cold/heat storage water tank (17), a fourth electromagnetic valve (18), a subcooler (19), a circulating water pump (20) and a supercooling degree relieving device (21), wherein the double-working-condition refrigeration/heat engine set (1), the first electromagnetic valve (2), the first three-way valve (3), the ice coil ice storage device (4), the glycol solution tank (5), the glycol pump (6), the subcooling device (19), the circulating water pump (20), the supercooling degree relieving device (21) form a supercooling water ice loop, the ground source heat pump unit (22), the third heat pump unit (16), the third electromagnetic valve (16), the third heat pump (17), the circulating water pump (17) and the second three-way heat pump (7), the cold water pump (7), the cold heat pump and the second heat pump The plate heat exchanger (10), the tail water supply end (11), the tail water return end (12) and the solenoid valve (18) form a cold/heat release loop,
the system operates in the following modes:
1) In the period of night valley electricity in summer, the system operates in a cold accumulation mode, and the mode is divided into an ice-only cold accumulation mode, a water-only cold accumulation mode and an ice water double-accumulation mode,
when the double-working-condition refrigerating/heating unit (1) is opened, the first electromagnetic valve (2) is opened, the first three-way valve (3) is regulated to be AB-direction, the glycol pump (6) and the circulating water pump (20) are opened, the other devices are in a closed state, namely an ice-only cold storage mode, glycol enters an evaporator of the double-working-condition refrigerating/heating unit to exchange heat under the action of the glycol pump (6), the glycol with obtained cold enters a glycol solution tank to complete circulation after exchanging heat with water in the ice coil ice storage device (4) in the supercooler (19), the water in the ice coil ice storage device obtains cold released by glycol to form supercooled water, ice slurry is formed under the action of the supercooling degree releasing device (21), the ice slurry is stored in the ice coil ice storage device (4),
when the ground source heat pump unit (22) is opened, the three-way valve (16) is regulated to be in the AB direction, and other devices are in a closed state, namely a water-only cold storage mode, the low-temperature water is prepared by the ground source heat pump unit in the mode and is stored in the cold/heat storage water tank (17);
when the electromagnetic valve III (13) is closed and the water pump (14) is closed, the rest device states are the ice storage mode and the water storage mode, namely the ice water double-storage mode, and the double-working-state refrigeration/heat engine unit (1) and the ground source heat pump unit (22) are in a parallel working state in the mode, and the ice storage and water storage working modes are respectively operated;
2) In the peak electricity period in the daytime in summer, the system operates in a cold releasing mode, and the mode is divided into a cold releasing mode of only melting ice, a cold releasing mode of only low temperature water, a simultaneous cold releasing mode of ice water and a cold supplying mode of a double-station refrigerating/heating unit (1),
when the electromagnetic valve II (7) is opened, the three-way valve II (8) is adjusted to be in the AB direction, the chilled water pump (9) is opened, and other devices are in a closed state, namely an ice melting and cooling mode only, in which the return water at the tail end (12) exchanges heat with the plate heat exchanger (10) and then enters the ice coil ice storage device (4) to melt ice and cool to obtain low-temperature chilled water, and the low-temperature chilled water is supplied to the tail end water supply end (11) under the action of the chilled water pump (9);
when the electromagnetic valve IV (18) is opened and the chilled water pump (9) is opened, the rest devices are in a closed state, namely a low-temperature water cooling mode is adopted, and the low-temperature water stored in the cold/heat storage water tank (17) in the mode supplies cold to the tail end water supply end (11) under the action of the chilled water pump (9);
when the electromagnetic valve II (7) is opened, the three-way valve II (8) is adjusted to be in the AB direction, the electromagnetic valve IV (18) is opened, the chilled water pump (9) is in an opened state, and other devices are in a closed state, the system is in an ice water simultaneous cooling releasing state;
when the ice water is released simultaneously and the terminal cooling requirement can not be met, the double-station refrigerating/heating unit (1) is started, meanwhile, the first electromagnetic valve (2) is started, the first three-way valve (3) is adjusted to be in an AC direction, and the second three-way valve (8) is adjusted to be in a CB direction, so that the defect of cooling load is overcome;
3) During winter night off-peak electricity period
In the period of night off-peak electricity in winter, the system operates in a heat storage mode, in particular a water heat storage mode,
when the double-working-condition refrigerating/heating machine set (1) is opened, the electromagnetic valve III (13) is opened, the water pump (14) is opened, the ground source heat pump set (22) is opened, the three-way valve III (16) is adjusted to be in the AB direction, the electromagnetic valve IV (18) is closed, and other devices are in a closed state, namely a water heat storage mode, the double-working-condition refrigerating/heating machine set (1) prepares low-temperature hot water in the mode, the low-temperature hot water enters the ground source heat pump set (22) under the action of the water pump (14) and is lifted to high-temperature hot water, and the high-temperature hot water is stored in the cold storage/heat storage water tank;
4) The system operates in a heat release mode in the daytime electricity consumption peak period in winter, and the mode can be divided into a cold accumulation/heat accumulation water tank heat release mode and a unit heat supply mode;
when the solenoid valve IV (18) is opened and the chilled water pump (9) is opened, the rest devices are in a closed state, namely a cold/heat storage water tank heat release mode, in the mode, the hot water stored by the night low-valley electric power is utilized to release heat preferentially, so that the heat supply requirement of the tail water supply end (11) is met,
when the heat released by the cold/heat storage water tank (17) can not meet the tail end heat load requirement, the double-working-condition refrigeration/heat engine unit (1) and the ground source heat pump unit (22) are started, meanwhile, the electromagnetic valve III (13) is started, the water pump (14) and the three-way valve III (16) are adjusted to be AC, the three-way valve I (3) is adjusted to be AC, the three-way valve II (8) is adjusted to be CB, the chilled water pump (9) is started, and the residual heat load requirement of the tail end water supply end (11) is supplemented.
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| CN109084495B (en) * | 2018-08-14 | 2023-09-26 | 中节能城市节能研究院有限公司 | Jet type artificial snow refrigerating cold storage system |
| CN109973242A (en) * | 2019-04-23 | 2019-07-05 | 沪东重机有限公司 | A kind of engine exhaust heat based on phase-transition heat-storage utilizes device and application method |
| CN115183350B (en) * | 2022-07-12 | 2024-04-16 | 哈尔滨工业大学 | Detachable sleeve grading energy storage type thermoelectric heat storage heat supply/cold storage refrigeration system and method |
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