CN110822598A - Refrigerating system and refrigerating method based on cross-season cold accumulation - Google Patents
Refrigerating system and refrigerating method based on cross-season cold accumulation Download PDFInfo
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- CN110822598A CN110822598A CN201911150388.2A CN201911150388A CN110822598A CN 110822598 A CN110822598 A CN 110822598A CN 201911150388 A CN201911150388 A CN 201911150388A CN 110822598 A CN110822598 A CN 110822598A
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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
- 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
- F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
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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
- F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0057—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 using natural energy, e.g. solar energy, energy from the ground receiving heat-exchange fluid from a closed circuit in the ground
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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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 provides a refrigerating system and a refrigerating method based on cross-season cold accumulation. The cold accumulation subsystem comprises a natural cooling heat exchanger, a first heat exchanger and a ground heat exchanger. The cold accumulation subsystem is used for acquiring cold energy in a natural cold source and storing the cold energy in soil; the cooling subsystem is used for acquiring the cold energy in the cold accumulation subsystem and then outputting the cold energy to a user; the natural cold source is stored and used in different seasons while the requirement of refrigerating in the season is met, so that the refrigerating energy consumption under the condition of natural energy shortage is effectively reduced; the control subsystem is used for monitoring and controlling the running state of each device, so that the optimal running mode is selected for the refrigerating system, and the energy consumption of the refrigerating system is further reduced.
Description
Technical Field
The invention relates to the technical field of refrigeration air conditioners, in particular to a refrigeration system and a refrigeration method based on cross-season cold accumulation.
Background
At present, the demand of cold energy is getting bigger and bigger, such as the cold consumption of industrial factory buildings and data equipment, and the like, and the season with high temperature is particularly prominent. The existing cold energy production is almost realized by electric energy, for example, high-density heating objects have cooling requirements all year round, the energy consumption of air conditioners is huge, the energy consumption of a Chinese data center in 2015 is up to 1000 hundred million kW.h, which is equivalent to the energy generation of a three-gorge hydropower station all year round, and the energy consumption of the Chinese data center is expected to further reach 2500 hundred million kW.h in 2021 year. The power consumption of the air conditioner of the data center accounts for about 40% of the energy consumption of the whole data center. The larger the consumption of air conditioners, the more the power consumption, the direct problems of power-limiting crisis in summer and large energy consumption, and the full utilization of natural cold energy is an effective way to realize energy conservation.
Common air natural cold source utilization forms mainly comprise fresh air natural cooling, evaporative cooling, cooling tower cooling, secondary refrigerant natural cooling, heat pipe natural cooling, fluorine pump circulating cooling and the like. Direct introduction new trend and the direct evaporative cooling of new trend have reduced the heat transfer link than other modes, and cooling efficiency is the highest, however, this cooling method is with indoor and external direct intercommunication, and indoor cleanliness factor and humidity are difficult to the guarantee to equipment trouble risk has been brought. The utilization method of the indirect heat exchange natural cold source mainly comprises the following forms according to different heat exchange and cold energy transmission and distribution modes, namely an air/air heat exchanger utilization technology, an indirect evaporative cooling technology, a cooling tower cold supply technology, a secondary refrigerant heat exchange technology, an integral heat pipe heat exchange technology, a separated heat pipe heat exchange technology, a refrigerant pump drive loop heat pipe heat exchange technology and the like. The prior art utilizes natural cold sources to different degrees and has better operation effect, but the prior art is only used in seasons with sufficient natural cold sources, and the required quantity of cold energy is low in low-temperature seasons and under the condition of sufficient natural cold sources, so that the natural cold sources cannot be fully utilized and collected; in high temperature season, the nature cold source is deficient to the demand of cold volume is huge, and the nature cold source can't provide the huge cold volume demand of sufficient cold volume supply at all, and prior art also does not collect the natural cold source in low temperature season and store the back and reapply in high temperature season, leads to the problem that current refrigeration energy consumption is high to obtain fundamental solution.
Disclosure of Invention
Technical problem to be solved
The invention provides a refrigerating system and a refrigerating method based on cross-season cold accumulation, which can store cold energy in winter and use the cold energy for refrigerating in summer and aims to solve the problem of high energy consumption for refrigerating a high-density heating object.
(II) technical scheme
In order to achieve the above object, the present invention provides a refrigeration system based on cross-season cold storage, comprising:
the cold accumulation subsystem, the cooling subsystem and the control subsystem;
the cold accumulation subsystem comprises a natural cooling heat exchanger, a first heat exchanger and a ground heat exchanger; the first heat exchanger is provided with a first fluid outlet, a first fluid inlet, a second fluid outlet and a second fluid inlet; wherein an outlet of the natural cooling heat exchanger is connected with a first fluid inlet of the first heat exchanger, and an inlet of the natural cooling heat exchanger is connected with a first fluid outlet of the first heat exchanger;
a first regulating valve is arranged on a pipeline between a first fluid outlet of the first heat exchanger and an inlet of the natural cooling heat exchanger, and a channel valve is arranged on a pipeline between an outlet of the natural cooling heat exchanger and the first fluid inlet of the first heat exchanger;
a second fluid outlet of the first heat exchanger is connected with an inlet of the ground heat exchanger through a circulating pump, and a second fluid inlet of the first heat exchanger is connected with an outlet of the ground heat exchanger;
the outlet of the cooling subsystem is connected with the inlet of the natural cooling heat exchanger through a connecting pipeline, a second regulating valve is arranged on the connecting pipeline, and the inlet of the cooling subsystem is connected with the downstream of the channel valve;
the first regulating valve, the second regulating valve, the channel valve and the circulating pump are all connected with the control subsystem.
Preferably, a first temperature sensor is arranged on a pipeline of a second fluid outlet of the first heat exchanger, a second temperature sensor is arranged on a pipeline of a second fluid inlet of the first heat exchanger, and the first temperature sensor and the second temperature sensor are both connected with the control subsystem.
Preferably, the cooling subsystem comprises a second heat exchanger, an air-conditioning end device and a coolant pump, the second heat exchanger is provided with a third fluid outlet, a third fluid inlet, a first fluid outlet and a first fluid inlet, the outlet of the air-conditioning end device is connected with the third fluid inlet of the second heat exchanger, the inlet of the air-conditioning end device is connected with the third fluid outlet of the second heat exchanger, the first fluid outlet of the second heat exchanger is the outlet of the cooling subsystem, and the first fluid inlet of the second heat exchanger is the inlet of the cooling subsystem; and a coolant carrying pump is arranged on a pipeline between the inlet of the air conditioner terminal device and the third fluid outlet of the second heat exchanger, and the coolant carrying pump is connected with the control subsystem.
Preferably, heat exchange liquid is filled in the ground heat exchanger and a pipeline connected with the ground heat exchanger, refrigerant is filled in the natural cooling heat exchanger and a pipeline connected with the natural cooling heat exchanger, and refrigerant is filled in the air conditioner terminal device and a pipeline connected with the air conditioner terminal device.
Preferably, a third temperature sensor is arranged on a pipeline of an outlet of the air-conditioning end device, a fourth temperature sensor is arranged on a pipeline of an inlet of the air-conditioning end device, and the third temperature sensor and the fourth temperature sensor are both connected with the control subsystem.
Preferably, the ground heat exchanger is located in the soil.
Preferably, the vertical distance from the natural cooling heat exchanger to the ground is greater than that from the first heat exchanger to the ground, and the vertical distance from the first heat exchanger to the ground is greater than that from the second heat exchanger to the ground.
Preferably, the first regulating valve and the second regulating valve are flow control valves, and the passage valve is a shutoff valve.
Further, the invention also provides a refrigeration method based on cross-season cold accumulation, which is applied to the refrigeration system and comprises the following steps:
in a winter state, all equipment of the cold accumulation subsystem and the cooling subsystem are started, the natural cooling heat exchanger absorbs an outdoor natural cold source and then transfers cold energy to the air conditioner terminal device through the second heat exchanger, and meanwhile, the natural cooling heat exchanger transfers the cold energy to the buried pipe heat exchanger through the first heat exchanger and is used for storing the cold energy into soil;
in a spring and autumn state, the first regulating valve and the circulating pump are closed, and the natural cooling heat exchanger absorbs an outdoor natural cold source and then transmits cold energy to the air conditioner tail end device through the second heat exchanger;
and in summer, the channel valve is closed, and the ground heat exchanger absorbs cold energy in soil and then sequentially passes through the first heat exchanger and the second heat exchanger to transmit the cold energy to the air conditioner terminal device.
(III) advantageous effects
The invention has the beneficial effects that: the natural cold source is obtained by the cold accumulation subsystem and stored in the soil, so that the natural cold source is stored and used in a season-crossing manner while the requirement of refrigerating in the season is met, and the refrigerating energy consumption under the condition of natural energy shortage is effectively reduced; the control subsystem is used for monitoring and controlling the running state of each device, so that the optimal running mode is selected for the refrigerating system, and the energy consumption of the refrigerating system is further reduced. The invention adopts a refrigeration mode of coupling the cold accumulation subsystem and the cooling subsystem, does not need the auxiliary refrigeration of the compressor, can be better suitable for various environments and has better practicability.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a refrigerating system and a refrigerating method based on cross-season cold accumulation according to the present invention;
FIG. 2 is a schematic diagram of the winter state operation of the refrigeration system and method based on cross-season cold accumulation of the present invention;
FIG. 3 is a schematic diagram of the spring and autumn state operation of the refrigerating system and method based on cross-season cold accumulation of the present invention;
fig. 4 is a schematic diagram of the operation of the refrigerating system and the refrigerating method based on the cross-season cold accumulation in the summer state.
[ description of reference ]
1: a first regulating valve; 2: a second regulating valve;
11: naturally cooling the heat exchanger; 12: a first heat exchanger; 13: a circulation pump; 14: a ground heat exchanger; 15: a channel valve;
21: an air conditioning terminal device; 22: a second heat exchanger; 23: a coolant pump;
31: a first temperature sensor; 32: a second temperature sensor; 33: a third temperature sensor; 34: a fourth temperature sensor;
40: and a control subsystem.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
It should be noted that all the directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention provides a refrigerating system based on cross-season cold accumulation, as shown in figure 1, the refrigerating system comprises a cold accumulation subsystem, a cooling subsystem and a control subsystem 40. The cold accumulation subsystem is used for acquiring and storing cold in a natural cold source; the cooling subsystem is used for acquiring cold energy in the cold accumulation subsystem and then outputting the cold energy to a user. The cold storage subsystem comprises a natural cooling heat exchanger 11, a first heat exchanger 12 and a ground heat exchanger 14 arranged in the soil. The first heat exchanger 12 is provided with a first fluid outlet, a first fluid inlet, a second fluid outlet and a second fluid inlet; wherein, the outlet of the natural cooling heat exchanger 11 is connected with the first fluid inlet of the first heat exchanger 12, the inlet of the natural cooling heat exchanger 11 is connected with the first fluid outlet of the first heat exchanger 12, and the natural cooling heat exchanger 11 is preferably an air-cooled condenser or an evaporative condenser and the combination of the two. When the cold accumulation process is in operation, the natural cooling heat exchanger 11 obtains natural cold, the cold is exchanged to the buried pipe heat exchanger 14 buried in the soil through the first heat exchanger 12, and the buried pipe heat exchanger 14 conveys the cold to the soil for storage.
Further, a first regulating valve 1 is arranged on a pipeline between the first fluid outlet of the first heat exchanger 12 and the inlet of the natural cooling heat exchanger 11, a channel valve 15 is arranged on a pipeline between the first fluid inlet of the first heat exchanger 12 and the outlet of the natural cooling heat exchanger 11, the first regulating valve 1 is preferably a flow control valve, and the channel valve 15 is preferably a shutoff valve. Referring to fig. 2 and 4, in the process of accumulating cold to soil by the ground heat exchanger 14, the first heat exchanger 12 is used for conveying cold energy acquired by the natural cooling heat exchanger 11 to the ground heat exchanger 14, refrigerant flows out of the natural cooling heat exchanger 11, flows in from the first fluid inlet after passing through the channel valve 15, flows out from the first fluid outlet after cold energy exchange is completed, and returns to the natural cooling heat exchanger 11 after passing through the first regulating valve 1. During the process of absorbing the cold in the soil and delivering the cold to the cooling subsystem by the ground heat exchanger 14, the refrigerant flows out of the first fluid inlet, flows in from the inlet of the cooling subsystem, flows out from the outlet of the cooling subsystem, flows back to the first heat exchanger 12 from the first fluid outlet after passing through the second regulating valve 2 and the first regulating valve 1, and the first regulating valve 1 and the second regulating valve 2 are preferably flow control valves.
Preferably, the second fluid outlet of the first heat exchanger 12 is connected to the inlet of the borehole heat exchanger 14 by a circulation pump, and the second fluid inlet of the first heat exchanger 12 is connected to the outlet of the borehole heat exchanger 14. And a circulating pump 13 is arranged on a pipeline between the second fluid outlet and the inlet of the ground heat exchanger 14 so as to improve the heat exchange efficiency. The outlet of the cooling subsystem is connected with the inlet of the natural cooling heat exchanger 11 through a connecting pipeline, a second regulating valve 2 is arranged on the connecting pipeline, and the inlet of the cooling subsystem is connected with the downstream of the channel valve 15. First governing valve 1, second governing valve 2, passage valve 15 and circulating pump 13 all are connected with control subsystem 40, and control subsystem 40 controls refrigerating system's operational mode through the state of controlling first governing valve 1, second regulation, passage valve 15 and circulating pump 13, selects more energy-conserving refrigeration mode for refrigerating system, further reduces the refrigeration energy consumption.
Further, the second fluid outlet is provided with the first temperature sensor 31, the second fluid inlet is provided with the second temperature sensor 32, the first temperature sensor 31 and the second temperature sensor 32 are both connected with the signal input end of the control subsystem 40, the temperature of the liquid at the second fluid outlet and the second fluid inlet is convenient to monitor in real time, therefore, the cold accumulation amount in the soil is more accurately mastered, and the basis is provided for the selection of various modes of the refrigeration system.
As shown in fig. 1, the cooling subsystem, which is the refrigeration system end for delivering refrigeration to a user, includes a second heat exchanger 22, an air conditioning end unit 21, and a coolant-carrying pump 23. The second heat exchanger 22 is provided with a third fluid outlet, a third fluid inlet, a first fluid outlet and a first fluid inlet, the outlet of the air-conditioning end device 21 is connected with the third fluid inlet of the second heat exchanger 22, the inlet of the air-conditioning end device 21 is connected with the third fluid outlet of the second heat exchanger 22, the first fluid outlet of the second heat exchanger 22 is the outlet of the cooling subsystem, the first fluid inlet of the second heat exchanger 22 is the inlet of the cooling subsystem, the cooling subsystem exchanges heat with the cold accumulation subsystem through the second heat exchanger 22, the cooling subsystem is guaranteed to be in an isolated state with the cold accumulation subsystem, and the situation that a user is directly contacted with the external environment to be polluted by the external environment is avoided. A coolant pump 23 is arranged on a pipeline between the third fluid outlet of the second heat exchanger 22 and the inlet of the air-conditioning end device 21, the coolant pump 23 is connected with the output end of the control subsystem 40, and the start, stop and rotation speed of the coolant pump 23 are controlled in real time through the control subsystem 40. The pipeline of the outlet of the air-conditioning end device 21 is provided with a third temperature sensor 33, the pipeline of the inlet of the air-conditioning end device 21 is provided with a fourth temperature sensor 34, the third temperature sensor 33 and the fourth temperature sensor 34 are both connected with the input end of the control subsystem 40, the temperature in the inlet and the outlet of the air-conditioning end device 21 can be monitored conveniently in real time, the refrigeration effect of the refrigeration system can be known by reading the temperature value, and the basis is provided for selection of various modes of the refrigeration system.
Preferably, the ground heat exchanger 14 and the pipeline connected with the ground heat exchanger 14 are filled with heat exchange fluid, and the heat exchange fluid can be ethanol, water, glycol antifreeze or salt solution such as sodium chloride and calcium chloride; the natural cooling heat exchanger 11 and the pipeline connected with the natural cooling heat exchanger 11 are filled with refrigerant, the refrigerant is preferably Freon or carbon dioxide, and the refrigerant is selected from liquid which is heated and is easy to volatilize; the air conditioning end device 21 and the pipeline connected to the air conditioning end device 21 are both filled with a coolant, and the coolant is preferably water or freon.
In addition, in a more preferable embodiment, the vertical distance from the natural cooling heat exchanger 11 to the ground is greater than the vertical distance from the first heat exchanger 12 to the ground, and the vertical distance from the first heat exchanger 12 to the ground is greater than the vertical distance from the second heat exchanger 22 to the ground, so that the circulation of the refrigerant in the refrigeration coil, the first heat exchanger and the natural cooling heat exchanger 11 is effectively ensured under the condition of no auxiliary power. The refrigerant is preferably circulated by a heat pipe technique using a difference in density between gas and liquid phases of the refrigerant to flow the refrigerant.
In addition, the invention also provides a refrigeration method based on cross-season cold accumulation, which comprises the following steps:
in the state that the temperature is lower than 5-10 ℃ in winter, the natural cold source is sufficient, and sufficient cold energy is used for refrigerating the high-density heating object and simultaneously storing cold for the soil. Starting all devices of the cold accumulation subsystem and the cooling subsystem, and transmitting cold energy to the air conditioner tail end device 21 through the second heat exchanger 22 after the natural cooling heat exchanger 11 absorbs an outdoor natural cold source for refrigerating a high-density heating object; the natural cooling heat exchanger 11 transfers the cold to the borehole heat exchanger 14 through the first heat exchanger 12 for storage into the soil.
In the state that the temperature is higher than 5-10 ℃ and lower than 20-30 ℃ in spring and autumn, the natural cold source can only meet the refrigeration requirement of a user. And the first regulating valve 1 and the circulating pump 13 are closed, and the natural cooling heat exchanger 11 absorbs the outdoor natural cold source and transmits the cold energy to the air-conditioning end device 21 through the second heat exchanger 22.
In the state that the temperature is higher than 20-30 ℃ in summer, a natural cold source is lacked, and the cold energy stored in the soil is needed to refrigerate the high-density heating object. And (3) closing the channel valve 15, absorbing the cold energy in the soil by the ground heat exchanger 14, then sequentially passing through the first heat exchanger 12 and the second heat exchanger 22, and transmitting the cold energy to the air conditioner terminal device 21.
In a specific embodiment, the refrigeration system of the present invention is used to cool down a high-density heat generating object, and the inlet temperature T of the air conditioner terminal device 21 is preset1Has a floating range of T1min～T1maxTemperature T at the outlet2Has a floating range of T2min～T2maxTemperature difference Δ T between inlet and outlet of air conditioner end unit 211Has a floating range of Δ T1min～ΔT1max(ii) a The temperature difference Δ T between the second fluid outlet and the second fluid inlet of the first heat exchanger 122Has a floating range of Δ T2min～ΔT2max。
As shown in fig. 2, in the winter season with low temperature, the natural cold source is very sufficient, and sufficient cold energy is used for refrigerating the high-density heating object and simultaneously storing cold for the soil. Starting all devices of the cold accumulation subsystem and the cooling subsystem, and transmitting cold energy to the air conditioner tail end device 21 through the second heat exchanger 22 after the natural cooling heat exchanger 11 absorbs an outdoor natural cold source for refrigerating a high-density heating object; the natural cooling heat exchanger 11 transfers the cold to the borehole heat exchanger 14 through the first heat exchanger 12 for storage into the soil. The control method comprises the following steps:
reduced heat absorption by the air conditioning end unit 21, T1<T1minThen, the second regulating valve 2 is regulated to reduce the flow of the refrigerant in the pipeline, and T is adjusted1Is controlled at T1min～T1maxWhile reducing the rotational speed of the coolant pump 23 by Δ T1Is controlled at Δ T1min～ΔT1maxTo (c) to (d); adjusting the first regulating valve 1 to increase the flow of the refrigerant in the pipe if Δ T2>ΔT2maxRaising the rotational speed of the circulating pump 13 by delta T2Is controlled at Δ T2min～ΔT2maxAnd the cold storage is accelerated.
When the amount of heat absorbed by the air conditioner terminal device 21 increases, T1>T1maxAdjusting the second adjusting valve 2 to increase the flow of the pipeline refrigerant, and adjusting T1Is controlled at T1min～T1maxWhile increasing the rotational speed of the coolant pump 23 by Δ T1Is controlled at Δ T1min～ΔT1maxTo (c) to (d); adjusting the first regulating valve 1 to reduce the flow of the refrigerant in the pipeline if delta T2<ΔT2minReducing the rotational speed of the circulating pump 13 by Δ T2Is controlled at Δ T2min～ΔT2maxAnd the energy consumption of the refrigeration system is reduced.
As shown in fig. 3, the natural cold source can only meet the cooling needs of the user. And the first regulating valve 1 and the circulating pump 13 are closed, and the natural cooling heat exchanger 11 absorbs the outdoor natural cold source and transmits the cold energy to the air conditioner tail end device 21 through the second heat exchanger 22. The control method comprises the following steps:
when the amount of heat absorbed by the air conditioner end unit 21 decreases, T1<T1minAdjusting the second regulating valve 2 to reduce the flow of the refrigerant in the pipeline, and adjusting the pressure of the refrigerant in the pipeline to be T1Is controlled at T1min～T1maxWhile reducing the rotational speed of the coolant pump 23 by Δ T1Is controlled at Δ T1min～ΔT1maxIn the meantime.
When the amount of heat absorbed by the air conditioner terminal device 21 increases, T1>T1maxAdjusting the second adjusting valve 2 to increase the flow of the refrigerant in the pipeline, and adjusting the pressure of the refrigerant in the pipeline to be T1Is controlled at T1min～T1maxWhile increasing the rotational speed of the coolant pump 23 by Δ T1Is controlled at Δ T1min～ΔT1maxIn the meantime.
As shown in fig. 4, in the season of high temperature in summer, the natural cold source is lacked, and the cold stored in the soil is needed to refrigerate the high-density heating object. And (3) closing the channel valve 15, absorbing the cold energy in the soil by the ground heat exchanger 14, then sequentially passing through the first heat exchanger 12 and the second heat exchanger 22, and transmitting the cold energy to the air conditioner terminal device 21. The control method comprises the following steps:
when the amount of heat absorbed by the air conditioner end unit 21 decreases, T1<T1minAdjusting the second adjusting valve 2 and the first adjusting valve 1 to reduce the flow of the pipeline refrigerant, and adjusting T1Is controlled at T1min～T1maxIn between, the rotational speed of the coolant pump 23 is reduced by Δ T1Is controlled at Δ T1min～ΔT1maxIf Δ T2<ΔT2minReducing the rotational speed of the circulating pump 13 by Δ T2Is controlled at Δ T2min～ΔT2maxIn the meantime.
When the amount of heat absorbed by the air conditioner terminal device 21 increases, T1>T1maxAdjusting the second adjusting valve 2 and the first adjusting valve 1 to increase the flow of the pipeline refrigerant, and adjusting T1Is controlled at T1min～T1maxIn between, the rotational speed of the coolant pump 23 is increased by Δ T1Is controlled at Δ T1min～ΔT1maxIf Δ T2>ΔT2maxRaising the rotational speed of the circulating pump 13 by delta T2Is controlled at Δ T2min～ΔT2maxIn the meantime.
By adding the soil cold accumulation subsystem, the invention realizes cross-season utilization of the natural cold source while realizing high-efficiency utilization of the natural cold source in low-temperature seasons, and effectively solves the problem of high energy consumption of high-density heating objects caused by incapability of utilizing the natural cold source when the outdoor temperature is too high. The refrigeration of the high-density heating object and the cold accumulation of the soil are realized by utilizing the temperature difference between a natural cold source and the soil and the high-density heating object in winter, and the cold source in the soil is fully utilized to perform auxiliary refrigeration on the high-density heating object in summer. The heat pipe refrigeration mode is adopted, the condenser is arranged at the top, the condenser and the evaporator have height difference, refrigeration cycle is carried out by means of density difference and gravity, a compressor is not needed for compressing a refrigerant, and energy use is reduced. By adding a control system, the energy efficiency of the machine is maximized. The electric energy is greatly saved, and the energy consumption of a high-density heating object is reduced.
It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (9)
1. A refrigeration system based on cross-season cold storage, the refrigeration system comprising:
the cold accumulation subsystem, the cooling subsystem and the control subsystem;
the cold accumulation subsystem comprises a natural cooling heat exchanger, a first heat exchanger and a ground heat exchanger; the first heat exchanger is provided with a first fluid outlet, a first fluid inlet, a second fluid outlet and a second fluid inlet; wherein an outlet of the natural cooling heat exchanger is connected with a first fluid inlet of the first heat exchanger, and an inlet of the natural cooling heat exchanger is connected with a first fluid outlet of the first heat exchanger;
a first regulating valve is arranged on a pipeline between a first fluid outlet of the first heat exchanger and an inlet of the natural cooling heat exchanger, and a channel valve is arranged on a pipeline between an outlet of the natural cooling heat exchanger and the first fluid inlet of the first heat exchanger;
a second fluid outlet of the first heat exchanger is connected with an inlet of the ground heat exchanger through a circulating pump, and a second fluid inlet of the first heat exchanger is connected with an outlet of the ground heat exchanger;
the outlet of the cooling subsystem is connected with the inlet of the natural cooling heat exchanger through a connecting pipeline, a second regulating valve is arranged on the connecting pipeline, and the inlet of the cooling subsystem is connected with the downstream of the channel valve;
the first regulating valve, the second regulating valve, the channel valve and the circulating pump are all connected with the control subsystem.
2. The refrigerant system as set forth in claim 1, wherein a first temperature sensor is disposed in the conduit of the second fluid outlet of said first heat exchanger, a second temperature sensor is disposed in the conduit of the second fluid inlet of said first heat exchanger, and both said first temperature sensor and said second temperature sensor are connected to said control subsystem.
3. The refrigeration system of claim 1 wherein the cooling subsystem comprises a second heat exchanger, an air conditioning end unit, and a coolant pump, the second heat exchanger having a third fluid outlet, a third fluid inlet, a first fluid outlet, and a first fluid inlet, the air conditioning end unit outlet being connected to the second heat exchanger third fluid inlet, the air conditioning end unit inlet being connected to the second heat exchanger third fluid outlet, the second heat exchanger first fluid outlet being the cooling subsystem outlet, and the second heat exchanger first fluid inlet being the cooling subsystem inlet; and a coolant carrying pump is arranged on a pipeline between the inlet of the air conditioner terminal device and the third fluid outlet of the second heat exchanger, and the coolant carrying pump is connected with the control subsystem.
4. A refrigeration system according to claim 3 wherein the borehole heat exchanger and the conduit connecting thereto are each filled with a heat exchange fluid, the free-cooling heat exchanger and the conduit connecting thereto are each filled with a refrigerant, and the air conditioning end unit and the conduit connecting thereto are each filled with a refrigerant.
5. The refrigeration system according to any one of claims 1 to 4, wherein a third temperature sensor is arranged on a pipeline of an outlet of the air conditioning end device, a fourth temperature sensor is arranged on a pipeline of an inlet of the air conditioning end device, and the third temperature sensor and the fourth temperature sensor are both connected with the control subsystem.
6. A refrigeration system according to any one of claims 1 to 4, wherein the borehole heat exchanger is disposed in the soil.
7. The refrigeration system according to any one of claims 1 to 4, wherein a vertical distance from the free-cooling heat exchanger to the ground is greater than a vertical distance from the first heat exchanger to the ground, and the vertical distance from the first heat exchanger to the ground is greater than a vertical distance from the second heat exchanger to the ground.
8. The refrigerant system as set forth in any one of claims 1 to 4, wherein said first regulating valve and said second regulating valve are flow control valves, and said passage valve is a shutoff valve.
9. A refrigeration method based on cross-season cold accumulation, which is applied to the refrigeration system as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:
in a winter state, all equipment of the cold accumulation subsystem and the cooling subsystem are started, the natural cooling heat exchanger absorbs an outdoor natural cold source and then transfers cold energy to the air conditioner terminal device through the second heat exchanger, and meanwhile, the natural cooling heat exchanger transfers the cold energy to the buried pipe heat exchanger through the first heat exchanger and is used for storing the cold energy into soil;
in a spring and autumn state, the first regulating valve and the circulating pump are closed, and the natural cooling heat exchanger absorbs an outdoor natural cold source and then transmits cold energy to the air conditioner tail end device through the second heat exchanger;
and in summer, the channel valve is closed, and the ground heat exchanger absorbs cold energy in soil and then sequentially passes through the first heat exchanger and the second heat exchanger to transmit the cold energy to the air conditioner terminal device.
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