CN114992731A - System for realizing building refrigeration by only utilizing geothermal energy and air energy and control method - Google Patents
System for realizing building refrigeration by only utilizing geothermal energy and air energy and control method Download PDFInfo
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 244
- 238000001816 cooling Methods 0.000 claims abstract description 45
- 238000004364 calculation method Methods 0.000 claims description 34
- 239000000523 sample Substances 0.000 claims description 30
- 238000013461 design Methods 0.000 claims description 25
- 238000003860 storage Methods 0.000 claims description 11
- 238000004378 air conditioning Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000002689 soil Substances 0.000 description 15
- 238000012546 transfer Methods 0.000 description 9
- 238000011217 control strategy Methods 0.000 description 8
- 238000007791 dehumidification Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000013486 operation strategy Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- 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
- F24F11/67—Switching between heating and cooling modes
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
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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
- F24F7/00—Ventilation
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a system for realizing building refrigeration by only utilizing geothermal energy and air energy, which comprises a ground heat exchanger; the direct contact type heat exchanger is connected with the ground heat exchanger, and a loop is formed between the direct contact type heat exchanger and the ground heat exchanger through a pipeline; a diffuser connected to the direct contact heat exchanger; the air diffuser is connected with the direct contact type heat exchanger through an air pipe; the ground heat exchanger forms a loop with the fan coil through a pipeline; the air diffuser and the fan coil are arranged indoors; when the branch where the direct contact type heat exchanger is located works independently, the air cooling mode is adopted, when the branch where the fan coil is located works independently, the water cooling mode is adopted, and when the branch where the direct contact type heat exchanger is located and the branch where the fan coil is located work simultaneously, the air-water combined cooling mode is adopted; the system only utilizes geothermal energy and air energy, can adjust the indoor temperature and humidity of the building more energy-saving, and simultaneously meets the indoor fresh air requirement.
Description
Technical Field
The invention belongs to the technical field of energy-saving buildings, and particularly relates to a system and a control method for realizing building refrigeration by using geothermal energy and air energy only.
Background
The existing refrigeration system of buildings is generally realized in the following ways according to the types of the buildings: (1) in large and medium-sized public buildings and commercial buildings, a water chilling unit is mostly adopted to prepare cold water, and the cold water is sent to a terminal device to control the humidity and the temperature of indoor air and fresh air. (2) Small buildings such as residential buildings usually adopt a small water chilling unit or a heat pump unit to prepare cold water, and the cold water is sent to a terminal device to control the humidity and the temperature of indoor air and fresh air; or a direct expansion type air conditioning device (generally called a fluorine machine or a direct expansion machine) is adopted, the refrigerant is directly evaporated in the indoor end equipment, and the temperature and the humidity of indoor air and fresh air are controlled. (3) In dry areas such as northwest China, air and water are directly or indirectly contacted, namely, the indoor temperature and humidity are controlled by adopting an evaporative cooling mode. In the refrigeration modes (1) and (2), the air conditioning equipment needs to consume a large amount of electric energy or fuel or waste heat, and drives the refrigerating unit to prepare low-temperature cold water in a refrigeration cycle mode to realize indoor refrigeration of the building. In the refrigeration mode (3), although the refrigeration is realized mainly by using water evaporation cooling air, the refrigeration is only used in low-humidity areas such as northwest China and the like relatively efficiently due to the limitation of regional climate conditions, and meanwhile, an equipment system is huge due to the adoption of an all-air system.
In order to overcome the defects of the existing building refrigeration system, the existing patent 1 (application number 201810304331.2, in the Qin and Yingzhou, a solar refrigeration control system and a control method thereof) provides that solar energy is adopted to provide power for the refrigeration system, and the problem that a large amount of electric energy or fuel is consumed for realizing refrigeration in the traditional refrigeration modes (1) and (2) is solved; however, the use of solar panels can significantly increase the cost of the system and increase the refrigeration cost. In the prior patent 2 (application number 201610830. X, fan Yongxin, a refrigeration system utilizing outdoor air energy), a cooling tower is used for refrigerating, and a closed cooling tower is used for sending outdoor air cold energy into an indoor for heat exchange and cooling through circulating coolant of a circulating pump, so that the problem that the traditional refrigeration system cannot save cooling energy according to the change of outdoor temperature is solved, in addition, the system for realizing refrigeration by utilizing the cooling tower is compact and simple, and the problem that the equipment system in the traditional refrigeration mode (3) is huge is solved; but only the cooling load is considered and no dehumidification is considered and no specific operation control strategy is mentioned. Patent 3 (application number 200710150902.3, Liuwenxiu, ground source heat pump heating refrigerating system) proposes to use ground source heat pump system to be used for indoor refrigeration, and summer soil temperature is lower, and after the water as heat exchange medium released the heat in the ground, thereby sent into heat pump set with low temperature water and accomplished the indoor refrigeration operating mode. The low-grade heat energy is recycled partially, the problem that the refrigeration systems in the traditional refrigeration modes (1) and (2) consume a large amount of energy such as coal, fuel oil, electric energy and the like can be solved, in addition, the geothermal heat pump system utilizes geothermal energy, is less influenced by regional climate, and the problem that the traditional refrigeration mode (3) is limited by regional climate conditions is solved; however, the ground source heat pump system needs to be bound with the heating working condition in winter, and is a waste of the system for the area without the heating requirement.
It can be seen that, as for the cooling method of the building, many new methods using solar energy, air energy, geothermal energy, etc. have been innovatively proposed based on the conventional method, but there are some drawbacks in economical efficiency or functionality. Therefore, other feasible methods are innovatively provided, the defects of the existing method are overcome, and the method has important significance.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a system and a control method for realizing building refrigeration by only utilizing geothermal energy and air energy.
The technical scheme adopted by the invention is as follows:
a system for cooling a building using only geothermal energy and air energy, comprising:
a ground heat exchanger;
the direct contact type heat exchanger is connected with the ground heat exchanger, and a loop is formed between the direct contact type heat exchanger and the ground heat exchanger through a pipeline;
a diffuser connected to the direct contact heat exchanger; the air diffuser is connected with the direct contact type heat exchanger through an air pipe;
the fan coil is connected with the ground heat exchanger, and a loop is formed between the ground heat exchanger and the fan coil through a water pipeline;
the air diffuser and the fan coil are arranged indoors.
Furthermore, the outlet of the ground heat exchanger is respectively connected with the direct contact heat exchanger and the fan coil through a water separator, and the inlet of the ground heat exchanger is respectively connected with the direct contact heat exchanger and the fan coil through a water collector.
Furthermore, a stop valve and a variable frequency water pump are respectively arranged on pipelines which are connected with the direct contact type heat exchanger and the fan coil pipe at the outlet of the ground heat exchanger.
Furthermore, temperature probes are arranged on inlet side pipelines of the ground heat exchanger, the direct contact heat exchanger, the fan coil and the air diffuser, flow probes are arranged on outlet side pipelines of the ground heat exchanger, the direct contact heat exchanger, the fan coil and the air diffuser, humidity probes are arranged on outlet sides of the direct contact heat exchanger, the fan coil and the air diffuser, and electric energy measuring instruments are arranged on the direct contact heat exchanger and the fan coil.
Furthermore, the system is also provided with measuring equipment in the external environment and the indoor environment, and the measuring equipment comprises a temperature probe and a humidity probe.
The system further comprises a control device, wherein the control device is connected with the measuring device, the stop valve, the variable frequency water pump, the direct contact type heat exchanger, the fan coil and the air diffuser through signal lines; on one hand, the system operation data is collected, and on the other hand, the work start and stop of each electric device are controlled.
Further, the control device comprises a calculation model module, a data acquisition and storage module, a data processing module, a criterion forming module and an execution module, wherein,
the calculation model module calculates the heat exchange quantity and the system energy efficiency according to the collected system operation data, the collected environment data and the design parameters of the direct contact type heat exchanger and the ground heat exchanger;
the data acquisition and storage module is used for acquiring and storing system operation data, environment data and the start-stop state of equipment in the system;
the data processing module calls a calculation model module based on the data of the acquisition and storage module, and calculates the real-time and accumulated heat exchange amount of the direct contact heat exchanger and the ground heat exchanger respectively; calculating the system refrigerating capacity, real-time and accumulated system energy values;
the criterion forming module compares the data obtained by the calculation model module, the data acquisition and storage module and the data processing module with a preset value to form a criterion of a system execution operation mode; the set points include indoor design parameters and load requirements.
Further, the indoor design parameters include indoor air temperature, indoor air humidity, fresh air volume and the like; the load requirements comprise a cold load requirement, a fresh air load requirement and a wet load requirement.
Further, the direct contact type heat exchanger and the fan coil work alternatively or simultaneously; the branch where the direct contact type heat exchanger is located is in an air refrigeration mode when working independently, the branch where the fan coil is located is in a water refrigeration mode when working independently, and the branch where the direct contact type heat exchanger is located and the branch where the fan coil is located are in an air and water combined refrigeration mode when working simultaneously.
A method for realizing building refrigeration control by only utilizing geothermal energy and air energy comprises
S1, presetting each set value, wherein the set values comprise indoor design parameters and load requirements; the indoor design parameters comprise indoor air temperature, indoor air humidity, fresh air volume and the like; the load requirements comprise a cold load requirement, a fresh air load requirement and a wet load requirement.
And S2, collecting outdoor parameters of the building, such as outdoor air temperature, air moisture content, air relative humidity and the like.
S3, judging whether the building has a fresh air demand; and if the building has no fresh air demand, switching to S4, and if the building has a fresh air demand, switching to S5.
S4, judging whether the building has a wet load demand, and turning to S6 if the building has the wet load demand; if the building has no wet load requirement, calling a thermal calculation model and a system energy efficiency calculation model of the heat exchange equipment, and respectively calculating the refrigerating capacity and the system energy efficiency of an air refrigerating mode and the refrigerating capacity and the system energy efficiency of a water refrigerating mode;
and respectively judging the magnitude relation between the refrigerating capacity of the two modes and the building refrigerating load based on the calculated refrigerating capacity of the two modes. Firstly, judging whether the refrigerating capacity of an air refrigerating mode is larger than a cold load, judging whether the refrigerating capacity of a water refrigerating mode is larger than the cold load if the refrigerating capacity of the air refrigerating mode is larger than the cold load, judging whether the system energy efficiency of the water refrigerating mode is larger than the system energy efficiency of the air refrigerating mode if the refrigerating capacity of the water refrigerating mode is larger than the cold load, and selecting the water refrigerating mode if the system energy efficiency of the water refrigerating mode is larger than the system energy efficiency of the air refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is larger than the cold load, but the refrigerating capacity of the water refrigerating mode is smaller than the cold load, selecting the air refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is larger than the cold load, the refrigerating capacity of the water refrigerating mode is also larger than the cold load, but the system energy efficiency of the water refrigerating mode is smaller than that of the air refrigerating mode, the air refrigerating mode is selected;
if the refrigerating capacity of the air refrigerating mode is smaller than the cold load, but the refrigerating capacity of the water refrigerating mode is larger than the cold load, selecting the water refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is smaller than the cold load and the refrigerating capacity of the water refrigerating mode is also smaller than the cold load, selecting an air-water combined refrigerating mode;
s5, calculating the refrigerating capacity of the air refrigerating mode; judging whether the calculated refrigerating capacity of the air refrigerating mode is larger than a cold load or not, and if so, selecting the air refrigerating mode; if not, operating the air-water combined refrigeration mode;
s6, judging whether the building needs to accurately control the indoor humidity, namely whether the air conditioning system of the building is a technical air conditioning system, if so, turning to S5; if not, calculating the refrigerating capacity of the water refrigerating mode, and if the calculated refrigerating capacity of the water refrigerating mode is greater than the cold load, selecting the water refrigerating mode; and if the calculated refrigerating capacity of the water refrigerating mode is less than the cold load, operating the air-water combined refrigerating mode.
The invention has the beneficial effects that:
(1) the refrigeration system provided by the invention only needs the ground heat exchanger, the direct contact heat exchanger and related auxiliary equipment, is simple and compact, is simple and convenient to use, and solves the problem of huge conventional refrigeration systems compared with the conventional refrigeration method. In addition, the system makes full use of renewable energy geothermal energy and air energy, and meanwhile, the system only needs energy consumption of a water pump and a fan, and the indoor refrigeration requirement of the building can be met. In addition, the parameters of the air and the water can be adjusted by changing the flow of the air and the water, and the indoor temperature and humidity of the building can be adjusted by using low-temperature dry and cold air and low-temperature water, namely the indoor refrigeration requirement of the building is met. The refrigeration method is an economical, energy-saving and nearly 'free' system for solving the refrigeration requirement of buildings in summer by utilizing renewable energy.
(2) The refrigeration system provided by the invention can realize building refrigeration and dehumidification, can meet the requirement of indoor fresh air, and can remove indoor heat and humidity loads by mainly utilizing renewable energy sources such as geothermal energy of soil, air energy of outdoor air and the like. Compared with the traditional refrigeration system, the refrigeration system disclosed by the invention not only can better meet the actual application requirements, but also is green and environment-friendly in the operation process.
(3) The control method of the refrigeration system provided by the invention is characterized in that on the basis of collecting the building and the load parameters, the external meteorological parameters, the system operation data and the equipment parameters thereof, the control strategy is jointly formulated by adopting the parameters such as equipment energy efficiency, system energy efficiency, accumulated cold quantity, temperature difference and operation time. Compared with the control strategy of the traditional refrigeration system which controls by adopting temperature, temperature difference or running time, the control strategy of the refrigeration system is more scientific and accurate, and the high-efficiency and energy-saving running of the system can be realized.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the air cooling mode of the system;
FIG. 3 is a schematic diagram of the water cooling mode of the system;
FIG. 4 is a schematic view of the combined air and water cooling mode of the system;
FIG. 5 is a logic diagram of the present system operational control;
FIG. 6 is a schematic diagram of an existing ground source heat pump system;
fig. 7 is a schematic diagram of the system retrofit based on an existing ground source heat pump system;
in the figure, the heat exchanger comprises a ground heat exchanger 1, a second stop valve 2, a water distributor 3, a water distributor 4, a first stop valve 5, a first variable frequency water pump 6, a direct contact heat exchanger 7, a water collector 8, an air pipe 9, a diffuser 10, a fan coil 11, a second variable frequency water pump 12, a control device 13, a third variable frequency water pump 14 and a ground source heat pump host.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
For deep soil, the soil temperature generally remains unchanged throughout the year. In the cooling season of the building, the outdoor air temperature and the air humidity at the place of the building are higher, the corresponding air dew point temperature is also higher, and in addition, compared with the deep soil temperature at the place of the building, the air dew point temperature is usually higher than the deep soil temperature. After water fully exchanges heat with deep soil through the buried pipe heat exchanger, the outlet water temperature of the buried pipe heat exchanger is lower than the dew point temperature of outdoor air, the outlet water at the temperature exchanges heat and mass with the outdoor air through the direct contact type heat exchanger, because the water temperature is lower than the air temperature, the temperature of the air after heat and mass exchange is reduced, meanwhile, because the water temperature is lower than the dew point temperature of the air, water vapor in the air can be condensed into the water, so that the humidity of the air is reduced, namely, the outdoor air becomes dry and cold air, the temperature of the water is increased simultaneously, further, the outlet air temperature and the outlet air humidity of the direct contact type heat exchanger can be accurately controlled by controlling the air quantity and the water quantity entering the direct contact type heat exchanger. And the water after temperature rise flows back to the ground heat exchanger to exchange heat with the soil, and the water after temperature rise exchanges heat and mass with the air through the direct contact heat exchanger after temperature reduction, and the process is circulated. Therefore, the preparation of dry and cold air can be realized through the ground heat exchanger and the direct contact heat exchanger, and the preparation of low-temperature water can also be realized independently.
The dry and cold air prepared by the method is sent into the room through the air pipe and the air diffuser, so that fresh air can be provided indoors, the indoor fresh air quantity requirement is realized, meanwhile, the indoor humidity can be adjusted, and the indoor temperature can be properly adjusted. The prepared low-temperature water is sent into an indoor fan coil to realize indoor temperature regulation, if the water temperature is lower than the dew point temperature of indoor air, the indoor air humidity can be regulated through condensation and dehumidification, and if the water temperature is lower than the indoor air temperature but higher than the dew point temperature of the indoor air, the indoor temperature can be regulated only. The water temperature entering the fan coil can be controlled and adjusted by reasonably controlling the water flow entering the ground heat exchanger. The temperature, humidity and flow of air entering the air diffuser can be controlled and adjusted by reasonably controlling the water flow and the air flow entering the direct contact type heat exchanger.
Based on the principle, the system for realizing building refrigeration by only utilizing geothermal energy and air energy is designed as shown in fig. 1 and comprises a ground heat exchanger 1, a direct contact heat exchanger 6, a fan coil 10, an air pipe 8, an air diffuser 9 and a control device 12. In particular, the amount of the solvent to be used,
the ground heat exchanger 1 is buried in soil, the water in the ground heat exchanger 1 exchanges sensible heat with the soil through a pipe wall, and the heat transfer direction depends on the temperature of the water and the soil. In the present application, the ground heat exchanger 1 is used to produce cold water at low temperature.
The water outlet of the ground heat exchanger 1 is respectively connected with the water inlet of the direct contact heat exchanger 6 and the water inlet of the fan coil 10 through pipelines; the water inlet of the ground heat exchanger 1 is respectively connected with the water outlet of the direct contact heat exchanger 6 and the water outlet of the fan coil 10 through pipelines; therefore, the direct contact type heat exchanger 6 and the fan coil 10 are connected in parallel at two ends of the ground heat exchanger 1. The air outlet of the direct contact heat exchanger 6 is connected with a diffuser 9 through an air pipe 8. The diffuser 9 and fan coil 10 are located indoors. And the dry and cold gas after heat exchange of the direct contact type heat exchanger 6 is sent into the room by the indoor diffuser 9.
When the direct contact type heat exchanger 6 works, water is in direct contact with air to transfer heat and mass, the water and the air are subjected to sensible heat and latent heat exchange, the sensible heat transfer direction depends on the dry bulb temperature of the air and the water, the latent heat transfer depends on the moisture content of the air and the moisture content of the air near the surface of a water film, the total heat transfer direction depends on the algebraic sum of the sensible heat and the latent heat, and the air flows driven by a fan in the direct contact type heat exchanger 6.
Preferably, the water outlet of the ground heat exchanger 1 is connected with the water separator 3 through a pipeline, and the water separator 3 is respectively connected with the direct contact type heat exchanger 6 and the fan coil 10 through pipelines. The water inlet of the ground heat exchanger 1 is connected with a water collector 7 through a pipeline, and the water collector 7 is respectively connected with a direct contact type heat exchanger 6 and a fan coil 10 through pipelines. And the distribution of water supply and the collection of return water of the ground heat exchanger are realized by utilizing the water separator 3 and the water collector 7.
Preferably, a first stop valve 4 and a first variable frequency water pump 5 are arranged on a pipeline between the water separator 3 and the water inlet of the direct contact type heat exchanger 6; and a second stop valve 2 and a second variable frequency water pump 11 are arranged on a pipeline between the water separator 3 and the water inlet of the fan coil 10. The low-temperature cold water prepared by the ground heat exchanger 1 is respectively sent to the fan coil 10 by the second variable frequency water pump 11 and sent to the direct contact heat exchanger 6 by the first variable frequency water pump 5. The first variable frequency water pump 5 and the second variable frequency water pump 11 utilize a frequency converter to change the rotating speed of the water pumps, and further adjust the flow and pressure of the water pumps.
Preferably, the system is also provided with measuring equipment, and the measuring equipment comprises a temperature probe, a flow probe, a humidity probe, an electric energy measuring instrument and the like. Specifically, a water inlet and a water outlet of the ground heat exchanger 1 are respectively provided with a temperature probe, and a water outlet of the ground heat exchanger 1 is provided with a flow probe. The water inlet pipeline and the water outlet pipeline of the direct contact type heat exchanger 6 are both provided with temperature probes, and the water outlet pipeline of the direct contact type heat exchanger 6 is provided with a flow probe. The water inlet pipeline and the water outlet pipeline of the fan coil 10 are both provided with temperature probes, and the water outlet pipeline of the fan coil 10 is provided with a flow probe. And a temperature probe and a flow probe are arranged at an air outlet of the direct contact type heat exchanger 6. Air outlets of the air diffuser 9 are all provided with an air speed probe, a temperature probe and a humidity probe. The direct contact type heat exchanger 6, the first variable frequency water pump 5 and the second variable frequency water pump 11 are all provided with an electric energy measuring instrument. The temperature probe, the humidity probe, the flow probe, the wind speed probe and the electric energy measuring instrument are in signal connection with the control equipment 12; in addition, the electric equipment such as the electric control valve, the direct contact type heat exchanger 6, the fan coil 10 and the pump in the system are respectively connected with the control equipment 12 through signals. And measuring equipment is also arranged in the external environment and the indoor environment of the system, and the measuring equipment comprises a temperature probe and a humidity probe which are also respectively connected with the control equipment 12 through signals.
Preferably, the pipeline of the system can be also provided with a one-way valve, an electromagnetic valve, a flexible connection, a dirt remover and the like.
Preferably, the control device 12 may be a computer or an electronic control system, and the control device 12 includes a calculation model module, a data acquisition and storage module, a data processing module, a criterion forming module, and an execution module. Wherein the content of the first and second substances,
(1) a calculation model module: the method comprises a heat exchanger thermal calculation model and a system energy efficiency calculation model.
And (1.1) the thermal calculation model comprises a thermal calculation model of the ground heat exchanger and a thermal calculation model of the direct contact heat exchanger.
(1.1.1) the direct contact type heat exchanger thermal calculation model is used for calculating the water temperature, the dry and cold air humidity and each heat exchange quantity (including sensible heat exchange quantity, latent heat exchange quantity and total heat exchange quantity) of the direct contact type heat exchanger after heat exchange according to the heat exchanger parameters (such as filler size, space, material and the like), the temperature, humidity and flow of outdoor air, the temperature and flow of cold water prepared by the buried pipe heat exchanger and the like. The direct contact type heat exchanger thermal calculation model can refer to: (Y.Huang, F.Ge, C.Wang, Z.Hu, Numerical study on the Heat and Mass Transfer characteristics of the open-type cross-flow Heat-source power at low aggregate temperature, International Journal of Heat and Mass Transfer145(2019)118756 ], and [ fastening Hu, Shuwen g, Yufei Huang, Fenghua Ge, Young Wang.Heat storage characteristics of adaptation and maintenance of Heat source in thermal Mass of ground aggregate of concrete source power and 110752 ]; the disclosed method is set up.
(1.1.2) the thermal calculation model of the buried pipe heat exchanger is used for calculating the outlet water temperature and the heat exchange capacity (sensible heat exchange capacity) of the buried pipe heat exchanger in the heat exchange process according to the deep soil temperature, the structural parameters and the arrangement parameters of the buried pipe, the soil thermophysical parameters, the water inlet temperature, the water inlet flow and the like. The heat transfer problem research and the engineering application of the geothermal heat exchanger [ D ], Qinghua university, 2005] can be referred to for a thermodynamic calculation model of the geothermal heat exchanger [ Wangyong, Li Wenxin, Fuxiang encourage, Liuyong ] the theory and practice of the geothermal heat pump system of the geothermal pipe with the geothermal sources [ M ], Chinese architecture industry Press, 2021] and [ Pannairen ]; the disclosed method is set up.
And (1.2) calculating the energy efficiency of the system according to the energy consumption of conveying equipment such as a fan and a water pump of the system and the achievable system refrigerating capacity. The Energy efficiency of the system is also a calculation routine in the art, and can be found in particular in [ Zicheng Hu, Shuwen Geng, Wanfeng Li, Fenghua Ge, Xiaoyuan Liu. study on soil heat storage performance and operation protocol of new integrated HST-GSHP system in differential code regions, Energy & building 256(2022)111748 ].
(2) The data acquisition and storage module: the module is connected with each electric device and the measuring device of the system through signal lines, so that the starting and stopping states of each device (such as a variable frequency water pump, a direct contact type heat exchanger 6 and other devices) can be collected and stored, the temperature, humidity, flow and flow rate of air and water at each position in the system, the power consumption and electric energy of the devices are recorded, and data such as structure parameters of the heat exchanger are recorded.
(3) A data processing module: based on the collected and stored data, calling a calculation model of a calculation model module, and respectively calculating real-time and accumulated sensible heat exchange quantity, latent heat exchange quantity and total heat exchange quantity (equal to sensible heat and latent heat) in the heat and mass exchange process of water and air in the direct contact type heat exchanger 6; and the real-time accumulated sensible heat exchange quantity in the process of heat exchange between water and soil in the ground heat exchanger 1;
real-time and accumulated power consumption electric energy of a fan and a water pump; measured directly by an electric energy meter.
Real-time refrigerating capacity of a user side; the refrigerating capacity comprises air refrigerating mode refrigerating capacity, water refrigerating mode refrigerating capacity and air-water combined refrigerating mode refrigerating capacity; the water refrigeration mode refrigerating capacity can be calculated based on the temperature and the flow of water supply and return water of user terminal equipment (fan coil) and the self-cooling performance coefficient (performance parameter provided by equipment manufacturers) of the fan coil; calculating the refrigerating capacity of an air outlet refrigerating mode according to the temperature of dry and cold air at the outlet of the direct contact type heat exchanger, the humidity of the dry and cold air, the flow of the dry and cold air, the indoor temperature and the indoor humidity; the air-water combined refrigeration mode refrigerating capacity is the sum of the air refrigeration mode refrigerating capacity and the water refrigeration mode refrigerating capacity of combined operation.
The refrigerating capacity corresponding to each mode is a conventional calculation method in the field, and can refer to the methods disclosed by [ Zhao Rongyi, Van Bao, Xue Hua, Qian Ming, air conditioning [ M ], Chinese construction industry Press, 2008] and [ Lianzhi, Chengbaoming ], heat and mass exchange principle and equipment [ M ], Chinese construction industry Press, 2018 ].
Real-time and cumulative system performance values in various operating modes. The system energy efficiency value is the ratio of the refrigeration capacity realized in the running mode to the total electric energy consumed by the system power consumption equipment.
(4) A criterion forming module: and comparing the data obtained by the calculation model module, the data acquisition and storage module and the data processing module with a preset value to form a criterion for the system to execute the running mode.
The set points include indoor design parameters and load requirements. The indoor design parameters comprise indoor air temperature, indoor air humidity, fresh air volume and the like; the load requirements comprise a cold load, a fresh air load and a wet load. Considering the standard value of indoor air quality, to the travelling comfort air conditioner, summer air conditioner design parameter does: the standard value of indoor temperature is 22-28 deg.C, air humidity is 40-80%, and fresh air volume is 30m 3 V (man h); for a technical air conditioner, taking the design specification of a clean factory as an example, the design parameters of the air conditioner in summer are as follows: the standard value of the clean room temperature is 24-26 ℃, the air humidity is 50-70%, and the humidity control precision is within 5%. The fresh air load is whether the building has fresh air demand or not; the humidity load is the requirement of whether the building has the humidity load, and the precision requirement is set for the humidity control of a technical air conditioner, which belongs to the situation of the precision control of the humidity requirement; the cold load is determined by the building envelope and the heat dissipation of the indoor heat source. The specific calculation method of the load demand refers to: [ Lujun, Ma very beautiful, Zhou Hua, Warm and ventilating air conditioner [ M]The Chinese architecture industry Press, 2015]And the relevant standards of the current country and the current place.
The specific criteria for the system operation control logic refer to the decision process of fig. 5.
(5) An execution module: and according to the criterion obtained by the criterion forming module, the operation control and switching of the system operation mode are completed by controlling the closing and opening of the valve and the working and starting and stopping of the equipment.
The operation modes of the system comprise an air refrigeration mode, a water refrigeration mode and an air-water combined refrigeration mode; the system realizes the switching of different operation modes through the closing and the opening of the valve, and the operation of the system under the three modes is described in the following with the combination of the attached figures 2-4:
(1) air cooling mode
As shown in fig. 2, in the air cooling mode, all the low-temperature cold water produced by the ground heat exchanger 1 is sent to the direct contact heat exchanger 6 to produce dry cold air. At the moment, the second stop valve 2 is closed, the first stop valve 4 is opened, low-temperature cold water prepared by the buried pipe heat exchanger 1 passes through the water separator 3 and then is pumped into the direct contact type heat exchanger 6 by the first variable frequency water pump 5, the water is subjected to heat and mass exchange with air in the direct contact type heat exchanger 6 and then flows out, and the water flows back to the buried pipe heat exchanger 1 through the water collector 7, so that the waterway circulation is completed. Outdoor air enters the direct contact type heat exchanger 6, the air and low-temperature cold water in the direct contact type heat exchanger 6 are subjected to heat and mass exchange to prepare dry and cold air, and the dry and cold air is sent to the air diffuser 9 through the air pipe 8 and then sent into a room to realize refrigeration.
(2) Water cooling mode
As shown in fig. 3, in the water cooling mode, the low temperature cold water produced by the ground heat exchanger 1 is not fed into the direct contact heat exchanger 6, but is fed into the user end fan coil 10. At the moment, the first stop valve 4 is closed, the second stop valve 2 is opened, the low-temperature cold water produced by the buried pipe heat exchanger 1 passes through the water separator 3 and then is pumped into the fan coil 10 at the user end by the second variable-frequency water pump 11, and the water flows out of the fan coil 10 and then flows back to the buried pipe heat exchanger 1 through the water collector 7, so that the waterway circulation is completed. The indoor air is indirectly contacted with the low-temperature cold water of the fan coil 10, so that the heat exchange process is completed, and the indoor refrigeration requirement is met.
(3) Wind and water combined refrigeration mode
As shown in fig. 3, in the air-water combined refrigeration mode, a part of the low-temperature cold water produced by the ground heat exchanger 1 is sent to the direct contact heat exchanger 6 to produce dry cold air, and the other part is sent to the user terminal fan coil 10. At the moment, the first stop valve 4 and the second stop valve 2 are both opened, after low-temperature cold water prepared by the buried pipe heat exchanger 1 passes through the water separator 3, one part of the low-temperature cold water is pumped into the direct contact type heat exchanger 6 by the first variable frequency water pump 5, the water flows out after heat and mass exchange with air in the direct contact type heat exchanger 6, the other part of the low-temperature cold water is pumped into the fan coil 10 by the second variable frequency water pump 11, the water flows out from the fan coil 10, and the return water flows back to the buried pipe heat exchanger 1 after being collected in the water collector 7, so that the water path circulation is completed. The dry and cold air produced by the direct contact heat exchanger 6 is sent into the room through the air pipe 8 and the air diffuser 9, a part of low-temperature cold water produced by the ground heat exchanger 1 is sent into the fan coil 10, and the air and the water jointly refrigerate the room.
A method for realizing building refrigeration control by only utilizing geothermal energy and air energy comprises the following steps:
s1, presetting each set value, wherein the set values comprise indoor design parameters and load requirements; the indoor design parameters comprise indoor air temperature, indoor air humidity, fresh air volume and the like; the load requirements comprise cold load, fresh air load and wet load;
s2, collecting outdoor parameters of the building, such as outdoor air temperature, air moisture content, air relative humidity and the like;
s3, judging whether the building has a fresh air demand; if the building has no fresh air demand, the step is switched to S4, and if the building has the fresh air demand, the step is switched to S5;
s4, judging whether the building has a wet load demand, and turning to S6 if the building has the wet load demand; if the building has no wet load requirement, calling a thermal calculation model and a system energy efficiency calculation model of the heat exchange equipment, and respectively calculating the refrigerating capacity and the system energy efficiency of an air refrigerating mode and the refrigerating capacity and the system energy efficiency of a water refrigerating mode;
and respectively judging the magnitude relation between the refrigerating capacity and the refrigerating load of the two modes based on the calculated refrigerating capacity of the two modes. Firstly, judging whether the refrigerating capacity of an air refrigerating mode is larger than a cold load, judging whether the refrigerating capacity of a water refrigerating mode is larger than the cold load if the refrigerating capacity of the air refrigerating mode is larger than the cold load, judging whether the system energy efficiency of the water refrigerating mode is larger than the system energy efficiency of the air refrigerating mode if the refrigerating capacity of the water refrigerating mode is larger than the cold load, and selecting the water refrigerating mode if the system energy efficiency of the water refrigerating mode is larger than the system energy efficiency of the air refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is larger than the cold load, but the refrigerating capacity of the water refrigerating mode is smaller than the cold load, selecting the air refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is larger than the cold load, the refrigerating capacity of the water refrigerating mode is also larger than the cold load, but the system energy efficiency of the water refrigerating mode is smaller than that of the air refrigerating mode, the air refrigerating mode is selected;
if the refrigerating capacity of the air refrigerating mode is smaller than the cold load, but the refrigerating capacity of the water refrigerating mode is larger than the cold load, selecting the water refrigerating mode;
and if the refrigerating capacity of the air refrigerating mode is smaller than the cold load and the refrigerating capacity of the water refrigerating mode is also smaller than the cold load, selecting the air-water combined refrigerating mode.
The system energy efficiency of the water refrigeration mode is the system energy efficiency of the system in the water refrigeration mode; the system energy efficiency of the wind cooling mode is the system energy efficiency of the system in the wind cooling mode.
S5, calling a thermotechnical calculation model of the heat exchange equipment, and calculating the refrigerating capacity of the air refrigeration mode; judging whether the calculated refrigerating capacity of the air refrigerating mode is larger than a cold load or not, and if so, selecting the air refrigerating mode; and if not, operating the air-water combined refrigeration mode.
S6, judging whether the building needs to accurately control the indoor humidity (namely whether the building is a technical air conditioning system), if so, turning to S5; if not, calling a thermodynamic calculation model of the heat exchange equipment, calculating the refrigerating capacity of the water refrigerating mode, and if the calculated refrigerating capacity of the water refrigerating mode is greater than the cold load, selecting the water refrigerating mode; and if the calculated refrigerating capacity of the water refrigerating mode is less than the cold load, operating the air-water combined refrigerating mode.
Based on the above description of the control method, the method selects the corresponding operation mode according to the building load requirement, and specifically comprises the following steps:
(1) when the building has a fresh air demand, no matter whether there is a wet load demand, the air cooling mode is used. Then judging whether the air refrigeration mode meets the requirement of removing the sensible heat load of the building, and if so, only operating the air refrigeration mode; and if the water cooling mode is not satisfied, the water cooling mode is used for assisting cooling, and the wind-water combined cooling mode is operated.
(2) When the building has no fresh air requirement, a wet load requirement and the indoor humidity needs to be accurately controlled, operating the air cooling mode, judging whether the air cooling mode meets the requirement of removing the heat in the building, and only operating the air cooling mode if the air cooling mode meets the requirement; and if the air-water combined refrigeration mode is not satisfied, the water refrigeration mode is used for assisting refrigeration, and the air-water combined refrigeration mode is operated.
(3) When the building has no fresh air requirement and has a moisture load requirement but does not need to accurately control the indoor humidity, the water refrigeration mode is operated, then whether the water refrigeration mode meets the removal of the sensible heat in the building or not is judged, and if the water refrigeration mode meets the removal of the sensible heat in the building, the water refrigeration mode is operated; and if the air cooling mode is not met, the air cooling mode is used for assisting cooling, and the air-water combined cooling mode is operated.
(4) When the building has neither fresh air requirement nor wet load requirement, judging the refrigerating capacity which can be realized by the air refrigerating mode and the water refrigerating mode respectively, and if only one of the air refrigerating mode and the water refrigerating mode can meet the building cold load requirement, operating the other one of the air refrigerating mode and the water refrigerating mode; if the two meet the building cold load requirement, judging the system energy efficiency of the two refrigeration modes, and selecting the refrigeration mode with high system energy efficiency to operate; and if the air-water combined refrigeration mode does not meet the refrigeration requirement of the building, the air-water combined refrigeration mode is operated.
The system and the control method for building refrigeration can be used for constructing a full refrigeration system on a building without using a ground source heat pump system, and can also be used for reconstructing a building using the ground source heat pump system. This will be explained below.
Example 1 construction of a Total refrigeration System in a building that did not use ground Source Heat Pump System
Taking office buildings in certain northern areas as an example, specific parameters of the office buildings are shown in a table 1:
TABLE 1 specific parameters of a certain office building
1. Refrigeration system design
1.1, designing the buried pipe type, the drilling depth, the spacing, the pipe diameter parameters of the buried pipe heat exchanger and the direct contact type heat exchanger according to the building data and the design parameters (can refer to the method recorded in the references [ Wangyong, Liwenxin, auspicious encourage, Liuyong, buried pipe ground source heat pump system theory and practice [ M ], Chinese building industry publisher, 2021] and [ Lianwei, Chenbaoming, heat and mass exchange principle and equipment [ M ], Chinese building industry publisher, 2018 ]).
1.2, according to the meteorological parameter, building data and the design parameter of the place where the building is located, through the flow of adjusting direct contact heat exchanger and buried pipe heat exchanger, the temperature of water or air outlet air temperature of measuring equipment export makes the temperature between indoor air dew point temperature and dry bulb temperature to reach the requirement that can dehumidify indoor.
1.3, the ground heat exchanger, the direct contact heat exchanger, the corresponding water separator, the water collector, the first circulating water pump, the second circulating water pump, the corresponding test equipment, the corresponding accessories and the like form a refrigerating system. As shown in fig. 1.
2. Refrigerant system operation and control strategy development
The office building of the specific embodiment belongs to a high-density population building, and has high requirements on ventilation and dehumidification. When the refrigerating system is started, the control equipment acquires parameters such as outdoor temperature, humidity and the like. Since the office Building belongs to a comfortable air conditioning system, requirements on fresh air and dehumidification are met, but humidity does not need to be accurately controlled, the refrigeration system preferentially operates an air refrigeration mode to bear requirements on indoor fresh air and dehumidification, and invokes a thermal calculation model (such as documents [ y.huang, f.ge, c.wang, z.hu, Numerical study on the Heat and Mass Transfer characteristics of the open-type cross-flow Heat-source top low air aggregate thermal, International Journal of Heat and Mass Transfer145(2019)118756 ]) and documents [ fastening Hu, Shuwen gen g, yufeifei Huang Ge, fastening wa, wang.heat storage and refrigeration, and application of Heat and moisture) so as to judge whether the air refrigeration model can only operate in the air refrigeration mode and the air refrigeration mode (2021) and judge whether the air refrigeration model can meet the requirements on the Heat-type refrigeration and moisture absorption and humidity of the Heat refrigeration load; if the refrigerating capacity which can be realized by the air refrigerating mode is larger than the cold load of the building, the air refrigerating mode is operated, otherwise, the air-water combined refrigerating mode is operated.
Example 2 improvement of refrigeration System in a building Using ground Source Heat Pump System
Taking an office building in a certain northern area as an example, specific parameters of the office building and a ground heat exchanger thereof are as shown in a table 2:
TABLE 2 specific parameters of certain office building and ground heat exchanger
1. Refrigeration system design
1.1, designing a direct contact type heat exchanger according to building data and design parameters of an existing ground heat exchanger; (the design methods can be described in references [ Y.Huang, F.Ge, C.Wang, Z.Hu, Numerical study on the Heat and Mass Transfer characteristics of the open-type cross-flow Heat-source lower-inlet-aggregate temperature, International Journal of Heat and Mass Transfer145(2019)118756 ], in the following [ Zichen Hu, Shuwen Geng, Yufei Huang, Fenghua Ge, Yucheng
1.2, according to the meteorological parameters, the building data and the design parameters of the place where the building is located, the water temperature at the outlet of the buried pipe heat exchanger and the air temperature at the air outlet of the direct-contact heat exchanger are measured by adjusting the flow of the direct-contact heat exchanger and the flow of the buried pipe heat exchanger, so that the temperature is between the dew point temperature of indoor air and the dry bulb temperature, and the requirement of indoor dehumidification is met.
1.3, existing ground source heat pump system for building, as shown in fig. 6. The buried pipe heat exchanger, the water separator, the water collector, the second variable frequency water pump and the fan coil in fig. 1 are all existing, and only the first stop valve, the first variable frequency water pump, the direct contact heat exchanger, the air pipe, the air diffuser and the control device need to be added to the existing ground source heat pump system shown in fig. 6.
And 1.4, assembling the first stop valve, the first variable frequency water pump, the direct contact heat exchanger, the air pipe, the air diffuser and corresponding control test equipment and accessories thereof on the existing ground source heat pump system through pipelines to form the modified refrigerating system, wherein the components are shown in fig. 7.
2. Refrigerant system operation and control strategy development
For the transformation of the existing ground source heat pump system, the transformed existing heat pump host does not operate in the cooling season, the transformed system for realizing the building cooling only utilizes the geothermal energy and the air energy to operate to realize the building cooling requirement, and the operation and control strategy is the same as the operation and control strategy of the specific implementation 1, so the details are not repeated.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (10)
1. A system for cooling a building using only geothermal energy and air energy, comprising:
a ground heat exchanger (1);
the direct contact type heat exchanger (6) is connected with the ground heat exchanger (1), and a loop is formed between the direct contact type heat exchanger (6) and the ground heat exchanger (1) through a pipeline;
a diffuser (9) connected to the direct contact heat exchanger (6); the air diffuser (9) is connected with the direct contact type heat exchanger (6) through an air pipe (8);
the fan coil (10) is connected with the ground heat exchanger (1), and a loop is formed between the ground heat exchanger (1) and the fan coil (10) through a water pipeline;
the air diffuser (9) and the fan coil (10) are arranged indoors.
2. The system for realizing building refrigeration by using only geothermal energy and air energy as claimed in claim 1, wherein the outlet of the ground heat exchanger (1) is connected with the direct contact type heat exchanger (6) and the fan coil (10) through the water separator (3), and the inlet of the ground heat exchanger (1) is connected with the direct contact type heat exchanger (6) and the fan coil (10) through the water collector (7).
3. The system for realizing the refrigeration of the building only by using the geothermal energy and the air energy as claimed in claim 1, characterized in that a stop valve and a variable frequency water pump are respectively arranged on the pipelines of the outlet of the ground heat exchanger (1) connected with the direct contact type heat exchanger (6) and the fan coil (10).
4. The system of claim 1, wherein the ground heat exchanger, the direct contact heat exchanger, the fan coil and the air diffuser are all provided with temperature probes on inlet side pipelines, flow probes on outlet side pipelines, humidity probes on outlet sides of the direct contact heat exchanger, the fan coil and the air diffuser, and the direct contact heat exchanger and the fan coil are also provided with electric energy measuring instruments.
5. The system for realizing the refrigeration of the building by using only the geothermal energy and the air energy as claimed in claim 1, wherein measuring devices are also arranged in the external environment and the indoor environment of the system, and the measuring devices comprise a temperature probe and a humidity probe.
6. The system for realizing the refrigeration of the building by only utilizing the geothermal energy and the air energy is characterized by further comprising a control device (12), wherein the control device (12) is connected with a measuring device, a stop valve, a variable frequency water pump, a direct contact type heat exchanger (6), a fan coil (10) and a diffuser (9) through signal lines; on one hand, the system operation data is collected, and on the other hand, the work start and stop of each electric device are controlled.
7. System for building cooling using geothermal energy and air energy only, according to claim 1, characterized in that the control device (12) comprises a calculation model module, a data acquisition and storage module, a data processing module, a criterion formation module, an execution module, wherein,
the calculation model module calculates the heat exchange quantity and the system energy efficiency according to the collected system operation data, the collected environment data and the design parameters of the direct contact type heat exchanger (6) and the ground heat exchanger (1);
the data acquisition and storage module is used for acquiring and storing system operation data, environment data and the start-stop state of equipment in the system;
the data processing module calls a calculation model module based on the data of the acquisition and storage module, and calculates the real-time and accumulated heat exchange amount of the direct contact heat exchanger (6) and the ground heat exchanger (1) respectively; calculating the system energy values of refrigerating capacity, real time and accumulation;
the criterion forming module compares the data obtained by the calculation model module, the data acquisition and storage module and the data processing module with a preset value to form a criterion of a system execution operation mode; the set points include indoor design parameters and load requirements.
8. The system for cooling a building using only geothermal energy and air energy according to claim 7, wherein the indoor design parameters include indoor air temperature, indoor air humidity, fresh air volume, etc.; the load requirements include cold load requirements, fresh air load requirements, and wet load requirements.
9. A system for the cooling of buildings using geothermal energy and air energy only, as in claim 1, characterized in that the direct contact heat exchanger (6) works alternatively to the fan coil (10) or simultaneously; the branch where the direct contact type heat exchanger (6) is located is in an air refrigeration mode when working independently, the branch where the fan coil (10) is located is in a water refrigeration mode when working independently, and the branch where the direct contact type heat exchanger (6) is located and the branch where the fan coil (10) is located are in an air and water combined refrigeration mode when working simultaneously.
10. A control method of the system for cooling a building using only geothermal energy and air energy according to claim 9, comprising the steps of:
s1, presetting each set value, wherein the set values comprise indoor design parameters and load requirements; the indoor design parameters comprise indoor air temperature, indoor air humidity, fresh air volume and the like; the load requirements comprise cold load requirements, fresh air load requirements and wet load requirements;
s2, collecting outdoor parameters of the building, such as outdoor air temperature, air moisture content, air relative humidity and the like;
s3, judging whether the building has a fresh air demand; if the building has no fresh air demand, switching to S4, and if the building has fresh air demand, switching to S5;
s4, judging whether the building has a wet load demand, and turning to S6 if the building has the wet load demand; if the building has no wet load requirement, calling a thermal calculation model and a system energy efficiency calculation model of the heat exchange equipment, and respectively calculating the refrigerating capacity and the system energy efficiency of an air refrigerating mode and the refrigerating capacity and the system energy efficiency of a water refrigerating mode; (ii) a
Respectively judging the magnitude relation between the refrigerating capacity of the two modes and the building refrigerating load based on the calculated refrigerating capacity of the two modes; firstly, judging whether the refrigerating capacity of an air refrigerating mode is larger than a cold load, judging whether the refrigerating capacity of a water refrigerating mode is larger than the cold load if the refrigerating capacity of the air refrigerating mode is larger than the cold load, judging whether the system energy efficiency of the water refrigerating mode is larger than the system energy efficiency of the air refrigerating mode if the refrigerating capacity of the water refrigerating mode is larger than the cold load, and selecting the water refrigerating mode if the system energy efficiency of the water refrigerating mode is larger than the system energy efficiency of the air refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is larger than the cold load, but the refrigerating capacity of the water refrigerating mode is smaller than the cold load, selecting the air refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is larger than the cold load, the refrigerating capacity of the water refrigerating mode is also larger than the cold load, but the system energy efficiency of the water refrigerating mode is smaller than that of the air refrigerating mode, the air refrigerating mode is selected;
if the refrigerating capacity of the air refrigerating mode is smaller than the cold load, but the refrigerating capacity of the water refrigerating mode is larger than the cold load, selecting the water refrigerating mode;
if the refrigerating capacity of the air refrigerating mode is smaller than the cold load and the refrigerating capacity of the water refrigerating mode is also smaller than the cold load, selecting an air-water combined refrigerating mode;
s5, calculating the refrigerating capacity of the air refrigerating mode; judging whether the calculated refrigerating capacity of the air refrigerating mode is larger than a cold load or not, and if so, selecting the air refrigerating mode; if not, operating the air-water combined refrigeration mode;
s6, judging whether the building needs to accurately control the indoor humidity, namely whether the air conditioning system of the building is a technical air conditioning system, if so, turning to S5; if not, calculating the refrigerating capacity of the water refrigerating mode, and if the calculated refrigerating capacity of the water refrigerating mode is greater than the cold load, selecting the water refrigerating mode; and if the calculated refrigerating capacity of the water refrigerating mode is less than the cold load, operating the air-water combined refrigerating mode.
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