CN111649421A - Intermittent cold accumulation air conditioning system and method based on building structure - Google Patents
Intermittent cold accumulation air conditioning system and method based on building structure Download PDFInfo
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- CN111649421A CN111649421A CN202010542474.4A CN202010542474A CN111649421A CN 111649421 A CN111649421 A CN 111649421A CN 202010542474 A CN202010542474 A CN 202010542474A CN 111649421 A CN111649421 A CN 111649421A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F24F5/001—Compression cycle type
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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
- F24F2005/0032—Systems storing energy during the night
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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
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Abstract
The invention discloses an intermittent cold accumulation air-conditioning system and method based on a building structure, which belong to the field of air-conditioning cold accumulation and can solve the problems that the existing building structure air-conditioning system needs to be provided with a cold accumulation water tank or an ice storage tank and other devices to occupy larger field space and is not energy-saving, the requirement on a refrigerating unit is high, and the realization and control of different functions of cold accumulation, cold supply and cold release are complicated; the refrigeration unit is communicated with a cold source through a first circulation pipeline, the refrigeration unit is communicated with a radiation heat exchanger in a building structure through a fourth circulation pipeline, the first circulation pipeline is communicated with the plate heat exchanger through a second circulation pipeline, and the fourth circulation pipeline is communicated with the plate heat exchanger through a third circulation pipeline; wherein the refrigerating temperature range of the refrigerating unit is 15-20 ℃.
Description
Technical Field
The invention belongs to the field of air conditioner cold accumulation, and particularly relates to an intermittent cold accumulation air conditioning system and method based on a building structure.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The inventor finds that the existing cold storage air conditioning system is mainly a water cold storage and ice cold storage system. The cold accumulation water tank or the ice storage tank and other devices are required to be arranged, so that the large field space is occupied, the water supply temperature of the cold accumulation water tank is low, the refrigeration coefficient is low, the operation cost can be saved according to the valley electricity price, the energy is not saved, and no contribution is made to emission reduction. In addition, the requirement on the refrigerating unit is high, the double-working-condition unit is generally arranged, the requirements on different chilled water temperatures of cooling in the daytime and cooling at night are met, or the cold accumulation unit is specially arranged, so that the unit cost investment is high. In addition, the realization and control of different functions of cold accumulation, cold supply and cold release are complex, and the operation management cost is increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an intermittent cold accumulation air-conditioning system and method based on a building structure, and the system can solve the problems that the existing building structure air-conditioning system needs to be provided with a cold accumulation water tank or an ice accumulation groove and other devices, occupies larger field space, is not energy-saving, has high requirement on a refrigerating unit, and is complex in realization and control of different functions of cold accumulation, cold supply and cold release.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the technical scheme of the invention provides an intermittent cold accumulation air-conditioning system based on a building structure, which comprises a refrigerating unit, a cold source, a plate heat exchanger and a radiation heat exchanger, wherein the refrigerating unit is communicated with the cold source through a first circulating pipeline, the refrigerating unit is communicated with the radiation heat exchanger in the building structure through a fourth circulating pipeline, the first circulating pipeline is communicated with the plate heat exchanger through a second circulating pipeline, and the fourth circulating pipeline is communicated with the plate heat exchanger through a third circulating pipeline; wherein the refrigerating temperature range of the refrigerating unit is 15-20 ℃.
As a further technical solution, the cold source includes a first cold source and a second cold source, and the first circulation pipeline is connected in parallel with the first cold source and the second cold source.
As a further technical scheme, the intelligent temperature and humidity monitoring system further comprises a processor, an indoor temperature and humidity monitoring element, an outdoor temperature and humidity monitoring element and a plurality of valves, wherein both the indoor temperature and humidity monitoring element and the outdoor temperature and humidity monitoring element can be communicated with the processor, and the processor can be communicated with the valves.
As a further technical scheme, the refrigerating unit comprises an evaporator, a condenser, an expansion valve and a compressor which are connected, the evaporator is communicated with a radiation heat exchanger in a building structure through a fourth circulating pipeline, and the condenser is communicated with a cold source through a first circulating pipeline.
In a second aspect, the invention further provides a building structure-based intermittent cold accumulation method, which uses the building structure-based intermittent cold accumulation air-conditioning system as described in the first aspect to supply cold to the building structure through the plate heat exchanger and the radiation heat exchanger.
As a further technical scheme, during the working hours at night, the air conditioning system stops running, chilled water is prepared by utilizing off-peak electricity to circularly cool the building structure, and cold air is stored in the building structure through a heat exchange radiator;
during working time in the daytime and abnormal working time in the morning, the indoor temperature and humidity are slightly lower, the air-conditioning refrigeration equipment is not started, and the indoor proper temperature is maintained through cold air stored in a structure, so that the indoor temperature and humidity are allowed to fluctuate within a comfortable range;
when the indoor load increases and the temperature rises above the air conditioning control point, the refrigeration unit is started.
The air conditioning system disclosed in the technical scheme of the invention can realize the transfer of air conditioning load in the daytime to a certain extent, thereby saving the operation cost and improving the refrigeration efficiency due to high water supply temperature. Meanwhile, under the condition of low temperature at night or suitable outdoor conditions, cooling water or other cold sources can be directly used for cooling, the operation of a refrigerator is not needed, and energy conservation and emission reduction are realized.
The technical scheme of the invention has the following beneficial effects:
1) in the invention, the water supply temperature is very low when the common cold accumulation air-conditioning system accumulates cold, for example, the temperature is lower than 0 ℃ when ice is accumulated, and the temperature of water accumulation is lower than the common 7 ℃, so that the refrigerating coefficient of the refrigerating machine is low and the power consumption is high when the conventional cold accumulation is carried out; in addition, in order to meet two requirements of normal use (water outlet at 7 degrees) and cold accumulation (ice accumulation at less than 0 degree), the unit should adopt a double-working-condition unit, and the equipment cost is high. The cold accumulation and supply technology provided by the invention adopts the high-temperature refrigerator, the refrigeration coefficient is high, the energy consumption is low, the water outlet temperature of the unit is the same when cold supply and cold accumulation are carried out, and the unit cost is low.
2) According to the invention, the problems that an energy storage tank is required to be arranged in the traditional cold storage air-conditioning system, the occupied area is large, the temperature of the outlet water of the cold storage working condition refrigerant is low and the like are solved, the system can adopt chilled water with the same parameters for normal cold supply and cold storage, a double-working condition refrigerating unit is not required to be arranged, the unit cost is reduced, and the investment cost of the energy storage system is saved; the energy-saving cold supply system has the advantages that cold storage and radiation cold supply are combined, the maximum possible energy-saving operation effect is realized, for the existing radiation cold supply system such as a capillary tube and the like, the operation mode combining energy storage/cold supply can be realized by adding related control measures and modification on the basis of the original system, and the system investment modification cost is low.
3) In the invention, the relatively high-temperature cooling water is adopted, and the condensation phenomenon caused by the fact that the temperature of the indoor wall surface is lower than the indoor dew point temperature can be avoided. Because the chilled water temperature is high, the radiation tail end only bears indoor sensible heat load and does not bear latent heat load. Latent heat load is born by a fresh air system, and cooling and dehumidification of the fresh air system can be realized by solution dehumidification or a low-temperature water chilling unit and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a system configuration according to one or more embodiments of the invention.
In the figure: 1. a refrigeration unit; 2. a plate heat exchanger; 3. a cooling tower; 4. other cold sources; 5. a radiant heat exchanger; 6. a chilled water circulating water pump; 7. a cooling water circulating water pump; 8. a processor; 9. a network weather monitoring element; 10. an outdoor temperature and humidity monitoring element; 11. an indoor temperature and humidity monitoring element; 12. a first valve; 13. a second valve; 14. a third valve; 15. a fourth valve; 16. a first refrigeration unit valve; 17. a first cold source valve; 18. a second refrigeration unit valve; 19. a second cold source valve; 20. a first circulation loop; 21. a second circulation line; 22. a third circulation line; 23. a fourth circulation loop.
The spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, and for example, the terms "mounted," "connected," and "fixed" may be fixed, detachable, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As introduced in the background art, the present invention provides an intermittent cold accumulation air conditioning system and method based on a building structure, which can solve the problems that the existing building structure air conditioning system needs to be provided with a cold accumulation water tank or an ice accumulation groove, etc., which occupy a larger space and do not save energy, the requirement of a refrigerating unit is high, and the realization and control of different functions of cold accumulation, cold supply and cold release are complicated.
Example 1
In a typical embodiment of the present invention, as shown in fig. 1, the present embodiment discloses an intermittent cold storage air conditioning system based on a building structure, which includes a refrigerating unit 1, a cooling tower, a chilled water supply system, a plate heat exchanger 2, an indoor temperature and humidity sensor, a central control system, and a radiant heat exchanger 5; the refrigeration system comprises a main refrigerating unit 1 formed by connecting four large parts, namely an evaporator, a condenser, an expansion valve and a compressor, wherein the evaporator is communicated with a radiation heat exchanger 5 positioned in a building structure through a chilled water supply system, and the condenser is communicated with a cooling tower through a cooling water supply system; when the system stops operating at night, the low-ebb electricity is used for preparing chilled water to circularly cool the building structure, and cold air is stored in the building structure through a heat exchange radiator; during working hours in the daytime, the indoor temperature and humidity are slightly lower during morning work, the air-conditioning refrigeration equipment is not started, the indoor proper temperature is maintained through cold air stored in the structure, and the indoor temperature and humidity are allowed to fluctuate within a comfortable range; when the indoor load is increased and the cold storage air is exhausted, the temperature is raised to be above the control point of the air conditioner, and then the air conditioning equipment is started.
In this embodiment, the cooling tower serves as a heat dissipation source of the refrigeration unit 1, and at the same time, the cooling tower can serve as a cooling cold source when the temperature is appropriate, and other cold sources connected in parallel with the cooling tower can also achieve the above functions, and the other cold sources can adopt various resource forms such as a soil source and a water source according to local resources.
The refrigerating unit 1 adopts a high-temperature type refrigerating unit 1, and when the radiation heat exchanger 5 adopts a capillary tube disc, the water supply temperature of the capillary tube is adapted, and the requirements of cooling in the daytime and energy storage at night can be met.
The air conditioning system disclosed in the embodiment can realize the transfer of air conditioning load in the daytime to a certain extent, thereby saving the operation cost and improving the refrigeration efficiency due to high water supply temperature. Meanwhile, under the condition of low temperature at night or suitable outdoor conditions, cooling water or other cold sources 4 can be directly used for cooling, a refrigerator is not needed to operate, and energy conservation and emission reduction are achieved.
The embodiment solves the problems that the traditional cold accumulation air-conditioning system needs to be provided with an energy storage tank, occupies a large area, and has low cold accumulation working condition refrigerant effluent temperature and the like. In the embodiment, the normal cold supply and cold accumulation can adopt chilled water with the same parameters, a double-working-condition refrigerating unit is not required to be arranged, the unit cost is reduced, and the investment cost of an energy storage system is saved; the cold accumulation and the radiation cold supply system are combined, and the maximum possible energy-saving operation effect is realized. For the existing radiation cooling system such as capillary, the related control measures and transformation can be added on the basis of the original system to realize the operation mode combining energy storage and cooling, and the investment and transformation cost of the system is low.
For the traditional air conditioning system and the traditional cold accumulation air conditioning system, the temperature of the chilled water entering the evaporator is generally 7-12 ℃, while in the embodiment, the temperature of the chilled water can be increased to 15-20 ℃, theoretically, the average power consumption of the refrigerating unit 1 is increased by 2-3% because the evaporation temperature is reduced by 1 ℃ every time the chilled water temperature is reduced, the cooling temperature of the traditional energy accumulation air conditioner is lower than 7-12 ℃ during cold accumulation at night, the temperature of the traditional energy accumulation air conditioner is lower than 0 ℃, and an antifreeze loop and the like are required to be arranged. Therefore, the average power consumption rate of the air conditioning system in the embodiment can be reduced by about 20-30% compared with that of the traditional cold accumulation air conditioning system unit. Compared with the traditional energy storage system, the system has simple structure and simpler operation control management.
And the relatively high-temperature cooling water is adopted, so that the condensation phenomenon caused by the fact that the temperature of the indoor wall surface is lower than the indoor dew point temperature can be avoided. Because the chilled water temperature is high, the radiation tail end only bears indoor sensible heat load and does not bear latent heat load. Latent heat load is born by a fresh air system, and cooling and dehumidification of the fresh air system can be realized by solution dehumidification or a low-temperature water chilling unit and the like.
The air conditioning system disclosed in the embodiment is further provided with a central control system, the central control system comprises a processor 8, and an energy storage operation strategy can be formulated according to a local peak valley electricity price policy, wherein the specific strategy is that the electricity consumption is reduced in the peak electricity consumption period, and the electricity consumption is increased in the valley electricity consumption period.
In a typical specific implementation scene, indoor temperature and humidity and wall surface temperature and humidity sensors are arranged in indoor rooms, a central control system controls the operation of an energy storage process according to the reduction of the indoor temperature and humidity and the wall surface temperature, determines the energy storage operation time at the time of lowest electricity price at night, and determines the energy storage starting and stopping time; when the predicted energy storage amount and the temperature set value are reached, ending the energy storage; because the outdoor temperature is low at night, the temperature difference between the indoor and the outdoor is small after energy storage, and the energy storage cold loss is small. The central control system can realize the automatic switching of the energy storage function of the cooling tower and the energy storage function of the refrigerating machine according to the monitored outdoor temperature, the cooling water temperature, the indoor temperature and the indoor humidity and the like by taking the purposes of running energy conservation and cost saving.
More specifically, the system further comprises a chilled water circulating water pump 6, a cooling water circulating water pump 7, a network weather monitoring element 9, an outdoor temperature and humidity monitoring element 10 and first to fourth valves; wherein the condenser to the cooling tower 3 to the condenser form a first circulation loop 20 for cooling water circulation; a second circulation pipeline 21 is formed from the cold water tower 3 to the plate heat exchanger 2 to the cold water tower 3, and a third circulation loop is formed from the plate heat exchanger 2 to the tail end of the radiant heat exchanger 5 to the plate heat exchanger 2; the evaporator to the end of the radiant heat exchanger 5 to the evaporator forms a fourth circulation loop 23 for chilled water circulation. The first valve 12 is used for opening the refrigerating unit 1 when the refrigerating unit works; the second valve 13 is opened when the cold water tower 3 or other cold sources 4 are directly utilized; the third valve 14 is used for opening when the refrigerating unit 1 works; the fourth valve 15 is used for opening when the cold water tower 3 or other cold sources 4 are directly utilized.
It can be understood that the network weather monitoring element 9 is an element capable of communicating with the internet and obtaining weather information from the internet, such as a mobile phone, the outdoor temperature and humidity monitoring element 10 is an outdoor temperature and humidity sensor, and the indoor temperature and humidity monitoring element 11 is an indoor temperature and humidity sensor.
An evaporator and a radiation heat exchanger 5 in the refrigerating unit 1 are connected through a second circulation loop, a condenser and a cooling tower 3 in the refrigerating unit 1 are connected through a first circulation loop 20, a network weather monitoring element 9, an outdoor temperature and humidity monitoring element 10, an indoor temperature and humidity monitoring element 11 and a temperature monitoring element connected with the cooling tower 3 which are connected with a processor 8 can simultaneously monitor outdoor temperature and humidity, indoor temperature and humidity, cooling water temperature and the like, cold storage start-stop time is reasonably determined, and function switching of cooling supply of the refrigerating unit 1 and the cooling tower is coordinated.
In this embodiment, can adopt two kinds of cooling modes of refrigerating unit 1 cooling and cooling tower cooling, the switching valve that sets up on the accessible loop is automatic to be realized, and the valve should adopt the motorised valve, and relevant control signal should link to each other with central controller simultaneously, realizes the automatic monitoring and the control of whole work. When the temperature sensor detects that the cooling water in the cooling tower 3 is low, the first cold source valve 17 and the second cold source valve 19 are opened, the first refrigerating unit valve 16 and the second refrigerating unit valve 18 are closed, and cold is supplied to the plate heat exchanger 2 through the second circulating pipeline 21. Similarly, if other natural cold sources are available, the first cold source valve 17 and the second cold source valve 19 may be opened, the first refrigerator group valve 16 and the second refrigerator group valve 18 may be closed, and cold may be supplied to the plate heat exchanger 2 through the second circulation line 21. The second circulation pipeline 21 and the third circulation pipeline 22 are loops when the outdoor temperature is low at night, water in the cooling tower 3 or other cold sources 4 exchanges heat with water flowing through a heat exchange coil on the wall or the ground in the air conditioner indoor in the plate heat exchanger 2 by controlling the switching valve, and finally flows back to the cooling tower 3 or other cold sources, the refrigeration unit 1 does not need to be started, water in the cooling tower 3 and other cold sources can be recycled, and energy consumption of the cooling tower 3 or other cold sources 4 is not needed.
It will be understood that the first through fourth valves, the first refrigerator group valve 16, the first cold source valve 17, the second refrigerator group valve 18, and the second cold source valve 19 are all connected to the processor 8.
In this embodiment, the radiation heat exchanger 5 is used as the cooling end, and different types of PPR and PVC heat exchange tubes suitable for floor radiation heat supply can be used as the cooling end. The cooling tail end is arranged at a depth of 5cm from the inner surface of the enclosure structure, and the heat exchange requirements of refrigeration and cold accumulation can be met.
In the embodiment, the plate heat exchanger 2 and the radiation heat exchanger 5 are also used as the tail end cooling coil which is arranged in the enclosure structures such as the wall body and the like, the tail end equipment does not occupy the use space and can be laid on the floor or the roof or the surrounding wall body according to the climate, load requirements and the like of different areas. The building envelope can be floor, roof, side wall etc. can confirm mounted position and installation area according to cold load size and energy storage demand. When a plurality of indoor building envelopes are provided with radiation tail ends or a plurality of loops, a water distributor and collector is required to be arranged to ensure the hydraulic uniformity of the loops. Based on the energy storage mode, the energy release process is automatically carried out when the temperature of an indoor field is higher than the temperature of a wall surface, in order to avoid early starting of the energy release process and loss of cold air, the related door and window of a room have good sealing performance, the enclosure structure also has good thermal performance, and the application in glass curtain wall buildings is carefully balanced.
This embodiment sets up plate heat exchanger 2 when the cooling tower supplies cold, supplies cold through the heat exchanger is indirect, and its purpose is to guarantee the quality of water of refrigerated water loop. In other embodiments, when the cooling tower is a closed cooling tower, the plate heat exchanger 2 may not be needed, and the cooling tower is directly switched to the chilled water loop.
It should be noted that, in this embodiment, the energy storage device is implemented based on the building envelope, and is more suitable for the envelope with good thermal inertia. For a light building structure, the heat capacity is small, the energy storage capacity is small, the light building structure can be used by combining a phase change energy storage material (22-24 ℃), and higher energy storage capacity and better energy storage effect can be realized. The energy storage mode adopted in this embodiment can only satisfy partial load generally, can not satisfy the cold load demand of whole day, and when the storage cold air exhausts indoor humiture and rises to more than 26 ℃, need open the refrigerator and normally supply cold to guarantee the travelling comfort of indoor thermal environment.
Example 2
In a typical embodiment of the present invention, a building structure based intermittent cold storage method is also disclosed, using the building structure based intermittent cold storage air conditioning system of example 1:
dividing the working time into night working time and daytime working time, wherein the specific dividing conditions are determined according to sunrise and sunset time; meanwhile, the working time in the daytime is divided into normal working time and abnormal working time, the normal working time is a time period for centralized working of people, and the abnormal working time is a time period for evacuation of people, and it can be understood that the normal working time is usually 9: 00-17: 00.
In the working time at night, the air conditioning system stops running, chilled water is prepared by utilizing off-peak electricity to circularly cool the building structure, and cold air is stored in the building structure through a heat exchange radiator;
during working time in the daytime and abnormal working time in the morning, the indoor temperature and humidity are slightly lower, the air-conditioning refrigeration equipment is not started, and the indoor proper temperature is maintained through cold air stored in a structure, so that the indoor temperature and humidity are allowed to fluctuate within a comfortable range;
when the indoor load is increased and the cold storage air is consumed completely, the temperature rises above the air conditioning control point, and then the refrigerating unit 1 is started.
Under the condition that indoor temperature and humidity and wall surface temperature and humidity sensors are installed in an indoor room, the central control system controls the operation of the energy storage process according to the reduction of the indoor temperature and humidity and the wall surface temperature, determines the energy storage operation time at the time of lowest electricity price at night, and determines the energy storage starting and stopping time. When the predicted energy storage amount and the temperature set value are reached, ending the energy storage; because the outdoor temperature is low at night, the temperature difference between the indoor and the outdoor is small after energy storage, and the energy storage cold loss is small. The central control system can realize the automatic switching of the energy storage function of the cooling tower and the energy storage function of the refrigerating machine according to the monitored outdoor temperature, the cooling water temperature, the indoor temperature and the indoor humidity and the like by taking the purposes of running energy conservation and cost saving.
In this embodiment, can adopt two kinds of cooling modes of refrigerating unit 1 cooling and cooling tower cooling, the switching valve that sets up on the accessible loop is automatic to be realized, and the valve should adopt the motorised valve, and relevant control signal should link to each other with central controller simultaneously, realizes the automatic monitoring and the control of whole work. When the temperature sensor detects that the cooling water in the cooling tower 3 is low, the first cold source valve 17 and the second cold source valve 19 are opened, the first refrigerating unit valve 16 and the second refrigerating unit valve 18 are closed, and cold is supplied to the plate heat exchanger 2 through the second circulating pipeline 21. Similarly, if other natural cold sources are available, the first cold source valve 17 and the second cold source valve 19 may be opened, the first refrigerator group valve 16 and the second refrigerator group valve 18 may be closed, and cold may be supplied to the plate heat exchanger 2 through the second circulation line 21. The second circulation pipeline 21 and the third circulation pipeline 22 are loops when the outdoor temperature is low at night, water in the cooling tower 3 or other cold sources 4 exchanges heat with water flowing through a heat exchange coil on the wall or the ground in the air conditioner indoor in the plate heat exchanger 2 by controlling the switching valve, and finally flows back to the cooling tower 3 or other cold sources, the refrigeration unit 1 does not need to be started, water in the cooling tower 3 and other cold sources can be recycled, and energy consumption of the cooling tower 3 or other cold sources 4 is not needed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An intermittent cold accumulation air-conditioning system based on a building structure is characterized by comprising a refrigerating unit, a cold source, a plate type heat exchanger and a radiation heat exchanger; the refrigeration unit is communicated with a cold source through a first circulation pipeline, the refrigeration unit is communicated with a radiation heat exchanger in a building structure through a fourth circulation pipeline, the first circulation pipeline is communicated with the plate heat exchanger through a second circulation pipeline, and the fourth circulation pipeline is communicated with the plate heat exchanger through a third circulation pipeline; wherein the refrigerating temperature range of the refrigerating unit is 15-20 ℃.
2. The building structure-based intermittent cold accumulation air conditioning system as claimed in claim 1, wherein the cold source comprises a first cold source and a second cold source, and the first circulation pipeline is connected in parallel with the first cold source and the second cold source.
3. The intermittent cold accumulation air conditioning system based on building structure as claimed in claim 2, wherein the first cold source is a cooling tower and the second cold source is a soil source or a water source.
4. The building structure based intermittent cold storage air conditioning system as claimed in claim 1, further comprising a processor, an indoor temperature and humidity monitoring element, an outdoor temperature and humidity monitoring element and a plurality of valves, wherein the indoor temperature and humidity monitoring element and the outdoor temperature and humidity monitoring element are capable of communicating with the processor, and the processor is capable of communicating with the plurality of valves.
5. The building structure-based intermittent cold accumulation air conditioning system as claimed in claim 1, wherein the cooling water in the first circulation line can circulate between the refrigerator group and the cold source, and the cooling water in the fourth circulation line can circulate between the refrigerator group and the radiant heat exchanger; the first circulation pipeline and the fourth circulation pipeline are both provided with valve bodies to adjust the flow rate.
6. The intermittent cold-storage air-conditioning system based on the building structure as claimed in claim 1, wherein the first circulation pipeline and the fourth circulation pipeline are provided with circulating water pumps.
7. An intermittent cold accumulation air conditioning system based on building structure as claimed in claim 1 wherein said radiation heat exchanger employs a capillary tube disc or a heat exchange tube; the radiation heat exchanger is arranged on the inner surface of an enclosure structure constructed at a distance from a building.
8. The building structure based intermittent cold accumulation air conditioning system as claimed in claim 1, wherein the refrigerating unit comprises an evaporator, a condenser, an expansion valve and a compressor which are connected, the evaporator is communicated with the radiant heat exchanger located in the building structure through a fourth circulating pipeline, and the condenser is communicated with the cold source through a first circulating pipeline.
9. An intermittent cold accumulation method based on a building structure, which is characterized in that the intermittent cold accumulation air-conditioning system based on the building structure as claimed in any one of claims 1 to 8 is used for supplying cold to the building structure through a plate heat exchanger and a radiation heat exchanger.
10. The intermittent cold accumulation method based on building structure as claimed in claim 9, wherein during night time operation, the air conditioning system stops operating, the building structure is cooled by circulating chilled water produced by off-peak electricity, and cold air is accumulated in the building structure by the heat exchange radiator;
during working time in the daytime and abnormal working time in the morning, the indoor temperature and humidity are slightly lower, the air-conditioning refrigeration equipment is not started, and the indoor proper temperature is maintained through cold air stored in a structure, so that the indoor temperature and humidity are allowed to fluctuate within a comfortable range;
when the indoor load increases and the temperature rises above the air conditioning control point, the refrigeration unit is started.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010542474.4A CN111649421A (en) | 2020-06-15 | 2020-06-15 | Intermittent cold accumulation air conditioning system and method based on building structure |
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| CN202010542474.4A CN111649421A (en) | 2020-06-15 | 2020-06-15 | Intermittent cold accumulation air conditioning system and method based on building structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817380A (en) * | 2023-07-12 | 2023-09-29 | 深圳市前海能源科技发展有限公司 | Regional cold source storage and charge storage coupling energy storage system |
-
2020
- 2020-06-15 CN CN202010542474.4A patent/CN111649421A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116817380A (en) * | 2023-07-12 | 2023-09-29 | 深圳市前海能源科技发展有限公司 | Regional cold source storage and charge storage coupling energy storage system |
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