CN117146397A - Cold accumulation temperature optimization control method and system for chilled water air conditioner system - Google Patents
Cold accumulation temperature optimization control method and system for chilled water air conditioner system Download PDFInfo
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- 238000009825 accumulation Methods 0.000 title claims abstract description 314
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005457 optimization Methods 0.000 title claims abstract description 21
- 238000004378 air conditioning Methods 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000004891 communication Methods 0.000 claims description 13
- 238000009529 body temperature measurement Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 description 20
- 238000005265 energy consumption Methods 0.000 description 10
- 239000002699 waste material Substances 0.000 description 10
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- 238000004321 preservation Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
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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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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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- 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 relates to a cold accumulation temperature optimization control system and method of a chilled water cold accumulation air conditioning system, wherein the system comprises a refrigerating unit, a cold accumulation tank, a chilled water return pipe, a chilled water supply pipe, a chilled water pump, a cold accumulation pump, a cold discharge pump, a cold gauge and a controller, the cold gauge accumulates the cold energy used by the metering system, and the controller is used for determining the current total-day cold energy Q real And assign to the predicted cooling capacity Q of the next day next And the next day is predicted to supply cold quantity Q next Theoretical maximum cold accumulation quantity Q of cold accumulation tank max Comparing to determine the optimal cold storage temperature t of the cold storage tank set The method comprises the steps of carrying out a first treatment on the surface of the The controller is also used for controlling the temperature t according to the optimal cold accumulation temperature set The control system enters a cold accumulation mode running state or a stopping state. The invention can not only just meet the cold energy required in the next day, but also improve the outlet water temperature of the refrigerating unit during cold accumulation working condition, improve the COP of the refrigerating unit, ensure the refrigerating unit to operate under the working condition of high efficiency, and realize the energy-saving operation of the water cold accumulation air conditioning system.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a cold accumulation temperature optimization control method and system of a chilled water storage air conditioner system.
Background
With the high-speed development of the economy in China, the development of the third industry is rapid, public buildings occupy a large share in new buildings, wherein the application of a central air conditioner is very wide, and the energy consumption of the central air conditioner accounts for about 40% of the total energy consumption of the public buildings. Many cities can be air conditioned up to 50% of peak local grid loads. Therefore, the energy-saving research in the air conditioner field becomes a very important part of energy-saving work in China, and the air conditioner energy-saving research has great significance on energy conservation. In the 90 s, professional journals in domestic refrigeration and heating industries began to introduce an advanced and novel central air conditioning system, namely a cold accumulation air conditioning system, to the domestic, wherein the water cold accumulation air conditioning system is widely applied to various projects due to excellent economic benefits. The water cold storage technology utilizes night valley electricity period, uses a conventional refrigerating unit to prepare cold water, stores the cold water in a water tank, uses electricity peak period in the daytime the next day, and uses the stored cold water to supply cold for users. In the prior art, a mode adopted by a common water cold storage air conditioning system is that the water inlet and outlet temperature of 4/12 ℃ is fixed, the water is supplied for cooling all the year round, the maximum temperature difference can be obtained in the mode, the theoretical cold storage amount of the water cold storage system is maximum, and the economic benefit is also maximum under the policy of peak-to-valley electricity price. However, for the building with annual cold supply, the building needs to be cooled in transitional seasons and even winter, in the period, the actual cold load of the building is far smaller than the theoretical cold storage amount, if the cold storage is performed according to the mode of 4/12 ℃, the situation that the once cold storage amount is too large and the whole cold storage amount can be completely discharged only after a plurality of days of cold storage is needed, so that a large amount of cold storage amount remains, and in the cold storage period, the absolute heat preservation cannot be realized, the cold amount is lost, and the energy waste is caused. Therefore, an optimal control algorithm is needed for the cold accumulation temperature, when the actual cold load is smaller, the proper cold accumulation temperature is selected, the cold accumulation amount just meets the demand amount of the next day when full accumulation is realized, the waste of the cold accumulation amount is avoided, and meanwhile, the proper cold accumulation temperature can improve the water outlet temperature of the refrigerating unit when the cold accumulation is performed, so that the COP of the refrigerating unit is improved to some extent, and the energy-saving effect can be achieved on the system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cold accumulation temperature optimization control system and method of a chilled water storage air conditioning system aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the cold accumulation temperature optimization control system of the chilled water cold accumulation air conditioning system comprises a refrigerating unit, a cold accumulation tank, a chilled water return pipe, a chilled water supply pipe, a chilled water pump, a cold accumulation pump, a cold discharge pump and a controller, wherein the chilled water return pipe, the chilled water pump, the refrigerating unit, the chilled water supply pipe and a user terminal are sequentially communicated and form a circulating water loop, the chilled water return pipe, the cold accumulation tank, the cold discharge pump, the chilled water supply pipe and the user terminal are sequentially communicated and form a cold discharge loop, the cold accumulation tank, the cold accumulation pump and the refrigerating unit are sequentially communicated and form a cold accumulation loop, a cold gauge is arranged on the chilled water supply pipe, and the refrigerating unit, the cold gauge, the chilled water pump, the cold accumulation pump, the cold discharge pump and a temperature measurement cable are respectively electrically connected with the controller;
the cold gauge accumulates the using cold energy of the metering system and sends the accumulated using cold energy to the controller;
the controller obtains the current total-day cooling capacity Qrea l through the difference value of the accumulated cooling capacity at the same time point of the two days before and after, and assigns the current total-day cooling capacity Qrea l to the predicted cooling capacity Q of the next day next To predict the next day of cold supply quantity Q next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank max Comparing and determiningOptimum cold storage temperature t of the cold storage tank set ；
The controller is also used for controlling the optimal cold accumulation temperature t set The control system enters a cold accumulation mode operation state.
The beneficial effects of the invention are as follows: the cold accumulation temperature optimization control system of the chilled water cold accumulation air conditioning system forms a circulating water loop through the chilled water return pipe, the chilled water pump, the refrigerating unit, the chilled water supply pipe and the user terminal, forms a cold release loop through the chilled water return pipe, the cold accumulation tank, the cold release pump, the chilled water supply pipe and the user terminal, and forms a cold accumulation loop through the cold accumulation tank, the cold accumulation pump and the refrigerating unit, so that the switching between chilled water accumulation and cold release can be realized, and the current total-day cold supply quantity Q detected by a cold meter is obtained real And further calculate the optimal cold storage temperature t set The method can not only just meet the required cold energy in the next day, but also improve the water outlet temperature of the refrigerating unit during cold accumulation working conditions, improve the COP of the refrigerating unit, ensure the refrigerating unit to run under the working conditions with high efficiency, and achieve the purpose of energy conservation. The system has simple structure, stable and reliable operation, can reduce the energy consumption of the system while ensuring the cooling capacity required by users, realizes the energy-saving operation of the chilled water storage air conditioning system, is suitable for the installation and debugging of practical engineering, and can be widely applied to building air conditioning systems.
Based on the technical scheme, the invention can also be improved as follows:
further: the controller predicts the cold supply quantity Q for the next day next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank max Comparing to determine the optimal cold storage temperature t of the cold storage tank set The specific implementation of (3) is as follows:
if Q next ≥r 1 *Q max Determining the optimal cold accumulation temperature t set Equal to the minimum cold accumulation temperature threshold t min ；
If r 2 *Q max ＜Q next ＜r 1 *Q max The optimal cold accumulation temperature t is determined according to the following formula set ：
t set ＝t min +
If Q next ≤r 2 *Q max Determining the optimal cold accumulation temperature t set Is equal to the maximum cold accumulation temperature threshold t max ；
Wherein Q is max =c×ρ×v×Δt; c is the specific heat capacity of cooling water, ρ is the minimum cold accumulation temperature threshold t min The density of the water is V is the cold storage volume of the cold storage tank, delta t is the temperature difference of water at the inlet and outlet of the cold storage tank, and r 1 And r 2 The first cold accumulation critical coefficient and the second cold accumulation critical coefficient are respectively, and 1 is more than r 1 ＞r 2 ＞0。
The beneficial effects of the above-mentioned further scheme are: by predicting the next day the cooling capacity Q next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank max The cold energy storage system is characterized in that the cold energy storage system is divided into different gradients according to the size relation of the cold energy storage system and the cold energy storage system, different cold load conditions are considered, the cold energy storage temperature is maximally rationalized, the cold energy required by the next water cold storage system can be met, the excessive cold energy is not required, the energy waste caused by the loss of the cold energy is avoided, the cold energy required by a user is ensured to be met, and the energy-saving operation of the water cold storage air conditioning system is realized.
Further: a temperature measuring cable is arranged in the cold accumulation tank and used for measuring water temperatures with different heights in the cold accumulation tank;
the controller is also used for calculating the average temperature of water in the cold accumulation tank according to the temperature measurement cable measuring the water temperatures with different heights in the cold accumulation tank, and controlling the working state of the circulating cold accumulation loop according to the average temperature and the preset temperature.
The beneficial effects of the above-mentioned further scheme are: the temperature measuring cable is used for measuring the water temperatures at different heights in the cold storage tank, so that the average temperature of the water in the cold storage tank is accurately calculated, and the Shui Wenheng in the cold storage tank can be dynamically controlled to be within a set range.
Further: the controller controls the working state of the circulating cold accumulation loop according to the average temperature and the preset temperature to be as follows:
when the average temperature is equal to the preset temperature, controllingThe circulating cold accumulation loop enters a cold accumulation mode stop state, otherwise, the circulating cold accumulation loop is in a cold accumulation mode stop state according to the optimal cold accumulation temperature t set And controlling the circulating cold accumulation loop to operate and keeping the circulating cold accumulation loop in a cold accumulation mode operation state.
The beneficial effects of the above-mentioned further scheme are: when the average temperature is equal to the preset temperature, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state, so that energy consumption can be reduced, energy waste is reduced, the water cold accumulation state is switched again when the average temperature exceeds the preset temperature, and energy-saving operation is realized on the basis of realizing water cold accumulation.
The invention also provides a cold accumulation temperature optimization control method of the water cold accumulation air conditioning system, which comprises the following steps:
the cold gauge accumulates the using cold energy of the metering system and sends the accumulated using cold energy to the controller;
the controller calculates the total-day cooling capacity Qrea l according to the accumulated cooling capacity difference value of the same time point of the two days before and after, and the total-day cooling capacity Q real Assigning a value to the predicted cooling capacity Q for the next day next To predict the next day of cold supply quantity Q next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank max Comparing to determine the optimal cold storage temperature t of the cold storage tank set 。
The controller is used for controlling the cold accumulation temperature t according to the optimal cold accumulation temperature t set The control system enters a cold accumulation mode operation state.
The cold accumulation temperature optimization control method of the chilled water accumulation air conditioning system of the invention detects the current total-day cold supply quantity Q through the cold quantity meter real And further calculate the optimal cold storage temperature t set The method can not only just meet the required cold energy in the next day, but also improve the water outlet temperature of the refrigerating unit during cold accumulation working conditions, improve the COP of the refrigerating unit, ensure the refrigerating unit to run under the working conditions with high efficiency, and achieve the purpose of energy conservation. The system has simple structure, stable and reliable operation, can reduce the energy consumption of the system while ensuring the cooling capacity required by users, realizes the energy-saving operation of the chilled water storage air conditioning system, and is suitable for the installation and debugging of practical engineeringCan be widely applied to building air conditioning systems.
Based on the technical scheme, the invention can also be improved as follows:
further: the controller predicts the cold supply quantity Q for the next day next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank max Comparing to determine the optimal cold storage temperature t of the cold storage tank set . The method specifically comprises the following steps:
if Q next ≥r 1 *Q max Determining the optimal cold accumulation temperature t set Equal to the minimum cold accumulation temperature threshold t min ；
If r 2 *Q max ＜Q next ＜r 1 *Q max The optimal cold accumulation temperature t is determined according to the following formula set ：
t set ＝t min +
If Q next ≤r 2 *Q max Determining the optimal cold accumulation temperature t set Is equal to the maximum cold accumulation temperature threshold t max ；
Wherein Q is max =c×ρ×v×Δt; c is the specific heat capacity of cooling water, ρ is the minimum cold accumulation temperature threshold t min The density of the water is V is the cold storage volume of the cold storage tank, delta t is the temperature difference of water at the inlet and outlet of the cold storage tank, and r 1 And r 2 The first cold accumulation critical coefficient and the second cold accumulation critical coefficient are respectively, and 1 is more than r 1 ＞r 2 ＞0。
The beneficial effects of the above-mentioned further scheme are: by predicting the next day the cooling capacity Q next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank max The cold energy storage system is characterized in that the cold energy storage system is divided into different gradients according to the size relation of the cold energy storage system and the cold energy storage system, different cold load conditions are considered, the cold energy storage temperature is maximally rationalized, the cold energy required by the next water cold storage system can be met, the excessive cold energy is not required, the energy waste caused by the loss of the cold energy is avoided, the cold energy required by a user is ensured to be met, and the energy-saving operation of the water cold storage air conditioning system is realized.
Further: the cold accumulation temperature optimization control method of the chilled water accumulation air conditioning system further comprises the following steps:
the temperature measuring cable measures the water temperatures at different heights in the cold accumulation tank in real time, and the controller calculates the average temperature of the water in the cold accumulation tank according to the water temperatures at different heights in the cold accumulation tank and controls the working state of the circulating cold accumulation loop according to the average temperature and the preset temperature.
The beneficial effects of the above-mentioned further scheme are: the temperature measuring cable is used for measuring the water temperatures at different heights in the cold storage tank, so that the average temperature of the water in the cold storage tank is accurately calculated, and the Shui Wenheng in the cold storage tank can be dynamically controlled to be within a set range.
Further: the controller controls the working state of the circulating cold accumulation loop according to the average temperature and the preset temperature, and specifically comprises the following steps:
when the average temperature is equal to the preset temperature, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state, otherwise, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state according to the optimal cold accumulation temperature t set And controlling the circulating cold accumulation loop to operate and keeping the circulating cold accumulation loop in a cold accumulation mode operation state.
The beneficial effects of the above-mentioned further scheme are: when the average temperature is equal to the preset temperature, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state, so that energy consumption can be reduced, energy waste is reduced, the water cold accumulation state is switched again when the average temperature exceeds the preset temperature, and energy-saving operation is realized on the basis of realizing water cold accumulation.
The invention also provides a computer readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, implements the method.
The invention also provides cold accumulation temperature optimization control equipment of the chilled water accumulation air conditioning system, which comprises a communication interface, a memory, a communication bus and the controller, wherein the controller, the communication interface and the memory are communicated with each other through the communication bus;
the memory is used for storing a computer program;
and the controller is used for realizing the step of the cold accumulation temperature optimization control method of the chilled water storage air conditioning system when executing the program stored in the memory.
Drawings
FIG. 1 is a schematic diagram of a cold storage temperature optimizing control system of a chilled water storage air conditioning system according to an embodiment of the invention;
fig. 2 is a flow chart of a cold storage temperature optimizing control method of a chilled water storage air conditioning system according to an embodiment of the invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. the refrigerating unit comprises a refrigerating unit body 2, a cold storage tank 3, a cold storage tank 4, a chilled water return pipe 5, a chilled water supply pipe 6, a controller 7, a chilled water pump 8, a cold storage pump 9, a cold discharge pump 10 and a temperature measuring cable.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, the cold accumulation temperature optimization control system of the chilled water cold accumulation air conditioning system comprises a refrigerating unit 1, a cold accumulation tank 2, a chilled water return pipe 4, a chilled water supply pipe 5, a chilled water pump 7, a cold accumulation pump 8, a cold discharge pump 9 and a controller 6, wherein the chilled water return pipe 4, the chilled water pump 7, the refrigerating unit 1, the chilled water supply pipe 5 and a user terminal are sequentially communicated and form a circulating water loop, the chilled water return pipe 4, the cold accumulation tank 2, the cold discharge pump 9, the chilled water supply pipe 5 and the user terminal are sequentially communicated and form a cold discharge loop, the cold accumulation tank 2, the cold accumulation pump 8 and the refrigerating unit 1 are sequentially communicated and form a cold accumulation loop, the chilled water supply pipe 5 is provided with a cold gauge 3, and the refrigerating unit 1, the cold gauge 3, the chilled water pump 7, the cold accumulation pump 8, the cold discharge pump 9 and a temperature measurement cable 10 are respectively and electrically connected with the controller 6.
In practice, if 1 is shown, each pipeline is further provided with an electric valve, so that the controller 6 controls different valve opening and closing states to realize different pipeline switching, and detailed description thereof will not be repeated here.
The cold gauge 3 accumulates the cold energy used by the metering system and sends the cold energy to the controller 6;
the controller 6 obtains the current total-day cooling capacity Qrea l through the difference value of the accumulated cooling capacity at the same time point of the two days before and after, and assigns the current total-day cooling capacity Qrea l to the predicted cooling capacity Q of the next day next To predict the next day of cold supply quantity Q next And the theoretical maximum cold accumulation amount Q of the cold accumulation tank 2 max Comparing to determine the optimal cold accumulation temperature t of the cold accumulation tank 2 set ；
The controller 6 is also used for controlling the cold accumulation temperature t according to the optimal cold accumulation temperature t set The control system enters a cold accumulation mode operation state.
The cold accumulation temperature optimization control system of the chilled water cold accumulation air conditioning system forms a circulating water loop through a chilled water return pipe 4, a chilled water pump 7, a refrigerating unit 1, a chilled water supply pipe 5 and a user terminal, forms a cold release loop through the chilled water return pipe 4, a cold accumulation tank 2, a cold release pump 9, the chilled water supply pipe 5 and the user terminal, and forms a cold accumulation loop through the cold accumulation tank 2, the cold accumulation pump 8 and the refrigerating unit 1, so that the cold accumulation and the cold release of water can be switched, and the current total-day cold supply quantity Q detected by a cold meter 3 can be realized real And further calculate the optimal cold storage temperature t set The method can not only just meet the required cold energy in the next day, but also improve the water outlet temperature of the refrigerating unit during cold accumulation working conditions, improve the COP of the refrigerating unit, ensure the refrigerating unit to run under the working conditions with high efficiency, and achieve the purpose of energy conservation. The system has simple structure, stable and reliable operation, can reduce the energy consumption of the system while ensuring the cooling capacity required by users, realizes the energy-saving operation of the chilled water storage air conditioning system, is suitable for the installation and debugging of practical engineering, and can be widely applied to building air conditioning systems.
In one or more embodiments of the invention, the controller 6 predicts the next day's cooling capacity Q next And the theoretical maximum cold accumulation amount Q of the cold accumulation tank 2 max Comparing to determine the optimal cold accumulation temperature t of the cold accumulation tank 2 set The specific implementation of (3) is as follows:
if Q next ≥r 1 *Q max Determining the optimal cold accumulation temperature t set Equal to the minimum cold accumulation temperature threshold t min ；
If r 2 *Q max ＜Q next ＜r 1 *Q max The optimal cold accumulation temperature t is determined according to the following formula set ：
t set ＝t min +3*Q next /Q max
If Q next ≤r 2 *Q max Determining the optimal cold accumulation temperature t set Is equal to the maximum cold accumulation temperature threshold t max ；
Wherein Q is max =c×ρ×v×Δt; c is the specific heat capacity of cooling water, taking 4.2 x 10 3 J/(kg: °c), ρ is the minimum cold storage temperature threshold t min Density of water at time 10 3 kg/m 3 V is the cold accumulation volume of the cold accumulation tank 2, delta t is the temperature difference of water at the inlet and outlet of the cold accumulation tank, 8 ℃ is taken, and r is taken 1 And r 2 The first cold accumulation critical coefficient and the second cold accumulation critical coefficient are respectively, and 1 is more than r 1 ＞r 2 > 0. In actual engineering, the cold storage volume of the cold storage tank is known, and the theoretical maximum cold storage amount Qmax of the cold storage tank is a constant.
By predicting the next day the cooling capacity Q next And the theoretical maximum cold accumulation amount Q of the cold accumulation tank 2 max The cold energy storage system is characterized in that the cold energy storage system is divided into different gradients according to the size relation of the cold energy storage system and the cold energy storage system, different cold load conditions are considered, the cold energy storage temperature is maximally rationalized, the cold energy required by the next water cold storage system can be met, the excessive cold energy is not required, the energy waste caused by the loss of the cold energy is avoided, the cold energy required by a user is ensured to be met, and the energy-saving operation of the water cold storage air conditioning system is realized.
In embodiments of the invention, r 1 Take 0.85, r 2 Take 0.625, t min Taking 4 ℃, t max Take 7 ℃.
Because the cold load changes little in two adjacent days, the cold supply quantity Q is accumulated in the whole day real Predicting the next day cold supply Q next Without generating large errors.
In this embodiment, the cooling capacity Q is predicted according to the next day next And the theoretical maximum cold accumulation amount Q of the cold accumulation tank 2 max The size relation of the cold storage system is divided into different gradients, and different cold load conditions can be considered, so that the cold storage temperature reaches the maximum rationalization. Wherein the first gradient is equal to 85% of the theoretical maximum cold accumulation quantity Q of the cold accumulation tank max At a critical value of Q next >＝0.85Q max At night cold accumulation press t set The cold accumulation at the temperature of 4 ℃ is performed according to the cold accumulation temperature of the maximum theoretical cold accumulation amount due to certain cold accumulation loss in the cold accumulation process, and a certain margin is reserved, so that the partial loss can be counteracted, and the stability of cold accumulation is ensured. The second gradient is equal to 62.5 percent of the theoretical maximum cold accumulation quantity Q of the cold accumulation tank max At the minimum critical value, the theoretical maximum cold accumulation quantity Q of the cold accumulation tank is 85 percent max At a maximum critical value of 0.625Q max <Q next <0.85Q max At night cold accumulation press t set ＝4+(3*Q next /Q max ) The cold accumulation temperature is set according to the principle that the actual cold accumulation amount occupies the maximum cold accumulation amount, so that the cold accumulation temperature can be set, the required cold amount in the next day can be just met, meanwhile, the water outlet temperature of the refrigerating unit during cold accumulation working conditions can be improved, the COP of the refrigerating unit is improved, the refrigerating unit is ensured to operate under high-efficiency working conditions, and the aim of saving energy is achieved. Third gradient with 62.5% of theoretical maximum cold accumulation quantity Q of cold accumulation tank max At a critical value of Q next <＝0.625Q max At night cold accumulation press t set The amount of cold supply required the next day is small at the time of cold accumulation at 7 ℃, and cold accumulation at 7 ℃ is determined in order to give consideration to the efficiency, load factor and matching degree of the amount of cold accumulation and the amount of cold supply of the refrigerating unit.
In one or more embodiments of the present invention, a temperature measurement cable 10 is disposed in the cold storage tank 2, for measuring water temperatures at different heights in the cold storage tank 2;
the controller 6 is further configured to calculate an average temperature of water in the cold accumulation tank 2 according to the temperature measurement cable 10 and measure water temperatures at different heights in the cold accumulation tank 2, and control a working state of the circulating cold accumulation loop according to the average temperature and a preset temperature.
The temperature measuring cable 10 is used for measuring the water temperatures at different heights in the cold accumulation tank 2, so that the average temperature of the water in the cold accumulation tank 2 is calculated relatively accurately, and the water in the cold accumulation tank 2 can be controlled dynamically and kept constant within a set range.
Here, the calculation formula of the average temperature t is:
wherein n is an n-layer temperature sensor built in the temperature measuring cable.
In one or more embodiments of the present invention, the controller 6 controls the working state of the circulating cold accumulation circuit according to the average temperature and the preset temperature to specifically implement:
when the average temperature is equal to the preset temperature, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state, otherwise, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state according to the optimal cold accumulation temperature t set And controlling the circulating cold accumulation loop to operate and keeping the circulating cold accumulation loop in a cold accumulation mode operation state.
By means of the water cold accumulation device, when the average temperature is equal to the preset temperature, water cold accumulation can be suspended, energy consumption is reduced, energy waste is reduced, the water cold accumulation state is switched to again when the average temperature exceeds the preset temperature, energy-saving operation is achieved on the basis of achieving water cold accumulation, the device is suitable for installation and debugging of actual engineering, and the device can be widely applied to building air conditioning systems.
As an example, in the present invention, a theoretical maximum cold accumulation amount Q of the cold accumulation tank is given first max =30000 KWh, e.g. predicted next day cooling capacity Q next =21000 kWh, at which point Q next ＝0.7Q max At the second gradient, the optimized optimal cold accumulation temperature set value is t set ＝4+(3*Q next /Q max ) Assuming that the cooling capacity in the cooling tank is completely discharged at the same time, the average temperature t=12 ℃ in the cooling tank is equal to the average temperature t=6.1 ℃, the cooling tank starts cooling, and when t=t set When=6.1 ℃, cold accumulation is stopped, and at this time, the temperature of all water in the cold accumulation tank is 6.1 ℃.
As shown in fig. 2, the invention also provides a cold accumulation temperature optimizing control method of the water cold accumulation air conditioning system, which comprises the following steps:
s1: the cold gauge 3 accumulates the cold energy used by the metering system and sends the cold energy to the controller 6;
s2: the controller 6 calculates the total daily cooling capacity Qrea l according to the accumulated cooling capacity difference value of the same time point of the two days before and after, and the total daily cooling capacity Q real Assigning a value to the predicted cooling capacity Q for the next day next To predict the next day of cold supply quantity Q next And the theoretical maximum cold accumulation amount Q of the cold accumulation tank 2 max Comparing to determine the optimal cold accumulation temperature t of the cold accumulation tank 2 set 。
S3: the controller 6 is used for controlling the cold accumulation temperature t according to the optimal cold accumulation temperature t set The control system enters a cold accumulation mode operation state.
The cold accumulation temperature optimization control method of the chilled water accumulation air conditioning system of the invention detects the current total-day cold supply quantity Q through the cold gauge 3 real And further calculate the optimal cold storage temperature t set The method can not only just meet the required cold energy in the next day, but also improve the water outlet temperature of the refrigerating unit during cold accumulation working conditions, improve the COP of the refrigerating unit, ensure the refrigerating unit to run under the working conditions with high efficiency, and achieve the purpose of energy conservation. The system has simple structure, stable and reliable operation, can reduce the energy consumption of the system while ensuring the cooling capacity required by users, realizes the energy-saving operation of the chilled water storage air conditioning system, is suitable for the installation and debugging of practical engineering, and can be widely applied to building air conditioning systems.
In one or more embodiments of the invention, the controller 6 predicts the next day's cooling capacity Q next And the theoretical maximum cold accumulation amount Q of the cold accumulation tank 2 max Comparing to determine the optimal cold accumulation temperature t of the cold accumulation tank 2 set . The method specifically comprises the following steps:
if Q next ≥r 1 *Q max Determining the optimal cold accumulation temperature t set Equal to the minimum cold accumulation temperature threshold t min ；
If r 2 *Q max ＜Q next ＜r 1 *Q max The optimal cold accumulation temperature t is determined according to the following formula set ：
t set ＝t min +3*Q next /Q max
If Q next ≤r 2 *Q max Determining the optimal cold accumulation temperature t set Is equal to the maximum cold accumulation temperature threshold t max ；
Wherein Q is max =c×ρ×v×Δt; c is the specific heat capacity of cooling water, ρ is the minimum cold accumulation temperature threshold t min The density of the water is V is the cold storage volume of the cold storage tank 2, delta t is the temperature difference of water at the inlet and outlet of the cold storage tank, and r 1 And r 2 The first cold accumulation critical coefficient and the second cold accumulation critical coefficient are respectively, and 1 is more than r 1 ＞r 2 ＞0。
By predicting the next day the cooling capacity Q next And the theoretical maximum cold accumulation amount Q of the cold accumulation tank 2 max The cold energy storage system is characterized in that the cold energy storage system is divided into different gradients according to the size relation of the cold energy storage system and the cold energy storage system, different cold load conditions are considered, the cold energy storage temperature is maximally rationalized, the cold energy required by the next water cold storage system can be met, the excessive cold energy is not required, the energy waste caused by the loss of the cold energy is avoided, the cold energy required by a user is ensured to be met, and the energy-saving operation of the water cold storage air conditioning system is realized.
Optionally, in one or more embodiments of the present invention, the method for optimally controlling the cold storage temperature of the chilled water storage air conditioning system further includes the following steps:
the temperature measuring cable 10 measures the water temperatures at different heights in the cold accumulation tank 2 in real time, and the controller 6 calculates the average temperature of the water in the cold accumulation tank 2 according to the water temperatures at different heights in the cold accumulation tank 2 and controls the working state of the circulating cold accumulation loop according to the average temperature and a preset temperature.
The temperature measuring cable 10 is used for measuring the water temperatures at different heights in the cold accumulation tank 2, so that the average temperature of the water in the cold accumulation tank 2 is calculated relatively accurately, and the water in the cold accumulation tank 2 can be controlled dynamically and kept constant within a set range.
In one or more embodiments of the present invention, the controller 6 controls the working state of the circulating cold accumulation circuit according to the average temperature and the preset temperature, specifically including the following steps:
when the average temperature is equal to the preset temperature, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state, otherwise, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state according to the optimal cold accumulation temperature t set And controlling the circulating cold accumulation loop to operate and keeping the circulating cold accumulation loop in a cold accumulation mode operation state.
By making the average temperature equal to the preset temperature, the water cold accumulation can be suspended, the energy consumption is reduced, the energy waste is reduced, and the water cold accumulation state is switched to again when the average temperature exceeds the preset temperature, so that the energy-saving operation is realized on the basis of realizing the water cold accumulation.
The invention also provides a computer readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, implements the method.
The invention also provides cold accumulation temperature optimization control equipment of the chilled water accumulation air conditioning system, which comprises a communication interface, a memory, a communication bus and the controller 6, wherein the controller, the communication interface and the memory are communicated with each other through the communication bus;
the memory is used for storing a computer program;
the controller 6 is configured to implement the method for optimally controlling the cold storage temperature of the chilled water storage air conditioning system when executing the program stored in the memory.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A cold accumulation temperature optimization control system of a chilled water accumulation air conditioning system is characterized in that: the cold storage device comprises a refrigerating unit (1), a cold storage tank (2), a chilled water return pipe (4), a chilled water supply pipe (5), a chilled water pump (7), a cold storage pump (8), a cold discharge pump (9) and a controller (6), wherein the chilled water return pipe (4), the chilled water pump (7), the refrigerating unit (1), the chilled water supply pipe (5) and a user terminal are sequentially communicated and form a circulating water loop, the chilled water return pipe (4), the cold storage tank (2), the cold discharge pump (9), the chilled water supply pipe (5) and the user terminal are sequentially communicated and form a cold discharge loop, the cold storage tank (2), the cold storage pump (8) and the refrigerating unit (1) are sequentially communicated and form a cold storage loop, a cold gauge (3) is arranged on the chilled water supply pipe (5), and the refrigerating unit (1), the cold gauge (3), the chilled water pump (7), the cold storage pump (8), the cold discharge pump (9) and a temperature measurement cable (10) are respectively electrically connected with the controller (6).
The cold gauge (3) is used for accumulating the using cold energy of the metering system and sending the accumulated using cold energy to the controller (6);
the controller (6) is used for obtaining the current total-day cooling capacity Qreal through the difference value of the accumulated cooling capacity at the same time point of the two days before and after, and assigning the current total-day cooling capacity Qreal to the next-day predicted cooling capacity Q next To predict the next day of cold supply quantity Q next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank (2) max Comparing, determining the optimum cold storage temperature t of the cold storage tank (2) set ；
The controller (6) is also used for controlling the optimal cold accumulation temperature t set The control system enters a cold accumulation mode running state or a stopping state.
2. The chilled water storage air conditioning system of claim 1, wherein the chilled water storage temperature optimization control system comprises: the controller (6) predicts the next day cooling capacity Q next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank (2) max Comparing, determining the optimum cold storage temperature t of the cold storage tank (2) set The specific implementation of (3) is as follows:
if Q next ≥r 1 *Q max Determining the optimal cold accumulation temperature t set Equal to the minimum cold accumulation temperature threshold t min ；
If r 2 *Q max ＜Q next ＜r 1 *Q max Then it is determined according to the following formulaThe optimal cold accumulation temperature t set ：
t set ＝t min +(3*Q next /Q max )
If Q next ≤r 2 *Q max Determining the optimal cold accumulation temperature t set Is equal to the maximum cold accumulation temperature threshold t max ；
Wherein Q is max =c×ρ×v×Δt; c is the specific heat capacity of cooling water, ρ is the minimum cold accumulation temperature threshold t min The density of the water is V is the cold storage volume of the cold storage tank (2), delta t is the temperature difference of water at the inlet and outlet of the cold storage tank, and r 1 And r 2 The first cold accumulation critical coefficient and the second cold accumulation critical coefficient are respectively, and 1 is more than r 1 ＞r 2 ＞0。
3. The chilled water storage air conditioning system of claim 1, wherein the chilled water storage temperature optimization control system comprises: a temperature measuring cable (10) is arranged in the cold accumulation tank (2) and is used for measuring water temperatures with different heights in the cold accumulation tank (2);
the controller (6) is also used for calculating the average temperature of water in the cold accumulation tank (2) according to the temperature measurement cable (10) for measuring the water temperatures with different heights in the cold accumulation tank (2), and controlling the working state of the circulating cold accumulation loop according to the average temperature and the preset temperature.
4. The chilled water storage air conditioning system of claim 3, wherein the chilled water storage temperature optimization control system comprises: the controller (6) controls the working state of the circulating cold accumulation loop according to the average temperature and the preset temperature to be as follows:
when the average temperature is equal to the preset temperature, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state, otherwise, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state according to the optimal cold accumulation temperature t set And controlling the circulating cold accumulation loop to operate and keeping the circulating cold accumulation loop in a cold accumulation mode operation state.
5. A cold storage temperature optimizing control method of a chilled water storage air conditioning system, characterized in that the cold storage temperature optimizing control system of the chilled water storage air conditioning system according to any one of claims 1 to 4 is adopted, and the method comprises the following steps:
the cold gauge (3) accumulates the cold energy used by the metering system and sends the cold energy to the controller (6);
the controller (6) calculates the total-day cold supply quantity Qreal according to the accumulated cold quantity difference value of the same time point of the two days before and after, and the total-day cold supply quantity Q real Assigning a value to the predicted cooling capacity Q for the next day next To predict the next day of cold supply quantity Q next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank (2) max Comparing, determining the optimum cold storage temperature t of the cold storage tank (2) set 。
The controller (6) is based on the optimal cold storage temperature t set The control system enters a cold accumulation mode operation state.
6. The optimal control method for the cold storage temperature of the chilled water storage air conditioning system according to claim 5, wherein the controller (6) predicts the cold supply quantity Q the next day next Theoretical maximum cold accumulation quantity Q with the cold accumulation tank (2) max Comparing, determining the optimum cold storage temperature t of the cold storage tank (2) set . The method specifically comprises the following steps:
if Q next ≥r 1 *Q max Determining the optimal cold accumulation temperature t set Equal to the minimum cold accumulation temperature threshold t min ；
If r 2 *Q max ＜Q next ＜r 1 *Q max The optimal cold accumulation temperature t is determined according to the following formula set ：
t set ＝t min +(3*Q next /Q max )
If Q next ≤r 2 *Q max Determining the optimal cold accumulation temperature t set Is equal to the maximum cold accumulation temperature threshold t max ；
Wherein Q is max =c×ρ×v×Δt; c is the specific heat capacity of cooling water, ρ is the minimum cold accumulation temperature threshold t min The density of water, V is the cold storage volume of the cold storage tank (2), deltat is the temperature difference of water at the inlet and outlet of the cold accumulation tank, r 1 And r 2 The first cold accumulation critical coefficient and the second cold accumulation critical coefficient are respectively, and 1 is more than r 1 ＞r 2 ＞0。
7. The method for optimally controlling the cold storage temperature of a chilled water storage air conditioning system according to claim 5, further comprising the steps of:
the temperature measuring cable (10) measures water temperatures at different heights in the cold accumulation tank (2) in real time, and the controller (6) calculates the average temperature of water in the cold accumulation tank (2) according to the water temperatures at different heights in the cold accumulation tank (2) and controls the working state of the circulating cold accumulation loop according to the average temperature and a preset temperature.
8. The cold accumulation temperature optimization control method of the chilled water accumulation air conditioning system as in claim 7 is characterized in that the controller (6) specifically comprises the following steps of:
when the average temperature is equal to the preset temperature, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state, otherwise, the circulating cold accumulation loop is controlled to enter a cold accumulation mode stop state according to the optimal cold accumulation temperature t set And controlling the circulating cold accumulation loop to operate and keeping the circulating cold accumulation loop in a cold accumulation mode operation state.
9. A computer readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, implements the method of any of claims 5 to 8.
10. The utility model provides a cold-storage temperature optimal control equipment of water cold-storage air conditioning system which characterized in that: comprising a communication interface, a memory, a communication bus and a controller (6) according to any of claims 1 to 4, wherein the controller, the communication interface and the memory perform a communication with each other via the communication bus;
the memory is used for storing a computer program;
the controller (6) is configured to implement the method for optimally controlling the cold storage temperature of the chilled water storage air conditioning system according to any one of claims 5 to 8 when executing the program stored in the memory.
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