CN115682303B - Multi-module air conditioning system, control method thereof and storage medium - Google Patents
Multi-module air conditioning system, control method thereof and storage medium Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 117
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- 238000010438 heat treatment Methods 0.000 claims description 50
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- 238000005057 refrigeration Methods 0.000 claims description 30
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- 230000009467 reduction Effects 0.000 claims description 15
- 238000001704 evaporation Methods 0.000 claims description 14
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- 230000005494 condensation Effects 0.000 claims description 9
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Abstract
The invention discloses a multi-module air conditioning system, a control method thereof and a storage medium. The control method of the multi-module air conditioning system comprises the steps of frequency adjustment in the running process of the air conditioning system, and comprises the following steps: step 1, obtaining a corresponding frequency adjustment instruction according to the matching degree of the current output capacity of an air conditioning system and the demand capacity of a user; and 2, controlling the corresponding module to perform corresponding frequency adjustment or start-stop according to the current working condition of the air conditioning system, the frequency adjustment instruction and the outdoor environment temperature of each started module. According to the invention, the outdoor environment temperature of each module of the air conditioning system is incorporated into the control strategy, so that the optimal energy efficiency of the air conditioning system is realized.
Description
Technical Field
The invention relates to the technical field of multi-module air conditioning system control, in particular to a multi-module air conditioning system and a control method thereof.
Background
The multiple modules of the existing multi-module air conditioning system are mutually and parallelly installed, and the air conditioning system with multiple heat pump units installed in a modularized and parallel mode is taken as an example, so that the capability difference of output under different loads is huge, and a reasonable control method has a decisive influence on the energy efficiency of the system.
The common modularized heat pump unit mostly uses air as a cold source, so that the air inlet temperature (namely the outdoor environment temperature) of the fin heat exchanger has a decisive effect on the energy efficiency of the unit, the evaporation temperature is increased during heating or the condensation temperature is reduced during refrigeration, the compression ratio can be reduced, and the energy consumption is saved.
The existing common control method is to control the number of modules and the frequency of compressors for modular operation of a heat pump unit by detecting the difference between the actual water outlet temperature and the target water outlet temperature or the starting number ratio of indoor units; the evaporation temperature or the condensation temperature of the single unit module is controlled through the gear of the external fan.
None of the prior art incorporates the evaporating and condensing temperatures of fin heat exchangers into a modular operating control strategy. When the number of the unit modules is large, local cold island and heat island effects are easy to generate, so that the air inlet temperature of the unit with the installation position at the center is worse; or the air inlet temperature of different units is different due to the influence of installation conditions, wall leaning, leeward, backlight and other factors. The above situation may cause a significant difference in operation efficiency between different modules in the system, and the optimal energy efficiency of the system cannot be achieved.
Disclosure of Invention
In order to solve the technical problem that the control strategy of the multi-module air conditioning system in the prior art does not consider the air inlet temperature of the fin heat exchanger, the invention provides the multi-module air conditioning system, a control method thereof and a storage medium.
The control method of the multi-module air conditioning system provided by the invention comprises a frequency adjusting step in the running process of the air conditioning system, wherein the frequency adjusting step comprises the following steps:
step 1, obtaining a corresponding frequency adjustment instruction according to the matching degree of the current output capacity of an air conditioning system and the demand capacity of a user;
And 2, controlling the corresponding module to perform corresponding frequency adjustment or start-stop according to the current working condition of the air conditioning system, the frequency adjustment instruction and the outdoor environment temperature of each started module.
Further, in the step 2, when the current working condition of the air conditioning system is a heating working condition, if the frequency adjustment instruction is a single-module frequency-raising instruction, a module with the highest outdoor environment temperature and not reaching the highest operating frequency is controlled to perform frequency raising; and/or if the frequency adjustment instruction is a multi-module frequency-raising instruction, controlling all the started modules which do not reach the highest operating frequency and are out of the lowest outdoor environment temperature to raise the frequency.
Further, if the frequency adjustment instruction is a single-module frequency-up instruction or a multi-module frequency-up instruction, and all started modules are the highest running frequency, the shutdown module with the highest outdoor environment temperature in all shutdown modules is controlled to start.
Further, in the step 2, when the current working condition of the air conditioning system is a refrigeration working condition, if the frequency adjustment instruction is a single-module frequency-raising instruction, a module with the lowest outdoor environment temperature and not reaching the highest operating frequency is controlled to perform frequency raising; and/or if the frequency adjustment instruction is a multi-module frequency-raising instruction, controlling all the started modules which do not reach the highest operating frequency and are out of the highest outdoor environment temperature to raise the frequency.
Further, if the frequency adjustment instruction is a single-module frequency-up instruction or a multi-module frequency-up instruction, and all started modules are the highest running frequency, the shutdown module with the lowest outdoor environment temperature in all shutdown modules is controlled to start.
Further, in the step 2, when the current working condition of the air conditioning system is a heating working condition, if the frequency adjustment instruction is a single-module frequency-reducing instruction, a module with the lowest outdoor environment temperature and not reaching the lowest operating frequency is controlled to perform frequency reduction; and/or if the frequency adjustment instruction is a multi-module frequency reduction instruction, controlling all the started modules which do not reach the lowest operating frequency and are except for the highest outdoor environment temperature to reduce the frequency.
Further, if the frequency adjustment instruction is a single-module frequency-reducing instruction or a multi-module frequency-reducing instruction, and all the started modules are the lowest running frequency, the module with the lowest outdoor environment temperature in all the started modules is controlled to stop, or when only one module is started, the module is stopped.
Further, in the step 2, when the current working condition of the air conditioning system is a refrigeration working condition, if the frequency adjustment instruction is a single-module frequency-reducing instruction, a module with the highest outdoor environment temperature and not reaching the lowest operating frequency is controlled to perform frequency reduction; and/or if the frequency adjustment instruction is a multi-module frequency reduction instruction, controlling all the started modules which do not reach the lowest operating frequency and are except the lowest outdoor environment temperature to reduce the frequency.
Further, if the frequency adjustment instruction is a single-module frequency-reducing instruction or a multi-module frequency-reducing instruction, and all the started modules are the lowest running frequency, the module with the highest outdoor environment temperature in all the started modules is controlled to stop, or when only one module is started, the module is stopped.
Further, in the step 2, when the current working condition of the air conditioning system is a heating working condition or a cooling working condition, and the frequency adjustment instruction is a single-module frequency-up instruction or a multi-module frequency-up instruction, if all modules are the highest operating frequency, the current state is maintained.
Further, in the step 2, when the current working condition of the air conditioning system is a heating working condition or a cooling working condition and the frequency adjustment command is a current frequency maintenance command, if the absolute value of the difference between the highest value and the lowest value of the outdoor ambient temperatures of all the started modules is smaller than a preset value, the frequencies of all the started modules are kept unchanged;
Otherwise, when the current working condition of the air conditioning system is a heating working condition, controlling the module with the lowest outdoor environment temperature and not reaching the lowest operating frequency to reduce the frequency, and simultaneously controlling the module with the highest outdoor environment temperature and not reaching the highest operating frequency to increase the frequency; and/or when the current working condition of the air conditioning system is a refrigerating working condition, controlling the module with the highest outdoor environment temperature and the lowest running frequency not to be reached to be in frequency reduction, and simultaneously controlling the module with the lowest outdoor environment temperature and the highest running frequency not to be reached to be in frequency increase.
Further, the air conditioning system is a water cooling unit.
Further, in the step 1, when the deviation between the actual outlet water temperature and the target outlet water temperature of the air conditioning system is greater than or equal to a preset maximum value, and the change rate of the actual outlet water temperature is less than or equal to a preset minimum value, the frequency adjustment instruction is a multi-module frequency-raising instruction, otherwise, is a single-module frequency-raising instruction; and/or when the deviation between the actual water outlet temperature and the target water outlet temperature of the air conditioning system is smaller than a preset minimum value and the change rate of the actual water outlet temperature is larger than or equal to a preset maximum value, the frequency adjusting instruction is a multi-module frequency reducing instruction, otherwise, the frequency adjusting instruction is a single-module frequency reducing instruction.
Further, the method also comprises a starting-up step of the air conditioning system, and the starting-up step comprises the following steps:
detecting the actual outlet water temperature;
If the difference between the actual water outlet temperature and the target water outlet temperature is smaller than the preset difference, only the water pump is started, and the compressor and the fan are not started; otherwise, calculating the demand load, and selecting a corresponding number of modules to start according to the relation between the demand load and the minimum output capacity of the single module.
Further, when the current working condition of the air conditioning system is a refrigeration working condition, the difference value between the actual water outlet temperature and the target water outlet temperature is the actual water outlet temperature minus the target water outlet temperature; and/or when the current working condition of the air conditioning system is a heating working condition, the difference value between the actual water outlet temperature and the target water outlet temperature is the target water outlet temperature minus the actual water outlet temperature.
Further, when the current working condition of the air conditioning system is a refrigeration working condition, the following formula is adopted to calculate the demand load of the refrigeration working condition, and the refrigeration is Q Is required to = [ (actual outdoor environment temperature-rated outdoor environment temperature) ×condensation temperature coefficient+ (rated water outlet temperature-actual water outlet temperature) ×evaporation temperature coefficient ] (actual number of internal machines/total number of internal machines/internal machine super-proportion) ×total external machine rated capacity Q Total (S) ; and/or when the current working condition of the air conditioning system is a heating working condition, calculating the demand load of the heating working condition by adopting the following formula, wherein the heating Q Is required to = [ (rated environment temperature-actual environment temperature) ×evaporation temperature coefficient+ (actual water temperature-rated water temperature) ×condensation temperature coefficient ] (actual number of internal machines/total number of internal machines/internal machine super-matching ratio) and total external machine rated capacity Q Total (S) .
Further, the number of the starting-up modules is calculated according to the following formula, wherein the number n=q Is required to /Q Total (S) ×the total number of external machine modules N/(the minimum output capacity ratio α×a of the single module), and a is greater than 1.
Further, when the number of the starting-up modules is multiple, if the current working condition of the air conditioning system is a refrigeration working condition, starting up the modules in sequence from low outdoor environment temperature to high outdoor environment temperature; and/or when the current working condition of the air conditioning system is a heating working condition, sequentially controlling the starting up of each module according to the sequence from high outdoor environment temperature to low outdoor environment temperature.
Further, the method also comprises a defrosting step of the air conditioning system, and the defrosting step comprises the following steps:
Judging whether each started module meets defrosting conditions or not;
If the plurality of modules meet defrosting conditions, calculating the difference value between the outdoor environment temperature and the low-pressure temperature of each module;
And selecting at least one module to enter defrosting operation according to the relation between the number of the started modules and the preset number and the sequence from big to small according to the difference value between the outdoor environment temperature and the low-pressure temperature.
Further, when the number of the started modules is smaller than the preset number, controlling one module with the largest difference between the outdoor environment temperature and the low-pressure temperature to enter defrosting operation; and/or when the number of the started modules is greater than or equal to the preset number, selecting n 1/a modules to enter defrosting operation according to the sequence from the large difference value of the outdoor environment temperature and the low-pressure temperature, wherein n is the number of the started modules, and a is the preset number.
Further, the preset number is a minimum integer greater than (1+q Frosting /Q Defrosting agent ), Q Frosting is heating capacity when the air conditioning system meets defrosting conditions, and Q Defrosting agent is refrigerating capacity when the air conditioning system is defrosted.
The multi-module air conditioning system provided by the invention comprises a controller, wherein the controller controls the multi-module air conditioning system by adopting the control method of the multi-module air conditioning system.
The computer readable storage medium is used for storing a computer program, and the control method of the multi-module air conditioning system is executed when the computer program runs.
According to the invention, the air inlet temperature (outdoor environment temperature), the evaporation temperature and the condensation temperature of the fin heat exchanger are incorporated into a modularized operation control strategy, so that the refrigeration and heating energy conservation performance and the stability of the whole system during heating and defrosting are improved. The control method does not need to add components, utilizes the existing components, and improves the energy saving performance of refrigeration and heating and the stability of the whole system during defrosting under the premise of not increasing the equipment cost.
Drawings
The invention is described in detail below with reference to examples and figures, wherein:
FIG. 1 is a system schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a heat pump unit according to an embodiment of the present invention.
Fig. 3 is a flow chart of frequency adjustment according to an embodiment of the present invention.
FIG. 4 is a power-on flow chart of an embodiment of the present invention.
Fig. 5 is a defrosting flow chart of an embodiment of the invention.
Reference numerals illustrate:
1. A heat pump unit module; 11. a compressor; 12. a four-way valve; 13. a fin heat exchanger; 14. an electronic expansion valve; 15. a water side heat exchanger; 16. a gas-liquid separator; 17. a high-pressure sensor; 18. a low pressure sensor; 19. an air inlet temperature sensing bag; 2. a water separator; 3. a water collector; 4. a terminal end; 5. a total water inlet temperature sensing bulb; 51. a water inlet temperature sensing bag; 6. a total water temperature sensing bag; 61. a water outlet temperature sensing bag; 62. and (3) a water pump.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The invention relates to a multi-module air conditioning system, in particular to a water cooling unit, but part of technical schemes of the invention are not limited to the water cooling unit.
Fig. 1 shows a specific embodiment of a multi-module air conditioning system, in this embodiment, a multi-module variable frequency air cooled heat pump air conditioning system. The heat pump unit modules 1 are connected in parallel through the water separator 2 and the water collector 3, the tail end 4 is connected in series between the water separator 2 and the water collector 3, and the total water outlet temperature sensing bulb 6 (total water outlet temperature sensor) is arranged near the water outlet of the water separator 2 and is used for detecting the actual water outlet temperature (actual water outlet temperature for short) of the air conditioning system. A total inflow temperature sensing bulb 5 (total inflow temperature sensor) for detecting an actual inflow temperature is provided near the water inlet of the water collector 3.
Fig. 2 shows a schematic structure of a single heat pump unit module 1. The refrigerant is discharged from the discharge port of the compressor 11, passes through the four-way valve 12, reaches the fin heat exchanger 13, passes through the electronic expansion valve 14, reaches the water-side heat exchanger 15, passes through the four-way valve 12 and the gas-liquid separator 16, and returns to the suction port of the compressor 11. The water side heat exchanger 15 is respectively connected with the water collector 3 and the water separator 2, a water pump 62 is further arranged between the water side heat exchanger 15 and the water separator 2, and a water outlet temperature sensing bulb 61 is arranged near the water outlet of the water side heat exchanger 15 and is used for detecting the actual water outlet temperature of the single module. The water inlet of the water side heat exchanger 15 is provided with a water inlet temperature sensing bulb 51 for detecting the actual water inlet temperature of the individual modules. The inlet end of the gas-liquid separator 16 is provided with a low pressure sensor 18, the vicinity of the exhaust port of the compressor 11 is provided with a high pressure sensor 17, the vicinity of the fin heat exchanger is also provided with an air inlet temperature sensing bulb 19, and the air inlet temperature (outdoor environment temperature) of the fin heat exchanger is detected.
The control method of the multi-module air conditioning system mainly comprises three aspects, namely: starting, frequency adjustment and defrosting.
As shown in fig. 3, the following describes a frequency adjustment step of the air conditioning system of the present invention during operation, and the frequency adjustment step can be mainly summarized as the following two steps.
Step 1, obtaining a corresponding frequency adjustment instruction according to the matching degree of the current output capacity of an air conditioning system and the demand capacity of a user;
And 2, controlling the corresponding module to perform corresponding frequency adjustment or start-stop according to the current working condition of the air conditioning system, the frequency adjustment instruction and the outdoor environment temperature of each started module.
The invention brings the air inlet temperature (outdoor environment temperature) of the fin heat exchanger into a modularized operation control strategy to improve the energy efficiency of the whole air conditioning system.
In one embodiment, the frequency adjustment instruction of the present invention includes at least one of a single-module up-conversion instruction, a multi-module up-conversion instruction, a single-module down-conversion instruction, a multi-module down-conversion instruction, and a sustain frequency instruction.
The following describes various cases of step 2 based on these four instructions.
When the current working condition of the air conditioning system is a heating working condition, if the frequency adjusting instruction is a single-module frequency-increasing instruction, the module with the highest outdoor environment temperature and the highest running frequency is controlled to perform frequency increasing. And/or when the current working condition of the air conditioning system is a heating working condition, if the frequency adjusting instruction is a multi-module frequency-raising instruction, controlling all the started modules which do not reach the highest operating frequency and are out of the lowest outdoor environment temperature to raise the frequency.
And when the heating working condition is met, whether the frequency adjustment instruction is a single-module frequency-increasing instruction or a multi-module frequency-increasing instruction, if all the started modules are the highest running frequency, controlling the shutdown modules with the highest outdoor environment temperature in all the shutdown modules to start.
When the current working condition of the air conditioning system is a refrigeration working condition, if the frequency adjustment instruction is a single-module frequency-increasing instruction, controlling a module with the lowest outdoor environment temperature and not reaching the highest operating frequency to perform frequency increasing; and/or when the current working condition of the air conditioning system is a refrigeration working condition, if the frequency adjusting instruction is a multi-module frequency-raising instruction, controlling all the started modules which do not reach the highest operating frequency and are except the outdoor environment temperature to raise the frequency.
And when the refrigerating working condition is met, whether the frequency adjusting instruction is a single-module frequency increasing instruction or a multi-module frequency increasing instruction, if all the started modules are the highest running frequency, controlling the shutdown modules with the lowest outdoor environment temperature in all the shutdown modules to start.
When the current working condition of the air conditioning system is a heating working condition, if the frequency adjusting instruction is a single-module frequency reducing instruction, controlling a module with the lowest outdoor environment temperature and not reaching the lowest running frequency to reduce the frequency; and/or when the current working condition of the air conditioning system is a heating working condition, if the frequency adjusting instruction is a multi-module frequency reducing instruction, controlling all the started modules which do not reach the lowest operating frequency and are except the outdoor environment temperature to reduce the frequency.
And when the heating working condition is met, whether the frequency adjustment instruction is a single-module frequency-reducing instruction or a multi-module frequency-reducing instruction, if all the started modules are the lowest running frequency, controlling the module with the lowest outdoor environment temperature in all the started modules to stop, or stopping the module when only one module is started.
When the current working condition of the air conditioning system is a refrigeration working condition, if the frequency adjustment instruction is a single-module frequency reduction instruction, controlling a module with the highest outdoor environment temperature and the lowest running frequency to carry out frequency reduction; and/or when the current working condition of the air conditioning system is a refrigerating working condition, if the frequency adjusting instruction is a multi-module frequency reducing instruction, controlling all the started modules which do not reach the lowest operating frequency and are except the lowest outdoor environment temperature to reduce the frequency.
And when the refrigerating working condition is met, whether the frequency regulating instruction is a single-module frequency reducing instruction or a multi-module frequency reducing instruction, if all the started modules are the lowest running frequency, controlling the module with the highest outdoor environment temperature in all the started modules to stop, or stopping the module when only one module is started.
When the current working condition of the air conditioning system is a heating working condition or a refrigerating working condition and the frequency adjusting instruction is a single-module frequency-raising instruction or a multi-module frequency-raising instruction, if all the modules are at the highest operating frequency, the current state is maintained.
When the current working condition of the air conditioning system is a heating working condition or a refrigerating working condition and the frequency adjusting instruction is a current frequency maintaining instruction, if the absolute value of the difference between the highest value and the lowest value of the outdoor environment temperatures of all the started modules is smaller than a preset value, the frequencies of all the started modules are kept unchanged; otherwise, when the current working condition of the air conditioning system is a heating working condition, controlling the module with the lowest outdoor environment temperature and not reaching the lowest operating frequency to reduce the frequency, and simultaneously controlling the module with the highest outdoor environment temperature and not reaching the highest operating frequency to increase the frequency; and/or when the current working condition of the air conditioning system is a refrigerating working condition, controlling the module with the highest outdoor environment temperature and the lowest running frequency not to be reached to be in frequency reduction, and simultaneously controlling the module with the lowest outdoor environment temperature and the highest running frequency not to be reached to be in frequency increase.
In one embodiment, the air conditioning system of the present invention employs a water chiller.
When the air conditioning system is a water cooling unit, in the step 1, when the deviation between the actual water outlet temperature (i.e. the temperature detected by the total water outlet temperature sensing bulb) of the air conditioning system and the target water outlet temperature is greater than or equal to a preset maximum value, and the change rate of the actual water outlet temperature is less than or equal to a preset minimum value, the frequency adjustment instruction is a multi-module frequency-raising instruction, otherwise, the frequency adjustment instruction is a single-module frequency-raising instruction; and/or when the deviation between the actual water outlet temperature and the target water outlet temperature of the air conditioner system is smaller than a preset minimum value and the change rate of the actual water outlet temperature is larger than or equal to a preset maximum value, the frequency adjustment instruction is a multi-module frequency reduction instruction, and otherwise, the frequency adjustment instruction is a single-module frequency reduction instruction.
The following describes the start-up steps of the air conditioning system.
As shown in fig. 4, in the starting step, the actual water outlet temperature needs to be detected first, if the difference Δt between the actual water outlet temperature and the target water outlet temperature is smaller than the preset difference Δt set, only the water pump is started, the compressor and the fan are not started, and the actual water outlet temperature can be detected again after waiting for T seconds; otherwise, calculating the demand load, and selecting a corresponding number of modules to start according to the relation between the demand load and the minimum output capacity of the single module.
The difference between the actual water outlet temperature and the target water outlet temperature is calculated based on different working conditions.
When the current working condition of the air conditioning system is a refrigeration working condition, the difference value between the actual water outlet temperature and the target water outlet temperature is the actual water outlet temperature minus the target water outlet temperature, and refrigeration delta t=the actual water outlet temperature-the target water outlet temperature; and/or when the current working condition of the air conditioning system is a heating working condition, the difference value between the actual water outlet temperature and the target water outlet temperature is the target water outlet temperature minus the actual water outlet temperature, and heating deltat=target water outlet temperature-actual water outlet temperature.
The demand load is determined by the deviation of the current working condition and the rated working condition of the performance test and the starting quantity of the internal machine.
When the current working condition of the air conditioning system is a refrigeration working condition, the following formula is adopted to calculate the demand load of the refrigeration working condition, wherein the refrigeration Q Is required to = [ (actual outdoor environment temperature-rated outdoor environment temperature) ×condensation temperature coefficient+ (rated water outlet temperature-actual water outlet temperature) ×evaporation temperature coefficient ] (actual number of started internal machines/total number of internal machines/internal machine super-proportion) ×total external machine rated capacity Q Total (S) ; and/or when the current working condition of the air conditioning system is a heating working condition, calculating the demand load of the heating working condition by adopting the following formula, wherein the heating Q Is required to = [ (rated environment temperature-actual environment temperature) ×evaporation temperature coefficient+ (actual water temperature-rated water temperature) ×condensation temperature coefficient ] (actual number of internal machines/total number of internal machines/internal machine super-matching ratio) and total external machine rated capacity Q Total (S) .
The condensing temperature in the two formulas refers to the refrigerant temperature of the fin heat exchanger, and the evaporating temperature refers to the temperature of the water side heat exchanger. In the formula, other parameters except the actual outdoor environment temperature, the actual water outlet temperature and the actual startup quantity of the internal machine are all coefficients known in advance according to different units.
In one embodiment, the number of power-on modules may be calculated according to the following formula, where the number of power-on modules n=q Is required to /Q Total (S) is the total number of external modules N/(the minimum output capability of a single module is a), and a is greater than 1.
The quantity of the starting-up modules is related to the demand load and the minimum output capacity ratio alpha of a single module (a single unit), the principle is that the number of the starting-up modules is as large as possible, the area of the heat exchanger is fully utilized, the energy efficiency of each module is optimal, frequent starting caused by load fluctuation is avoided, the starting-up quantity is calculated by alpha 1.2, namely, A can take 1.2, and the specific value of A can be flexibly adjusted according to the needs.
If the result calculated by the number N of the starting-up modules is greater than the total number N of the external machine modules, the number of the starting-up modules is equal to N.
When the number of the starting-up modules is multiple, if the current working condition of the air conditioning system is a refrigeration working condition, sequentially controlling the starting-up of the modules according to the sequence from low outdoor environment temperature to high outdoor environment temperature; and/or when the current working condition of the air conditioning system is a heating working condition, sequentially controlling the starting up of each module according to the sequence from high outdoor environment temperature to low outdoor environment temperature.
The calculation principle of the starting number is that as many starting modules as possible are provided, a certain margin is reserved, and frequent starting and stopping adjustment is reduced. The technical scheme has the advantages that under the same load output, the more the modules are started, the larger the heat exchange area is utilized, and the higher the energy efficiency is.
After all the modules which need to be started are started, the modules are initialized to enter a stable stage, and the frequency adjustment step can be executed.
When the air conditioning system adopts the water cooling unit, the frequency adjusting step judges the matching degree of the output capacity of the current unit and the user demand capacity according to the deviation delta t of the actual water outlet temperature and the target water outlet temperature and the change rate a of the actual water outlet temperature, the maintenance frequency (corresponding to the maintenance frequency instruction) is maintained when the capacity output is matched with the user demand capacity, the capacity output is smaller than the rising frequency (corresponding to the single-module frequency-increasing instruction or the multi-module frequency-increasing instruction) when the user demand capacity, and the capacity output is larger than the lowering frequency (corresponding to the single-module frequency-decreasing instruction or the multi-module frequency-decreasing instruction) when the user demand capacity is outputted. And detecting the actual water outlet temperature at intervals T and calculating the change rate a.
During refrigeration, a= (actual water outlet temperature T -actual water outlet temperature T-1)/T;
During heating, a= (actual water outlet temperature T-1 -actual water outlet temperature T)/T, actual water outlet temperature T refers to actual water outlet temperature at time T, and actual water outlet temperature T-1 refers to actual water outlet temperature at time T-1.
In one embodiment, whether to increase or decrease the frequency may be specified in accordance with the following table.
Table 1 table of frequency variation relations corresponding to the degree of matching of the output capacity of the machine set with the user's demand capacity
In one embodiment, the frequency adjustment step of the present invention can be summarized as follows.
And when the load detection meets the requirement of maintaining the current frequency, maintaining the current state, and re-entering the load detection after the corresponding time interval.
When the load detection satisfies the rising frequency condition, the following is adjusted:
(1) The module with the highest air inlet temperature (highest outdoor environment temperature) and not the highest frequency operation is increased in frequency during heating; the non-highest frequency running module with the lowest air inlet temperature (lowest outdoor environment temperature) is frequency-increased during refrigeration.
(2) If all started modules reach the highest frequency, starting up a shutdown module with the highest air inlet temperature during heating; and starting the shutdown module with the lowest air inlet temperature during refrigeration.
(3) If all modules are started and the highest frequency is reached, the current state is maintained.
(4) If the frequency-raising condition that deltat is more than or equal to z and a is less than or equal to-y is met, all non-highest frequency operation modules with the lowest air inlet temperature are subjected to frequency raising during heating; and (3) the frequency of all the non-highest frequency operation modules with the highest air inlet temperature is increased during refrigeration.
When the load detection satisfies the reduced frequency condition, it is adjusted as follows:
(1) The module which is operated at the lowest frequency and has the lowest air inlet temperature is subjected to frequency reduction during heating; and the non-lowest frequency operation module with the highest air inlet temperature reduces the frequency during refrigeration.
(2) If all the started modules reach the lowest frequency, stopping the starting module with the lowest air inlet temperature during heating; the starting module with the highest air inlet temperature is stopped during refrigeration.
(3) If only one module is on and the lowest frequency is reached, the module is off.
(4) If the down-conversion condition that deltat < -z is met and a is more than or equal to y, down-converting all the non-lowest frequency running modules with highest air inlet temperature during heating; and (3) frequency reduction is carried out on all the modules which are operated at the lowest frequency except the air inlet temperature during refrigeration.
When the load detection satisfies the maintenance frequency condition, it is adjusted as follows:
(1) The difference between the minimum value and the maximum value of the air inlet temperature of all the running modules is less than 1 ℃, the air inlet temperature is kept unchanged, otherwise, the air inlet temperature is regulated according to the following (2) and (3);
(2) The module which is not operated at the lowest frequency and has the lowest air inlet temperature is subjected to frequency reduction during heating, and the module which is not operated at the highest air inlet temperature is subjected to frequency increase;
(3) The module which is not operated at the lowest frequency and has the highest air inlet temperature is subjected to frequency reduction during refrigeration, and the module which is not operated at the highest air inlet temperature is subjected to frequency increase.
The defrosting step of the present invention is described below.
As shown in fig. 5, the defrosting step first determines whether each module that has been started up satisfies a defrosting condition;
if the plurality of modules meet the defrosting condition, calculating the difference value between the outdoor environment temperature and the low-pressure temperature of each module;
And selecting at least one module to enter defrosting operation according to the relation between the number of the started modules and the preset number and the sequence from big to small according to the difference value between the outdoor environment temperature and the low-pressure temperature.
In a specific embodiment, when the number of the started modules is smaller than a preset number, controlling one module with the largest difference between the outdoor environment temperature and the low-pressure temperature to enter defrosting operation; and/or when the number of the started modules is greater than or equal to the preset number, selecting n 1/a modules to enter defrosting operation according to the sequence from the large difference value of the outdoor environment temperature and the low-pressure temperature, wherein n is the number of the started modules, and a is the preset number.
When the unit is a heat pump unit, the heat pump unit generally judges whether the defrosting condition is met through a difference delta T between the evaporation temperature of the fin heat exchanger and the air inlet temperature (outdoor environment temperature). When the delta T is larger than the preset value X corresponding to the current air inlet temperature, the fin heat exchanger is considered to be frosted and needs to be frosted, at the moment, the four-way valve is reversed, and the fin heat exchanger is used as a condenser to enter the frosting operation.
For the opened unit (module), whether the defrosting condition is met is judged, the evaporating temperature in the actual product generally uses the low pressure temperature (saturation temperature corresponding to the low pressure) detected by the low pressure sensor or the refrigerant liquid inlet pipe temperature of the fin heat exchanger as the evaporating temperature, taking the schematic diagram of fig. 2 as an example, delta t=t Air inlet -T Low pressure ,T Air inlet as the outdoor environment temperature (namely the air inlet temperature of the fin heat exchanger), T Low pressure is the temperature detected by the low pressure sensor, and when delta T is more than X, the corresponding module meets the defrosting condition.
And sequencing the units (modules) meeting the defrosting condition according to delta T, determining the number of modules running simultaneously according to the relation between the number n of started-up units and the preset number a, and ensuring that the output of the whole system is positive during defrosting.
N < a is that only 1 module is allowed to enter defrosting;
and when n is larger than or equal to a, n 1/a modules are allowed to enter defrosting operation.
The preset number a is a minimum integer greater than (1+Q Frosting /Q Defrosting agent ), Q Frosting is heating capacity when the air conditioning system meets defrosting conditions, and Q Defrosting agent is refrigerating capacity when the system is defrosted.
The invention also protects a multi-module air conditioning system, which comprises a controller, wherein the controller controls the multi-module air conditioning system by adopting the control method of the multi-module air conditioning system.
The invention also protects a computer readable storage medium for storing a computer program which when run performs the control method of the multi-module air conditioning system of the technical scheme.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (20)
1. A method for controlling a multi-module air conditioning system, comprising a frequency adjustment step during operation of the air conditioning system, the frequency adjustment step comprising:
step 1, obtaining a corresponding frequency adjustment instruction according to the matching degree of the current output capacity of an air conditioning system and the demand capacity of a user;
step 2, controlling the corresponding modules to perform corresponding frequency adjustment or start-stop according to the current working condition of the air conditioning system, the frequency adjustment instruction and the outdoor environment temperature of each started module;
the air conditioning system is a water cooling unit;
The method also comprises a starting-up step of the air conditioning system, and the starting-up step comprises the following steps:
detecting the actual outlet water temperature;
if the difference between the actual water outlet temperature and the target water outlet temperature is smaller than the preset difference, only the water pump is started, and the compressor and the fan are not started; otherwise, calculating the demand load, and selecting a corresponding number of modules to start according to the relation between the demand load and the minimum output capacity of the single module;
When the current working condition of the air conditioning system is a refrigeration working condition, calculating the demand load of the refrigeration working condition by adopting the following formula, wherein the refrigeration Q is required to be = [1+ (actual outdoor environment temperature-rated outdoor environment temperature) & condensation temperature coefficient+ (rated water outlet temperature-actual water outlet temperature) & evaporation temperature coefficient ] (actual number of started internal machines/total number of internal machines/internal machine super-proportion) & total external machine rated capacity Qtotal; and/or the number of the groups of groups,
When the current working condition of the air conditioning system is a heating working condition, the following formula is adopted to calculate the demand load of the heating working condition, and the heating qneeds = [1+ (rated environment temperature-actual environment temperature)/(evaporation temperature coefficient+ (actual water temperature-rated water temperature)/(condensation temperature coefficient ] (actual number of started internal machines/total number of internal machines/internal machine super-proportion) ] total rated capacity qtotal of the external machines.
2. The method according to claim 1, wherein in the step 2, when the current working condition of the air conditioning system is a heating working condition, if the frequency adjustment command is a single module frequency up command, the module with the highest outdoor environment temperature and not reaching the highest operating frequency is controlled to perform frequency up; and/or the number of the groups of groups,
If the frequency adjusting instruction is a multi-module frequency raising instruction, controlling all the started modules which do not reach the highest operating frequency and are out of the lowest outdoor environment temperature to raise the frequency.
3. The method for controlling a multi-module air conditioning system according to claim 2, wherein if the frequency adjustment command is a single-module frequency up command or a multi-module frequency up command, and all the started modules are the highest operating frequency, the shutdown module with the highest outdoor environment temperature among all the shutdown modules is controlled to start.
4. The method according to claim 1, wherein in the step 2, when the current working condition of the air conditioning system is a cooling working condition, if the frequency adjustment command is a single module frequency up command, the module with the lowest outdoor environment temperature and not reaching the highest operating frequency is controlled to perform frequency up; and/or the number of the groups of groups,
If the frequency adjusting instruction is a multi-module frequency raising instruction, controlling all the started modules which do not reach the highest operating frequency and are out of the highest outdoor environment temperature to raise the frequency.
5. The method according to claim 4, wherein if the frequency adjustment command is a single-module frequency up command or a multi-module frequency up command, and all the started modules are the highest operating frequency, the shutdown module with the lowest outdoor environment temperature among all the shutdown modules is controlled to start.
6. The method according to claim 1, wherein in the step 2, when the current working condition of the air conditioning system is a heating working condition, if the frequency adjustment command is a single module frequency down command, the module with the lowest outdoor environment temperature and not reaching the lowest operating frequency is controlled to perform frequency down; and/or the number of the groups of groups,
And if the frequency adjusting instruction is a multi-module frequency reducing instruction, controlling all the started modules which do not reach the lowest operating frequency and are except the highest outdoor environment temperature to reduce the frequency.
7. The method of claim 6, wherein if the frequency adjustment command is a single-module down command or a multi-module down command and all the started modules are the lowest operating frequency, the module with the lowest outdoor environment temperature in all the started modules is controlled to stop, or when only one module is started, the module is stopped.
8. The method according to claim 1, wherein in the step 2, when the current working condition of the air conditioning system is a cooling working condition, if the frequency adjustment command is a single module frequency down command, the module with the highest outdoor environment temperature and not reaching the lowest operating frequency is controlled to perform frequency down; and/or the number of the groups of groups,
And if the frequency adjusting instruction is a multi-module frequency reducing instruction, controlling all the started modules which do not reach the lowest operating frequency and are except the lowest outdoor environment temperature to reduce the frequency.
9. The method of claim 8, wherein if the frequency adjustment command is a single-module down command or a multi-module down command and all the started modules are the lowest operating frequency, the module with the highest outdoor environment temperature among all the started modules is controlled to stop, or when only one module is started, the module is stopped.
10. The method according to claim 1, wherein in the step 2, when the current working condition of the air conditioning system is a heating working condition or a cooling working condition, the frequency adjustment command is a single-module frequency-up command or a multi-module frequency-up command, and if all modules are at the highest operating frequency, the current state is maintained.
11. The method according to claim 1, wherein in the step 2, when the current working condition of the air conditioning system is a heating working condition or a cooling working condition and the frequency adjustment command is a current frequency maintenance command, if the absolute value of the difference between the highest value and the lowest value of the outdoor ambient temperatures of all the started modules is smaller than a preset value, the frequencies of all the started modules are kept unchanged;
Otherwise, when the current working condition of the air conditioning system is a heating working condition, controlling the module with the lowest outdoor environment temperature and not reaching the lowest operating frequency to reduce the frequency, and simultaneously controlling the module with the highest outdoor environment temperature and not reaching the highest operating frequency to increase the frequency; and/or when the current working condition of the air conditioning system is a refrigerating working condition, controlling the module with the highest outdoor environment temperature and the lowest running frequency not to be reached to be in frequency reduction, and simultaneously controlling the module with the lowest outdoor environment temperature and the highest running frequency not to be reached to be in frequency increase.
12. The method for controlling a multi-module air conditioning system according to claim 1, wherein in the step 1, when a deviation between an actual outlet water temperature and a target outlet water temperature of the air conditioning system is greater than or equal to a preset maximum value, and a change rate of the actual outlet water temperature is less than or equal to a preset minimum value, the frequency adjustment instruction is a multi-module frequency-up instruction, otherwise, is a single-module frequency-up instruction; and/or the number of the groups of groups,
When the deviation between the actual water outlet temperature and the target water outlet temperature of the air conditioning system is smaller than a preset minimum value and the change rate of the actual water outlet temperature is larger than or equal to a preset maximum value, the frequency adjusting instruction is a multi-module frequency reducing instruction, and otherwise, the frequency adjusting instruction is a single-module frequency reducing instruction.
13. The method for controlling a multi-mode air conditioning system according to claim 1, wherein when the current operating condition of the air conditioning system is a cooling operating condition, the difference between the actual outlet water temperature and the target outlet water temperature is the actual outlet water temperature minus the target outlet water temperature; and/or the number of the groups of groups,
When the current working condition of the air conditioning system is a heating working condition, the difference value between the actual water outlet temperature and the target water outlet temperature is the target water outlet temperature minus the actual water outlet temperature.
14. The control method of a multi-module air conditioning system according to claim 1, wherein the number of start-up modules is calculated according to the following formula, the number of start-up modules n=qneeds/qtotal x total external machine module number N/(single module minimum output capability ratio α x a), a being greater than 1.
15. The control method of a multi-module air conditioning system according to claim 1, wherein when the number of the power-on modules is plural, if the current working condition of the air conditioning system is a cooling working condition, the power-on of each module is sequentially controlled in the order from low outdoor environment temperature to high outdoor environment temperature; and/or the number of the groups of groups,
When the current working condition of the air conditioning system is a heating working condition, the modules are controlled to start according to the sequence from high outdoor environment temperature to low outdoor environment temperature.
16. The control method of a multi-module air conditioning system according to claim 1, further comprising a defrosting step of the air conditioning system, the defrosting step comprising:
Judging whether each started module meets defrosting conditions or not;
If the plurality of modules meet defrosting conditions, calculating the difference value between the outdoor environment temperature and the low-pressure temperature of each module;
And selecting at least one module to enter defrosting operation according to the relation between the number of the started modules and the preset number and the sequence from big to small according to the difference value between the outdoor environment temperature and the low-pressure temperature.
17. The control method of a multi-module air conditioning system according to claim 16, wherein when the number of the turned-on modules is less than a preset number, one module having the largest difference between the outdoor ambient temperature and the low-pressure temperature is controlled to enter a defrosting operation; and/or the number of the groups of groups,
When the number of the started modules is greater than or equal to the preset number, n 1/a modules are selected to enter defrosting operation according to the sequence from the large difference between the outdoor ambient temperature and the low-pressure temperature, wherein n is the number of the started modules, and a is the preset number.
18. The method of claim 17, wherein the preset number is a minimum integer greater than (1+q frosting/Q frosting), the Q frosting being a heating capacity of the air conditioning system when a frosting condition is satisfied, and the Q frosting being a cooling capacity of the air conditioning system when frosting.
19. A multi-module air conditioning system comprising a controller, wherein the controller controls the multi-module air conditioning system using the control method of the multi-module air conditioning system according to any one of claims 1 to 18.
20. A computer readable storage medium storing a computer program, wherein the computer program when run performs the method of controlling a multi-module air conditioning system according to any one of claims 1 to 18.
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