CN115682303A - 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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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 a frequency adjusting step in the operation process of the air conditioning system, and comprises the following steps: step 1, obtaining a corresponding frequency adjusting instruction according to the matching degree of the current output capability of the air conditioning system and the user demand capability; and 2, controlling the corresponding modules to perform corresponding frequency adjustment or start and stop according to the current working condition and the frequency adjustment instruction of the air conditioning system and the outdoor environment temperature of each started module. The outdoor environment temperature of each module of the air conditioning system is reduced and 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
A plurality of modules of the existing multi-module air-conditioning system are mutually installed in parallel, and taking the air-conditioning system with a plurality of heat pump unit modules installed in parallel as an example, the capacity difference of output required under different loads is huge, and a reasonable control method has decisive influence on the system energy efficiency.
Common modularization heat pump set uses the air as cold and hot source mostly, therefore finned heat exchanger's air inlet temperature (be outdoor ambient temperature) has the decisive action to the unit efficiency, improves evaporating temperature during heating, or reduces condensing temperature during refrigeration, can reduce the compression ratio, the energy saving consumed the festival.
The existing common control method is to control the number of modules of the modularized operation of the heat pump unit and the frequency of a compressor by detecting the difference between the actual outlet water temperature and the target outlet water temperature or the starting number ratio of indoor units; and 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 temperature and condensing temperature of a finned heat exchanger into a modular operational 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 positioned at the center is worse; or due to the influence of installation conditions, the air inlet temperatures of different units are different due to factors such as wall, leeward, backlight and the like. The above situation may cause a significant difference in operating efficiency between different modules in the system, and the optimal energy efficiency of the system cannot be achieved.
Disclosure of Invention
The invention provides a multi-module air conditioning system, a control method thereof and a storage medium, and aims to solve the technical problem caused by the fact that the air inlet temperature of a fin heat exchanger is not considered in the control strategy of the multi-module air conditioning system in the prior art.
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:
and 2, controlling the corresponding modules to perform corresponding frequency adjustment or start and stop according to the current working condition and the frequency adjustment instruction of the air conditioning system 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 adjusting instruction is a single-module frequency raising instruction, controlling a module with the highest outdoor environment temperature and without the highest operating frequency to raise the frequency; and/or if the frequency adjusting instruction is a multi-module frequency increasing instruction, controlling all started modules except the started modules which do not reach the highest operating frequency and have the lowest outdoor environment temperature to increase the frequency.
Further, if the frequency adjusting instruction is a single-module frequency increasing instruction or a multi-module frequency increasing instruction, and all the started modules are at the highest operating frequency, the shutdown module with the highest outdoor ambient temperature in all the 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 adjusting instruction is a single-module frequency raising instruction, controlling a module with the lowest outdoor environment temperature and not reaching the highest operation frequency to raise the frequency; and/or if the frequency adjusting instruction is a multi-module frequency increasing instruction, controlling all started modules except the started modules which do not reach the highest operating frequency and have the highest outdoor environment temperature to increase the frequency.
Further, if the frequency adjustment instruction is a single-module frequency-increasing instruction or a multi-module frequency-increasing instruction and all started modules are at the highest operating frequency, controlling all the stopped modules with the lowest outdoor environment temperature to start.
Further, in the step 2, when the current working condition of the air conditioning system is the heating working condition, if the frequency adjusting instruction is a single-module frequency reduction instruction, controlling the module with the lowest outdoor environment temperature and not reaching the lowest operation frequency to perform frequency reduction; and/or if the frequency adjusting instruction is a multi-module frequency reduction instruction, controlling all started modules which do not reach the lowest operating frequency and have the highest outdoor environment temperature to carry out frequency reduction.
Further, if the frequency adjustment instruction is a single-module frequency reduction instruction or a multi-module frequency reduction instruction 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 be stopped, 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 reduction instruction, controlling a module with the highest outdoor environment temperature and without reaching the lowest operating frequency to reduce the frequency; and/or if the frequency adjusting instruction is a multi-module frequency reduction instruction, controlling all started modules which do not reach the lowest operating frequency and are except the lowest outdoor environment temperature to carry out frequency reduction.
Further, if the frequency adjustment instruction is a single-module frequency reduction instruction or a multi-module frequency reduction instruction and all the started modules are the lowest operating frequency, the module with the highest outdoor environment temperature in all the started modules is controlled to be stopped, or when only one module is started, the module is stopped.
Further, in 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-increasing instruction or a multi-module frequency-increasing instruction, if all the modules are the highest operating frequency, the current state is maintained.
Further, in 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 command for maintaining the current frequency, if the absolute value of the difference between the highest value and the lowest value of the outdoor environment temperature of all the started modules is smaller than the preset value, the frequency of all the started modules is kept unchanged;
otherwise, when the current working condition of the air conditioning system is a heating working condition, controlling the frequency of the module with the lowest outdoor environment temperature and without reaching the lowest operating frequency to be reduced, and simultaneously controlling the frequency of the module with the highest outdoor environment temperature and without reaching the highest operating frequency to be increased; and/or when the current working condition of the air conditioning system is a refrigeration working condition, controlling the frequency of the module with the highest outdoor environment temperature and without reaching the lowest operation frequency to be reduced, and simultaneously controlling the frequency of the module with the lowest outdoor environment temperature and without reaching the highest operation frequency to be increased.
Further, the air conditioning system adopts a water cooling unit.
Further, in step 1, when the deviation between the actual outlet water temperature of the air conditioning system and the target outlet water temperature 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-increasing instruction, otherwise, the frequency adjustment instruction is a single-module frequency-increasing instruction; and/or when the deviation between the actual outlet water temperature and the target outlet water temperature of the air conditioning system is smaller than a preset minimum value and the change rate of the actual outlet water temperature is larger than or equal to a preset maximum value, the frequency adjusting instruction is a multi-module frequency reduction instruction, otherwise, the frequency adjusting instruction is a single-module frequency reduction instruction.
Further, the method also comprises a starting step of the air conditioning system, wherein the starting 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 starting the water pump, and not starting the compressor fan; otherwise, calculating the demand load, and selecting the modules with the corresponding number to start up 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 outlet water temperature and the target outlet water temperature is the difference value between the actual outlet water temperature and the target outlet water temperature; and/or when the current working condition of the air conditioning system is a heating working condition, the difference value between the actual outlet water temperature and the target outlet water temperature is the target outlet water temperature minus the actual outlet water temperature.
Further, when the air conditionerWhen the current working condition of the system is a refrigeration working condition, the demand load of the refrigeration working condition is calculated by adopting the following formula, and the refrigeration Q Need 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 started up/total number of internal machines/internal machine over ratio) total external machine rated capacity Q General (1) (ii) a 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, and heating Q Need to = [ (rated environment temperature-actual environment temperature) × evaporation temperature coefficient + (actual water temperature-rated water temperature) × condensation temperature coefficient]* (actual number of internal machines started up/total number of internal machines/internal machine over ratio) total external machine rated capacity Q General (1) 。
Further, the number of the boot modules is calculated according to the following formula, wherein the number of the boot modules is n = Q Need to /Q General assembly * The total number of outer modules N/(the minimum output capacity ratio α x a of the individual modules), a, is greater than 1.
Further, when the number of the startup modules is multiple, if the current working condition of the air conditioning system is a refrigeration working condition, sequentially controlling the startup of the modules according to the sequence of the outdoor environment temperature from low to high; and/or when the current working condition of the air conditioning system is a heating working condition, sequentially controlling the modules to start according to the sequence of the outdoor environment temperature from high to low.
Further, the method also comprises a defrosting step of the air conditioning system, wherein the defrosting step comprises the following steps:
judging whether each started module meets a defrosting condition or not;
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 relationship between the number of the started modules and the preset number and the sequence from large to small of 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 the module with the largest difference value between the outdoor environment temperature and the low-pressure temperature to enter defrosting operation; and/or when the number of the started modules is larger than or equal to the preset number, selecting n x 1/a modules to enter defrosting operation according to the sequence that the difference value between the outdoor environment temperature and the low-pressure temperature is from large to small, wherein n is the number of the started modules, and a is the preset number.
Further, the predetermined number is greater than (1 +Q Frosting up /Q Defrosting cream ) The smallest integer of (b), the Q Frosting Heating capacity when the air conditioning system satisfies the defrosting condition, Q Defrosting cream The refrigerating capacity of the air conditioning system during defrosting is realized.
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 in the technical scheme.
The computer-readable storage medium is used for storing a computer program, and the computer program executes the control method of the multi-module air conditioning system according to the technical scheme when running.
The invention brings the air inlet temperature (outdoor environment temperature), the evaporating temperature and the condensing temperature of the fin heat exchanger into a modularized operation control strategy, thereby improving the refrigeration, heating and energy-saving performance of the whole system and the stability during heating and defrosting. The control method of the invention does not need to add components, utilizes the existing components, and improves the refrigeration and heating energy-saving performance of the whole system and the stability during heating defrosting on the premise of not increasing the equipment cost.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a system schematic 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 boot flow diagram of an embodiment of the invention.
FIG. 5 is a flow chart of defrosting according to an embodiment of the present invention.
Description of reference numerals:
1. a heat pump unit module; 11. a compressor; 12. a four-way valve; 13. a finned 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 bulb; 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 bulb; 6. a total effluent temperature sensing bulb; 61. a water outlet temperature sensing bulb; 62. and (4) a water pump.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The invention relates to a multi-module air conditioning system, in particular to a water chiller, but part of technical scheme of the invention is not limited to the water chiller.
Fig. 1 illustrates one embodiment of a multi-module air conditioning system, which in this embodiment is embodied as a multi-module inverter air cooled heat pump air conditioning system. The heat pump unit modules 1 are connected in parallel through the water distributor 2 and the water collector 3, the tail end 4 is connected in series between the water distributor 2 and the water collector 3, and a total water outlet temperature sensing bulb 6 (total water outlet temperature sensor) is arranged near a water outlet of the water distributor 2 and used for detecting the actual water outlet temperature (actual water outlet temperature for short) of the air conditioning system. A total inlet temperature sensing bulb 5 (total inlet water temperature sensor) is provided near the water inlet of the water collector 3 for detecting the actual inlet water temperature.
Fig. 2 shows a schematic diagram of the structure of a single heat pump unit module 1. The refrigerant is discharged from an exhaust port of the compressor 11, passes through the four-way valve 12 to the fin heat exchanger 13, passes through the electronic expansion valve 14 to the water side heat exchanger 15, passes through the four-way valve 12 and the gas-liquid separator 16, and then returns to a suction port of the compressor 11. The water side heat exchanger 15 is respectively connected with the water collector 3 and the water distributor 2, a water pump 62 is further arranged between the water side heat exchanger 15 and the water distributor 2, and a water outlet temperature sensing bulb 61 is arranged near a water outlet of the water side heat exchanger 15 and used for detecting the actual water outlet temperature of a single module. The inlet of the water side heat exchanger 15 is provided with an inlet temperature sensing bulb 51 for detecting the actual inlet water temperature of the single module. The inlet end of the gas-liquid separator 16 is provided with a low-pressure sensor 18, a high-pressure sensor 17 is provided near the exhaust port of the compressor 11, and an intake air temperature sensing bulb 19 is provided near the fin heat exchanger to detect the intake air temperature (outdoor ambient temperature) of the fin heat exchanger.
The control method of the multi-module air conditioning system mainly comprises three aspects, which are respectively as follows: starting up, frequency adjustment and defrosting.
As shown in fig. 3, the frequency adjusting step of the air conditioning system of the present invention during operation is described below, and the frequency adjusting step can be mainly summarized as the following two steps.
and 2, controlling the corresponding modules to perform corresponding frequency adjustment or start and stop according to the current working condition and the frequency adjustment instruction of the air conditioning system and the outdoor environment temperature of each started module.
The invention brings the inlet air temperature (outdoor environment temperature) of the fin heat exchanger into a modular operation control strategy to improve the energy efficiency of the whole air conditioning system.
In one embodiment, the frequency adjustment command of the present invention includes at least one of a single-module frequency-up command, a multi-module frequency-up command, a single-module frequency-down command, a multi-module frequency-down command, and a frequency maintenance command.
Based on these four instructions, the following describes various cases of step 2.
And 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, controlling the module with the highest outdoor environment temperature and the highest running frequency 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 increasing instruction, controlling all started modules except the started modules which do not reach the highest operating frequency and have the lowest outdoor environment temperature to increase the frequency.
In the heating condition, whether the frequency adjusting instruction is a single-module frequency increasing instruction or a multi-module frequency increasing instruction, if all started modules are at the highest operating frequency, the shutdown module with the highest outdoor environment temperature in all shutdown modules is controlled to start.
When the current working condition of the air conditioning system is a refrigeration working condition, if the frequency adjusting instruction is a single-module frequency increasing instruction, controlling the module with the lowest outdoor environment temperature and not reaching the highest operation frequency to increase the frequency; 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 increasing instruction, controlling all started modules except the started modules which do not reach the highest operating frequency and have the highest outdoor environment temperature to increase the frequency.
And in the refrigerating working condition, whether the frequency adjusting instruction is a single-module frequency increasing instruction or a multi-module frequency increasing instruction, if all started modules are the highest running frequency, controlling the shutdown module with the lowest outdoor environment temperature in all 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 reduction instruction, controlling the module with the lowest outdoor environment temperature and not reaching the lowest operating 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 reduction instruction, controlling all started modules which do not reach the lowest operating frequency and have the highest outdoor environment temperature to reduce the frequency.
In the heating condition, whether the frequency adjusting instruction is a single-module frequency reducing instruction or a multi-module frequency reducing instruction, if all started modules are the lowest operating frequency, the module with the lowest outdoor environment temperature in all the started modules is controlled to be stopped, or when only one module is started, the module is stopped.
When the current working condition of the air conditioning system is a refrigeration working condition, if the frequency adjusting instruction is a single-module frequency reduction instruction, controlling a module with the highest outdoor environment temperature and the lowest running frequency to reduce the frequency; 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 reduction instruction, controlling all started modules which do not reach the lowest operating frequency and are except the lowest outdoor environment temperature to reduce the frequency.
And under the refrigerating working condition, whether the frequency adjusting instruction is a single-module frequency reducing instruction or a multi-module frequency reducing instruction, if all started modules are the lowest running frequency, controlling the module with the highest outdoor environment temperature in all the started modules to be stopped, 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 increasing instruction or a multi-module frequency increasing instruction, if all the modules have 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 command for maintaining the current frequency, if the absolute value of the difference value between the highest value and the lowest value of the outdoor environment temperature of all started modules is smaller than a preset value, the frequency of all started modules is kept unchanged; otherwise, when the current working condition of the air conditioning system is a heating working condition, controlling the frequency of the module with the lowest outdoor environment temperature and without the lowest operation frequency to be reduced, and simultaneously controlling the frequency of the module with the highest outdoor environment temperature and without the highest operation frequency to be increased; and/or when the current working condition of the air conditioning system is a refrigeration working condition, controlling the frequency of the module with the highest outdoor environment temperature and without reaching the lowest operation frequency to be reduced, and simultaneously controlling the frequency of the module with the lowest outdoor environment temperature and without reaching the highest operation frequency to be increased.
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 outlet water temperature (i.e. the temperature detected by the total outlet water temperature sensing bulb) of the air conditioning system and the target outlet water temperature 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 adjusting instruction is a multi-module frequency increasing instruction, otherwise, the frequency adjusting instruction is a single-module frequency increasing instruction; and/or when the deviation between the actual outlet water temperature and the target outlet water temperature of the air conditioning system is smaller than a preset minimum value and the change rate of the actual outlet water temperature is larger than or equal to a preset maximum value, the frequency adjusting instruction is a multi-module frequency reduction instruction, otherwise, the frequency adjusting instruction is a single-module frequency reduction instruction.
The following describes the start-up procedure of the air conditioning system.
As shown in fig. 4, the start-up step requires detecting the actual outlet water temperature, and if the difference Δ t between the actual outlet water temperature and the target outlet water temperature is smaller than the preset difference Δ t set When the temperature of the water is lower than the preset temperature, the water pump is started, the compressor fan is not started, and the actual outlet water temperature can be detected again after waiting for T seconds; otherwise, calculating the demand load, and selecting the modules with the corresponding number to start according to the relation between the demand load and the minimum output capacity of the single module.
The difference between the actual outlet water temperature and the target outlet water temperature is also different 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 difference value between the actual water outlet temperature and the target water outlet temperature, and the 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 outlet water temperature and the target outlet water temperature is the target outlet water temperature minus the actual outlet water temperature, and the heating delta t = the target outlet water temperature-the actual outlet water 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 number of the internal machine.
When the current working condition of the air conditioning system is a refrigeration working condition, the demand load of the refrigeration working condition is calculated by adopting the following formula, and the refrigeration Q Need to = [ (actual outdoor environment temperature-rated outdoor environment temperature) × condensation temperature coefficient + (rated outlet water temperature)Actual water temperature) evaporation temperature coefficient]* (actual number of internal machines started up/total number of internal machines/internal machine over ratio) total external machine rated capacity Q General (1) (ii) a 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, and heating Q Need 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/excess proportion of internal machines) total external machine rated capacity Q General assembly 。
In the two formulas, the condensing temperature refers to the temperature of a refrigerant of the fin heat exchanger, and the evaporating temperature refers to the temperature of the water-side heat exchanger. Except for the actual outdoor environment temperature, the actual water outlet temperature and the actual internal machine starting number in the formula, other parameters are coefficients which are known in advance according to different units.
In one embodiment, the number of boot modules may be calculated according to the following formula, the number of boot modules n = Q Need to /Q General (1) * The total number of outer modules N/(the minimum output capacity ratio α x a of the individual modules), a, is greater than 1.
The number of the startup modules is related to the required load and the minimum output capacity ratio alpha of a single module (a single unit), the principle is that the number of the startup modules is increased as much as possible, the area of the heat exchanger is fully utilized, the energy efficiency of each module is enabled to be optimal, the frequent startup caused by load fluctuation is avoided, the startup number is calculated by alpha 1.2, namely A can be 1.2, and the specific value of A can be flexibly adjusted according to the requirement.
And if the calculated result of the number N of the startup modules is larger than the total number N of the external modules, the number of the startup 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 of the outdoor environment temperature from low to high; and/or when the current working condition of the air conditioning system is a heating working condition, sequentially controlling the modules to start up according to the sequence of the outdoor environment temperature from high to low.
The calculation principle of the startup number is that as many startup modules as possible are provided with a certain margin to reduce frequent startup and shutdown adjustment. The technical scheme has the advantages that under the same load output, the number of started modules is increased, the heat exchange area is increased, and the energy efficiency is improved.
After all the modules needing to be started are started, the modules finish initialization and enter a stable stage, and then the frequency adjusting step can be executed.
When the air conditioning system adopts a 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, maintains the frequency (corresponding to a frequency maintaining instruction) when the capacity output is matched with the user demand capacity, increases the frequency (corresponding to a single-module frequency increasing instruction or a multi-module frequency increasing instruction) when the capacity output is smaller than the user demand capacity, and decreases the frequency (corresponding to a single-module frequency decreasing instruction or a multi-module frequency decreasing instruction) when the capacity output is larger than the user demand capacity. And detecting the actual water outlet temperature at each interval T and calculating to obtain the change rate a.
In refrigeration, a = (actual outlet water temperature) T Actual outlet water temperature T-1 )/T；
In heating, a = (actual outlet water temperature) T-1 Actual outlet water temperature T ) T, actual outlet water temperature T Refers to the actual outlet water temperature at time T T-1 Refers to the actual outlet water temperature at time T-1.
In one embodiment, whether to specifically increase or decrease the frequency may be specifically determined according to the following table.
TABLE 1 frequency variation relationship table corresponding to matching degree of unit output capability and user demand capability
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, keeping the current state, and re-entering the load detection after the interval of corresponding time.
When the load detection meets the condition of increasing frequency, the method is adjusted as follows:
(1) Raising the frequency of the module which is operated at the non-highest frequency and has the highest inlet air temperature (the highest outdoor environment temperature) during heating; and the frequency of the module which is operated at the non-highest frequency and has the lowest air inlet temperature (the lowest outdoor environment temperature) is increased during the refrigeration.
(2) If all the started modules reach the highest frequency, starting the shutdown module with the highest inlet air temperature during heating; and starting the shutdown module with the lowest air inlet temperature during refrigeration.
(3) If all modules have been started and the highest frequency is reached, the current state is maintained.
(4) If the frequency increasing conditions that delta t is larger than or equal to z and a is smaller than or equal to-y are met, all non-highest frequency operation modules with the lowest air inlet temperature are subjected to frequency increasing during heating; and (3) increasing the frequency of all the modules which are operated at the non-highest frequency except the highest temperature of the inlet air during refrigeration.
When the load detection meets the condition of reducing the frequency, the method is adjusted as follows:
(1) The module which is operated at the lowest non-lowest frequency and has the lowest air inlet temperature reduces the frequency during heating; and the non-lowest frequency operation module with the highest inlet air temperature reduces the frequency during refrigeration.
(2) If all the started modules reach the lowest frequency, the starting module with the lowest air inlet temperature stops when heating is performed; and the starting module with the highest air inlet temperature stops during refrigeration.
(3) If only one module is powered on and reaches the lowest frequency, the module is shut down.
(4) If the frequency reduction condition that delta t is less than-z and a is more than or equal to y is met, all modules which are not operated at the lowest frequency and have the highest air inlet removal temperature are subjected to frequency reduction during heating; and all the modules which are not operated at the lowest frequency except the lowest temperature of the inlet air are used for reducing the frequency during refrigeration.
When the load detection meets the condition of maintaining the frequency, the method is adjusted as follows:
(1) The difference between the lowest value and the highest value of the inlet air temperature of all the modules in operation is less than 1 ℃, and the inlet air temperature is kept unchanged, otherwise, the inlet air temperature is adjusted according to the following steps (2) and (3);
(2) The module which has the lowest air inlet temperature and runs at the lowest frequency is used for reducing the frequency, and the module which has the highest air inlet temperature and runs at the highest frequency is used for increasing the frequency;
(3) During refrigeration, the module which has the highest inlet air temperature and runs at the lowest frequency is subjected to frequency reduction, and the module which has the lowest inlet air temperature and runs at the highest frequency 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 started module meets 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 sequence of the difference value between the outdoor environment temperature and the low-pressure temperature from large to small according to the relation between the number of the started modules and the preset number.
In a specific embodiment, when the number of started modules is less than a preset number, controlling a 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 larger than or equal to the preset number, selecting n x 1/a modules to enter defrosting operation according to the sequence that the difference value between the outdoor environment temperature and the low-pressure temperature is from large to small, wherein n is the number of the started modules, and a is the preset number.
When the heat pump unit is a heat pump unit, the heat pump unit generally determines whether the defrosting condition is met by the 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 a preset value X corresponding to the current air inlet temperature, the finned heat exchanger is considered to be frosted more and needs to be operated in a defrosting mode, the four-way valve is reversed, and the finned heat exchanger is used as a condenser and enters the defrosting mode.
Judging whether the started unit (module) meets the defrosting condition, wherein the evaporation temperature in the actual product is generally low-pressure temperature (saturation temperature corresponding to low-pressure) detected by a low-pressure sensor or the temperature of a refrigerant inlet pipe of a fin heat exchanger, and the schematic diagram of fig. 2 is taken as an example, delta T = T Air intake -T Low pressure ，T Air intake Is the outdoor ambient temperature (i.e. the temperature of the inlet air to the finned heat exchanger), T Low pressure When the temperature detected by the low-pressure sensor is delta T larger than X, the corresponding module meets the defrosting condition.
And sequencing the units (modules) meeting the defrosting condition according to delta T, and determining the number of the modules which simultaneously operate for defrosting according to the relation between the number n of started units and the preset number a, so as to ensure the positive output capacity of the whole system during defrosting.
n < a is that only 1 module is allowed to enter defrosting;
and when n is larger than or equal to a, allowing n x 1/a modules to enter defrosting operation.
Wherein the preset number a is greater than (1+Q Frosting up /Q Defrosting cream ) Minimum integer of (2), Q Frosting up Heating capacity when the air conditioning system satisfies the defrosting condition, Q Defrosting cream The refrigerating capacity of the system during defrosting is improved.
The invention also protects a multi-module air conditioning system which comprises a controller, wherein the controller adopts the control method of the multi-module air conditioning system in the technical scheme to control the multi-module air conditioning system.
The present invention also protects a computer readable storage medium for storing a computer program which, when running, executes the control method of the multi-module air conditioning system of the above technical solution.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (23)
1. A control method of a multi-module air conditioning system is characterized by comprising a frequency adjusting step in the operation process of the air conditioning system, wherein the frequency adjusting step comprises the following steps:
step 1, obtaining a corresponding frequency adjusting instruction according to the matching degree of the current output capability of the air conditioning system and the user demand capability;
and 2, controlling the corresponding modules to perform corresponding frequency adjustment or start and stop according to the current working condition and the frequency adjustment instruction of the air conditioning system and the outdoor environment temperature of each started module.
2. The method for controlling a multi-module air conditioning system 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 adjusting instruction is a single-module frequency increasing instruction, the module with the highest outdoor environment temperature and not reaching the highest operation frequency is controlled to perform frequency increasing; and/or the presence of a gas in the gas,
if the frequency adjusting instruction is a multi-module frequency increasing instruction, all started modules except the started modules with the highest running frequency and the lowest outdoor environment temperature are controlled to increase the frequency.
3. The method as claimed in claim 2, wherein if the frequency adjustment command is a single-module up-conversion command or a multi-module up-conversion command, and all the powered-on modules have the highest operating frequency, controlling the powered-off module with the highest outdoor ambient temperature among all the powered-off modules to be powered on.
4. The method as claimed in claim 1, wherein in step 2, when the current operating mode of the air conditioning system is a cooling operating mode, if the frequency adjustment command is a single-module frequency-increasing command, the module with the lowest outdoor ambient temperature and not reaching the highest operating frequency is controlled to perform frequency-increasing; and/or the presence of a gas in the atmosphere,
if the frequency adjusting instruction is a multi-module frequency increasing instruction, all started modules except the started module which does not reach the highest operating frequency and has the highest outdoor environment temperature are controlled to increase the frequency.
5. The method as claimed in claim 4, wherein if the frequency adjustment command is a single-module up-conversion command or a multi-module up-conversion command, and all the powered-on modules have the highest operating frequency, controlling the powered-on module with the lowest outdoor ambient temperature among all the powered-off modules.
6. The method as claimed in 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 reduction command, the module with the lowest outdoor environment temperature and not reaching the lowest operation frequency is controlled to perform frequency reduction; and/or the presence of a gas in the gas,
if the frequency adjusting instruction is a multi-module frequency reduction instruction, controlling all started modules which do not reach the lowest operating frequency and have the highest outdoor environment temperature to carry out frequency reduction.
7. The method as claimed in claim 6, wherein if the frequency adjustment command is a single-module down-conversion command or a multi-module down-conversion command, and all the modules that have been turned on have the lowest operating frequency, the module with the lowest outdoor ambient temperature among all the turned-on modules is controlled to be turned off, or when only one module is turned on, the module is turned off.
8. The method as claimed in claim 1, wherein in the step 2, when the current operating mode of the air conditioning system is a cooling operating mode, if the frequency adjustment command is a single-module frequency reduction command, the module with the highest outdoor environment temperature and not reaching the lowest operating frequency is controlled to perform frequency reduction; and/or the presence of a gas in the atmosphere,
if the frequency adjusting instruction is a multi-module frequency reduction instruction, controlling all started modules which do not reach the lowest operating frequency and are except the lowest outdoor environment temperature to carry out frequency reduction.
9. The method as claimed in claim 8, wherein if the frequency adjustment command is a single-module down-conversion command or a multi-module down-conversion command and all the powered-on modules have the lowest operating frequency, the module with the highest outdoor ambient temperature among all the powered-on modules is controlled to be powered off, or when only one module is powered on, the module is powered off.
10. The method as claimed in claim 1, wherein in step 2, when the current operating mode of the air conditioning system is a heating operating mode or a cooling operating mode and the frequency adjustment command is a single-module up-conversion command or a multi-module up-conversion command, if all the modules have the highest operating frequency, the current state is maintained.
11. The method for controlling a multi-module air conditioning system according to claim 1, wherein in 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 command for maintaining the current frequency, if the absolute value of the difference between the highest value and the lowest value of the outdoor ambient temperature of all the started modules is smaller than a preset value, the frequency of all the started modules is kept unchanged;
otherwise, when the current working condition of the air conditioning system is a heating working condition, controlling the frequency of the module with the lowest outdoor environment temperature and without the lowest operation frequency to be reduced, and simultaneously controlling the frequency of the module with the highest outdoor environment temperature and without the highest operation frequency to be increased; and/or when the current working condition of the air conditioning system is a refrigeration working condition, controlling the frequency of the module with the highest outdoor environment temperature and without reaching the lowest operation frequency to be reduced, and simultaneously controlling the frequency of the module with the lowest outdoor environment temperature and without reaching the highest operation frequency to be increased.
12. A control method for a multi-module air conditioning system as claimed in any one of claims 1 to 11, wherein the air conditioning system is a water chiller.
13. The method as claimed in claim 12, wherein in 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 variation rate of the actual outlet water temperature is less than or equal to a preset minimum value, the frequency adjustment command is a multi-module up-conversion command, otherwise, the frequency adjustment command is a single-module up-conversion command; and/or the presence of a gas in the gas,
and when the deviation between the actual outlet water temperature and the target outlet water temperature of the air conditioning system is smaller than a preset minimum value and the change rate of the actual outlet water temperature is larger than or equal to a preset maximum value, the frequency adjusting instruction is a multi-module frequency reduction instruction, otherwise, the frequency adjusting instruction is a single-module frequency reduction instruction.
14. The method of claim 12, further comprising a step of turning on the air conditioning system, the step of turning on comprising:
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 starting the water pump, and not starting the compressor fan; otherwise, calculating the demand load, and selecting the modules with the corresponding number to start up according to the relation between the demand load and the minimum output capacity of the single module.
15. The control method of a multi-module air conditioning system as claimed in claim 14, wherein when the current operating condition of the air conditioning system is a cooling operating condition, the difference between the actual leaving water temperature and the target leaving water temperature is the actual leaving water temperature minus the target leaving water temperature; and/or the presence of a gas in the atmosphere,
and 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.
16. The control method of a multi-module air conditioning system as claimed in claim 14, wherein when the current operation condition of the air conditioning system is a cooling operation condition, the demand load of the cooling operation condition, cooling Q, is calculated using the following formula Need 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 started up/total number of internal machines/internal machine over ratio) total external machine rated capacity Q General assembly (ii) a 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, and heating Q Need to = [ (nominal ambient temperature-actual ambient temperature) × evaporation temperature coefficient + (actual water temperature-nominal water temperature) × condensation temperature systemNumber of]* (actual number of internal machines started up/total number of internal machines/internal machine over ratio) total external machine rated capacity Q General assembly 。
17. The method of claim 14, wherein the number of the start-up modules is calculated according to the following formula, the number of the start-up modules being n = Q Need to /Q General (1) * The total number of outer modules N/(the minimum output capacity ratio of individual modules α × a), a is greater than 1.
18. The control method of the multi-module air conditioning system according to claim 14, wherein when the number of the startup modules is plural, if the current working condition of the air conditioning system is a cooling working condition, the startup of the modules is sequentially controlled according to the sequence of the outdoor ambient temperature from low to high; and/or the presence of a gas in the gas,
and when the current working condition of the air conditioning system is a heating working condition, sequentially controlling the modules to start up according to the sequence of the outdoor environment temperature from high to low.
19. The control method of a multi-module air conditioning system as set forth in claim 12, further comprising a defrosting step of the air conditioning system, the defrosting step comprising:
judging whether each started module meets a defrosting condition or not;
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 relationship between the number of the started modules and the preset number and the sequence from large to small of the difference value between the outdoor environment temperature and the low-pressure temperature.
20. The control method of a multi-module air conditioning system as claimed in claim 19, wherein when the number of the started modules is less than a preset number, controlling a module having a largest difference between the outdoor ambient temperature and the low pressure temperature to enter a defrosting operation; and/or the presence of a gas in the gas,
when the number of the started modules is larger than or equal to the preset number, selecting n x 1/a modules to enter defrosting operation according to the sequence that the difference value between the outdoor environment temperature and the low-pressure temperature is from large to small, wherein n is the number of the started modules, and a is the preset number.
21. The method for controlling a multi-module air conditioning system as recited in claim 20 wherein said predetermined number is greater than (1 + q) Frosting up /Q Defrosting cream ) The smallest integer of (1), said Q Frosting Heating capacity when the air conditioning system satisfies the defrosting condition, Q Defrosting cream The refrigerating capacity of the air conditioning system during defrosting is realized.
22. 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 21.
23. A computer-readable storage medium storing a computer program, wherein the computer program is executed to perform the control method of a multi-module air conditioning system according to any one of claims 1 to 21.
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