CN111238101A - Control method of multi-press multi-module unit - Google Patents
Control method of multi-press multi-module unit Download PDFInfo
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- CN111238101A CN111238101A CN201911015127.XA CN201911015127A CN111238101A CN 111238101 A CN111238101 A CN 111238101A CN 201911015127 A CN201911015127 A CN 201911015127A CN 111238101 A CN111238101 A CN 111238101A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
Abstract
The invention provides a control method of a multi-press multi-module unit, the multi-module unit comprises a controller and a plurality of groups of multi-press modules connected in parallel, each group of multi-press modules comprises a main control panel and a plurality of compressors, each compressor in each group is respectively connected with the main control panel of the group through a press control panel, the signal output end of the controller is at least connected with the signal input end of the main control board of one group of the multi-press modules, the main control board comprehensively collects the operation data of the unit according to the control signal of the controller, and carrying out multiple data coupling calculation by a pre-stored calculation method to obtain the optimal operating frequency of the unit, determining the number of the units of the multi-press modules participating in operation, and forming control signals and transmitting the control signals to the main control boards of other groups of multi-compressor modules to control the number of the compressors participating in operation and the operation frequency of each compressor.
Description
Technical Field
The invention belongs to the technical field of heating ventilation, and particularly relates to a control method of a multi-press multi-module unit.
Background
The heat pump water heater is more and more used due to the advantages of cost saving, low energy consumption, no potential leakage and high heating efficiency, a user needs hot water all the year round, particularly in winter, the hot water consumption is large, the temperature of water on a condensation side is increased from 5 ℃ to 55 ℃, great difficulty is brought to the design and operation of a heat pump, and a conventional heat pump air conditioner is difficult to adapt to the wide temperature change range, so that the common household heat pump water heater cannot meet the water demand of the user.
In order to provide enough heat, a simple early solution is to use a high-power variable-frequency compressor, but the high-power variable-frequency compressor is few in variety and high in price, and economic burden of enterprises and users is increased, so that a heating unit formed by a multi-compressor or a multi-module multi-compressor is appeared, the heating unit is connected with a plurality of compressors in parallel, sufficient hot water is supplied during heating, and the requirement of hot water for users is met. In the working process of a common multi-compressor or multi-module multi-compressor heating unit, a plurality of compressors need to work synchronously, the energy consumption is large, in order to save energy, a conventional variable frequency compressor is usually adopted, the operating frequency of each compressor is uniformly adjusted according to the user quantity and the water temperature, the effect of reducing consumption is achieved, but because the frequency change range of the variable frequency compressor is 30HZ-120HZ, the capacity adjustment range is 46% -100%, the capacity range of a minimum indoor unit is only 1800W-2200W, the capacity adjustment range of the whole unit cannot meet the capacity requirement of the minimum indoor unit, a bypass unloading method needs to be adopted to solve the problem, the solution effect is not good, the existing situation of redundant work of the variable frequency compressor still occurs, the problem cannot be solved by a conventional control mode, the problem of low energy efficiency ratio of the whole unit in a low load state exists, and energy waste is caused, the requirements of national energy conservation and emission reduction and high-efficiency energy conservation of users are not met.
Disclosure of Invention
The invention mainly aims to solve the problems and the defects and provides a control method of a multi-module unit of a press, which can realize the energy-saving and balanced operation of hot water and a heating unit.
In order to achieve the aim, the invention provides a control method of a multi-press multi-module unit, which has the technical scheme that:
a control method of a multi-press multi-module unit comprises a controller and a plurality of groups of multi-press modules connected in parallel, each group of multi-press modules comprises a main control panel and a plurality of compressors, each compressor in each group is respectively connected with the main control panel of the group through a press control panel, the signal output end of the controller is at least connected with the signal input end of the main control board of one group of the multi-press modules, the main control board comprehensively collects the operation data of the unit according to the control signal of the controller, and carrying out multiple data coupling calculation by a pre-stored calculation method to obtain the optimal operating frequency of the unit, determining the number of the units of the multi-press modules participating in operation, and forming control signals and transmitting the control signals to the main control boards of other groups of multi-compressor modules to control the number of the compressors participating in operation and the operation frequency of each compressor.
Further, the operation data includes operation current, ambient temperature, outlet water temperature or return water temperature of each compressor, and system pressure of compressor operation.
Furthermore, a comparison table of the operation frequency interval of the compressors, the time of putting each compressor into operation, the time of quitting the operation of each compressor and the number of the compressors participating in the operation is prestored in the integrated controller, the operation frequency of the compressors is calculated according to the operation data, corresponding control data are selected from the comparison table, and the operation time of each compressor and the number of the compressors participating in the operation are controlled while the operation frequency of each compressor is controlled.
Further, the number of compressors involved in the operation is calculated using the formula N ═ epsilon Δ T, wherein,
n, the number of compressors participating in operation is an integer;
epsilon, a constant;
and delta T, the difference value between the required water temperature input by the controller and the current water temperature of the unit.
Further, the compressors participating in the operation are determined according to the comparison value of the accumulated operation time of each compressor, and a formula is determined: fn＝Min(t1,t2,t3,t4……tn) Wherein, in the step (A),
Fna compressor participating in operation;
tnthe running time of each compressor.
Further, the running time of the unit is subjected to cyclic calculation to obtain values, and which compressor is put into operation is determined according to the accumulated running time of each compressor.
Further, the main control board is integrated with the controller or integrated with the multi-press module.
Further, the coupling calculation for confirming the operating frequency of the compressor adopts the following formula: k is1∝Tha+k2∝ΔThw+ β, wherein,
f, the running frequency of the unit;
K1，K2coefficient of the linear transformation;
Thaambient temperature;
ΔThwthe temperature difference between the actual water supply temperature and the control temperature;
β, may be constant using a coefficient.
Further, the coefficient K1Using the formula K1＝α1∝Ι/Ιa+ε1And calculating to obtain the result that, wherein,
the running current in the running process of the compressor;
Iastandard current value of compressor operation;
α1coefficient, which may be constant;
ε1compensation value ofAnd may be constant.
Further, the coefficient K2Using the formula k2＝α2∝LP/LPa+ε2And calculating to obtain the result that, wherein,
α2coefficient, which may be constant;
LPoperating pressure during operation of the compressor;
LPacalculating standard operation pressure in the operation process of the compressor and power meter of the compressor;
ε2the compensation value may be a constant.
In summary, compared with the prior art, the control method of the multi-press multi-module unit provided by the invention has the following advantages:
1. carrying out coupling calculation through multiple data according to user requirements to obtain the optimal operating frequency of the unit, thereby realizing variable frequency regulation on each compressor, improving the efficiency and saving the energy;
2. determining the operation time of each compressor for input and exit through data accumulation and coupling calculation so as to ensure that the operation state of each compressor reaches the best and the operation balance of all the compressors;
3. the multi-module combination saves energy and operates in a balanced way, and the service life of the compressor is ensured.
Description of the drawings:
FIG. 1: the invention relates to a schematic composition diagram of a multi-press unit system;
FIG. 2: the invention discloses a schematic composition diagram of a multi-press multi-module unit system;
the device comprises a multi-press module 1, a controller 2, a main control panel 3 and a press control panel 4.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description.
In the present invention, a full frequency conversion hot water and heating unit is taken as an example to describe a specific implementation manner of the multi-compressor unit and the control method of the multi-compressor multi-module unit provided by the present invention.
The invention firstly provides a control method of a multi-compressor multi-module unit, the unit comprises a controller 2, a main control panel 3 and a multi-compressor module 1, the multi-compressor module 1 comprises a plurality of compressors connected in parallel, each compressor is respectively connected with the main control panel 3 through a corresponding compressor control panel 4, the main control panel 3 comprehensively collects the operation data of the unit according to a user control signal transmitted by the controller 2, and performs coupling calculation of multiple data through a pre-stored calculation method to obtain the optimal operation frequency of the unit and the number of the compressors participating in operation, form a control signal and transmit the control signal to the compressor control panels 4, and control the number of the compressors participating in operation and the operation frequency of each compressor.
Example one
In a first embodiment provided by the present invention, a single-module multi-press heating unit is provided, as shown in fig. 1, which comprises a set of multi-press modules 1 and a controller 2, wherein each multi-press module 1 comprises a plurality of parallel variable frequency compressors, the operation frequency of which can be changed as required, the compressors are connected with an evaporator and other components through pipelines to form a heating heat exchange system, each compressor is respectively connected with a press control board 4, the working state of the compressors connected in series with the compressor is controlled by the press control board 4, including start-up, stop and operation frequency, the signal input end of the press control board 4 is connected with the signal output end of a main control board 3, the signal input end of the main control board 3 is connected with the signal output end of the controller 2, the controller 2 is a remote controller, a wire controller and the like capable of inputting, receiving and changing heating and water demand signals, and a user can input control information through the, or the operation such as heating information is changed through the controller 2, the controller 2 is the conventional product, and the requirements and the limitations are not required, and any product which is present or may appear in the future can be applied to the technology provided by the invention. In the present embodiment, the main control board 3 is integrated with the multi-press module 1.
After receiving the demand signal of the user, the controller 2 transmits the signal to the main control panel 3, the main control panel 3 receives the information of water consumption and warming up of the user, meanwhile, all sensors arranged in the heating unit are connected with the main control panel 3, the main control panel 3 can detect and collect the operation data of the heating unit in real time through all sensors, including but not limited to the data of the running current of a compressor, the ambient temperature, the outlet water temperature, the return water temperature, the system pressure and the like, a calculation program and a control system are prestored in the main control panel 3, the calculation program carries out calculation and analysis on the multiple data according to a prestored coupling calculation method, the control system determines the optimal operation frequency of the heating unit according to the calculation result and/or the analysis result, and forms a corresponding control program to generate a control signal and transmit the control signal to each press control board 4, thereby controlling the working state of each compressor.
In this embodiment, the operation frequency of the heating unit is calculated by using a formula:
frequency calculation formula: k is1∝Tha+k2∝ΔThw+β(1)
F, calculating the obtained running frequency of the heating unit;
K1，K2the coefficient can be an empirical constant or a variable and can be obtained by calculation;
Thaambient temperature, i.e., the outdoor temperature of the compressor operating environment;
ΔThwthe difference between the actual water supply temperature and the user required (control) water temperature is detected in real time after receiving the water and heating signals, and compared with the control temperature input by the user on the controller 2, the difference is taken, the return water temperature or the outlet water temperature of the heating equipment to be used can be determined on the controller 2 as the control temperature, or can be preset by the unit, the actual outlet water temperature or the temperature difference between the actual return water temperature and the control temperature is calculated, the temperature value to be used is automatically determined and selected according to the control requirement, when the user uses a certain heating equipment, the outlet water temperature of the outlet end of the equipment is taken as the control temperature, delta ThwThe main control board 3 adjusts the running condition of the multi-press module 1 according to the difference between the actual outlet water temperature and the control temperature at the outlet end of the equipment, and the principle that the return water temperature is used as the control temperature is the same;
β, using coefficients, may be empirical constants.
At the beginning of design, the invention carries out a great deal of experimental verification on different control demand conditions, obtains abundant experimental data, and obtains β values and K through accumulation in experience1，K2Value, and verified that when K1，K2When the value is variable changing along with the change of the operation parameters, the obtained optimal operation frequency of the unit is more effective, the operation state of each compressor is better, and the effects of constant-temperature heating and energy conservation are better. In this example, K obtained by a large number of experiments1，K2The calculation formula of the value is:
K1＝α1∝Ι/Ιa+ε1(2)
wherein: i: the system operating current;
Iathe standard current value of the system;
α1coefficient, which may be an empirical constant;
ε1the compensation value may be an empirical constant.
k2＝α2∝LP/LPa+ε2(3)
Wherein, α2Coefficient, which may be an empirical constant;
LPthe system operating pressure;
LPathe standard operating pressure of the system is related to the ambient temperature, when the variable frequency compressor leaves a factory, a power meter of the compressor is contained in a factory parameter table, and the standard operating pressure can be obtained by looking up the power meter for calculation;
ε2the compensation value may be an empirical constant.
Similarly, α1、α2、ε1、ε2The empirical value obtained by experiment is a constant.
The main control board 3 prestores the above three formulas, when receiving the control signal from the controller 2, it detects and collects multiple data, the computing system uses the formulas to do K according to the preset algorithm1，K2And f value calculation, obtaining the optimal operation frequency of the unit, and controlling the system to allocate and participate in operationThe number of the compressors in the line and the running speed of each compressor so as to achieve the optimal energy-saving running mode of the whole unit. The heating unit obtains a corresponding table of the operation frequency and the operation time of each compressor through a large amount of experimental verification and long-time data accumulation, the operation frequency forms a plurality of intervals, each interval corresponds to one operation time, meanwhile, a corresponding table can be formed by multiple corresponding relations of each operation frequency interval, the operation time of each compressor and the number of the compressors participating in operation, the corresponding table is prestored in a control system of the main control panel 3, the real-time optimal operation frequency obtained through the coupling calculation of multiple data is taken out from the corresponding table, and the operation time of each compressor needing to participate in operation is determined, so that the operation state of each compressor is ensured to be optimal, and the operation balance of all the compressors is ensured.
In the present embodiment, the compressors are arranged in parallel, the operating states of the compressors are not interfered and affected by each other, and the compressors receive the signal control of the compressor control board 4 connected thereto to determine the start-up and shut-down and the adjustment of the operating frequency. Meanwhile, the variable frequency compressor is adopted, the main control panel can detect and collect all relevant data at regular time, and carry out coupling calculation of multiple data, and adjust the operating frequency in time, thereby achieving the purpose of high efficiency and energy saving. When the controller 2 receives a control signal from a user, the method provided by the embodiment can be used for adjusting the real-time operation frequency after calculation and comparison regardless of the existing operation condition of the unit. The calculation system and the control system are prestored in the main control board 3, form a control program after calculation, and respectively transmit the control program to each press control board 4 in a control signal mode, and each press control board 4 controls the running state of the variable frequency compressor connected in series with the press control board 4 according to the control signal received by the press control board 4 without mutual interference.
Example two
The technical solution of the second embodiment of the present invention is different from the first embodiment in that in the present embodiment, the main control board 3 is integrated with the controller 2, the controller 2 can input, receive, change and use the warm water demand signal and transmit the control signal to the main control board 3 as described above, and the main control board 3 performs the operations of the coupling calculation, the formation of the control program, and the like as described above.
EXAMPLE III
The two embodiments provided in the foregoing are control methods of a single-module multi-press heating unit, and the present invention further provides a third embodiment, which is a control method of a multi-press multi-module heating unit, as shown in fig. 2, the multi-press multi-module heating unit includes a controller 2 and a plurality of sets of multi-press modules 1, the plurality of sets of multi-press modules 1 are arranged in parallel, the controller 2 can input, output and modify control signals as described in the foregoing, the multi-press module 1 includes a plurality of sets of frequency conversion compressors and press control boards 4 connected in parallel and a main control board 3 integrated with the main control board, when the plurality of sets of multi-press modules 1 are used in parallel, firstly, any one set of multi-press modules 1 is defined as a main module, the other sets of multi-press modules 1 are defined as auxiliary modules, the controller 2 is connected with the main control board 3 integrated with the main module, when the main control board 3 of the main module receives a demand signal of the, as described above, multiple data are collected in real time, the coupling calculation is performed as described above, and the data are compared with the data in the pre-stored comparison table, so as to determine the operation frequency of the compressor in the auxiliary module and the number of compressors to be put into/out of operation.
The computing system and the control system can be prestored in the main control board 3 of the main module, and the main control boards 3 of other modules only receive the control signals formed by the main control board 3 of the main module and transmit the control signals to the press control boards 4 in the module group, so that the running state of the compressors in the module group is controlled. Besides the main module, the main control panel 3 of another one or two modules also prestores a computing system and a control system, and is simultaneously connected with the main control panel 3 of the main module and the controller 2, and simultaneously receives the control signal of the controller 2 with the main module, when the main control panel 3 of the main module fails, the other two main control panels 3 carry out corresponding control operation in sequence according to a preset sequence. For example, in the multi-module multi-press machine set, there are 10 sets of multi-press modules 1, wherein module 1 can be defined as a main module, a computing system and a control system are prestored in a main control board 3, data computation and control signal output are completed by the computing system and the control system, meanwhile, the computing system and the control system are prestored in the main control boards 3 of modules 2 and 3, the control signals sent by the controller 2 can be received at the same time, but the control signals do not participate in computation under normal conditions, the control signals can not be output, and the control signals of module 1 are received with other modules to control the running state of each compressor in the module, but the control signals sent by the controller 2 are received by modules 2 and 3 for a preset time, for example, after 10s, because the main control board 3 of module 1 serving as the main module fails due to various reasons, the computing system and the control system cannot be calculated and output, the main control board 3 of module 2 prestores the computing system and the control system to start, and (3) detecting, acquiring, calculating and outputting control signals of multiple data, and similarly, when the calculating system and the control system of the main control panel 3 of the module No. 2 are also failed, the main control panel 3 of the module No. 3 can realize the function of a main control module. By analogy, corresponding computing systems and control systems can be prestored in the main control boards 3 of all the modules and connected with the controller 2, control operation is carried out in the manner described above, and only one main control board 3 of one module is put into the work of computing and outputting control signals when heating is required no matter how many modules are prestored in the main control boards 3.
In the present embodiment, the main control board 3 serving as the main module performs various coupling calculations and generates a corresponding control program in the same manner as in the first embodiment. Similarly, a corresponding table of multiple correspondence relationships between the operation frequency interval and the operation time of each compressor and the number of the compressors participating in the operation can be prestored in the main control board 3, the real-time optimal operation frequency obtained through the coupling calculation of multiple data is taken as a value in the corresponding table, and the time for each compressor needing to participate in the operation to be put into and taken out of operation is determined, so that the operation state of each compressor is ensured to be optimal, and the operation balance of all the compressors is ensured.
In the above three embodiments, the loading number N of the compressors put into operation may be selected from a pre-stored empirical data mapping table according to the calculated frequency, or may be selected according to the water temperature (control temperature) T required by the usersAnd the current water temperature TwIs determined by the difference Δ T of:
the formula: n ═ epsilon Δ T (4)
Wherein epsilon is an empirical constant, N is an integer, and when the calculated value of epsilon delta T has decimal place, the integer value can be directly taken by rounding. As previously mentioned, the user requests a water temperature, i.e., the control temperature TsCan be the water outlet temperature or the water return temperature of heating equipment to be used by a user, and correspondingly, the current water temperature TwThe current outlet water temperature or the return water temperature corresponding to the equipment is also obtained. When a single-module multi-compressor heating unit is adopted, when the calculated N value is larger than the number of compressors used in parallel in the system, all the compressors are put into operation and operate at the maximum frequency. When a multi-module multi-press heating unit is adopted, when the calculated N value is smaller than the number of all compressors used in parallel in the system, the number of the multi-press modules needing to be put into operation is determined, and according to a preset sequence, after all the compressors in the previous module are put into operation, the next module is used for number supplement, and the condition that only part of the compressors in one group or two groups of multi-press modules participating in operation are not allowed to operate is not allowed, for example, the multi-module multi-press heating unit comprises 6 groups of multi-press modules 1, 4 compressors are connected in parallel in each group of multi-press modules 1, when the calculated N value is 17, 5 groups of multi-press modules are required to operate simultaneously, wherein all the compressors in the previous four groups of modules are operated, only one compressor in the fifth group of modules is operated, all the compressors in the remaining one group of modules are standby, and all the compressors in the previous three groups of multi-press modules are not allowed to operate, the last three groups of modules respectively have 3, 1 or 2, 1 compressors to put into operation, or the first five groups of modules only have 3 compressors to operate, and the last group of modules has 1 compressor to operate in the same situation is not allowed. In the main control panel 2, the working state and the running condition of each compressor are prestored and recorded at the same time, and when the compressors in the running state are distributed, the input sequence is adjusted on the basis of meeting the principle, so that the running time and the running frequency of each compressor are relatively balanced, the condition that part of the compressors work for a long time and are aged in advance or the efficiency is reduced is avoided, and the whole unit is enabled to be wholeThe running state of the device is more stable.
The compressors involved in the operation are determined on the basis of the comparison of the operating times of the compressors, namely:
the formula: fn＝Min(t1,t2,t3,t4,…………tn)(5)
Wherein Fn, the compressor which participates in the operation;
tn, the cumulative operating time of each compressor.
After the controller 2 receives and sends out a control signal, the main control panel 3 detects and collects multiple data, calculates the applicable frequency of unit operation, and determines the number of compressors participating in operation, so that for further energy saving, the detection and collection of related data need to be carried out in real time or at regular time, and the applicable operating frequency, the number of compressors participating in operation and the operating time are adjusted in time. And carrying out circulating calculation on the accumulated running time of the compressors to obtain values, and determining which group and which compressor are put into operation according to the accumulated running time length of each group and each compressor, so as to further ensure the balance of all running times and ensure the service life of the compressors.
In the three embodiments provided by the invention, the control method of the multi-compressor heating unit and the multi-module multi-compressor heating unit is suitable for variable-frequency hot water and heating products, and can also be widely applied to the control of the compressor units of other types of products with a plurality of compressors, such as a simple hot water unit, a heating unit, a refrigerating unit and other products. The running time, the number and the running time of the compressors can be inquired and confirmed in a comparison table formed by empirical values according to the running frequency of the unit obtained by calculation, and can also be obtained by the formulas 4 and 5, and the formulas 4 and 5 can be simultaneously suitable for calculating the number and the running time of the compressors which participate in the running under two modes of a single-module multi-compressor unit and a multi-module multi-compressor unit.
In summary, compared with the prior art, the control method of the multi-press warming machine set and the multi-module multi-press machine set provided by the invention has the following advantages:
1. carrying out coupling calculation through multiple data according to user requirements to obtain the optimal operating frequency of the unit, thereby realizing variable frequency regulation on each compressor, improving the efficiency and saving the energy;
2. determining the operation time of each compressor for input and exit through data accumulation and coupling calculation so as to ensure that the operation state of each compressor reaches the best and the operation balance of all the compressors;
3. the multi-module combination saves energy and operates in a balanced way, and the service life of the compressor is ensured.
Similar solutions can be derived as described above in connection with the given solution content. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A control method of a multi-press multi-module unit is characterized in that: the multi-module unit comprises a controller and a plurality of groups of multi-compressor modules connected in parallel, each group of multi-compressor modules comprises a main control panel and a plurality of compressors, each compressor in each group is respectively connected with the main control panel of the group through a compressor control panel, the signal output end of the controller is at least connected with the signal input end of the main control board of one group of the multi-press modules, the main control board comprehensively collects the operation data of the unit according to the control signal of the controller, and carrying out multiple data coupling calculation by a pre-stored calculation method to obtain the optimal operating frequency of the unit, determining the number of the units of the multi-press modules participating in operation, and forming control signals and transmitting the control signals to the main control boards of other groups of multi-compressor modules to control the number of the compressors participating in operation and the operation frequency of each compressor.
2. A control method of a multi-press multi-module unit as claimed in claim 1, characterized in that: the operation data comprises the operation current, the environment temperature, the water outlet temperature or the water return temperature of each compressor and the system pressure of the operation of the compressors.
3. A control method of a multi-press multi-module unit as claimed in claim 1, characterized in that: the main control board is internally pre-stored with a comparison table of the operation frequency interval of the compressors, the time of putting each compressor into and out of operation and the number of the compressors participating in operation, the operation frequency of the compressors is calculated according to the operation data, corresponding control data is selected from the comparison table, and the operation time of each compressor and the number of the compressors participating in operation are controlled while the operation frequency of each compressor is controlled.
4. A control method of a multi-press multi-module unit as claimed in claim 1, characterized in that: the number of compressors involved in the operation is calculated using the formula N ═ epsilon Δ T, where,
n, the number of compressors participating in operation is an integer;
epsilon, a constant;
and delta T, the difference value between the required water temperature input by the controller and the current water temperature of the unit.
5. A control method of a multi-press multi-module unit as claimed in claim 1, characterized in that: the compressors involved in the operation are determined according to the comparison value of the accumulated operation time of each compressor, and a formula F is determinedn＝Min(t1,t2,t3,t4……tn) Wherein, in the step (A),
Fna compressor participating in operation;
tncumulative operating time of each compressor.
6. The control method of a multi-press multi-module unit as claimed in claim 5, wherein: and carrying out cyclic calculation and value taking on the running time of the compressors, and determining which compressor is put into operation according to the accumulated running time of each compressor.
7. A method of controlling a multi-press multi-module unit as claimed in claim 1, characterized in that: the main control board is integrated with the controller or integrated with the multi-press module.
8. A control method of a multi-press multi-module unit according to any one of claims 1 to 7, characterized in that: the coupling calculation to confirm the compressor operating frequency uses the following formula: k is1∝Tha+k2∝ΔThw+ β, wherein,
f, the running frequency of the unit;
K1，K2coefficient of the linear transformation;
Thaambient temperature;
ΔThwthe temperature difference between the actual water supply temperature and the control temperature;
β, may be constant using a coefficient.
9. The control method of a multi-press multi-module unit as claimed in claim 8, wherein: coefficient K1Using the formula K1＝α1∝Ι/Ιa+ε1And calculating to obtain the result that, wherein,
i, operating current in the operation process of the compressor;
ia, standard current value of the running of the compressor;
α 1, coefficient, which may be a constant;
ε 1, the offset, may be a constant.
10. The control method of a multi-press multi-module unit as claimed in claim 8, wherein: the coefficient K2 adopts the formula K2＝α2∝LP/LPa+ε2And calculating to obtain the result that, wherein,
α2coefficient, which may be constant;
LPoperating pressure during operation of the compressor;
LPacalculating standard operation pressure in the operation process of the compressor and power meter of the compressor;
ε2the compensation value may be a constant.
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| CN201911015127.XA Pending CN111238101A (en) | 2019-10-24 | 2019-10-24 | Control method of multi-press multi-module unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112254299A (en) * | 2020-09-29 | 2021-01-22 | 青岛海尔空调器有限总公司 | Method and device for controlling refrigeration equipment and refrigeration equipment |
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| US4720982A (en) * | 1985-10-28 | 1988-01-26 | Kabushiki Kaisha Toshiba | Multi-type air conditioner with optimum control for each load |
| CN102353122A (en) * | 2011-09-26 | 2012-02-15 | Tcl空调器(中山)有限公司 | Modular multi-connection control method and system |
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| CN112254299A (en) * | 2020-09-29 | 2021-01-22 | 青岛海尔空调器有限总公司 | Method and device for controlling refrigeration equipment and refrigeration equipment |
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