CN104566773A - Volume control method and volume control system for multi-connected air conditioner - Google Patents
Volume control method and volume control system for multi-connected air conditioner Download PDFInfo
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- CN104566773A CN104566773A CN201310516032.2A CN201310516032A CN104566773A CN 104566773 A CN104566773 A CN 104566773A CN 201310516032 A CN201310516032 A CN 201310516032A CN 104566773 A CN104566773 A CN 104566773A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
Abstract
The invention provides a volume control method and a volume control system for a multi-connected air conditioner. The volume control method comprises the following steps of detecting whether a load demand exists in case of shutdown of a unit, and beginning to run a first compressor if the load demand exists; continuously detecting whether the load is increased and detecting to obtain a running target frequency value; if the load is increased and the running target frequency is larger than a preset second frequency value, starting a second compressor to run, wherein at this moment, the first compressor and the second compressor simultaneously run; in addition, under the current working condition, the numerical value of energy efficiency ratio when the first compressor and the second compressor simultaneously run is higher than the numerical value of energy efficiency ratio when only the first compressor runs. Therefore, an instruction of controlling the compressors to start and stop is obtained by the comparison of the frequency values and the judgment of the numerical values of energy efficiency ratios. According to the volume control method and the volume control system provided by the invention, the energy efficiency ratio of the multi-connected air conditioner can be further increased, and the compressors can be enabled to furthest run within a frequency interval with optical energy efficiency ratio, so that the multi-connected air conditioner meets the highest efficiency requirement and takes energy saving and emission reducing effects.
Description
Technical field
The present invention relates to the control technology field of combined air conditioners, particularly relate to a kind of capacity control method and control system of combined air conditioners, be particularly useful for a kind of combined air conditioners capacity control techniques of Multi-compressor parallel.
Background technology
Along with the popularization of converter technique, multi-variable air conditioning unit obtains swift and violent development.Compared with common air-conditioning, multi-variable air conditioning unit has refrigeration, heat powerful, energy-efficient, the comfortable advantage such as reliably rapidly, add that it combines layout, excellent part-load efficiency and using method flexibly freely, multi-variable air conditioning unit is commercially widely applied.
Compressor is the parts of most critical in multi-variable air conditioning unit.Characteristic according to compressor control effectively to compressor operating, has direct relation to energy saving of system.
For the combined air conditioners of Multi-compressor parallel, compressor bank connects with the form of parallel connection, and its capacity control method need meet following requirement: 1, when only having part indoor units to work, and the overall power consumption that can meet system reaches minimum; 2, the compressor bank be connected in parallel can be applicable in large capacity conditioner unit, its indoor set quantity connected is usually more, and the load of indoor set is not fixed, may be in constantly change always, therefore require compressor bank capacity can according to the change of load consecutive variations, such as can be adjustable in the scope of 10% ~ 130%; Therefore the volume controlled of compressor is mated with the load of system and is just seemed particularly important.3, the whole range of capacity of compressor should meet the maximum cold of system and requires (i.e. whole indoor units situation about operating at full capacity), meet most effective requirement again, just need between both to adopt efficient compressor capacity control technology to realize.
Therefore, need to improve the capacity control method of combined air conditioners and control system.
Summary of the invention
Technical problem to be solved by this invention is the capacity control method and the control system that provide a kind of combined air conditioners, can guarantee that compressor farthest runs on the frequency separation of best Energy Efficiency Ratio, makes combined air conditioners meet most effective requirement.
The present invention is achieved through the following technical solutions:
The capacity control method of combined air conditioners, comprise off-premises station and at least one the interconnective combined air conditioners of indoor set for controlling, described off-premises station includes the compressor of more than two, and the compressor of more than two adopts mode in parallel to connect; Wherein, the capacity control method of described combined air conditioners comprises the steps:
1) during compressor emergency shutdown, detect whether have workload demand, if there is workload demand, the first compressor starts is run;
2) whether detection load increases, and detection obtains operational objective frequency values; If load increases and operational objective frequency when being greater than default second frequency value, then the second compressor also startup optimization, now the first compressor and the second compressor run simultaneously; The Rule of judgment now controlling start/stop of compressor need meet simultaneously: at present under operating mode, the Energy Efficiency Ratio numerical value that combined air conditioners first compressor and the second compressor run simultaneously is higher than the Energy Efficiency Ratio numerical value only running the first compressor.
Wherein in an embodiment, the capacity control method of described combined air conditioners also comprises:
3) whether detection load reduces, and detection obtains operational objective frequency values; If load reduces and operational objective frequency values when being less than default first frequency value, then the first compressor operating, the second compressor shutdown.
Further, preset first frequency value and be less than default second frequency value.
Further, step 2) in, when the first compressor and the second compressor operating, during the 3rd compressor shutdown, whether increase, and detection obtains operational objective frequency values if continuing detection load; If load continues to increase and operational objective frequency is greater than default 4th frequency values, then the first compressor, the second compressor, the 3rd compressor all run; The Rule of judgment now controlling start/stop of compressor need meet simultaneously: at present under operating mode; the Energy Efficiency Ratio numerical value that combined air conditioners first compressor, the second compressor, the 3rd compressor all run higher than the first compressor, the second compressor operating, the Energy Efficiency Ratio numerical value of the 3rd compressor shutdown.
Further, step 2) in, whether detection load reduces, and detection obtains operational objective frequency values; If load reduces and target frequency when being less than default 3rd frequency values, then the first compressor, the second compressor operating, the 3rd compressor shutdown.
Further, preset the 3rd frequency values and be less than default 4th frequency values.
Further, preset second frequency value and be less than default 3rd frequency values.
The capacity control system of combined air conditioners, comprise off-premises station and at least one the interconnective combined air conditioners of indoor set for controlling, described off-premises station includes the compressor of more than two, and the compressor of more than two adopts mode in parallel to connect; Wherein, the capacity control system of described combined air conditioners includes:
Frequency detecting unit, for detecting the compressor actual motion frequency values obtaining combined air conditioners;
Cutting load testing unit, obtains combined air conditioners actual negative charge values for detecting;
Target frequency value arithmetic element, for obtaining the target frequency value of compressor operating;
Energy Efficiency Ratio numerical value detects and comparing unit, for by detection to combined air conditioners operational factor, and by comparing, the Energy Efficiency Ratio numerical value up till now under operating mode under different operational mode, and by comparing, obtain Energy Efficiency Ratio numerical value preferably volume controlled mode;
Predeterminated frequency value memory cell, for storing multiple predeterminated frequency value;
Frequency comparing unit, for comparing target frequency value and predeterminated frequency value;
Compressor control unit, for controlling start/stop of compressor action;
Described target frequency value arithmetic element detects according to frequency detecting unit and obtains the compressor actual motion frequency values of combined air conditioners and cutting load testing unit inspection obtains combined air conditioners actual negative charge values, and computing obtains the target frequency value of compressor operating; Target frequency value contrasts to the corresponding predeterminated frequency value stored in predeterminated frequency value memory cell by frequency comparing unit, obtains frequency values comparing result; Energy Efficiency Ratio numerical value detects and comparing unit obtains Energy Efficiency Ratio numerical value under operating mode up till now under different operational mode, and by comparing, obtains Energy Efficiency Ratio numerical value preferably volume controlled mode; According to frequency values comparing result and Energy Efficiency Ratio numerical value preferably volume controlled mode result, control each compressor start-stop.
Further, described predeterminated frequency value memory cell includes default first frequency unit and default second frequency unit; Described default first frequency unit is for storing default first frequency numerical value, and described default second frequency unit is for storing default second frequency numerical value.
Further, described predeterminated frequency value memory cell includes default 3rd frequency cells and presets the 4th frequency cells; Described the 3rd frequency cells of presetting is for storing default 3rd frequency values, and described the 4th frequency cells of presetting is for storing default 4th frequency values.
Beneficial effect of the present invention is as follows:
The capacity control method of combined air conditioners of the present invention and control system, when comprising the steps: compressor emergency shutdown, detect whether have workload demand, if there is workload demand, the first compressor starts is run; Continue detection load whether to increase, and detection obtains operational objective frequency values; If load increases and operational objective frequency when being greater than default second frequency value, then the second compressor also startup optimization, now the first compressor and the second compressor run simultaneously; And under current operating mode, the Energy Efficiency Ratio numerical value that combined air conditioners first compressor and the second compressor run is higher than the Energy Efficiency Ratio numerical value only running the first compressor simultaneously.Therefore, by the contrast of frequency values and the judgement of Energy Efficiency Ratio numerical value, the instruction controlling start/stop of compressor is obtained.The present invention farthest can improve the Energy Efficiency Ratio of combined air conditioners, can guarantee that compressor farthest runs on the frequency separation of best Energy Efficiency Ratio, makes combined air conditioners meet most effective requirement, plays the effect of energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is the relation curve schematic diagram of compressor frequency and Energy Efficiency Ratio;
Fig. 2 is the curve synoptic diagram of compressor frequency and Energy Efficiency Ratio relation after the capacity control method adopting combined air conditioners of the present invention;
Fig. 3 is the schematic flow sheet of the capacity control method of combined air conditioners of the present invention.
Detailed description of the invention
The present invention is in order to solve the problem of prior art, propose a kind of capacity control method of combined air conditioners, off-premises station and at least one the interconnective combined air conditioners of indoor set is comprised for controlling, described off-premises station includes the compressor of more than two, and the compressor of more than two adopts mode in parallel to connect; Wherein, the capacity control method of described combined air conditioners comprises the steps:
1) during compressor emergency shutdown, detect whether have workload demand, if there is workload demand, the first compressor starts is run;
2) whether detection load increases, and detection obtains operational objective frequency values; If load increases and operational objective frequency when being greater than default second frequency value, then the second compressor also startup optimization, now the first compressor and the second compressor run simultaneously; The Rule of judgment now controlling start/stop of compressor need meet simultaneously: at present under operating mode, the Energy Efficiency Ratio numerical value that combined air conditioners first compressor and the second compressor run simultaneously is higher than the Energy Efficiency Ratio numerical value only running the first compressor.
Wherein in an embodiment, the capacity control method of described combined air conditioners also comprises:
3) whether detection load reduces, and detection obtains operational objective frequency values; If load reduces and operational objective frequency values when being less than default first frequency value, then the first compressor operating, the second compressor shutdown.
Further, preset first frequency value and be less than default second frequency value.
Further, step 2) in, when the first compressor and the second compressor operating, during the 3rd compressor shutdown, whether increase, and detection obtains operational objective frequency values if continuing detection load; If load continues to increase and operational objective frequency is greater than default 4th frequency values, then the first compressor, the second compressor, the 3rd compressor all run; The Rule of judgment now controlling start/stop of compressor need meet simultaneously: at present under operating mode; the Energy Efficiency Ratio numerical value that combined air conditioners first compressor, the second compressor, the 3rd compressor all run higher than the first compressor, the second compressor operating, the Energy Efficiency Ratio numerical value of the 3rd compressor shutdown.
Further, step 2) in, whether detection load reduces, and detection obtains operational objective frequency values; If load reduces and target frequency when being less than default 3rd frequency values, then the first compressor, the second compressor operating, the 3rd compressor shutdown.
Further, preset the 3rd frequency values and be less than default 4th frequency values.
Further, preset second frequency value and be less than default 3rd frequency values.
The present invention is in order to solve the problem of prior art, also proposed a kind of capacity control system of combined air conditioners, off-premises station and at least one the interconnective combined air conditioners of indoor set is comprised for controlling, described off-premises station includes the compressor of more than two, and the compressor of more than two adopts mode in parallel to connect; Wherein, the capacity control system of described combined air conditioners includes:
Frequency detecting unit, for detecting the compressor actual motion frequency values obtaining combined air conditioners;
Cutting load testing unit, obtains combined air conditioners actual negative charge values for detecting;
Target frequency value arithmetic element, for obtaining the target frequency value of compressor operating;
Energy Efficiency Ratio numerical value detects and comparing unit, for by detection to combined air conditioners operational factor, and by comparing, the Energy Efficiency Ratio numerical value up till now under operating mode under different operational mode, and by comparing, obtain Energy Efficiency Ratio numerical value preferably volume controlled mode;
Predeterminated frequency value memory cell, for storing multiple predeterminated frequency value;
Frequency comparing unit, for comparing target frequency value and predeterminated frequency value;
Compressor control unit, for controlling start/stop of compressor action;
Described target frequency value arithmetic element detects according to frequency detecting unit and obtains the compressor actual motion frequency values of combined air conditioners and cutting load testing unit inspection obtains combined air conditioners actual negative charge values, and computing obtains the target frequency value of compressor operating; Target frequency value contrasts to the corresponding predeterminated frequency value stored in predeterminated frequency value memory cell by frequency comparing unit, obtains frequency values comparing result; Energy Efficiency Ratio numerical value detects and comparing unit obtains Energy Efficiency Ratio numerical value under operating mode up till now under different operational mode, and by comparing, obtains Energy Efficiency Ratio numerical value preferably volume controlled mode; According to frequency values comparing result and Energy Efficiency Ratio numerical value preferably volume controlled mode result, control each compressor start-stop.
Further, described predeterminated frequency value memory cell includes default first frequency unit and default second frequency unit; Described default first frequency unit is for storing default first frequency numerical value, and described default second frequency unit is for storing default second frequency numerical value.
Further, described predeterminated frequency value memory cell includes default 3rd frequency cells and presets the 4th frequency cells; Described the 3rd frequency cells of presetting is for storing default 3rd frequency values, and described the 4th frequency cells of presetting is for storing default 4th frequency values.
Embodiment:
Because compressor parallel unit is mainly used in large capacity conditioner unit, its indoor set quantity connected is usually more, and the load of indoor set is not fixed, in may constantly changing, therefore require that the capacity of compressor needs the consecutive variations according to the change of load always.
Every money compressor has the most high energy efficiency ratio traffic coverage of its correspondence, in Multi-compressor parallel unit, increases with load, and running frequency needed for compressor needs to increase, as shown in Figure 1.From compressor Energy Efficiency Ratio characteristic, with the increase of compressor frequency, its Energy Efficiency Ratio is the relation first increasing rear reduction, under shed parabolic relation.
The technical method that the present embodiment adopts is:
As shown in Figure 3, during compressor emergency shutdown, if there is workload demand, first compressor operating, if load increases and operational objective frequency when being greater than default second frequency value, then the second compressor also startup optimization, be now the first compressor and the second compressor operating, 3rd compressor shutdown, Energy Efficiency Ratio is higher than the first compressor operating, the Energy Efficiency Ratio of the second compressor and the 3rd compressor shutdown; If now load reduces and operational objective frequency when being less than default first frequency value, then the first compressor operating, second compressor and the 3rd compressor shutdown, preset first frequency value and be less than default second frequency value, so just can prevent the phenomenon causing the second high frequent start and stop because of load variations;
When the first compressor and the second compressor operating, during the 3rd compressor shutdown, if load continues to increase and operational objective frequency is greater than default 4th frequency values, then the first compressor, second compressor and the 3rd compressor all run, now the first compressor, the Energy Efficiency Ratio of the second compressor and the 3rd compressor operating is higher than the first compressor, second compressor operating, the Energy Efficiency Ratio of the 3rd compressor shutdown, if load reduces and target frequency when being less than default 3rd frequency values, then the first compressor, second compressor operating, 3rd compressor shutdown, preset the 3rd frequency values and be less than default 4th frequency values, the phenomenon causing the 3rd high frequent start and stop because of load variations can be prevented like this,
In order to ensure that the situation of frequent starting does not appear in compressor in load alternation process, also need guarantee first predeterminated frequency to be less than the second predeterminated frequency, the second predeterminated frequency is less than the 3rd predeterminated frequency, and the 3rd predeterminated frequency is less than the 4th predeterminated frequency.
In order to ensure the best Energy Efficiency Ratio of unit operation, arranging of predeterminated frequency is most important, must ensure when unit is when being less than the first predeterminated frequency and running, the Energy Efficiency Ratio that the Energy Efficiency Ratio that single compressor runs is run higher than double-compressor simultaneously, must ensure when unit is when being greater than the second predeterminated frequency and running, the Energy Efficiency Ratio that the Energy Efficiency Ratio that double-compressor runs simultaneously is run higher than single compressor, must ensure when unit is when being less than the 3rd predeterminated frequency and running, the Energy Efficiency Ratio that the Energy Efficiency Ratio that double-compressor runs simultaneously is run higher than three compressors simultaneously, must ensure when unit is when being greater than the 4th predeterminated frequency and running, the Energy Efficiency Ratio that the Energy Efficiency Ratio that three compressors run simultaneously is run higher than double-compressor simultaneously.
Fig. 2 is the graph of relation of compressor frequency and Energy Efficiency Ratio, after adopting technical scheme of the present invention, can ensure that unit operation is in the frequency separation of most high energy efficiency ratio.
The method is equally applicable in modularization unit.
In parallel for two certain frequency conversion two-spool compressors, the Energy Efficiency Ratio of compressor becomes under shed parabolic relation with compressor frequency, and the highest frequency separation of compressor Energy Efficiency Ratio is between 40-70Hz.For this reason, when indoor set load is lower, only need start 1 compressor, when the target frequency that indoor set burden requirement single compressor runs is higher than default second frequency value 70Hz, then can transfer the parallel running of unlatching two compressor to, the Energy Efficiency Ratio that the Energy Efficiency Ratio that now two compressor intermediate frequencies run can be run higher than single compressor high frequency.When indoor set load reduces, in order to prevent the frequent start-stop causing compressor because of the fluctuation of load, then need to be reduced to two and run when presetting first frequency value 25Hz, just a compressor is closed, only open a compressor operation.Concrete numerical value is herein all the citing in order to illustrate, different compressor frequencies is interval different.
The above embodiment only have expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the capacity control method of combined air conditioners, comprise off-premises station and at least one the interconnective combined air conditioners of indoor set for controlling, described off-premises station includes the compressor of more than two, and the compressor of more than two adopts mode in parallel to connect; It is characterized in that, the capacity control method of described combined air conditioners comprises the steps:
1) during compressor emergency shutdown, detect whether have workload demand, if there is workload demand, the first compressor starts is run;
2) whether detection load increases, and detection obtains operational objective frequency values; If load increases and operational objective frequency when being greater than default second frequency value, then the second compressor also startup optimization, now the first compressor and the second compressor run simultaneously; The Rule of judgment now controlling start/stop of compressor need meet simultaneously: at present under operating mode, the Energy Efficiency Ratio numerical value that combined air conditioners first compressor and the second compressor run simultaneously is higher than the Energy Efficiency Ratio numerical value only running the first compressor.
2. the capacity control method of combined air conditioners according to claim 1, is characterized in that, also comprises:
3) whether detection load reduces, and detection obtains operational objective frequency values; If load reduces and operational objective frequency values when being less than default first frequency value, then the first compressor operating, the second compressor shutdown.
3. the capacity control method of combined air conditioners according to claim 2, is characterized in that, described default first frequency value is less than default second frequency value.
4. according to claim 3, it is characterized in that, step 2) in, when the first compressor and the second compressor operating, during the 3rd compressor shutdown, whether increase, and detection obtains operational objective frequency values if continuing detection load; If load continues to increase and operational objective frequency is greater than default 4th frequency values, then the first compressor, the second compressor, the 3rd compressor all run; The Rule of judgment now controlling start/stop of compressor need meet simultaneously: at present under operating mode, and the Energy Efficiency Ratio numerical value that combined air conditioners first compressor, the second compressor and the 3rd compressor all run is higher than the Energy Efficiency Ratio numerical value of the first compressor, the second compressor operating and the 3rd compressor shutdown.
5. the capacity control method of combined air conditioners according to claim 4, is characterized in that, step 2) in, whether detection load reduces, and detection obtains operational objective frequency values; If load reduces and target frequency when being less than default 3rd frequency values, then the first compressor, the second compressor operating, the 3rd compressor shutdown.
6. the capacity control method of combined air conditioners according to claim 5, is characterized in that, described the 3rd frequency values of presetting is less than default 4th frequency values.
7. the capacity control method of combined air conditioners according to claim 6, is characterized in that, described default second frequency value is less than default 3rd frequency values.
8. use the capacity control system as the combined air conditioners of the capacity control method of the combined air conditioners in claim 1 to 7 as described in any one, off-premises station and at least one the interconnective combined air conditioners of indoor set is comprised for controlling, described off-premises station includes the compressor of more than two, and the compressor of more than two adopts mode in parallel to connect; It is characterized in that, the capacity control system of described combined air conditioners includes:
Frequency detecting unit, for detecting the compressor actual motion frequency values obtaining combined air conditioners;
Cutting load testing unit, obtains combined air conditioners actual negative charge values for detecting;
Target frequency value arithmetic element, for obtaining the target frequency value of compressor operating;
Energy Efficiency Ratio numerical value detects and comparing unit, for by detection to combined air conditioners operational factor, and by comparing, the Energy Efficiency Ratio numerical value up till now under operating mode under different operational mode, and by comparing, obtain Energy Efficiency Ratio numerical value preferably volume controlled mode;
Predeterminated frequency value memory cell, for storing multiple predeterminated frequency value;
Frequency comparing unit, for comparing target frequency value and predeterminated frequency value;
Compressor control unit, for controlling start/stop of compressor action;
Described target frequency value arithmetic element detects according to frequency detecting unit and obtains the compressor actual motion frequency values of combined air conditioners and cutting load testing unit inspection obtains combined air conditioners actual negative charge values, and computing obtains the target frequency value of compressor operating; Target frequency value contrasts to the corresponding predeterminated frequency value stored in predeterminated frequency value memory cell by frequency comparing unit, obtains frequency values comparing result; Energy Efficiency Ratio numerical value detects and comparing unit obtains Energy Efficiency Ratio numerical value under operating mode up till now under different operational mode, and by comparing, obtains Energy Efficiency Ratio numerical value preferably volume controlled mode; According to frequency values comparing result and Energy Efficiency Ratio numerical value preferably volume controlled mode result, control each compressor start-stop.
9. the capacity control system of combined air conditioners according to claim 8, is characterized in that, described predeterminated frequency value memory cell includes default first frequency unit and default second frequency unit; Described default first frequency unit is for storing default first frequency numerical value, and described default second frequency unit is for storing default second frequency numerical value.
10. the capacity control system of combined air conditioners according to claim 9, is characterized in that, described predeterminated frequency value memory cell includes default 3rd frequency cells and presets the 4th frequency cells; Described the 3rd frequency cells of presetting is for storing default 3rd frequency values, and described the 4th frequency cells of presetting is for storing default 4th frequency values.
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