CN106524582A - Compressor load control method and device applicable to water side parallel-connected air cooled heat pump units - Google Patents
Compressor load control method and device applicable to water side parallel-connected air cooled heat pump units Download PDFInfo
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- 238000005057 refrigeration Methods 0.000 claims description 44
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Classifications
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
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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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Abstract
The embodiment of the invention relates to a compressor load control method and a compressor load control device applicable to water side parallel-connected air cooled heat pump units. The method comprises the following steps: calculating initial number of air cooled heat pump units, corresponding to a refrigerating mode, of a compressor by combining a first algorithm according to the difference between an outlet water temperature and a set temperature of a water side system; calculating a correction quantity of the initial number of the air cooled heat pump units, corresponding to the refrigerating mode, of the compressor by combining a second algorithm according to the outlet water temperature and a change rate thereof of the water side system and the set temperature; calculating to obtain final numbers of the air cooled heat pump units corresponding to the refrigerating mode and a heating mode of the compressor according to the initial number and the correction quantity. According to the compressor load control method and the compressor load control device applicable to the water side parallel-connected air cooled heat pump units, the load of the compressor can be kept in a reasonable state; the situations that the compressor is shut down caused by the fact that the outlet water temperature of the water side system is overshot seriously and the user experiment is low caused by low work efficiency of the compressor because the outlet water temperature is adjusted slowly are prevented.
Description
Technical Field
The embodiment of the invention relates to the technical field of air conditioner control, in particular to a compressor load control method and device suitable for a water side parallel air-cooled heat pump unit.
Background
The air-cooled heat pump unit is widely applied due to the combination of cold and heat sources and high utilization rate of primary energy. In practical application, the independent air-cooled heat pump units are combined together to form the modular air-cooled heat pump unit, so that a user can change the number of the air-cooled heat pump units according to the actual load condition and increase the units in the subsequent use process, and each unit is provided with a water inlet pipe and a water outlet pipe with the same caliber, so that the air-cooled heat pump unit is convenient to install.
In the air-cooled heat pump units with water side systems connected in parallel, the capacity of the water side system often leads to the stability of the operation of each air-cooled heat pump unit. Therefore, the loading and unloading of the air cooling and heating pump unit in the prior art are determined according to the range of the difference value between the outlet water temperature and the set temperature. However, different users use the air-cooled heat pump units with great difference, which causes the water side system to be easy to have serious water temperature superelevation to cause unit shutdown, or causes poor user experience due to too slow water temperature adjustment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a compressor load control method and device suitable for a water side parallel air-cooled heat pump unit, which are used for solving the problem of poor user experience caused by shutdown or too slow water temperature adjustment due to serious water temperature overshoot during the process of loading and unloading the air-cooled heat pump unit in the prior art.
In a first aspect, the present invention provides a compressor load control method for a water-side parallel air-cooled heat pump unit, the method includes:
calculating the initial number of the air-cooled heat pump units of the compressor corresponding to the refrigeration mode according to the difference between the outlet water temperature of the water side system and the set temperature;
calculating the correction quantity of the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the outlet water temperature and the change rate of the outlet water temperature of the water side system and the set temperature;
and calculating the final number of the air-cooled heat pump units of which the compressors correspond to the refrigeration mode and the heating mode according to the initial number and the correction quantity.
Optionally, the calculating, according to the outlet water temperature of the water side system, the change rate of the outlet water temperature and the set temperature, the correction amount of the initial number of the air-cooled heat pump units in the refrigeration mode corresponding to the compressor includes:
acquiring a first acquisition value and a second acquisition value of the outlet water temperature of a water side system and calculating the change rate of the outlet water temperature of the water side system; the first acquisition value is obtained before the second acquisition value;
acquiring a second proportionality coefficient value corresponding to the difference between the second acquisition value and the set temperature;
and calculating the product of the change rate of the outlet water temperature of the water side system and the second proportionality coefficient value to obtain the correction quantity of the initial number of the air cooling and heating pump units under the refrigeration mode and the heating mode corresponding to the compressor.
Optionally, the step of obtaining a second proportionality coefficient value corresponding to the difference between the second collection value and the set temperature includes:
when the difference between the second collection value and the set temperature is smaller than a first preset value, generating a compressor stop control instruction;
when the difference between the second acquisition value and the set temperature is greater than or equal to the first preset value and smaller than a second preset value, enabling the second proportionality coefficient value to take the first coefficient value;
when the difference between the second collection value and the set temperature is greater than or equal to the second preset value and smaller than a third preset value, the second proportionality coefficient value is made to be a second coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a third preset value and smaller than a fourth preset value, enabling the second coefficient of proportionality value to take a third coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a fourth preset value and smaller than a fifth preset value, enabling the second proportionality coefficient value to take a fourth coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a fifth preset value and less than a sixth preset value, enabling the second proportionality coefficient value to take a fifth coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to the sixth preset value, the second proportionality coefficient value is made to take a sixth coefficient value;
or,
the second collection value is in linear proportional relation with the difference of the set temperature and a second proportionality coefficient value.
Optionally, the calculating the initial number of the air-cooled heat pump units of the refrigeration mode corresponding to the compressor according to the difference between the outlet water temperature of the water side system and the set temperature includes:
obtaining a first scale factor value according to the difference between the water outlet temperature of the water side system and the set temperature;
and calculating the product of the difference between the outlet water temperature of the water side system and the set temperature and the first proportional coefficient value to obtain the initial number of the air cooling and heating pump units corresponding to the compressor in the refrigeration mode and the heating mode.
Optionally, the step of obtaining the first scale factor according to the difference between the outlet water temperature of the water side system and the set temperature includes:
the difference between the water outlet temperature of the water side system and the set temperature is in linear proportional relation with the first proportional coefficient value.
In a second aspect, an embodiment of the present invention provides a compressor load control device for a water-side parallel air-cooled heat pump unit, where the device includes:
the unit initial number calculating module is used for calculating the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the difference between the water outlet temperature of the water side system and the set temperature;
the unit correction amount calculation module is used for calculating the correction amount of the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the outlet water temperature and the change rate of the outlet water temperature of the water side system and the set temperature;
and the final number calculating module of the units is used for calculating the final number of the air-cooled heat pump units of the refrigeration mode and the heating mode corresponding to the compressors according to the initial number and the correction quantity.
Optionally, the unit correction amount calculation module includes:
the water outlet temperature change rate calculation unit of the water side system is used for acquiring a first acquisition value and a second acquisition value of the water outlet temperature of the water side system and calculating the change rate of the water outlet temperature of the water side system; the first acquisition value is obtained before the second acquisition value;
a second proportionality coefficient value obtaining unit, configured to obtain a second proportionality coefficient value corresponding to a difference between the second acquisition value and the set temperature;
and the unit number correction quantity calculating unit is used for calculating the product of the change rate of the outlet water temperature of the water side system and the second proportional coefficient value to obtain the correction quantity of the initial number of the air cooling and heating pump units under the refrigeration mode and the heating mode corresponding to the compressor.
Optionally, the second coefficient of proportionality value obtaining unit includes:
the shutdown control instruction generating subunit is used for generating a compressor shutdown control instruction when the difference between the second acquisition value and the set temperature is smaller than a first preset value;
a first coefficient value obtaining subunit, configured to make the second proportionality coefficient value take the first coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the first preset value and smaller than a second preset value;
a second coefficient value obtaining subunit, configured to make the second scaling coefficient value take the second coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the second preset value and smaller than a third preset value;
a third coefficient value obtaining subunit, configured to make the second coefficient value take a third coefficient value when a difference between the second collected value and the set temperature is greater than or equal to a third preset value and smaller than a fourth preset value;
a fourth coefficient value obtaining subunit, configured to make the second scaling coefficient value take the fourth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the fourth preset value and smaller than a fifth preset value;
a fifth coefficient value obtaining subunit, configured to make the second coefficient value take the fifth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the fifth preset value and smaller than a sixth preset value;
a sixth coefficient value obtaining subunit, configured to make the second scaling coefficient value take the sixth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the sixth preset value;
or,
the second proportion coefficient value obtaining unit is used for obtaining a second proportion coefficient value according to the difference between the second collection value and the set temperature and the linear proportion relation of the second proportion coefficient value.
Optionally, the initial number of units calculating module includes:
a first scale factor value obtaining unit, configured to obtain a first scale factor value according to a difference between a water outlet temperature of the water side system and a set temperature;
and the unit initial number calculating unit is used for calculating the product of the difference between the outlet water temperature of the water side system and the set temperature and the first proportional coefficient value to obtain the initial number of the air-cooled heat pump units under the refrigeration mode and the heating mode corresponding to the compressor.
Optionally, the first ratio coefficient value obtaining unit is configured to calculate the first ratio coefficient value according to a linear proportional relationship between a difference between a water outlet temperature of the water side system and a set temperature and the first ratio coefficient value.
According to the technical scheme, the initial number of the air-cooled heat pump units corresponding to the compressors in the refrigerating mode and the heating mode is obtained by calculating according to the difference value between the outlet water temperature of the water side system and the set temperature; then calculating the correction quantity of the initial number of the air-cooled heat pump units corresponding to the compressors according to the outlet water temperature of the water side system, the change rate of the outlet water temperature and the set temperature; and finally, calculating the final number of the air-cooled heat pump units corresponding to the compressors in the refrigeration mode and the heating mode according to the initial number and the correction quantity. Compared with the prior art, the initial number of the air-cooled heat pump units corresponding to the compressors is corrected through the change rate of the outlet water temperature of the water side system, so that the problem that the compressors are shut down due to serious overshooting of the outlet water temperature of the water side system or the user experience is low due to low working efficiency of the compressors due to too slow adjustment of the outlet water temperature can be prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for controlling the load of a compressor of a water-side parallel air-cooled heat pump unit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the difference between the outlet water temperature and the set temperature of the water side system and the first proportionality coefficient value in a linear proportion;
FIG. 3 is a schematic flow chart of another method for controlling the load of a compressor of a water-side parallel air-cooled heat pump unit according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the relationship between the difference between the outlet water temperature and the set temperature of the water side system and the second proportionality coefficient value;
FIG. 5 is a block diagram of a compressor load control apparatus for a water-side parallel air-cooled heat pump unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic flow chart of a compressor load control method suitable for a water-side parallel air-cooled heat pump unit according to an embodiment of the present invention. Referring to fig. 1, the method includes:
s1, calculating the initial number of the air-cooled heat pump units of the refrigeration mode corresponding to the compressor according to the difference between the outlet water temperature of the water side system and the set temperature;
s2, calculating the correction quantity of the initial number of the air-cooled heat pump units of the refrigeration mode corresponding to the compressor according to the outlet water temperature and the change rate of the outlet water temperature of the water side system and the set temperature;
and S3, calculating the final number of the air-cooled heat pump units corresponding to the refrigeration mode and the heating mode of the compressor according to the initial number and the correction quantity.
It should be noted that, in the embodiment of the present invention, the water outlet temperature of the water side system refers to the water temperature at the water outlet of the main pipe after the water side systems of the multiple air-cooled heat pump units are connected in parallel. The water outlets of the water side systems of the air-cooled heat pump units are communicated with the main pipeline, and the water outlet temperature of the water outlets of the main pipeline can reflect the load condition of the compressor and the load condition of the indoor unit under the current condition because the water outlet temperatures of the units are different.
The set temperature refers to an expected usage temperature value set by a user. For example, the user sets the indoor temperature to 26 degrees celsius. The preset temperature may be adjusted according to a cooling mode or a heating mode, which is not limited in the present invention.
According to the embodiment of the invention, the initial number of the air-cooled heat pump units corresponding to the compressors in the refrigeration mode and the heating mode is calculated according to the difference value between the outlet water temperature of the water side system and the set temperature and by combining a first algorithm; then, according to the water outlet temperature of the water side system, the change rate and the set temperature of the water side system and a second algorithm, calculating the correction quantity of the initial number of the air-cooled heat pump units corresponding to the compressors; and finally, calculating the final number of the air-cooled heat pump units corresponding to the compressors in the refrigeration mode and the heating mode according to the initial number and the correction quantity. Compared with the prior art, the initial number of the air-cooled heat pump units corresponding to the compressors is corrected through the change rate of the outlet water temperature of the water side system, so that the problem that the compressors are shut down due to serious overshooting of the outlet water temperature of the water side system or the user experience is low due to low working efficiency of the compressors due to too slow adjustment of the outlet water temperature can be prevented.
The following describes in detail the steps of the method for controlling the load of the compressor of the parallel water-side air-cooled heat pump unit according to the embodiment of the present invention with reference to the embodiment and the drawings, with the processor as the main execution unit.
First, step S1 is described, in which the initial number of air-cooled heat pump units corresponding to the compressors in the refrigeration mode is calculated based on the difference between the outlet water temperature of the water side system and the set temperature.
In the embodiment of the invention, the processor firstly obtains the outlet water temperature T of the water side systemwAnd the set temperature T of the indoor unitws. Wherein, the outlet water temperature can be collected by the temperature sensor and then transmitted to the processor. The set temperature can be obtained by directly reading the data in the indoor unit. The processor then calculates the water temperature TwAnd a set temperature TwsDifference (T) ofw-Tws)。
In order to obtain the initial number of stations, the embodiment of the present invention provides a first algorithm. In the first algorithm provided by the embodiment of the invention, the difference between the outlet water temperature and the set temperature of the water side system is in linear proportional relation with the first proportional coefficient value. When difference value (T)w-Tws) Andwhen the first scale factor value is in a direct proportional relationship, T is shown in FIG. 2w-Tws1.5, the first scale coefficient value may take a value of 1. Of course, those skilled in the art can set the above difference value and the first ratio coefficient value according to specific situations, or set a functional relationship among the water outlet temperature, the set temperature and the first ratio coefficient value of the water side system, and the invention is not limited thereto.
The processor obtains the outlet water temperature TwAnd a set temperature TwsDifference (T) ofw-Tws) On the basis, the initial number F of the air-cooled heat pump units under the refrigeration mode corresponding to the compressor can be obtained by combining the first algorithm. For example:
F1＝k1*(Tw-Tws)。
the processor acquires the number (F) of the current online air-cooled heat pump units1+F2) In the case of (1), the number of the air-cooled heat pump units corresponding to the compressors in the cooling mode is F1The initial number F of the air-cooled heat pump units corresponding to the compressor in the heating mode can be obtained2。
Next, step S2 is introduced, in which the correction amount of the initial number of air-cooled heat pump units in the refrigeration mode corresponding to the compressor is calculated based on the outlet water temperature of the water side system, the change rate thereof, and the set temperature.
In an embodiment of the present invention, the processor obtains the first collection value and the second collection value of the outlet water temperature of the water side system and calculates the change rate of the outlet water temperature of the water side system, that is, the processor executes step S21. As shown in fig. 3, after acquiring the outlet water temperature of the water side system in step S1, the processor acquires the two outlet water temperatures, namely a first acquisition value Tw (T) and a second acquisition value Tw (T + nT) (the first acquisition value is acquired before the second acquisition value, that is, the first acquisition value of the outlet water temperature is acquired first, and then the second acquisition value of the outlet water temperature is acquired), then acquires the period T of the acquired outlet water temperature, and calculates the change rate Δ T of the outlet water temperature, that is:
in the formula, T represents a water temperature acquisition period.
Then the processor obtains a second ratio coefficient value corresponding to the difference between the second collection value and the set temperature, and then the processor executes step S22. In the embodiment of the present invention, the step of acquiring the second proportionality coefficient value in step S22 includes:
when the difference between the second collection value and the set temperature is smaller than a first preset value, generating a compressor stop control instruction;
when the difference between the second acquisition value and the set temperature is greater than or equal to the first preset value and smaller than a second preset value, enabling the second proportionality coefficient value to take the first coefficient value;
when the difference between the second collection value and the set temperature is greater than or equal to the second preset value and smaller than a third preset value, the second proportionality coefficient value is made to be a second coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a third preset value and smaller than a fourth preset value, enabling the second coefficient of proportionality value to take a third coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a fourth preset value and smaller than a fifth preset value, enabling the second proportionality coefficient value to take a fourth coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a fifth preset value and less than a sixth preset value, enabling the second proportionality coefficient value to take a fifth coefficient value;
and when the difference between the second acquisition value and the set temperature is greater than or equal to the sixth preset value, making the second proportionality coefficient value take a sixth coefficient value.
As shown in FIG. 4, assuming that the first, second, third, fourth, fifth and sixth preset values are-2, -1.5, -0.5, 1.5 and 2 degrees Celsius, respectively, the first, second, third, fourth, fifth and sixth coefficient values are-2, -1, 0, 1 and 2, respectively. When the difference T between the second collected value and the set temperaturew(t+nT)-TwsWhen < -2 >, the processor generates a compressor stop control instruction; when-1.5 is less than or equal to Tw(t+nT)-TwsWhen the value is less than-0.5, the processor acquires that the second proportionality coefficient value is-2; when-0.5 is less than or equal to Tw(t+nT)-TwsWhen the ratio is less than 0.5, the processor acquires a third ratio coefficient value as-1; when T is more than or equal to 0.5w(t+nT)-TwsIf the value is less than 1.5, the processor acquires that the fourth proportionality coefficient value is 0; when T is more than or equal to 1.5w(t+nT)-TwsIf the ratio is less than 2, the processor acquires that the fifth proportionality coefficient value is 1; when 2 is less than or equal to Tw(t+nT)-TwsThen the processor obtains the sixth scaling factor value as 2.
Then, the processor obtains the change rate Delta T of the outlet water temperature according to the step S21 and the second proportionality coefficient value k according to the step S222Calculating the product of the two to obtain the correction quantity delta F of the initial number of the air-cooled heat pump units corresponding to the compressors in the refrigeration mode, namely:
ΔF＝k2*ΔT；
in practice, the correction amount Δ F is an integer, and therefore, the integer value of the correction amount may be rounded or rounded down, and the present invention is not limited thereto.
Finally, step S3 is introduced to calculate the final number of the air-cooled heat pump units corresponding to the refrigeration mode and the heating mode of the compressor according to the initial number and the correction amount.
In the embodiment of the invention, the processor is used for processing the heat pump units according to the initial number F of the air-cooled heat pump units under the refrigeration modes corresponding to the compressors1Calculating the final number F of air cooling and heating pump units under the refrigeration mode corresponding to the compressor according to the correction quantity delta F1', i.e.:
F1’＝ΔF+F1。
similarly, when the number of the on-line air-cooled heat pump units is fixed, the number of the compressors corresponding to the final number F of the air-cooled heat pump units in the heating mode2’＝ΔF+F2。
According to the embodiment of the invention, the change rate of the outlet temperature is calculated according to the outlet temperature, a second proportion coefficient value is obtained according to the outlet temperature and the set temperature, and then the correction quantity of the number of the air-cooled heat pump units is calculated according to the change rate and the second proportion coefficient value; and then adjusting the initial number of the air-cooled heat pump units under the refrigeration mode corresponding to the compressors according to the correction quantity, thereby obtaining the final number of the air-cooled heat pump units. Therefore, the number of the air cooling and heating pump units in the refrigeration mode corresponding to the compressor is adjusted, so that the loading or unloading of the compressor is related to the outlet water temperature and the set temperature, the condition that the outlet water temperature is excessively adjusted or is excessively slowly adjusted can be avoided, the compressor is matched with the set temperature, and the use experience of a user is improved.
In order to embody the superiority of the method for controlling the load of the compressor suitable for the water-side parallel air-cooled heat pump unit provided by the embodiment of the present invention, an embodiment of the present invention further provides a device for controlling the load of the compressor suitable for the water-side parallel air-cooled heat pump unit, as shown in fig. 5, the device includes:
the unit initial number calculating module M1 is used for calculating the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the difference between the water outlet temperature of the water side system and the set temperature;
the unit correction amount calculation module M2 is used for calculating the correction amount of the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the outlet water temperature and the change rate of the outlet water temperature of the water side system and the set temperature;
and the final unit number calculating module M3 is used for calculating the final number of the air-cooled heat pump units of the refrigeration mode and the heating mode corresponding to the compressors according to the initial number and the correction quantity.
Optionally, the unit correction amount calculation module M2 includes:
the water outlet temperature change rate calculation unit M21 of the water side system is used for acquiring a first acquisition value and a second acquisition value of the water outlet temperature of the water side system and calculating the change rate of the water outlet temperature of the water side system; the first acquisition value is obtained before the second acquisition value;
a second proportionality coefficient value obtaining unit M22, configured to obtain a second proportionality coefficient value corresponding to a difference between the second collected value and the set temperature;
and the unit number correction quantity calculating unit M23 is used for calculating the product of the change rate of the outlet water temperature of the water side system and the second proportional coefficient value to obtain the correction quantity of the initial unit number of the air cooling and heating pump units under the refrigeration mode and the heating mode corresponding to the compressor.
Optionally, the second proportionality coefficient value obtaining unit M22 includes:
the shutdown control instruction generating subunit is used for generating a compressor shutdown control instruction when the difference between the second acquisition value and the set temperature is smaller than a first preset value;
a first coefficient value obtaining subunit, configured to make the second proportionality coefficient value take the first coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the first preset value and smaller than a second preset value;
a second coefficient value obtaining subunit, configured to make the second scaling coefficient value take the second coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the second preset value and smaller than a third preset value;
a third coefficient value obtaining subunit, configured to make the second coefficient value take a third coefficient value when a difference between the second collected value and the set temperature is greater than or equal to a third preset value and smaller than a fourth preset value;
a fourth coefficient value obtaining subunit, configured to make the second scaling coefficient value take the fourth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the fourth preset value and smaller than a fifth preset value;
a fifth coefficient value obtaining subunit, configured to make the second coefficient value take the fifth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the fifth preset value and smaller than a sixth preset value;
a sixth coefficient value obtaining subunit, configured to make the second scaling coefficient value take the sixth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the sixth preset value;
or,
the second proportionality coefficient value obtaining unit M22 is configured to obtain a second proportionality coefficient value according to a linear proportionality relationship between a difference between the second collected value and the set temperature and the second proportionality coefficient value.
Optionally, the unit initial number calculating module M1 includes:
a first scale factor value obtaining unit M11, configured to obtain a first scale factor value according to a difference between the outlet water temperature of the water side system and a set temperature;
and the unit initial number calculating unit M12 is used for calculating the product of the difference between the outlet water temperature of the water side system and the set temperature and the first proportional coefficient value to obtain the initial number of the air cooling and heating pump units corresponding to the compressor in the cooling mode and the heating mode.
Optionally, the first ratio coefficient value obtaining unit is configured to calculate the first ratio coefficient value according to a linear proportional relationship between a difference between a water outlet temperature of the water side system and a set temperature and the first ratio coefficient value.
It should be noted that the compressor load control device for a water-side parallel air-cooled heat pump unit according to the embodiment of the present invention is implemented based on the above compressor load control method for a water-side parallel air-cooled heat pump unit, including all technical features of the embodiment of the method, so that the same technical problems can be solved, and the same technical effects can be achieved.
In summary, according to the compressor load control method and device for the water-side parallel air-cooled heat pump units provided by the embodiments of the present invention, the initial number of the air-cooled heat pump units corresponding to the compressors in the cooling mode and the heating mode is obtained by calculating according to the difference between the outlet water temperature of the water-side system and the set temperature in combination with the first algorithm; then, according to the water outlet temperature of the water side system, the change rate and the set temperature of the water side system and a second algorithm, calculating the correction quantity of the initial number of the air-cooled heat pump units corresponding to the compressors; and finally, calculating the final number of the air-cooled heat pump units corresponding to the compressors in the refrigeration mode and the heating mode according to the initial number and the correction quantity. Compared with the prior art, the initial number of the air-cooled heat pump units corresponding to the compressors is corrected through the change rate of the outlet water temperature of the water side system, so that the condition that the compressor is shut down due to serious overshoot of the outlet water temperature of the water side system or the user experiences low due to low working efficiency of the compressor due to too slow adjustment of the outlet water temperature can be prevented, and the user experience is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A compressor load control method suitable for a water side parallel air-cooled heat pump unit is characterized by comprising the following steps:
calculating the initial number of the air-cooled heat pump units of the compressor corresponding to the refrigeration mode according to the difference between the outlet water temperature of the water side system and the set temperature;
calculating the correction quantity of the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the outlet water temperature and the change rate of the outlet water temperature of the water side system and the set temperature;
and calculating the final number of the air-cooled heat pump units of which the compressors correspond to the refrigeration mode and the heating mode according to the initial number and the correction quantity.
2. The compressor load control method according to claim 1, wherein the calculating the correction amount of the initial number of the air-cooled heat pump units of the refrigeration mode corresponding to the compressor based on the leaving water temperature of the water side system and the change rate thereof and the set temperature comprises:
acquiring a first acquisition value and a second acquisition value of the outlet water temperature of a water side system and calculating the change rate of the outlet water temperature of the water side system; the first acquisition value is obtained before the second acquisition value;
acquiring a second proportionality coefficient value corresponding to the difference between the second acquisition value and the set temperature;
and calculating the product of the change rate of the outlet water temperature of the water side system and the second proportionality coefficient value to obtain the correction quantity of the initial number of the air cooling and heating pump units under the refrigeration mode and the heating mode corresponding to the compressor.
3. The compressor load control method according to claim 2, wherein the step of obtaining a second proportionality coefficient value corresponding to the difference between the second collected value and the set temperature includes:
when the difference between the second collection value and the set temperature is smaller than a first preset value, generating a compressor stop control instruction;
when the difference between the second acquisition value and the set temperature is greater than or equal to the first preset value and smaller than a second preset value, enabling the second proportionality coefficient value to take the first coefficient value;
when the difference between the second collection value and the set temperature is greater than or equal to the second preset value and smaller than a third preset value, the second proportionality coefficient value is made to be a second coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a third preset value and smaller than a fourth preset value, enabling the second coefficient of proportionality value to take a third coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a fourth preset value and smaller than a fifth preset value, enabling the second proportionality coefficient value to take a fourth coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to a fifth preset value and less than a sixth preset value, enabling the second proportionality coefficient value to take a fifth coefficient value;
when the difference between the second acquisition value and the set temperature is greater than or equal to the sixth preset value, the second proportionality coefficient value is made to take a sixth coefficient value;
or,
the second collection value is in linear proportional relation with the difference of the set temperature and a second proportionality coefficient value.
4. The compressor load control method according to claim 1, wherein the calculating the initial number of the air-cooled heat pump units of the refrigeration mode corresponding to the compressor according to the difference between the outlet water temperature of the water side system and the set temperature comprises:
obtaining a first scale factor value according to the difference between the water outlet temperature of the water side system and the set temperature;
and calculating the product of the difference between the outlet water temperature of the water side system and the set temperature and the first proportional coefficient value to obtain the initial number of the air cooling and heating pump units corresponding to the compressor in the refrigeration mode and the heating mode.
5. The compressor load control method according to claim 4, wherein the step of obtaining the first scaling factor value according to the difference between the outlet water temperature of the water side system and the set temperature comprises:
the difference between the water outlet temperature of the water side system and the set temperature is in linear proportional relation with the first proportional coefficient value.
6. A compressor load control device suitable for a water side parallel air-cooled heat pump unit is characterized by comprising:
the unit initial number calculating module is used for calculating the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the difference between the water outlet temperature of the water side system and the set temperature;
the unit correction amount calculation module is used for calculating the correction amount of the initial number of the air-cooled heat pump units of the refrigeration modes corresponding to the compressors according to the outlet water temperature and the change rate of the outlet water temperature of the water side system and the set temperature;
and the final number calculating module of the units is used for calculating the final number of the air-cooled heat pump units of the refrigeration mode and the heating mode corresponding to the compressors according to the initial number and the correction quantity.
7. The compressor load control device according to claim 6, wherein the unit correction amount calculation module includes:
the water outlet temperature change rate calculation unit of the water side system is used for acquiring a first acquisition value and a second acquisition value of the water outlet temperature of the water side system and calculating the change rate of the water outlet temperature of the water side system; the first acquisition value is obtained before the second acquisition value;
a second proportionality coefficient value obtaining unit, configured to obtain a second proportionality coefficient value corresponding to a difference between the second acquisition value and the set temperature;
and the unit number correction quantity calculating unit is used for calculating the product of the change rate of the outlet water temperature of the water side system and the second proportional coefficient value to obtain the correction quantity of the initial number of the air cooling and heating pump units under the refrigeration mode and the heating mode corresponding to the compressor.
8. The compressor load control device according to claim 7, wherein the second proportionality coefficient value acquisition unit includes:
the shutdown control instruction generating subunit is used for generating a compressor shutdown control instruction when the difference between the second acquisition value and the set temperature is smaller than a first preset value;
a first coefficient value obtaining subunit, configured to make the second proportionality coefficient value take the first coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the first preset value and smaller than a second preset value;
a second coefficient value obtaining subunit, configured to make the second scaling coefficient value take the second coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the second preset value and smaller than a third preset value;
a third coefficient value obtaining subunit, configured to make the second coefficient value take a third coefficient value when a difference between the second collected value and the set temperature is greater than or equal to a third preset value and smaller than a fourth preset value;
a fourth coefficient value obtaining subunit, configured to make the second scaling coefficient value take the fourth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the fourth preset value and smaller than a fifth preset value;
a fifth coefficient value obtaining subunit, configured to make the second coefficient value take the fifth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the fifth preset value and smaller than a sixth preset value;
a sixth coefficient value obtaining subunit, configured to make the second scaling coefficient value take the sixth coefficient value when a difference between the second collected value and the set temperature is greater than or equal to the sixth preset value;
or,
the second proportion coefficient value obtaining unit is used for obtaining a second proportion coefficient value according to the difference between the second collection value and the set temperature and the linear proportion relation of the second proportion coefficient value.
9. The compressor load control device according to claim 6, wherein the unit initial number calculating module includes:
a first scale factor value obtaining unit, configured to obtain a first scale factor value according to a difference between a water outlet temperature of the water side system and a set temperature;
and the unit initial number calculating unit is used for calculating the product of the difference between the outlet water temperature of the water side system and the set temperature and the first proportional coefficient value to obtain the initial number of the air-cooled heat pump units under the refrigeration mode and the heating mode corresponding to the compressor.
10. The compressor load control device according to claim 9, wherein the first proportionality coefficient value acquisition unit is configured to calculate the first proportionality coefficient value according to a difference between a leaving water temperature of the water side system and a set temperature and a linear proportionality relationship of the first proportionality coefficient value.
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