CN112665245A - Load regulation control method and device of water chilling unit and water chilling unit - Google Patents
Load regulation control method and device of water chilling unit and water chilling unit Download PDFInfo
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- CN112665245A CN112665245A CN202011490066.5A CN202011490066A CN112665245A CN 112665245 A CN112665245 A CN 112665245A CN 202011490066 A CN202011490066 A CN 202011490066A CN 112665245 A CN112665245 A CN 112665245A
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Abstract
The application relates to a load regulation control method and device of a water chilling unit and the water chilling unit, and belongs to the technical field of water chilling unit control. The application includes: calculating the actual refrigerating capacity of a compressor of the water chilling unit and the temperature difference of an evaporator end of an evaporator of the water chilling unit; determining a first adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity, and determining a second adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the temperature difference of the evaporator end; and adjusting the opening degree of the electronic expansion valve of the water chilling unit according to the first adjustment component and the second adjustment component. Through this application, help reducing the volatility of refrigerated water temperature variation.
Description
Technical Field
The application belongs to the technical field of water chilling unit control, and particularly relates to a load regulation control method and device of a water chilling unit and the water chilling unit.
Background
Under the traditional regulation and control mode of the water chilling unit, the output of the water chilling unit is judged and adjusted by detecting the water supply temperature of chilled water and comparing the threshold value, for example, when the water supply temperature of the chilled water is lower than the preset threshold value, the output of the water chilling unit is unloaded. Because the chilled water supply water belongs to the refrigeration tail end output, after the water chilling unit is loaded and unloaded, the effect change has certain hysteresis when the chilled water supply water temperature is detected, and therefore, the chilled water temperature change has larger fluctuation under the regulation and control mode.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the application provides a load regulation control method and device of a water chilling unit and the water chilling unit, which are beneficial to reducing the fluctuation of the temperature change of chilled water.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect,
the application provides a load regulation control method of a water chilling unit, which comprises the following steps:
calculating the actual refrigerating capacity of a compressor of the water chilling unit and the temperature difference of an evaporator end of an evaporator of the water chilling unit;
determining a first adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity, and determining a second adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the temperature difference of the evaporator end;
and adjusting the opening degree of the electronic expansion valve of the water chilling unit according to the first adjustment component and the second adjustment component.
Further, wherein calculating the actual cooling capacity of the chiller compressor comprises:
acquiring the actual evaporation pressure, the actual condensation pressure and the compressor current of the water chilling unit;
calculating the actual full-load refrigerating capacity of the compressor under the conditions of the actual evaporation pressure and the actual condensation pressure according to the actual evaporation pressure and the actual condensation pressure; calculating the load factor of the water chilling unit according to the compressor current;
and calculating the actual refrigerating capacity according to the actual full-load refrigerating capacity and the load rate.
Further, the calculating an actual full-load refrigerating capacity of the compressor under the actual evaporating pressure and the actual condensing pressure according to the actual evaporating pressure and the actual condensing pressure includes:
acquiring rated evaporation pressure, rated condensation pressure and rated full-load refrigerating capacity under the rated working condition of a preset water chilling unit;
calculating an evaporation pressure deviation of the actual evaporation pressure with respect to the rated evaporation pressure, and calculating a condensation pressure deviation of the actual condensation pressure with respect to the rated condensation pressure;
and calculating the actual full-load refrigerating capacity by utilizing the evaporation pressure deviation and the condensation pressure deviation based on the rated full-load refrigerating capacity.
Further, the calculating the actual full-load refrigerating capacity by using the evaporation pressure deviation and the condensation pressure deviation based on the rated full-load refrigerating capacity includes:
according to a preset full-load refrigerating capacity formula: and calculating the actual full-load cooling capacity, wherein Q' is the actual full-load cooling capacity, Q is the rated full-load cooling capacity, Δ Pe is the evaporation pressure deviation, and Δ Pc is the condensation pressure deviation.
Further, the calculating the load factor of the water chilling unit according to the compressor current comprises:
according to a preset load factor formula: f (i), calculating the load factor;
where ψ is the load factor and I is the compressor current.
Further, wherein calculating the evaporator end temperature difference of the chiller evaporator comprises:
obtaining the outlet water temperature of the chilled water of the water chilling unit and the evaporation temperature of the evaporator;
and calculating the temperature difference at the evaporator end according to the outlet water temperature of the chilled water and the evaporation temperature.
Further, the determining a first adjustment component of the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity includes:
acquiring the actual refrigerating capacity at the current detection moment and the actual refrigerating capacity at the last detection moment;
if the actual refrigerating capacity at the current detection moment is smaller than the actual refrigerating capacity at the last detection moment, the first adjustment component is to reduce a first opening value;
if the actual refrigerating capacity at the current detection moment is larger than the actual refrigerating capacity at the last detection moment, the first adjustment component is to increase the first opening value;
and if the actual refrigerating capacity at the current detection moment is equal to the actual refrigerating capacity at the last detection moment, the first adjustment component is zero.
Further, the determining a second adjustment component of the opening of the electronic expansion valve of the water chilling unit according to the temperature difference at the evaporator end comprises:
if the temperature difference at the evaporator end is smaller than a preset temperature difference threshold value, the second adjustment component is to reduce a second opening value;
if the temperature difference at the evaporator end is greater than the preset temperature difference threshold value, the second adjustment component is to increase the second opening value;
and if the temperature difference of the evaporator end is equal to a preset temperature difference threshold value, the second adjustment component is zero.
Further, when the first adjustment component and the second adjustment component are determined, the current opening degree of the electronic expansion valve of the water chilling unit is within a preset opening degree range.
In a second aspect of the present invention,
the application provides a load regulation controlling means of cooling water set includes:
the calculation module is used for calculating the actual refrigerating capacity of a compressor of the water chilling unit and the temperature difference of an evaporator end of an evaporator of the water chilling unit;
the determining module is used for determining a first adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity and determining a second adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the temperature difference of the evaporator end;
and the adjusting module is used for adjusting the opening of the electronic expansion valve of the water chilling unit according to the first adjusting component and the second adjusting component.
In a third aspect,
the application provides a water chilling unit, including
One or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of any of the methods described above.
This application adopts above technical scheme, possesses following beneficial effect at least:
compare the regulation and control of threshold value that the refrigerated water supply temperature goes on than the refrigeration end, after the cooling water set add uninstallation, appear that the effect changes and have certain hysteresis quality to detecting the refrigerated water supply temperature, there is great volatility in the refrigerated water temperature change, this application is through the actual refrigerating output of calculating the cooling water set compressor and the evaporimeter end difference in temperature of cooling water set evaporimeter, and confirm the first adjustment weight and the second adjustment weight of cooling water set electronic expansion valve aperture respectively according to the two, adjust cooling water set electronic expansion valve's aperture with this, advance has, be more meticulous regulation and control, help reducing the volatility of refrigerated water temperature change.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method of load regulation control of a chiller according to an exemplary embodiment;
FIG. 2 is a block diagram of a load regulation control device of a chiller according to an exemplary embodiment;
fig. 3 is a block diagram configuration diagram illustrating a chiller according to an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart illustrating a load regulation control method of a chiller according to an exemplary embodiment, where as shown in fig. 1, the load regulation control method of the chiller includes the following steps:
step S101, calculating the actual refrigerating capacity of a compressor of the water chilling unit and the temperature difference of an evaporator end of an evaporator of the water chilling unit;
step S102, determining a first adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity, and determining a second adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the temperature difference of the evaporator end;
and S103, adjusting the opening of the electronic expansion valve of the water chilling unit according to the first adjustment component and the second adjustment component.
Specifically, compared with threshold value comparison regulation and control according to the chilled water supply temperature at the refrigeration tail end, after the water chilling unit is loaded and unloaded, certain hysteresis is provided until effect change of the chilled water supply temperature is detected, and the chilled water temperature change has large fluctuation. The method calculates the actual refrigerating capacity of the compressor of the water chilling unit and the temperature difference of the evaporator end of the evaporator of the water chilling unit, and respectively determining a first adjusting component and a second adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the first adjusting component and the second adjusting component to adjust the opening of the electronic expansion valve of the water chilling unit, compared with the threshold comparison judgment according to the chilled water supply temperature at the refrigeration tail end according to the actual refrigeration capacity of a compressor of the water chilling unit and the temperature difference at the evaporator end, the method has certain advance, and this application determines the first adjustment weight and the second adjustment weight of cooling water set electronic expansion valve aperture respectively according to the actual refrigerating output and the evaporimeter end difference in temperature of cooling water set compressor, and cancellation or reinforcing can be realized in the stack of both, is more meticulous regulation and control, and then can synthesize the volatility that realizes reducing the refrigerated water temperature change.
In one embodiment, for step S101, wherein calculating the actual cooling capacity of the chiller compressor comprises:
acquiring the actual evaporation pressure, the actual condensation pressure and the compressor current of the water chilling unit;
calculating the actual full-load refrigerating capacity of the compressor under the conditions of the actual evaporation pressure and the actual condensation pressure according to the actual evaporation pressure and the actual condensation pressure; calculating the load factor of the water chilling unit according to the compressor current;
and calculating the actual refrigerating capacity according to the actual full-load refrigerating capacity and the load rate.
Specifically, the technical idea of the above scheme of this application is that actual refrigerating output is not that direct measurement refrigerated water cold volume obtains, compares in relevant art, detects the actual refrigerating output of cooling water set through installing sensors such as thermometer, flowmeter at water system, and the above scheme of this application calculates according to cooling water set's actual evaporating pressure, actual condensing pressure and compressor current and obtains actual refrigerating output, and in the aspect of actual refrigerating output obtains, the actual refrigerating output that the above scheme of this application obtained has the advance.
In one embodiment, the calculating an actual full-load cooling capacity of the compressor at the actual evaporating pressure and the actual condensing pressure according to the actual evaporating pressure and the actual condensing pressure includes:
acquiring rated evaporation pressure, rated condensation pressure and rated full-load refrigerating capacity under the rated working condition of a preset water chilling unit;
calculating an evaporation pressure deviation of the actual evaporation pressure with respect to the rated evaporation pressure, and calculating a condensation pressure deviation of the actual condensation pressure with respect to the rated condensation pressure;
and calculating the actual full-load refrigerating capacity by utilizing the evaporation pressure deviation and the condensation pressure deviation based on the rated full-load refrigerating capacity.
Specifically, the concept of the scheme is that the actual full-load refrigerating capacity is obtained by taking two factors, namely evaporation pressure deviation and condensation pressure deviation, as comprehensive consideration factors on the basis of the rated full-load refrigerating capacity. The rated evaporation pressure Pe, the rated condensation pressure Pc and the rated full-load refrigerating capacity Q under the rated working condition of the preset water chilling unit are determined in advance and can be stored in a database in advance so as to be called and obtained at any time. The evaporation pressure deviation Δ Pe is equal to the actual evaporation pressure Pe '-the rated evaporation pressure Pe, and the condensation pressure deviation Δ Pc is equal to the actual condensation pressure Pc' -the rated condensation pressure Pc.
In one embodiment, calculating the actual full load capacity using the evaporating pressure deviation and the condensing pressure deviation based on the rated full load capacity includes:
according to a preset full-load refrigerating capacity formula: and calculating the actual full-load cooling capacity, wherein Q' is the actual full-load cooling capacity, Q is the rated full-load cooling capacity, Δ Pe is the evaporation pressure deviation, and Δ Pc is the condensation pressure deviation.
Specifically, a full load refrigeration capacity formula is utilized: q ' ═ Q × f (Δ Pe, Δ Pc), an actual full-load cooling capacity Q ' is calculated, where f (Δ Pe, Δ Pc) may be a binary polynomial of Δ Pe and Δ Pc, and the polynomial integrates Δ Pe and Δ Pc to calculate a coefficient for obtaining the actual full-load cooling capacity Q ', and in practical applications, taking N ═ 3 as an example, f (Δ Pe, Δ Pc) may be as follows:
f(ΔPe,ΔPc)＝(a1+a2*ΔPe+a3*ΔPe2+a4*ΔPe3)*(a5+a6*ΔPc+a7*ΔPc2+a8*ΔPc3)
wherein a 1-a 8 are constant calculation coefficients.
In one embodiment, the calculating the load factor of the chiller according to the compressor current comprises:
according to a preset load factor formula: f (i), calculating the load factor;
where ψ is the load factor and I is the compressor current.
Specifically, the scheme calculates the load factor of the chiller according to the compressor current, and for the formula f (I), which is a unitary equation of the compressor current I, in one embodiment, f (I) may be as follows: f (I) ═ I/I0Wherein, I0The running current of the compressor under the full load working condition is adopted. In practical applications, f (I) may also be an equation of degree N.
According to the actual full-load refrigerating capacity Q' and the load rate psi calculated in advance, the actual refrigerating capacity Q is calculated in advanceFruit of Chinese wolfberryAnd Q' psi, and providing the first adjustment component for determining the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity, and further obtaining the advanced prejudgment of the first adjustment component.
In one embodiment, for step S101, wherein calculating the evaporator end temperature difference of the chiller evaporator comprises:
obtaining the outlet water temperature of the chilled water of the water chilling unit and the evaporation temperature of the evaporator;
and calculating the temperature difference at the evaporator end according to the outlet water temperature of the chilled water and the evaporation temperature.
Specifically, the evaporator end temperature difference can be obtained by the following formula, and the evaporator end temperature difference is the chilled water outlet temperature-evaporation temperature. In practical applications, refrigeration is a cooling effect generated by the refrigerant liquid boiling and absorbing heat at a certain pressure in the evaporator. This pressure is the evaporation pressure, at which the corresponding temperature of the saturated gas of the refrigerant is called the evaporation temperature. Therefore, the evaporation temperature may be associated with the evaporation pressure, and only the evaporation pressure may be detected using a pre-configured association between the evaporation pressure and the evaporation temperature, and then the corresponding evaporation temperature may be determined using the association.
In one embodiment, for step S102, the determining a first adjustment component of the opening of the electronic expansion valve of the chiller according to the actual cooling capacity includes:
acquiring the actual refrigerating capacity at the current detection moment and the actual refrigerating capacity at the last detection moment;
if the actual refrigerating capacity at the current detection moment is smaller than the actual refrigerating capacity at the last detection moment, the first adjustment component is to reduce a first opening value;
if the actual refrigerating capacity at the current detection moment is larger than the actual refrigerating capacity at the last detection moment, the first adjustment component is to increase the first opening value;
and if the actual refrigerating capacity at the current detection moment is equal to the actual refrigerating capacity at the last detection moment, the first adjustment component is zero.
In one embodiment, for step S102, the determining a second adjustment component of the opening of the chiller electronic expansion valve according to the evaporator end temperature difference includes:
if the temperature difference at the evaporator end is smaller than a preset temperature difference threshold value, the second adjustment component is to reduce a second opening value;
if the temperature difference at the evaporator end is greater than the preset temperature difference threshold value, the second adjustment component is to increase the second opening value;
and if the temperature difference of the evaporator end is equal to a preset temperature difference threshold value, the second adjustment component is zero.
The following describes step S103 of adjusting the opening degree of the electronic expansion valve of the chiller unit according to the first adjustment component and the second adjustment component, specifically.
In practical applications, the following may be the case:
the first condition is as follows: the actual refrigerating capacity at the current detection moment is smaller than that at the last detection moment, and the first adjustment component is to reduce the first opening value; and the temperature difference at the evaporator end is smaller than a preset temperature difference threshold value, and the second adjustment component is to reduce the second opening value. In this case, both the first adjustment component and the second adjustment component are superimposed to achieve enhancement that achieves enhancement that reduces the opening degree of the electronic expansion valve.
Case two: the actual refrigerating capacity at the current detection moment is larger than that at the last detection moment, and the first adjustment component is to increase the first opening value; the temperature difference at the evaporator end is larger than a preset temperature difference threshold value, and the second adjustment component is to increase a second opening value; in this case, the first adjustment component and the second adjustment component are both superimposed to achieve enhancement that achieves enhancement that increases the opening degree of the electronic expansion valve.
Case three: the actual refrigerating capacity at the current detection moment is smaller than that at the last detection moment, and the first adjustment component is to reduce the first opening value; the temperature difference at the evaporator end is larger than a preset temperature difference threshold value, and the second adjustment component is to increase a second opening value; in this case, the first adjustment component and the second adjustment component are superimposed to cancel each other, and after the cancellation is determined according to the magnitudes of the first opening value and the second opening value, whether to increase the opening degree of the electronic expansion valve or decrease the opening degree of the electronic expansion valve is determined.
Case four: the actual refrigerating capacity at the current detection moment is larger than that at the last detection moment, and the first adjustment component is to increase the first opening value; and the temperature difference at the evaporator end is smaller than a preset temperature difference threshold value, and the second adjustment component is to reduce the second opening value. In this case, the superposition of the first adjustment component and the second adjustment component also achieves cancellation, and after the cancellation is determined according to the magnitudes of the first opening value and the second opening value, the opening degree of the electronic expansion valve is increased or decreased.
If the first opening value is larger than the second opening value, in the third case, the first adjustment component and the second adjustment component are superposed to realize cancellation, and the opening degree of the electronic expansion valve is reduced after the cancellation, and in the fourth case, the first adjustment component and the second adjustment component are superposed to realize cancellation, and the opening degree of the electronic expansion valve is increased after the cancellation.
And if the first opening value is smaller than the second opening value, in the third case, the first adjustment component and the second adjustment component are superposed to realize cancellation, and the opening degree of the electronic expansion valve is increased after the cancellation, and in the fourth case, the first adjustment component and the second adjustment component are superposed to realize cancellation, and the opening degree of the electronic expansion valve is decreased after the cancellation.
According to the above description, the first adjustment component and the second adjustment component are superposed to achieve cancellation or enhancement, so that finer regulation and control can be achieved, and further the fluctuation of the temperature change of the chilled water can be comprehensively reduced.
In one embodiment, when the first adjustment component and the second adjustment component are determined, the current opening degree of the electronic expansion valve of the water chilling unit is within a preset opening degree range.
Specifically, the opening range of the electronic expansion valve is set to [ N1, N2], the current opening of the electronic expansion valve is N, and the determination of the first adjustment component and the second adjustment component needs to be performed under the condition that N1 is not less than N2.
Referring to fig. 2, fig. 2 is a block diagram illustrating a load regulation control device of a water chilling unit according to an exemplary embodiment, and as shown in fig. 2, the load regulation control device 2 of the water chilling unit includes:
the calculating module 201 is used for calculating the actual refrigerating capacity of a compressor of the water chilling unit and the temperature difference of an evaporator end of an evaporator of the water chilling unit;
the determining module 202 is configured to determine a first adjustment component of the opening of the electronic expansion valve of the chiller according to the actual refrigerating capacity, and determine a second adjustment component of the opening of the electronic expansion valve of the chiller according to the temperature difference at the evaporator end;
and the adjusting module 203 is used for adjusting the opening of the electronic expansion valve of the water chilling unit according to the first adjusting component and the second adjusting component.
Further, the calculating module 201, wherein calculating the actual cooling capacity of the chiller compressor includes:
acquiring the actual evaporation pressure, the actual condensation pressure and the compressor current of the water chilling unit;
calculating the actual full-load refrigerating capacity of the compressor under the conditions of the actual evaporation pressure and the actual condensation pressure according to the actual evaporation pressure and the actual condensation pressure; calculating the load factor of the water chilling unit according to the compressor current;
and calculating the actual refrigerating capacity according to the actual full-load refrigerating capacity and the load rate.
Further, the calculating an actual full-load refrigerating capacity of the compressor under the actual evaporating pressure and the actual condensing pressure according to the actual evaporating pressure and the actual condensing pressure includes:
acquiring rated evaporation pressure, rated condensation pressure and rated full-load refrigerating capacity under the rated working condition of a preset water chilling unit;
calculating an evaporation pressure deviation of the actual evaporation pressure with respect to the rated evaporation pressure, and calculating a condensation pressure deviation of the actual condensation pressure with respect to the rated condensation pressure;
and calculating the actual full-load refrigerating capacity by utilizing the evaporation pressure deviation and the condensation pressure deviation based on the rated full-load refrigerating capacity.
Further, the calculating the actual full-load refrigerating capacity by using the evaporation pressure deviation and the condensation pressure deviation based on the rated full-load refrigerating capacity includes:
according to a preset full-load refrigerating capacity formula: and calculating the actual full-load cooling capacity, wherein Q' is the actual full-load cooling capacity, Q is the rated full-load cooling capacity, Δ Pe is the evaporation pressure deviation, and Δ Pc is the condensation pressure deviation.
Further, the calculating the load factor of the water chilling unit according to the compressor current comprises:
according to a preset load factor formula: f (i), calculating the load factor;
where ψ is the load factor and I is the compressor current.
Further, the calculating module 201, wherein calculating the evaporator end temperature difference of the chiller evaporator, includes:
obtaining the outlet water temperature of the chilled water of the water chilling unit and the evaporation temperature of the evaporator;
and calculating the temperature difference at the evaporator end according to the outlet water temperature of the chilled water and the evaporation temperature.
Further, the determining module 202, which determines the first adjustment component of the opening of the electronic expansion valve of the chiller according to the actual cooling capacity, includes:
acquiring the actual refrigerating capacity at the current detection moment and the actual refrigerating capacity at the last detection moment;
if the actual refrigerating capacity at the current detection moment is smaller than the actual refrigerating capacity at the last detection moment, the first adjustment component is to reduce a first opening value;
if the actual refrigerating capacity at the current detection moment is larger than the actual refrigerating capacity at the last detection moment, the first adjustment component is to increase the first opening value;
and if the actual refrigerating capacity at the current detection moment is equal to the actual refrigerating capacity at the last detection moment, the first adjustment component is zero.
Further, the determining module 202, which determines the second adjustment component of the opening of the electronic expansion valve of the chiller according to the evaporator end temperature difference, includes:
if the temperature difference at the evaporator end is smaller than a preset temperature difference threshold value, the second adjustment component is to reduce a second opening value;
if the temperature difference at the evaporator end is greater than the preset temperature difference threshold value, the second adjustment component is to increase the second opening value;
and if the temperature difference of the evaporator end is equal to a preset temperature difference threshold value, the second adjustment component is zero.
Further, when the first adjustment component and the second adjustment component are determined, the current opening degree of the electronic expansion valve of the water chilling unit is within a preset opening degree range.
With regard to the load regulation control device 2 of the water chilling unit in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be described in detail here.
Referring to fig. 3, fig. 3 is a block diagram schematically illustrating a water chiller according to an exemplary embodiment, and as shown in fig. 3, the water chiller 3 includes:
one or more memories 301 having executable programs stored thereon;
one or more processors 302 for executing the executable programs in the memory 301 to implement the steps of any of the methods described above.
With respect to the water chiller 3 in the above embodiment, the specific manner of executing the program in the memory 301 by the processor 302 has been described in detail in the embodiment related to the method, and will not be elaborated here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "plurality" means at least two unless otherwise specified.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, and further, as used herein, connected may include wirelessly connected; the term "and/or" is used to include any and all combinations of one or more of the associated listed items.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments or portions of code which include one or more executable instructions for implementing specific logical functions or steps of a process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (11)
1. A load regulation control method of a water chilling unit is characterized by comprising the following steps:
calculating the actual refrigerating capacity of a compressor of the water chilling unit and the temperature difference of an evaporator end of an evaporator of the water chilling unit;
determining a first adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity, and determining a second adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the temperature difference of the evaporator end;
and adjusting the opening degree of the electronic expansion valve of the water chilling unit according to the first adjustment component and the second adjustment component.
2. The method of claim 1, wherein calculating the actual cooling capacity of a chiller compressor comprises:
acquiring the actual evaporation pressure, the actual condensation pressure and the compressor current of the water chilling unit;
calculating the actual full-load refrigerating capacity of the compressor under the conditions of the actual evaporation pressure and the actual condensation pressure according to the actual evaporation pressure and the actual condensation pressure; calculating the load factor of the water chilling unit according to the compressor current;
and calculating the actual refrigerating capacity according to the actual full-load refrigerating capacity and the load rate.
3. The method of claim 2, wherein calculating an actual full-load capacity of the compressor at the actual evaporating pressure and the actual condensing pressure based on the actual evaporating pressure and the actual condensing pressure comprises:
acquiring rated evaporation pressure, rated condensation pressure and rated full-load refrigerating capacity under the rated working condition of a preset water chilling unit;
calculating an evaporation pressure deviation of the actual evaporation pressure with respect to the rated evaporation pressure, and calculating a condensation pressure deviation of the actual condensation pressure with respect to the rated condensation pressure;
and calculating the actual full-load refrigerating capacity by utilizing the evaporation pressure deviation and the condensation pressure deviation based on the rated full-load refrigerating capacity.
4. The method of claim 3, wherein calculating the actual full-load capacity using the evaporating pressure deviation and the condensing pressure deviation based on the nominal full-load capacity comprises:
according to a preset full-load refrigerating capacity formula: and calculating the actual full-load cooling capacity, wherein Q' is the actual full-load cooling capacity, Q is the rated full-load cooling capacity, Δ Pe is the evaporation pressure deviation, and Δ Pc is the condensation pressure deviation.
5. The method according to any one of claims 2-4, wherein said calculating a chiller load rate based on said compressor current comprises:
according to a preset load factor formula: f (i), calculating the load factor;
where ψ is the load factor and I is the compressor current.
6. The method of claim 1, wherein calculating the evaporator end temperature difference for a chiller evaporator comprises:
obtaining the outlet water temperature of the chilled water of the water chilling unit and the evaporation temperature of the evaporator;
and calculating the temperature difference at the evaporator end according to the outlet water temperature of the chilled water and the evaporation temperature.
7. The method of claim 1, wherein said determining a first adjustment component of chiller electronic expansion valve opening based on said actual cooling capacity comprises:
acquiring the actual refrigerating capacity at the current detection moment and the actual refrigerating capacity at the last detection moment;
if the actual refrigerating capacity at the current detection moment is smaller than the actual refrigerating capacity at the last detection moment, the first adjustment component is to reduce a first opening value;
if the actual refrigerating capacity at the current detection moment is larger than the actual refrigerating capacity at the last detection moment, the first adjustment component is to increase the first opening value;
and if the actual refrigerating capacity at the current detection moment is equal to the actual refrigerating capacity at the last detection moment, the first adjustment component is zero.
8. The method of claim 1, wherein determining a second adjustment component of chiller electronic expansion valve opening based on the evaporator end temperature differential comprises:
if the temperature difference at the evaporator end is smaller than a preset temperature difference threshold value, the second adjustment component is to reduce a second opening value;
if the temperature difference at the evaporator end is greater than the preset temperature difference threshold value, the second adjustment component is to increase the second opening value;
and if the temperature difference of the evaporator end is equal to a preset temperature difference threshold value, the second adjustment component is zero.
9. The method of claim 6 or 7, wherein, when determining the first adjustment component and the second adjustment component, a current opening degree of the chiller electronic expansion valve is within a preset opening degree range.
10. A load regulation control device of a water chilling unit is characterized by comprising:
the calculation module is used for calculating the actual refrigerating capacity of a compressor of the water chilling unit and the temperature difference of an evaporator end of an evaporator of the water chilling unit;
the determining module is used for determining a first adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the actual refrigerating capacity and determining a second adjusting component of the opening of the electronic expansion valve of the water chilling unit according to the temperature difference of the evaporator end;
and the adjusting module is used for adjusting the opening of the electronic expansion valve of the water chilling unit according to the first adjusting component and the second adjusting component.
11. A water chilling unit is characterized by comprising
One or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of the method of any one of claims 1-9.
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