CN107238180B - Air quantity control method and system of air-cooled water chilling unit - Google Patents
Air quantity control method and system of air-cooled water chilling unit Download PDFInfo
- Publication number
- CN107238180B CN107238180B CN201710484400.8A CN201710484400A CN107238180B CN 107238180 B CN107238180 B CN 107238180B CN 201710484400 A CN201710484400 A CN 201710484400A CN 107238180 B CN107238180 B CN 107238180B
- Authority
- CN
- China
- Prior art keywords
- air
- compressor
- water chilling
- chilling unit
- cooled water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air quantity control method and system of an air-cooled water chilling unit. The control method comprises the following steps: determining a target exhaust pressure ratio of the compressor according to the operating environment temperature of the air-cooled water chilling unit, the operating evaporation parameter of an evaporator of the air-cooled water chilling unit or the air suction parameter of the compressor and the electrical performance parameter of the compressor; comparing the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit in real time; and adjusting the air quantity of a fan at the condenser side of the air-cooled water chilling unit in real time according to the comparison result. The method includes the steps that the actual running state of the whole air-cooled water chilling unit is represented by introducing the running performance parameters of the compressor, the air volume requirements of the air volume of the fan on the air volume of the compressor and the pressure difference between the condensing pressure and the evaporating pressure of the air-cooled water chilling unit are considered, and the air volume of the fan on the condenser side is adjusted in real time according to the comparison result of the air volume and the condensing pressure and the evaporating pressure of the air-cooled water chilling unit, so that the air-cooled water chilling unit.
Description
Technical Field
The invention relates to the technical field of air-cooled water chilling units, in particular to an air volume control method and system of an air-cooled water chilling unit.
Background
The air-cooled water chiller is a main cold source device of an air conditioning system, and generally comprises a compressor, a condenser, an evaporator, a cooling fan and an expansion valve, wherein the cooling fan cools the condenser, and a refrigerant in the evaporator absorbs heat during working, so that a cold source is provided for the air conditioning system.
In present air-cooled cooling water set, fan control adopts the mode of control exhaust and suction pressure difference or condensation pressure, control fan opening quantity and rotational speed, the operation is under the partial load condition, it can not match to appear fan operation and compressor running state easily, cause the compressor operation at the partial load, but the fan is open entirely, perhaps fan operation quantity reduces, the compressor operation is at higher load, the fan frequently appears in above circumstances and adjusts or open and stop easily, long-time operation can cause fan damage and efficiency to reduce. The performance of the unit cannot be better exerted when the unit is partially loaded, and the energy efficiency of the unit cannot reach the optimal state.
Disclosure of Invention
According to a first aspect of embodiments of the present invention, there is provided an air volume control method for an air-cooled chiller, the air-cooled chiller including a compressor, a condenser and an evaporator connected to the compressor, and a fan provided on the condenser side for cooling the condenser, the control method including:
determining a target exhaust pressure ratio of a compressor of the air-cooled water chilling unit according to the operating environment temperature of the air-cooled water chilling unit, the operating evaporation parameter of an evaporator of the air-cooled water chilling unit or the air suction parameter of the compressor and the electrical performance parameter of the compressor of the air-cooled water chilling unit;
comparing the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit in real time;
and adjusting the air quantity of a fan at the condenser side of the air-cooled water chilling unit in real time according to the comparison result.
The air quantity control method of the air-cooled water chilling unit is further improved in that the electrical performance parameters of the compressor comprise the current percentage of the running of the compressor, the power percentage of the compressor or the power of the compressor.
The air volume control method of the air-cooled water chilling unit is further improved in that the electrical performance parameter of the compressor is the current percentage of the running of the compressor, the air-cooled water chilling unit comprises at least one refrigeration loop, and the control method further comprises the following steps:
and determining the operating current percentage of the compressor of the air-cooled water chilling unit according to the ratio of the actual operating current value of the compressor in the refrigeration loop to the maximum current value allowed by the compressor in the refrigeration loop.
The air quantity control method of the air-cooled water chilling unit is further improved in that the refrigeration loop comprises a plurality of compressors, and the operating current percentage of the compressor of each refrigeration loop of the air-cooled water chilling unit is determined according to the ratio of the sum of the actual operating current values of each compressor in the refrigeration loop to the sum of the maximum current values allowed by each compressor in the refrigeration loop.
The air quantity control method of the air-cooled water chilling unit is further improved in that the air quantity of a fan at the condenser side of the air-cooled water chilling unit is adjusted in real time according to the comparison result, and the method comprises the following steps:
comparing the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit with a target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, and increasing the air volume of a fan at the condenser side of the air-cooled water chilling unit to enable the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit to be in accordance with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit;
and comparing the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit with a target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, and reducing the air quantity of a fan at the condenser side of the air-cooled water chilling unit to enable the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit to be in accordance with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit.
The air quantity control method of the air-cooled water chilling unit is further improved in that the air quantity of a fan at the condenser side of the air-cooled water chilling unit is adjusted in real time according to the comparison result, and the method comprises the following steps:
and comparing the difference between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, wherein the difference exceeds a set difference range, and adjusting the air quantity of a fan at the condenser side of the air-cooled water chilling unit to enable the difference between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit to be in accordance with the set difference range.
The air quantity control method of the air-cooled water chilling unit is further improved in that the evaporation parameters comprise evaporation temperature or evaporation pressure; the inspiratory parameters include a saturated inspiratory temperature or an inspiratory pressure.
According to a second aspect of the embodiments of the present invention, there is provided an air volume control system of an air-cooled chiller, the air-cooled chiller including a compressor, a condenser and an evaporator connected to the compressor, and a fan provided on the condenser side for cooling the condenser, the control system including:
the environment temperature detection module is configured to detect the environment temperature of the running of the air-cooled water chilling unit;
the parameter detection module is configured to detect an evaporation parameter of the operation of an evaporator of the air-cooled chiller or an air suction parameter of the compressor;
the electrical performance parameter determination module is configured to determine the electrical performance parameter of the compressor of the air-cooled water chilling unit;
the exhaust pressure ratio determining module is connected with the environment temperature detecting module, the parameter detecting module and the electrical performance parameter determining module, and is configured to determine a target exhaust pressure ratio of a compressor of the air-cooled chiller according to the environment temperature of the air-cooled chiller in operation detected by the environment temperature detecting module, the evaporation parameter of the air-cooled chiller in operation or the air suction parameter of the compressor detected by the parameter detecting module and the electrical performance parameter of the compressor of the air-cooled chiller determined by the electrical performance parameter determining module;
the comparison module is connected with the exhaust pressure ratio determination module and is configured to compare the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit determined by the exhaust pressure ratio determination module with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit in real time;
and the adjusting module is connected with the comparison module and is configured to adjust the air volume of a fan at the condenser side of the air-cooled water chilling unit in real time according to the comparison result of the comparison module.
The air volume control system of the air-cooled water chilling unit is further improved in that the electrical performance parameters of the compressor comprise the current percentage of the running of the compressor, the power percentage of the compressor or the power of the compressor.
The air volume control system of the air-cooled water chilling unit is further improved in that the electrical performance parameter of the compressor is the current percentage of the running of the compressor, the air-cooled water chilling unit comprises at least one refrigeration loop, and the electrical performance parameter determination module is further configured to determine the current percentage of the running of the compressor of the air-cooled water chilling unit according to the ratio of the actual running current value of the compressor in the refrigeration loop to the maximum current value allowed by the compressor in the refrigeration loop.
The air volume control system of the air-cooled water chilling unit is further improved in that the refrigeration loop comprises a plurality of compressors, and the electrical performance parameter determination module is further configured to determine the current percentage of the operation of the compressors of each refrigeration loop of the air-cooled water chilling unit according to the ratio of the sum of the actual operation current values of each compressor in the refrigeration loop to the sum of the maximum current values allowed by each compressor in the refrigeration loop.
In the air volume control system of the air-cooled chiller according to the present invention, the adjusting module is further configured to:
when the comparison module compares that the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit is larger than the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, the air volume of a fan on the condenser side of the air-cooled water chilling unit is increased, and the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit is made to accord with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit;
and when the comparison module compares that the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit is smaller than the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, reducing the air volume of a fan at the condenser side of the air-cooled water chilling unit, so that the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit.
In the air volume control system of the air-cooled chiller according to the present invention, the adjusting module is further configured to:
and when the comparison module compares that the difference value between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit exceeds the set difference range, adjusting the air quantity of a fan at the condenser side of the air-cooled water chilling unit to enable the difference value between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit to accord with the set difference range.
The air volume control system of the air-cooled water chilling unit is further improved in that the evaporation parameters comprise evaporation temperature or evaporation pressure; the inspiratory parameters include a saturated inspiratory temperature or an inspiratory pressure.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the invention represents the actual running state of the whole air-cooled water chilling unit by introducing the electrical performance parameters of the compressor, the electrical performance parameters of the compressor can be used as the representation of the actual load and the running condition of the air-cooled water chilling unit, the control input is simplified, the requirements of the refrigerant air delivery quantity of the compressor and the pressure difference of the condensing pressure and the evaporating pressure of the air-cooled water chilling unit on the air quantity of the fan are considered at the same time, the two coupling factors are combined into one, and the air quantity of the fan at the condenser side is adjusted in real time according to the comparison result of the two coupling factors, so that the air-cooled water chilling unit can achieve the optimal energy efficiency ratio and is always in the optimal working state.
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 invention, as claimed.
Drawings
Fig. 1 is a schematic structural view of an air-cooled chiller according to an exemplary embodiment of the present invention;
fig. 2 is a flowchart illustrating an air volume control method of an air-cooled chiller according to an exemplary embodiment of the present invention;
fig. 3 is a detailed flowchart of an air volume control method of an air-cooled chiller according to an exemplary embodiment of the present invention;
fig. 4 is a block diagram showing a structure of an air volume control system of an air-cooled chiller according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
In the following, the air volume control method and system of the air-cooled chiller according to the present invention will be described in detail with reference to the accompanying drawings, and features of the following embodiments and embodiments may be combined with each other without conflict.
The embodiment of the invention provides an air quantity control method of an air-cooled water chilling unit, which can be applied to the air-cooled water chilling unit. Referring to fig. 1, the air-cooled chiller includes a compressor 91, a condenser 92 and an evaporator 93 connected to the compressor 91, an expansion valve 94 connected between the condenser 92 and the evaporator 93, and a fan 95 disposed on the condenser 92 side for cooling the condenser 92. The low-temperature low-pressure refrigerant gas after evaporation and refrigeration is sucked by the compressor 91 and then compressed into high-temperature high-pressure gas which is sent to the condenser 92, the high-pressure high-temperature gas is cooled by the condenser 92 to be condensed into normal-temperature high-pressure liquid, when the normal-temperature high-pressure liquid flows into the thermostatic expansion valve 94, the normal-temperature high-pressure liquid is throttled into low-temperature low-pressure wet vapor and flows into the shell tube evaporator 93, the heat of the chilled water in the evaporator 93 is absorbed to reduce the temperature of the water, the evaporated refrigerant is sucked back into the compressor 91, and the next refrigeration cycle is repeated, so that the.
Referring to fig. 2, the air quantity control method of the air-cooled chiller of the present invention includes the following steps:
step S01: and determining the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit according to the operating environment temperature of the air-cooled water chilling unit, the operating evaporation parameter of the evaporator 93 of the air-cooled water chilling unit or the air suction parameter of the compressor 91 and the electrical performance parameter of the compressor 91 of the air-cooled water chilling unit. Optionally, the evaporation parameter comprises an evaporation temperature or an evaporation pressure, and the inhalation parameter comprises a saturated inhalation temperature or an inhalation pressure. Optionally, the electrical performance parameter of the compressor 91 comprises a current percentage, a compressor power percentage, or a compressor power at which the compressor 91 is operated.
Step S02: and comparing the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit with the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit in real time.
Step S03: and adjusting the air quantity of a fan 95 at the condenser 92 side of the air-cooled water chilling unit in real time according to the comparison result.
In the present embodiment, the actually required target discharge pressure ratio of the compressor 91 is determined by the calculation formula: PRStPt＝a·x1+b·x2+c·x3+ d. Wherein, PRStPtIs the target discharge pressure ratio of the compressor 91 of the air-cooled chiller; x is the number of1The temperature is the operating environment temperature of the air-cooled water chilling unit; x is the number of2Is the evaporation parameter of the evaporator 93 of the air-cooled chiller or the suction parameter of the compressor; x is the number of3Is an electrical performance parameter of the compressor 91 of the air-cooled chiller; a, b, c and d are a set of constants obtained based on the parameters of the air-cooled water chilling unit. With x2Evaporation temperature, x, for operation of evaporator 933For example, when the current percentage of the air-cooled chiller unit operated by the compressor 91 is given as an example, the four parameters a, b, c, and d are respectively-0.0685, 0.04 for b, 0.017 for c, and 1.548 for d, when the ambient temperature x is higher than the set temperature x1At 20C (DEG C), the evaporation temperature x at which the unit evaporator 93 operates2At 5C (DEG C), the current percentage x at which the unit compressor 91 operates3At 50%, the target pressure ratio was found to be 2.913, which is x in this example2Evaporation temperature, x, for operation of evaporator 933For the example of the percentage of current for the operation of the compressor 91, the same calculation is performed using other parameters. When the pressure ratio of the compressor 91 of the measurement unit is measuredIf the measured pressure ratio is greater than 2.913, the fan 95 on the condenser 92 side is controlled to increase the air volume, and conversely, the air volume of the fan 95 on the condenser 92 side is decreased, so that the measured pressure ratio matches the target pressure ratio. That is, in the above calculation formula, the ambient temperature of the operation of the air-cooled chiller, the evaporation parameter of the operation of the evaporator 93 of the air-cooled chiller or the suction parameter of the compressor, and the electrical performance parameter of the compressor 91 of the air-cooled chiller are variables, simplifying the control input, meanwhile, the electrical performance parameters of the compressor 91 of the air-cooled chiller unit are very easy to read from the driving of the compressor 91, the target discharge pressure ratio of the compressor 91 of the air-cooled water chilling unit can be determined by detecting and inputting the three data values, and the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is compared with the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit in real time, and the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit is adjusted in real time, so that the air-cooled water chilling unit can achieve the optimal energy efficiency ratio and is always in the optimal working state.
The air volume control method of the air-cooled water chilling unit characterizes the actual running state of the whole air-cooled water chilling unit by introducing the electrical performance parameters of the compressor 91, the electrical performance parameters of the compressor 91 can be used as the characterization of the actual load and the running condition of the air-cooled water chilling unit, the control input is simplified, the requirements of the refrigerant air volume of the compressor 91 and the pressure difference between the condensing pressure and the evaporating pressure of the air-cooled water chilling unit on the air volume of the fan 95 are considered, the two coupling factors are combined into one, the air volume of the fan 95 on the side of the condenser 92 is adjusted in real time according to the comparison result of the two coupling factors, the air volume on the side of the condenser 92 is supplied according to the requirements, the air-cooled water chilling unit can achieve the optimal energy efficiency ratio and is always in the optimal working state.
In the air volume control method of the air-cooled water chilling unit, the air-cooled water chilling unit can adopt a multi-loop design (two or more independent refrigerating systems can share or do not share a waterway system), and the compressor 91 in each refrigerating loop (or each refrigerating system) expands the maximum refrigerating capacity range of the whole air-cooled water chilling unit on one hand in a parallel connection mode and can improve the energy efficiency ratio under partial load.
In an alternative embodiment, the electrical performance parameter of the compressor 91 is a current percentage of the operation of the compressor 91, the air-cooled chiller includes at least one refrigeration circuit, and the control method further includes step S011: and determining the operating current percentage of the compressor 91 of the air-cooled water chilling unit according to the ratio of the actual operating current value of the compressor 91 in the refrigeration loop to the maximum allowable current value of the compressor 91 in the refrigeration loop.
In this embodiment, taking a dual-loop single compressor as an example, the percentage of current of the compressor 91 of the air-cooled chiller is equal to the ratio of the actual operating current value of the compressor 91 in the refrigeration loop to the maximum current value allowed by the compressor 91 in the refrigeration loop. For example, if only one compressor a is included in a refrigeration circuit, the percentage of current flowing through the compressor 91 of the air-cooled chiller is equal to the actual operating current I of the compressor aAThe maximum current value I allowed in the refrigeration circuit with the compressor AA-MAXThe ratio of (a) to (b).
In an alternative embodiment, the refrigeration circuit includes a plurality of compressors 91, and the control method further includes step S011': and determining the current percentage of the operation of the compressor 91 of each refrigeration loop of the air-cooled water chilling unit according to the ratio of the sum of the actual operation current values of each compressor 91 in the refrigeration loop to the sum of the maximum current values allowed by each compressor 91 in the refrigeration loop.
In the present embodiment, taking a dual-loop dual-compressor as an example, the percentage of current operated by the compressor 91 of the air-cooled chiller is equal to the ratio of the sum of the actual operating current values of each compressor 91 in the refrigeration loop to the sum of the maximum current values allowed by each compressor 91 in the refrigeration loop. For example, if a refrigeration circuit includes a compressor a and a compressor B, then the percentage of current that is operated by the compressor 91 of the air-cooled chiller is equal to the actual operating current I of the compressor aAAnd the actual running current value I of the compressor BBThe sum of which and the maximum current value I allowed for the compressor A in the refrigeration circuitA-MAXAnd the maximum current value I allowed by the compressor B in the refrigeration circuitB-MAXThe ratio of the sum is large or small. If only the compressor A is started, the current percentage of the compressor 91 of the air-cooled water chilling unit is equal to the actual operation current value I of the compressor AAThe maximum current value I allowed in the refrigeration circuit with the compressor AA-MAXAnd the maximum current value I allowed by the compressor B in the refrigeration circuitB-MAXThe ratio of the sum is large or small. If only the compressor B is started, the current percentage of the compressor 91 of the air-cooled water chilling unit is equal to the actual operation current value I of the compressor BBThe maximum current value I allowed in the refrigeration circuit with the compressor AA-MAXAnd the maximum current value I allowed by the compressor B in the refrigeration circuitB-MAXThe ratio of the sum is large or small. If the refrigeration circuit includes more than two compressors, the calculation is the same as when the refrigeration circuit includes two compressors.
Referring to fig. 3, in an alternative embodiment, in step S03, the adjusting the air volume of the fan 95 on the condenser 92 side of the air-cooled chiller unit in real time according to the comparison result further includes:
step S031: and comparing that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is larger than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit, and increasing the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit to enable the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit to be in accordance with the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit.
Step S032: and comparing that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is smaller than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit, and reducing the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit to enable the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit to be in accordance with the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit.
In an optional embodiment, in the step S03, the method for adjusting the air volume of the fan 95 on the condenser 92 side of the air-cooled chiller unit in real time according to the comparison result further includes the step S033:
and comparing the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit, wherein the difference exceeds a set difference range (optionally 0.05-0.2), and adjusting the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit to enable the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit to accord with the set difference range.
When the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is larger than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit exceeds the maximum value (optionally 0.2) of the set difference range, the air volume of the fan 95 on the side of the condenser 92 of the air-cooled water chilling unit is increased, so that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit. When the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is smaller than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit exceeds the minimum value (optionally 0.05) of the set difference range, the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit is reduced, so that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit.
As can be seen from table 1 below, the total Energy Efficiency (EER) of the air-cooled chiller can be maximized when the air volume of the fan 95 reaches 41% by using the air volume control method of the air-cooled chiller according to the present invention.
| Percentage of air flow | Unit of | 33％ | 41％ | 100％ |
| Refrigerating capacity of unit | kW | 169.25 | 172.30 | 169.40 |
| Unit COP | kW/kW | 6.87 | 7.14 | 4.29 |
| Unit exhaust pressure ratio | NONE | 2.16 | 2.07 | 1.78 |
TABLE 1
Referring to fig. 4, an embodiment of the present invention further provides an air volume control system of an air-cooled chiller, which is used for implementing the air volume control method of the air-cooled chiller, and the control system includes:
and the ambient temperature detection module 10 is configured to detect the ambient temperature of the running of the air-cooled water chilling unit.
And the parameter detection module 20 is configured to detect an evaporation parameter of the operation of the evaporator 93 of the air-cooled chiller or an air suction parameter of the compressor. Optionally, the evaporation parameter comprises an evaporation temperature or an evaporation pressure, and the inhalation parameter comprises a saturated inhalation temperature or an inhalation pressure.
An electrical performance parameter determination module 30 configured to determine an electrical performance parameter of a compressor 91 of the air-cooled chiller. Optionally, the electrical performance parameter of the compressor 91 comprises a current percentage, a compressor power percentage, or a compressor power at which the compressor 91 is operated.
And an exhaust pressure ratio determination module 40, connected to the ambient temperature detection module 10, the parameter detection module 20, and the electrical performance parameter determination module 30, configured to determine a target exhaust pressure ratio of the compressor 91 of the air-cooled chiller according to the ambient temperature of the air-cooled chiller in operation detected by the ambient temperature detection module 10, the evaporation parameter or the suction parameter of the compressor of the air-cooled chiller in operation detected by the parameter detection module 20, and the electrical performance parameter of the compressor 91 of the air-cooled chiller determined by the electrical performance parameter determination module 30.
And the comparison module 50 is connected with the exhaust pressure ratio determination module 40 and configured to compare the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit determined by the exhaust pressure ratio determination module 40 with the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit in real time.
And the adjusting module 60 is connected with the comparing module 50 and configured to adjust the air volume of the fan 95 on the condenser 92 side of the air-cooled chiller unit in real time according to the comparison result of the comparing module 50.
In this embodiment, the target exhaust pressure ratio of the compressor 91 of the air-cooled chiller can be determined by detecting and inputting three data values, namely, the operating ambient temperature of the air-cooled chiller, the operating evaporation parameter of the evaporator 93 of the air-cooled chiller or the air suction parameter of the compressor, and the electrical performance parameter of the compressor 91 of the air-cooled chiller, and the actual exhaust pressure ratio of the compressor 91 of the air-cooled chiller is compared with the target exhaust pressure ratio of the compressor 91 of the air-cooled chiller in real time to adjust the air volume of the fan 95 on the condenser 92 side of the air-cooled chiller in real time, so that the air-cooled chiller can achieve the optimal energy efficiency ratio and is always in the optimal working state.
According to the air volume control method of the air-cooled water chilling unit, the actual operation state of the whole air-cooled water chilling unit is represented by introducing the electrical performance parameters of the compressor 91, the electrical performance parameters of the compressor 91 can be used as the representation of the actual load and the operation condition of the air-cooled water chilling unit, the control input is simplified, the requirements of the air volume of the fan 95 by the air delivery volume of the compressor 91 and the pressure difference between the condensing pressure and the evaporating pressure of the air-cooled water chilling unit are considered, the two coupling factors are combined into one, the air volume of the fan 95 on the side of the condenser 92 is adjusted in real time according to the comparison result of the two coupling factors, the air volume on the side of the condenser 92 is supplied according to the requirements, the air-cooled water chilling unit can achieve the optimal energy efficiency ratio and is always.
In an alternative embodiment, the electrical performance parameter of the compressor 91 is a current percentage of the operation of the compressor 91, the air-cooled chiller includes at least one refrigeration circuit, and the electrical performance parameter determination module 30 is further configured to determine the current percentage of the operation of the compressor 91 of the air-cooled chiller according to a ratio of an actual operation current value of the compressor 91 in the refrigeration circuit to a maximum current value allowed by the compressor 91 in the refrigeration circuit.
Further, the refrigeration circuit includes a plurality of compressors 91, and the electrical performance parameter determining module 30 is further configured to determine the percentage of current for operating the compressors 91 of each refrigeration circuit of the air-cooled chiller according to the ratio of the sum of the actual operating current values of each compressor 91 in the refrigeration circuit to the sum of the maximum current values allowed for each compressor 91 in the refrigeration circuit.
In an optional embodiment, the adjusting module 60 is further configured to:
when the comparison module 50 compares that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is greater than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit, the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit is increased, so that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit;
when the comparison module 50 compares that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is smaller than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit, the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit is reduced, so that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit.
In an optional embodiment, the adjusting module 60 is further configured to:
when the comparison module 50 compares that the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled chiller and the target exhaust pressure ratio of the compressor 91 of the air-cooled chiller exceeds the set difference range, the air volume of the fan 95 on the condenser 92 side of the air-cooled chiller is adjusted, so that the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled chiller and the target exhaust pressure ratio of the compressor 91 of the air-cooled chiller conforms to the set difference range. When the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is greater than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit exceeds the maximum value (optionally 0.2) of the set difference range, the air volume of the fan 95 on the side of the condenser 92 of the air-cooled water chilling unit is increased, so that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit. When the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit is smaller than the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the difference between the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit exceeds the minimum value (optionally 0.05) of the set difference range, the air volume of the fan 95 on the condenser 92 side of the air-cooled water chilling unit is reduced, so that the actual exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor 91 of the air-cooled water chilling unit.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (13)
1. An air volume control method of an air-cooled water chilling unit, wherein the air-cooled water chilling unit comprises a compressor, a condenser and an evaporator which are connected with the compressor, and a fan which is arranged on the side of the condenser and used for cooling the condenser, and the control method is characterized by comprising the following steps:
according to the operating environment temperature of the air-cooled water chilling unit, the operating evaporation parameter of an evaporator of the air-cooled water chilling unit or the air suction parameter of a compressor and the electrical performance parameter of the compressor of the air-cooled water chilling unit, weighting and summing the operating environment temperature of the air-cooled water chilling unit, the operating evaporation parameter of the evaporator of the air-cooled water chilling unit or the air suction parameter of the compressor and the electrical performance parameter of the compressor of the air-cooled water chilling unit, and determining the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit; wherein the compressor electrical performance parameter is the current percentage of the compressor operation;
comparing the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit in real time;
and adjusting the air quantity of a fan at the condenser side of the air-cooled water chilling unit in real time according to the comparison result.
2. The air volume control method of the air-cooled chiller according to claim 1, wherein the compressor electrical performance parameter is a current percentage of a compressor running, the air-cooled chiller comprises at least one refrigeration loop, and the control method further comprises:
and determining the operating current percentage of the compressor of the air-cooled water chilling unit according to the ratio of the actual operating current value of the compressor in the refrigeration loop to the maximum current value allowed by the compressor in the refrigeration loop.
3. The air volume control method of the air-cooled water chilling unit as claimed in claim 2, wherein the refrigeration circuit comprises a plurality of compressors, and the percentage of the current of the compressor of each refrigeration circuit of the air-cooled water chilling unit is determined according to the ratio of the sum of the actual operation current values of each compressor in the refrigeration circuit to the sum of the maximum current values allowed by each compressor in the refrigeration circuit.
4. The air volume control method of the air-cooled chiller according to claim 1, wherein the adjusting of the air volume of the fan on the condenser side of the air-cooled chiller in real time according to the comparison result comprises:
comparing the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit with a target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, and increasing the air volume of a fan at the condenser side of the air-cooled water chilling unit to enable the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit to be in accordance with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit;
and comparing the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit with a target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, and reducing the air quantity of a fan at the condenser side of the air-cooled water chilling unit to enable the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit to be in accordance with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit.
5. The air volume control method of the air-cooled chiller according to claim 1, wherein the adjusting of the air volume of the fan on the condenser side of the air-cooled chiller in real time according to the comparison result comprises:
and comparing the difference between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, wherein the difference exceeds a set difference range, and adjusting the air quantity of a fan at the condenser side of the air-cooled water chilling unit to enable the difference between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit to be in accordance with the set difference range.
6. The air volume control method of the air-cooled chiller according to claim 1, wherein the evaporation parameter comprises an evaporation temperature or an evaporation pressure; the inspiratory parameters include a saturated inspiratory temperature or an inspiratory pressure.
7. The utility model provides an amount of wind control system of air-cooled cooling water set, air-cooled cooling water set include the compressor, with condenser and evaporimeter that the compressor is connected and set up in the condenser side is used for right the condenser carries out refrigerated fan, its characterized in that, control system includes:
the environment temperature detection module is configured to detect the environment temperature of the running of the air-cooled water chilling unit;
the parameter detection module is configured to detect an evaporation parameter of the operation of an evaporator of the air-cooled chiller or an air suction parameter of the compressor;
the electrical performance parameter determination module is configured to determine the electrical performance parameter of the compressor of the air-cooled water chilling unit;
an exhaust pressure ratio determination module, connected to the environment temperature detection module, the parameter detection module and the electrical performance parameter determination module, configured to perform weighting processing and summing on the environment temperature at which the air-cooled chiller unit operates, the evaporation parameter at which the evaporator of the air-cooled chiller unit operates or the suction parameter of the compressor, which are detected by the parameter detection module, and the electrical performance parameter of the compressor of the air-cooled chiller unit, which is determined by the electrical performance parameter determination module, and determine a target exhaust pressure ratio of the compressor of the air-cooled chiller unit;
the comparison module is connected with the exhaust pressure ratio determination module and is configured to compare the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit determined by the exhaust pressure ratio determination module with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit in real time;
and the adjusting module is connected with the comparison module and is configured to adjust the air volume of a fan at the condenser side of the air-cooled water chilling unit in real time according to the comparison result of the comparison module.
8. The air volume control system of the air-cooled chiller according to claim 7, wherein the compressor electrical performance parameter comprises a compressor operating current percentage, a compressor power percentage, or a compressor power.
9. The air volume control system of the air-cooled chiller according to claim 8, wherein the compressor electrical performance parameter is a current percentage of compressor operation, the air-cooled chiller comprises at least one refrigeration circuit, and the electrical performance parameter determination module is further configured to determine the current percentage of compressor operation of the air-cooled chiller according to a ratio of an actual operation current value of a compressor in the refrigeration circuit to a maximum current value allowed by the compressor in the refrigeration circuit.
10. The air volume control system of the air-cooled chiller according to claim 9, wherein the refrigeration circuit comprises a plurality of compressors, and the electrical performance parameter determination module is further configured to determine the percentage of current for the operation of the compressors of the air-cooled chiller according to the ratio of the sum of the actual operating current values of each compressor in the refrigeration circuit to the sum of the maximum current values allowed for each compressor in the refrigeration circuit.
11. The air volume control system of the air-cooled chiller according to claim 7, wherein the regulating module is further configured to:
when the comparison module compares that the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit is larger than the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, the air volume of a fan on the condenser side of the air-cooled water chilling unit is increased, and the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit is made to accord with the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit;
and when the comparison module compares that the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit is smaller than the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit, reducing the air volume of a fan at the condenser side of the air-cooled water chilling unit, so that the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit meets the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit.
12. The air volume control system of the air-cooled chiller according to claim 7, wherein the regulating module is further configured to:
and when the comparison module compares that the difference value between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit exceeds the set difference range, adjusting the air quantity of a fan at the condenser side of the air-cooled water chilling unit to enable the difference value between the actual exhaust pressure ratio of the compressor of the air-cooled water chilling unit and the target exhaust pressure ratio of the compressor of the air-cooled water chilling unit to accord with the set difference range.
13. The air volume control system of the air-cooled chiller according to claim 7, wherein the evaporation parameter comprises an evaporation temperature or an evaporation pressure; the inspiratory parameters include a saturated inspiratory temperature or an inspiratory pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484400.8A CN107238180B (en) | 2017-06-23 | 2017-06-23 | Air quantity control method and system of air-cooled water chilling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484400.8A CN107238180B (en) | 2017-06-23 | 2017-06-23 | Air quantity control method and system of air-cooled water chilling unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107238180A CN107238180A (en) | 2017-10-10 |
| CN107238180B true CN107238180B (en) | 2020-07-07 |
Family
ID=59987767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710484400.8A Active CN107238180B (en) | 2017-06-23 | 2017-06-23 | Air quantity control method and system of air-cooled water chilling unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107238180B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10175681B2 (en) | 2014-05-01 | 2019-01-08 | Johnson Controls Technology Company | High level central plant optimization |
| CN108006919B (en) * | 2017-11-15 | 2020-02-11 | 珠海格力电器股份有限公司 | Evaporative cooling type water chilling unit, and control method and control system thereof |
| CN108036568A (en) * | 2017-11-24 | 2018-05-15 | 淮北智淮科技有限公司 | A kind of cooling water circulation machine |
| CN109708273B (en) * | 2018-12-29 | 2021-10-08 | 广东美的暖通设备有限公司 | Control method and device for low-temperature refrigerating air valve |
| CN110006140A (en) * | 2019-03-04 | 2019-07-12 | 青岛海尔空调电子有限公司 | Control method and air-cooled magnetic suspension unit for air-cooled magnetic suspension unit |
| CN111457628B (en) * | 2020-04-17 | 2021-11-23 | 特灵空调系统(中国)有限公司 | Cold water device and control method for optimizing refrigerant charge |
| CN112628895B (en) * | 2020-12-28 | 2022-10-28 | 青岛海尔空调电子有限公司 | Direct expansion type air conditioning unit and control method thereof |
| CN115628530A (en) * | 2022-10-26 | 2023-01-20 | 珠海格力电器股份有限公司 | Fan control method, device and unit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100656164B1 (en) * | 2005-12-21 | 2006-12-13 | 삼성전자주식회사 | Air conditioner and its control method |
| US8702482B2 (en) * | 2004-12-07 | 2014-04-22 | Trane International Inc. | Ventilation controller |
| CN104633869A (en) * | 2015-03-16 | 2015-05-20 | 珠海格力电器股份有限公司 | Control method and control system for outdoor air conditioning unit |
| CN104838214A (en) * | 2012-10-10 | 2015-08-12 | 特灵国际有限公司 | Variable fan speed control in hvac systems and methods |
| CN106524421A (en) * | 2016-11-28 | 2017-03-22 | 广东美芝制冷设备有限公司 | Air conditioning system |
| CN106595154A (en) * | 2016-10-18 | 2017-04-26 | 珠海格力电器股份有限公司 | Condensing unit operation control method and device and refrigerating equipment comprising device |
-
2017
- 2017-06-23 CN CN201710484400.8A patent/CN107238180B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8702482B2 (en) * | 2004-12-07 | 2014-04-22 | Trane International Inc. | Ventilation controller |
| KR100656164B1 (en) * | 2005-12-21 | 2006-12-13 | 삼성전자주식회사 | Air conditioner and its control method |
| CN104838214A (en) * | 2012-10-10 | 2015-08-12 | 特灵国际有限公司 | Variable fan speed control in hvac systems and methods |
| CN104633869A (en) * | 2015-03-16 | 2015-05-20 | 珠海格力电器股份有限公司 | Control method and control system for outdoor air conditioning unit |
| CN106595154A (en) * | 2016-10-18 | 2017-04-26 | 珠海格力电器股份有限公司 | Condensing unit operation control method and device and refrigerating equipment comprising device |
| CN106524421A (en) * | 2016-11-28 | 2017-03-22 | 广东美芝制冷设备有限公司 | Air conditioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107238180A (en) | 2017-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107238180B (en) | Air quantity control method and system of air-cooled water chilling unit | |
| US10119717B2 (en) | Heat source system, and device and method for controlling cooling water supply device | |
| CN105241017B (en) | The control method for frequency of air-conditioning system and compressor of air conditioner | |
| US10941964B2 (en) | Method for operating a vapour compression system with a receiver | |
| CN107003046B (en) | Method for controlling the valve arrangement in vapor compression system | |
| CN109373497B (en) | Refrigerant quantity adjusting method, device and system of temperature adjusting equipment and air conditioner | |
| US10174986B2 (en) | Heat source machine and control method therefor | |
| CN105371545A (en) | An air conditioner and a refrigerant circulation quantity adjusting method for a refrigeration system thereof | |
| US20080229782A1 (en) | Refrigerating Apparatus | |
| KR100888122B1 (en) | Air conditioning device | |
| US10775086B2 (en) | Method for controlling a vapour compression system in ejector mode for a prolonged time | |
| US10876777B2 (en) | Air conditioning device using vapor injection cycle and method for controlling the device | |
| CN113237203B (en) | Electronic expansion valve control method and related equipment | |
| US11402134B2 (en) | Outdoor unit and control method thereof | |
| CN107024013B (en) | Air conditioner and its control method | |
| CN107388644A (en) | Frequency conversion water cooling cold group and its control method | |
| CN112577172B (en) | Refrigeration control method and device of air conditioning system, storage medium and air conditioning system | |
| US10823474B2 (en) | Perturbation of expansion valve in vapor compression system | |
| CN115200243A (en) | Magnetic suspension cooling unit and control method | |
| CN112628895B (en) | Direct expansion type air conditioning unit and control method thereof | |
| US11920842B2 (en) | Method for controlling a vapour compression system based on estimated flow | |
| CN114857665A (en) | Multi-split system | |
| CN105571027A (en) | Water chilling unit and control method thereof | |
| JP2018179370A (en) | Freezer unit | |
| CN113932466A (en) | Air conditioning unit and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |