CN107664339A - Control method, device and the central air-conditioning of the cooling water pump of central air-conditioning - Google Patents
Control method, device and the central air-conditioning of the cooling water pump of central air-conditioning Download PDFInfo
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- CN107664339A CN107664339A CN201710994539.7A CN201710994539A CN107664339A CN 107664339 A CN107664339 A CN 107664339A CN 201710994539 A CN201710994539 A CN 201710994539A CN 107664339 A CN107664339 A CN 107664339A
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Abstract
The embodiment of the present invention provides a kind of control method, device and the central air-conditioning of the cooling water pump of central air-conditioning, belongs to air-conditioning technical field.The central air-conditioning includes cooling tower, and this method includes：Wet-bulb temperature, the current cooling water return water temperature of the cooling water pump and current cooling water supply temperature outside sensing chamber；Preferable cooling water return water temperature is determined according to the outdoor wet-bulb temperature and cooling tower coefficient；According to the current cooling water return water temperature, current cooling water supply temperature, supply backwater temperature difference predetermined value, temperature deviation permissible value and the preferable cooling water return water temperature, the working frequency of the cooling water pump is controlled.The present invention can allow cooling water pump to meet the emission capacity limitation of cooling tower, be operated in for demand thermal discharge under optimal power save mode.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of control method of the cooling water pump of central air-conditioning, dress
Put and central air-conditioning.
Background technology
Central air conditioner system structure is mainly made up of three parts：Refrigeration host computer, air-conditioner water system and air conditioning duct system.
Refrigeration host computer is the core of whole system, and it provides cold for whole system.The refrigeration principle of general refrigeration host computer
Be compressor the relatively low both vapor compression of pressure into the higher steam of pressure, reduce the volume of steam, pressure rise.Compressor
The working substance steam of the lower pressure from evaporator processing is sucked, condenser is sent into after being allowed to pressure rise, condenses within the condenser
The liquid higher into pressure, after choke valve throttles, after turning into the relatively low liquid of pressure, evaporator is sent into, is inhaled in evaporator
Thermal evaporation forms the relatively low steam of pressure, the entrance of compressor is re-fed into, so as to complete kind of refrigeration cycle.
Air-conditioner water system includes chilled water system and cooling water system.Chilled water system be responsible for refrigeration host computer come out it is cold
Freeze the fan coil progress heat exchange that water is transported to building room, refrigeration host computer system is returned by the chilled water of heat exchange
It is cold.Cooling water system main function be by refrigeration host computer the heat absorption of chilled water one end and be input to cooling tower carry out it is cold
But, the heat of refrigeration host computer absorption refrigerating water one end is returned.
Cooling water system wherein in air-conditioner water system includes chilled(cooling) water return (CWR) and cooling tower loop two parts, and cooling water returns
Lu Zhong, the water supply of condenser are transmitted by water pump, realize the heat exchange of cooling backwater and refrigerant.In cooling tower loop, from condensation
The cooling water that device comes out carries amount of heat, is exchanged heat in cooling tower with surrounding environment, realizes cooling.
Present inventor has found that the such scheme of prior art has following defect during the present invention is realized：It is existing
Have in technology in chilled(cooling) water return (CWR), cooling water pump and blower fan of cooling tower are unable to coordinated operation, and usual cooling water pump is cold in order to meet
But the radiating requirements of tower, operation at maximum frequency, limit more than cooling tower heat-sinking capability, and cooling tower hypervolia evaporates and imitated
Rate is low, and power consumption is larger.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of control method, device and the center of the cooling water pump of central air-conditioning
Air-conditioning, control method, device and the central air-conditioning of the cooling water pump of the central air-conditioning can allow cooling water pump to meet cooling tower
Emission capacity limitation, operated in for demand thermal discharge under optimal power save mode.
To achieve these goals, the embodiment of the present invention provides a kind of control method of the cooling water pump of central air-conditioning, should
Central air-conditioning includes cooling tower, and this method includes：The current cooling water backwater temperature of wet-bulb temperature, the cooling water pump outside sensing chamber
Degree and current cooling water supply temperature；Preferable cooling water backwater temperature is determined according to the outdoor wet-bulb temperature and cooling tower coefficient
Degree；It is inclined according to the current cooling water return water temperature, the current cooling water supply temperature, supply backwater temperature difference predetermined value, temperature
Poor permissible value and the preferable cooling water return water temperature, control the working frequency of the cooling water pump.
Preferably, the preferable cooling water return water temperature is calculated by below equation：T2=(a+1) × T1+ b, wherein, T1
For the outdoor wet-bulb temperature, a and b are the cooling tower coefficient, the T2For the preferable cooling water return water temperature.
Preferably, it is pre- according to the current cooling water return water temperature, the current cooling water supply temperature, supply backwater temperature difference
Definite value, temperature deviation permissible value and the preferable cooling water return water temperature, controlling the working frequency of the cooling water pump includes：
It is determined that the current cooling water return water temperature is more than the preferable cooling water return water temperature and the temperature deviation permissible value
And when, control the cooling water pump to be run with the frequency maxima of the cooling water pump；It is determined that the current cooling water backwater temperature
When degree is less than the difference of the preferable cooling water return water temperature and the temperature deviation permissible value, control the cooling water pump cold with this
But the frequency minima operation of water pump；It is determined that the current cooling water return water temperature is less than or equal to the preferable cooling water backwater
Temperature and the temperature deviation permissible value and, and more than or equal to the preferable cooling water return water temperature and the temperature deviation
During the difference of permissible value, according to the current cooling water return water temperature, current cooling water supply temperature, the supply backwater temperature difference
Predetermined value and the temperature deviation permissible value control the working frequency of the cooling water pump.
Preferably, according to the current cooling water return water temperature, the current cooling water supply temperature, the confession backwater temperature
Poor predetermined value and the temperature deviation permissible value control the working frequency of the cooling water pump to include：It is determined that described current cold
But the difference of water return water temperature and the current cooling water supply temperature is more than the supply backwater temperature difference predetermined value and the temperature is inclined
Poor permissible value and when, increase the frequency of the cooling water pump；It is determined that the current cooling water return water temperature and described current
When the difference of cooling water supply temperature is less than the supply backwater temperature difference predetermined value and the difference of the temperature deviation permissible value, described in reduction
The frequency of cooling water pump；It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature is less than etc.
In the supply backwater temperature difference predetermined value and the temperature deviation permissible value and, and make a reservation for more than or equal to the supply backwater temperature difference
When value and the difference of the temperature deviation permissible value, control the frequency of the cooling water pump constant.
Preferably, this method also includes：Detect the current cooling water circling water flow rate；According to the current cooling water backwater
Flow controls the operation quantity of the cooling water pump.
The embodiment of the present invention also provides a kind of control device of the cooling water pump of central air-conditioning, and the central air-conditioning includes cooling
Tower, the device include：Detection unit, processing unit and control unit, wherein, the detection unit is used for wet bulb temperature outside sensing chamber
Degree, the current cooling water return water temperature of the cooling water pump and current cooling water supply temperature；The processing unit is used for basis
The outdoor wet-bulb temperature and cooling tower coefficient determine preferable cooling water return water temperature；Described control unit is used to be worked as according to described
Preceding cooling water return water temperature, current cooling water supply temperature, supply backwater temperature difference predetermined value, temperature deviation permissible value and the institute
Preferable cooling water return water temperature is stated, controls the working frequency of the cooling water pump.
Preferably, the processing unit is additionally operable to calculate the preferable cooling water return water temperature by below equation：T2=
(a+1)×T1+ b, wherein, T1For the outdoor wet-bulb temperature, a and b are the cooling tower coefficient, the T2It is cold for the ideal
But water return water temperature.
Preferably, described control unit is additionally operable to：It is determined that the current cooling water return water temperature is cold more than the ideal
But water return water temperature and the temperature deviation permissible value and when, control the cooling water pump maximum with the frequency of the cooling water pump
Value operation；It is determined that the current cooling water return water temperature is permitted less than the preferable cooling water return water temperature with the temperature deviation
During the difference being worth perhaps, the cooling water pump is controlled to be run with the frequency minima of the cooling water pump；It is determined that the current cooling water
Return water temperature be less than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value and, and be more than or equal to institute
When stating the difference of preferable cooling water return water temperature and the temperature deviation permissible value, according to the current cooling water return water temperature, institute
State current cooling water supply temperature, the supply backwater temperature difference predetermined value and the temperature deviation permissible value and control the cooling water
The working frequency of pump.
Preferably, it is determined that the current cooling water return water temperature is less than or equal to the preferable cooling water return water temperature and institute
The sum of temperature deviation permissible value is stated, and more than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value
In the case of difference, described control unit is additionally operable to：It is determined that the current cooling water return water temperature and the current cooling water supply
The difference of coolant-temperature gage be more than the supply backwater temperature difference predetermined value and the temperature deviation permissible value and when, increase the cooling water pump
Frequency；It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature supplies backwater less than described
When temperature difference predetermined value and the difference of the temperature deviation permissible value, reduce the frequency of the cooling water pump；It is determined that described current cold
But the difference of water return water temperature and the current cooling water supply temperature is less than or equal to the supply backwater temperature difference predetermined value and the temperature
When spending the sum of deviation allowable value, and being more than or equal to the supply backwater temperature difference predetermined value and the difference of the temperature deviation permissible value,
Control the frequency of the cooling water pump constant.
Preferably, the detection unit is additionally operable to detect the current cooling water circling water flow rate；Described control unit is also used
In the operation quantity that the cooling water pump is controlled according to the current cooling water circling water flow rate.
The embodiment of the present invention also provides a kind of central air-conditioning, the central air-conditioning include cooling water pump, cooling tower and above
The control device of the cooling water pump of described central air-conditioning.
Pass through above-mentioned technical proposal, use control method, the device of the cooling water pump of central air-conditioning provided by the invention with
And central air-conditioning, this method include：Wet-bulb temperature outside sensing chamber, the current cooling water return water temperature of the cooling water pump and current
Cooling water supply temperature；Preferable cooling water return water temperature is determined according to the outdoor wet-bulb temperature and cooling tower coefficient；According to institute
State current cooling water return water temperature, the current cooling water supply temperature, supply backwater temperature difference predetermined value, temperature deviation permissible value with
And the preferable cooling water return water temperature, control the working frequency of the cooling water pump.Demand is determined according to outdoor wet-bulb temperature
Target water temperature, and cooling water pump is run according to demand, allow cooling water pump to meet the emission capacity limitation of cooling tower, for needing
Thermal discharge is asked to operate under optimal power save mode.
The further feature and advantage of the embodiment of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is that the embodiment of the present invention is further understood for providing, and a part for constitution instruction, with
The embodiment in face is used to explain the embodiment of the present invention together, but does not form the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 is the flow chart of the control method of the cooling water pump for the central air-conditioning that one embodiment of the invention provides；
Fig. 2 is the flow chart of the control method of the cooling water pump for the central air-conditioning that another embodiment of the present invention provides；
Fig. 3 is the flow chart of the control method of the cooling water pump for the central air-conditioning that another embodiment of the present invention provides；
Fig. 4 is the flow chart of the control method of the cooling water pump for the central air-conditioning that another embodiment of the present invention provides；
Fig. 5 is the structural representation of the control device of the cooling water pump for the central air-conditioning that one embodiment of the invention provides.
Description of reference numerals
The processing unit of 1 detection unit 2
3 control units.
Embodiment
The embodiment of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this
The embodiment of place description is merely to illustrate and explain the present invention embodiment, is not intended to limit the invention embodiment.
Fig. 1 is the flow chart of the control method of the cooling water pump for the central air-conditioning that one embodiment of the invention provides.Such as Fig. 1 institutes
Show, the central air-conditioning includes cooling tower, and this method includes：The current cooling water of wet-bulb temperature, the cooling water pump outside sensing chamber
Return water temperature and current cooling water supply temperature (step S11)；Reason is determined according to the outdoor wet-bulb temperature and cooling tower coefficient
Think cooling water return water temperature (step S12)；According to the current cooling water return water temperature, the current cooling water supply temperature,
Supply backwater temperature difference predetermined value, temperature deviation permissible value and the preferable cooling water return water temperature, control the cooling water pump
Working frequency (step S13).
In embodiments of the present invention, the equipment for controlling the working frequency of cooling water pump can be frequency converter, be become by changing
The output frequency of frequency device is to change the working frequency of cooling water pump.
The temperature of approaching of cooling tower increases with the reduction of outdoor wet-bulb temperature, and significant linear relationship is presented in both；That is,
It can will approach temperature and be expressed as the function of wet-bulb temperature：Cooling tower approaches temperature=a × wet-bulb temperature+b, wherein a<0, b>0,
A and b is determined by the model of cooling tower, is mainly dissipated matter index impacts by the filler of cooling tower.The control of cooling tower uses cooling tower
Approach temperature control method：Water outlet (cooling water backwater) temperature=wet-bulb temperature+cooling tower of cooling tower approaches temperature.
Therefore in embodiments of the present invention, the preferable cooling water return water temperature can be calculated by below equation：T2=
(a+1)×T1+ b, wherein, T1For the outdoor wet-bulb temperature, a and b are the cooling tower coefficient, the T2It is cold for the ideal
But water return water temperature.
, can be in the hope of under the outdoor wet-bulb temperature after current outdoor wet-bulb temperature is detected by above-mentioned formula
Preferable cooling water return water temperature.Then, according to the current cooling water return water temperature detected and current cooling water supply temperature, pre-
The supply backwater temperature difference predetermined value and temperature deviation permissible value that first set and the preferable cooling water return water temperature that calculates can be with
Adjust the working frequency of cooling water pump.Wherein, temperature deviation permissible value can be the value of very little, such as 1.5 DEG C etc., for backwater temperature
Poor predetermined value can carry out real-time optimization according to system loading situation.
Fig. 2 is the flow chart of the control method of the cooling water pump for the central air-conditioning that another embodiment of the present invention provides.Such as Fig. 2
Shown, this method includes：Wet-bulb temperature, the current cooling water return water temperature of the cooling water pump and current cooling water outside sensing chamber
Supply water temperature (step S21)；Preferable cooling water return water temperature (step is determined according to the outdoor wet-bulb temperature and cooling tower coefficient
S22)；Judge whether the current cooling water return water temperature is permitted more than the preferable cooling water return water temperature with the temperature deviation
Perhaps being worth and (step S23)；It is determined that the current cooling water return water temperature is more than the preferable cooling water return water temperature and institute
State temperature deviation permissible value and when, control the cooling water pump to run (step S24) with the frequency maxima of the cooling water pump；
It is determined that the current cooling water return water temperature is not more than the preferable cooling water return water temperature and the temperature deviation permissible value
And when, judge whether the current cooling water return water temperature is less than the preferable cooling water return water temperature and the temperature deviation
The difference (step S25) of permissible value；It is determined that the current cooling water return water temperature be less than the preferable cooling water return water temperature with
During the difference of the temperature deviation permissible value, the cooling water pump is controlled to run (step with the frequency minima of the cooling water pump
S26)；It is determined that the current cooling water return water temperature is less than or equal to the preferable cooling water return water temperature and the temperature deviation
The sum of permissible value, and more than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value difference when, according to
The current cooling water return water temperature, current cooling water supply temperature, the supply backwater temperature difference predetermined value and the temperature
Spend the working frequency (step S27) that deviation allowable value controls the cooling water pump.
The present embodiment provides a kind of adjustment mode of the working frequency of cooling water pump.In the present embodiment, mainly will detection
Obtained current cooling water return water temperature and following two data are contrasted：First is preferable cooling water return water temperature and temperature
The sum of deviation allowable value；Second is the difference of preferable cooling water return water temperature and temperature deviation permissible value.After contrast, it can go out
Existing three kinds of situations, its be more than preferable cooling water return water temperature and temperature deviation permissible value and when, control cooling water pump is with this
The frequency maxima operation of cooling water pump；When it is less than the difference of preferable cooling water return water temperature and temperature deviation permissible value, control
Cooling water pump processed is run with the frequency minima of the cooling water pump；It is less than or equal to preferable cooling water return water temperature at it and temperature is inclined
The sum of poor permissible value, and more than or equal to preferable cooling water return water temperature and temperature deviation permissible value difference when, cooling water pump
Working frequency can linearly change with cooling water return water temperature, can consider current cooling water backwater temperature in the present invention
Degree, current cooling water supply temperature, supply backwater temperature difference predetermined value and temperature deviation permissible value control the cooling water pump
Working frequency, it is specific as follows text described in.
Fig. 3 is the flow chart of the control method of the cooling water pump for the central air-conditioning that another embodiment of the present invention provides.Such as Fig. 3
It is shown, it is determined that the current cooling water return water temperature is less than or equal to the preferable cooling water return water temperature and the temperature deviation
The sum of permissible value, and more than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value difference when, the party
Method also includes：Judge whether the current cooling water return water temperature and the difference of the current cooling water supply temperature are more than the confession
Backwater temperature difference predetermined value and the temperature deviation permissible value and (step S31)；It is determined that the current cooling water return water temperature
With the difference of the current cooling water supply temperature be more than the supply backwater temperature difference predetermined value and the temperature deviation permissible value and
When, increase the frequency (step S32) of the cooling water pump；It is determined that the current cooling water return water temperature and the current cooling
The difference of water supply water temperature no more than the supply backwater temperature difference predetermined value and the temperature deviation permissible value and when, judge described work as
Whether the difference of preceding cooling water return water temperature and the current cooling water supply temperature is less than the supply backwater temperature difference predetermined value and institute
State the difference (step S33) of temperature deviation permissible value；It is determined that the current cooling water return water temperature and the current cooling water supply
When the difference of coolant-temperature gage is less than the supply backwater temperature difference predetermined value and the difference of the temperature deviation permissible value, reduce the cooling water pump
Frequency (step S34)；It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature is less than
Equal to the supply backwater temperature difference predetermined value and the temperature deviation permissible value and, and it is pre- to be more than or equal to the supply backwater temperature difference
When definite value and the difference of the temperature deviation permissible value, control the frequency of the cooling water pump constant (step S35).
The present embodiment provide referred in above-described embodiment be less than or equal to preferable cooling water in current cooling water return water temperature
Return water temperature and temperature deviation permissible value and, and more than or equal to preferable cooling water return water temperature and temperature deviation permissible value
In the case of difference, the mode of the working frequency of cooling water pump is adjusted.
In the present embodiment, mainly by the poor with following two of current cooling water return water temperature and current cooling water supply temperature
Individual data are contrasted：First be supply backwater temperature difference predetermined value with temperature deviation permissible value and；Second is that supply backwater temperature difference is pre-
Definite value and the difference of temperature deviation permissible value.It is more than supply backwater temperature difference predetermined value and temperature deviation permissible value and when, increase
The frequency of cooling water pump；When it is less than supply backwater temperature difference predetermined value and the difference of temperature deviation permissible value, reduce cooling water pump
Frequency；It is less than or equal to the supply backwater temperature difference predetermined value and the temperature deviation permissible value and, and be more than or equal to institute
When stating supply backwater temperature difference predetermined value and the difference of the temperature deviation permissible value, control the frequency of cooling water pump constant, and continue to supervise
Survey.
Fig. 4 is the flow chart of the control method of the cooling water pump for the central air-conditioning that another embodiment of the present invention provides.Such as Fig. 4
Shown, this method also includes：Detect the current cooling water circling water flow rate (step S41)；According to the current cooling water backwater
Flow controls the operation quantity (step S42) of the cooling water pump.
In the present embodiment, there is provided the scheme of control cooling water pump quantity.The operation quantity of cooling water pump and current cooling
Water circling water flow rate is relevant.Cooling water circling water flow rate is bigger, and the operation quantity of cooling water pump is more, and cooling water circling water flow rate is smaller,
The operation quantity of cooling water pump is fewer.The scheme of the control cooling water pump quantity of the present embodiment can be with controlling in above-described embodiment
The scheme of the working frequency of cooling water pump is used together.
Fig. 5 is the structural representation of the control device of the cooling water pump for the central air-conditioning that one embodiment of the invention provides.Such as
Shown in Fig. 5, the central air-conditioning includes cooling tower, and the device includes：Detection unit 1, processing unit 2 and control unit 3, wherein,
The detection unit 1 is used for wet-bulb temperature outside sensing chamber, the current cooling water return water temperature of the cooling water pump and current cooling
Water supply water temperature；The processing unit 2 is used to determine that preferable cooling water returns according to the outdoor wet-bulb temperature and cooling tower coefficient
Coolant-temperature gage；Described control unit 3 is used for according to the current cooling water return water temperature, the current cooling water supply temperature, supplied
Backwater temperature difference predetermined value, temperature deviation permissible value and the preferable cooling water return water temperature, control the work of the cooling water pump
Working frequency.
Preferably, the processing unit 2 is additionally operable to calculate the preferable cooling water return water temperature by below equation：T2=
(a+1)×T1+ b, wherein, T1For the outdoor wet-bulb temperature, a and b are the cooling tower coefficient, the T2It is cold for the ideal
But water return water temperature.
Preferably, described control unit 3 is additionally operable to：It is determined that the current cooling water return water temperature is cold more than the ideal
But water return water temperature and the temperature deviation permissible value and when, control the cooling water pump maximum with the frequency of the cooling water pump
Value operation；It is determined that the current cooling water return water temperature is permitted less than the preferable cooling water return water temperature with the temperature deviation
During the difference being worth perhaps, the cooling water pump is controlled to be run with the frequency minima of the cooling water pump；It is determined that the current cooling water
Return water temperature be less than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value and, and be more than or equal to institute
When stating the difference of preferable cooling water return water temperature and the temperature deviation permissible value, according to the current cooling water return water temperature, institute
State current cooling water supply temperature, the supply backwater temperature difference predetermined value and the temperature deviation permissible value and control the cooling water
The working frequency of pump.
Preferably, it is determined that the current cooling water return water temperature is less than or equal to the preferable cooling water return water temperature and institute
The sum of temperature deviation permissible value is stated, and more than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value
In the case of difference, described control unit 3 is additionally operable to：It is determined that the current cooling water return water temperature and the current cooling water supply
The difference of coolant-temperature gage be more than the supply backwater temperature difference predetermined value and the temperature deviation permissible value and when, increase the cooling water pump
Frequency；It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature supplies backwater less than described
When temperature difference predetermined value and the difference of the temperature deviation permissible value, reduce the frequency of the cooling water pump；It is determined that described current cold
But the difference of water return water temperature and the current cooling water supply temperature is less than or equal to the supply backwater temperature difference predetermined value and the temperature
When spending the sum of deviation allowable value, and being more than or equal to the supply backwater temperature difference predetermined value and the difference of the temperature deviation permissible value,
Control the frequency of the cooling water pump constant.
Preferably, the detection unit 1 is additionally operable to detect the current cooling water circling water flow rate；Described control unit 3 is also
For controlling the operation quantity of the cooling water pump according to the current cooling water circling water flow rate.
The embodiment of the present invention also provides a kind of central air-conditioning, the central air-conditioning include cooling water pump, cooling tower and above
The control device of the cooling water pump of described central air-conditioning.
Pass through above-mentioned technical proposal, use control method, the device of the cooling water pump of central air-conditioning provided by the invention with
And central air-conditioning, the target water temperature of demand is determined according to outdoor wet-bulb temperature, and cooling water pump is run according to demand, allow cooling
Water pump meets the emission capacity limitation of cooling tower, is operated in for demand thermal discharge under optimal power save mode.
The optional embodiment of the embodiment of the present invention is described in detail above in association with accompanying drawing, still, the embodiment of the present invention is simultaneously
The detail being not limited in above-mentioned embodiment, can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical scheme for applying example carries out a variety of simple variants, and these simple variants belong to the protection domain of the embodiment of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the embodiment of the present invention pair
Various combinations of possible ways no longer separately illustrate.
It will be appreciated by those skilled in the art that realize that all or part of step in above-described embodiment method is to pass through
Program instructs the hardware of correlation to complete, and the program storage is in the storage medium, including some instructions are causing list
Piece machine, chip or processor (processor) perform all or part of step of each embodiment methods described of the application.It is and preceding
The storage medium stated includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), random access memory
(RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
In addition, it can also be combined between a variety of embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is run counter to, it should equally be considered as disclosure of that of the embodiment of the present invention.
Claims (11)
1. a kind of control method of the cooling water pump of central air-conditioning, it is characterised in that the central air-conditioning includes cooling tower, this method
Including：
Wet-bulb temperature, the current cooling water return water temperature of the cooling water pump and current cooling water supply temperature outside sensing chamber；
Preferable cooling water return water temperature is determined according to the outdoor wet-bulb temperature and cooling tower coefficient；
It is inclined according to the current cooling water return water temperature, the current cooling water supply temperature, supply backwater temperature difference predetermined value, temperature
Poor permissible value and the preferable cooling water return water temperature, control the working frequency of the cooling water pump.
2. the control method of the cooling water pump of central air-conditioning according to claim 1, it is characterised in that the preferable cooling
Water return water temperature is calculated by below equation：
T2=(a+1) × T1+ b, wherein, T1For the outdoor wet-bulb temperature, a and b are the cooling tower coefficient, the T2To be described
Preferable cooling water return water temperature.
3. the control method of the cooling water pump of central air-conditioning according to claim 1, it is characterised in that according to described current
Cooling water return water temperature, the current cooling water supply temperature, supply backwater temperature difference predetermined value, temperature deviation permissible value and described
Preferable cooling water return water temperature, controlling the working frequency of the cooling water pump includes：
It is determined that the current cooling water return water temperature is more than the preferable cooling water return water temperature and the temperature deviation and allowed
Value and when, control the cooling water pump to be run with the frequency maxima of the cooling water pump；
It is determined that the current cooling water return water temperature is less than the preferable cooling water return water temperature and the temperature deviation and allowed
During the difference of value, the cooling water pump is controlled to be run with the frequency minima of the cooling water pump；
It is determined that the current cooling water return water temperature is less than or equal to the preferable cooling water return water temperature and the temperature deviation
The sum of permissible value, and more than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value difference when, according to
The current cooling water return water temperature, current cooling water supply temperature, the supply backwater temperature difference predetermined value and the temperature
Spend the working frequency that deviation allowable value controls the cooling water pump.
4. the control method of the cooling water pump of central air-conditioning according to claim 3, it is characterised in that according to described current
Cooling water return water temperature, current cooling water supply temperature, the supply backwater temperature difference predetermined value and the temperature deviation are permitted
Perhaps value controls the working frequency of the cooling water pump to include：
It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature supplies backwater temperature more than described
Poor predetermined value and the temperature deviation permissible value and when, increase the frequency of the cooling water pump；
It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature supplies backwater temperature less than described
When poor predetermined value and the difference of the temperature deviation permissible value, reduce the frequency of the cooling water pump；
It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature is less than or equal to described supply back
Water temperature difference predetermined value and the temperature deviation permissible value and, and more than or equal to the supply backwater temperature difference predetermined value and the temperature
When spending the difference of deviation allowable value, control the frequency of the cooling water pump constant.
5. the control method of the cooling water pump of central air-conditioning according to claim 1, it is characterised in that this method is also wrapped
Include：
Detect the current cooling water circling water flow rate；
The operation quantity of the cooling water pump is controlled according to the current cooling water circling water flow rate.
6. a kind of control device of the cooling water pump of central air-conditioning, it is characterised in that the central air-conditioning includes cooling tower, the device
Including：
Detection unit, processing unit and control unit, wherein,
The detection unit is used for the outer wet-bulb temperature of sensing chamber, the current cooling water return water temperature of the cooling water pump and currently cold
But water supply water temperature；
The processing unit is used to determine preferable cooling water return water temperature according to the outdoor wet-bulb temperature and cooling tower coefficient；
Described control unit is used for according to the current cooling water return water temperature, the current cooling water supply temperature, for backwater
Temperature difference predetermined value, temperature deviation permissible value and the preferable cooling water return water temperature, control the work frequency of the cooling water pump
Rate.
7. the control device of the cooling water pump of central air-conditioning according to claim 6, it is characterised in that the processing unit
It is additionally operable to calculate the preferable cooling water return water temperature by below equation：
T2=(a+1) × T1+ b, wherein, T1For the outdoor wet-bulb temperature, a and b are the cooling tower coefficient, the T2To be described
Preferable cooling water return water temperature.
8. the control device of the cooling water pump of central air-conditioning according to claim 6, it is characterised in that described control unit
It is additionally operable to：
It is determined that the current cooling water return water temperature is more than the preferable cooling water return water temperature and the temperature deviation and allowed
Value and when, control the cooling water pump to be run with the frequency maxima of the cooling water pump；
It is determined that the current cooling water return water temperature is less than the preferable cooling water return water temperature and the temperature deviation and allowed
During the difference of value, the cooling water pump is controlled to be run with the frequency minima of the cooling water pump；
It is determined that the current cooling water return water temperature is less than or equal to the preferable cooling water return water temperature and the temperature deviation
The sum of permissible value, and more than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value difference when, according to
The current cooling water return water temperature, current cooling water supply temperature, the supply backwater temperature difference predetermined value and the temperature
Spend the working frequency that deviation allowable value controls the cooling water pump.
9. the control device of the cooling water pump of central air-conditioning according to claim 8, it is characterised in that it is determined that described work as
Preceding cooling water return water temperature be less than or equal to the preferable cooling water return water temperature and the temperature deviation permissible value and, and greatly
In the case of equal to the difference of the preferable cooling water return water temperature and the temperature deviation permissible value, described control unit is also used
In：
It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature supplies backwater temperature more than described
Poor predetermined value and the temperature deviation permissible value and when, increase the frequency of the cooling water pump；
It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature supplies backwater temperature less than described
When poor predetermined value and the difference of the temperature deviation permissible value, reduce the frequency of the cooling water pump；
It is determined that the difference of the current cooling water return water temperature and the current cooling water supply temperature is less than or equal to described supply back
Water temperature difference predetermined value and the temperature deviation permissible value and, and more than or equal to the supply backwater temperature difference predetermined value and the temperature
When spending the difference of deviation allowable value, control the frequency of the cooling water pump constant.
10. the control device of the cooling water pump of central air-conditioning according to claim 6, it is characterised in that
The detection unit is additionally operable to detect the current cooling water circling water flow rate；
Described control unit is additionally operable to control the operation quantity of the cooling water pump according to the current cooling water circling water flow rate.
11. a kind of central air-conditioning, it is characterised in that the central air-conditioning includes cooling water pump, cooling tower and claim 6-10
The control device of the cooling water pump of central air-conditioning described in middle any one claim.
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