CN107806695A - The energy-saving control device and its control method of a kind of air conditioning cooling water system - Google Patents
The energy-saving control device and its control method of a kind of air conditioning cooling water system Download PDFInfo
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- CN107806695A CN107806695A CN201610742012.0A CN201610742012A CN107806695A CN 107806695 A CN107806695 A CN 107806695A CN 201610742012 A CN201610742012 A CN 201610742012A CN 107806695 A CN107806695 A CN 107806695A
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Abstract
The invention discloses a kind of energy-saving control device of air conditioning cooling water system and its control method, comprise the following steps：Peak frequency f during cooling water pump operation is setmaxWith minimum frequency fmin；Obtain cooling water water-in and water-out temperature actual value tw1、tw2, calculate cooling water supply backwater temperature difference actual value Δ tw=tw2‑tw1；Cold in-water temperature fiducial value a, b are set, by tw1Compared with a, b, cooling water supply backwater temperature difference theoretical value Δ t is determinedw0；According to Δ twWith Δ tw0, by standard PID algorithm, obtain the theoretical running frequency f of cooling water pump0；According to theoretical running frequency f0With peak frequency fmaxAnd minimum frequency fminRelation, the actual motion frequency f of cooling water pump is determined, to realize the dynamic control to cooling water pump；Obtain air wet-bulb temperature ts, according to tsCalculate the theoretical value t of cooling tower leaving water temperature0；Compare tw1With t0, by standard PID algorithm, obtain the running frequency f of blower fan of cooling tower0t, to realize the dynamic control to blower fan of cooling tower.
Description
Technical field
The present invention relates to the control device of the apparatus of air conditioning and control method, more particularly to a kind of air conditioning cooling water system
Energy-saving control device and control method.
Background technology
China's building energy consumption accounts for the 1/3 of social total energy consumption, wherein the energy consumption accounting for the regulation and control of air thermal and humidity environment is
Through more than 65%, particularly in peak of power consumption period summer, in air-conditioning, this can to Chinese society economy for about 50% power consumption
Sustainable development brings significant impact.Low-temperature receiver is the chief component of air-conditioning energy consumption, according to statistics, the energy of central air conditioner cold source
Consumption accounts for the 70%-80% of central air-conditioning overall energy consumption.Central air conditioner cold source include cold water main unit, chilled water pump, cooling water pump and
Cooling tower, it provides cold for building.Due to building the cold of demand with the service condition and outside air environment of building
Change and change, therefore, the operation of low-temperature receiver needs to be adjusted with the change of building refrigeration requirement, to reach energy saving in running
Purpose.
At present, the runing adjustment of low-temperature receiver is concentrated mainly on the variable-flow of chilled water pump（Frequency conversion）In regulation, and for cooling
Using less, shaping modes are also relatively single for the regulation of water system, mainly pass in and out water temperature difference using handpiece Water Chilling Units side cooling water
For controlled plant, cooling water is often set into and out of the temperature difference of handpiece Water Chilling Units as a fixed value（Usually it is set in 5 DEG C）, work as temperature
Cooling water pump is adjusted using speed change (frequency conversion) when difference deviates.This shaping modes have been concerned only with the fortune of cooling water pump itself
Row state, and the influence during have ignored chilled water modulation to handpiece Water Chilling Units and cooling tower working condition.In fact, cooling water
The work of pump and the energy consumption of handpiece Water Chilling Units and the working condition of cooling tower are closely related, when cooling water is into and out of the temperature of handpiece Water Chilling Units
Difference it is constant at 5 DEG C, on the one hand, if cooling water enter handpiece Water Chilling Units temperature it is too high when, can cause handpiece Water Chilling Units condensation temperature
Degree rise, the energy consumption increase of unit, on the other hand, when handpiece Water Chilling Units condensation heat reduces, can cause the cooling water outlet and inlet temperature difference
Reduce, cooling water pump flow-reduction, so as to cause the heat transfer effect of handpiece Water Chilling Units condenser to be deteriorated, the energy consumption of handpiece Water Chilling Units is on the contrary
Increase.Meanwhile when the flow if reduced, the irrigation pressure before cooling tower can reduce, and can also cause the work efficiency drop of cooling tower.
Therefore, the regulation of cooling water system should consider the condensation temperature change of handpiece Water Chilling Units and the working condition of cooling tower becomes
Change, determined after carrying out Integrated comparative.
In view of the foregoing, cooling water system normal work can be met by needing one kind badly, and and can realizes the sky of energy-conservation purpose
Adjust the energy-saving control device and control method of cooling water system.
The content of the invention
The technical problem to be solved in the present invention is to provide one kind by working out optimized operation shaping modes, meet that air-conditioning cools down
Water system service requirement, reach the energy-saving control method and energy-saving control device of energy-conservation purpose air conditioning cooling water system again.
In order to solve the above-mentioned technical problem, the invention discloses a kind of energy-saving control method of air conditioning cooling water system, bag
Include following steps：
Step S0：Peak frequency f during cooling water pump operation is setmaxWith minimum frequency fmin；
Step S1：Obtained by inflow temperature detection unit, leaving water temperature detection unit cold on handpiece Water Chilling Units water-in and water-out pipeline
But water water-in and water-out temperature actual value tw1、tw2, calculate cooling water supply backwater temperature difference actual value Δ tw=tw2-tw1；
Step S2：Cold in-water temperature fiducial value a, b be set, and described a, b are constant, and a ＜ b；By handpiece Water Chilling Units cooling water
Inflow temperature parameter tw1Compared with cold in-water temperature fiducial value a, b, obtain and controlled for handpiece Water Chilling Units cooling water pump
Cooling water supply backwater temperature difference theoretical value Δ tw0, compare cooling water supply backwater temperature difference actual value Δ twWith cooling water supply backwater temperature difference
Theoretical value Δ tw0, by standard PID algorithm, obtain the theoretical running frequency f of cooling water pump0；
Step S3：According to the theoretical running frequency f0With peak frequency fmaxAnd minimum frequency fminRelation, determine cooling water
The actual motion frequency f of pump：Work as f0≤fminWhen, take f=fmin；Work as f0≥fmaxWhen, take f=fmax；Work as fmin＜ f0＜ fmax, take f=
f0；F is sent to cooling water pump frequency converter, to realize the dynamic control to cooling water pump；
Step S4：The air wet-bulb temperature t of cooling tower air inlet is obtained by wet-bulb temperature detection units, according to described big
Gas wet-bulb temperature tsCalculate the theoretical value t of cooling tower leaving water temperatureo=ts+Δtt, the Δ ttIt is poor for the cooling cold width of Deethanizer design, i.e.,
The difference of leaving water temperature and local summer air-conditioning design wet-bulb temperature under cooling tower design conditions；
Step S5：Compare handpiece Water Chilling Units cold in-water temperature tw1With the theoretical value t of cooling tower leaving water temperature0, pass through standard PID
Algorithm, determine the running frequency f of blower fan of cooling tower0t, by f0tSend to blower fan of cooling tower frequency converter, to realize to cooling tower wind
The dynamic control of machine.
The energy-saving control method of described air conditioning cooling water system, by the strong detection unit of hydraulic pressure to nozzle for cooling tower before
Water pressure intensity parameter P is monitored on-line, by adjusting the running frequency f of cooling pump, makes P=P0, the P0Will for cooling Deethanizer design
The nozzle spray pressure asked, record maximum frequency of operation fs of the running frequency f now as cooling water pumpmax。
The energy-saving control method of described air conditioning cooling water system, the strong detection unit of described hydraulic pressure pass through installed in cooling
Water pressure transducer before tower water inlet pipe nozzle obtains water pressure intensity parameter P.
The energy-saving control method of described air conditioning cooling water system, the wet-bulb temperature detection unit pass through installed in cooling
The outdoor wet bulb temperature sensor of tower air inlet obtains air wet bulb temperature parameter ts。
The energy-saving control method of described air conditioning cooling water system, the inflow temperature detection unit, leaving water temperature detection
Unit obtains cooling-water machine by the inflow temperature sensor on handpiece Water Chilling Units water-in and water-out pipeline, leaving water temperature sensors
Group cooling water water-in and water-out temperature parameter tw1、tw2。
The energy-saving control method of described air conditioning cooling water system, if tw1≤ a, take Δ tw0=5℃；If a ＜ tw1＜ b, take
Δtw0=4℃；If tw1>=b, take Δ tw0=3℃。
The invention also discloses a kind of energy-saving control device of air conditioning cooling water system, including：Main control unit, with the master
Control the memory cell of unit connection, drive output unit, the strong detection unit of hydraulic pressure, wet-bulb temperature detection unit, inflow temperature inspection
Survey unit and leaving water temperature detection unit.
The memory cell is used to store gathered data, preset data and calculates the data obtained.
The driving output unit connection cooling water pump frequency converter and blower fan of cooling tower frequency converter, the driving output unit
For the instruction according to the main control unit, output control signal is to cooling water pump frequency converter and blower fan of cooling tower frequency converter to control
The running frequency of cooling water pump and blower fan of cooling tower processed.
The strong detection unit connection of hydraulic pressure is arranged on the water pressure transducer before cooling tower water inlet pipe nozzle, for online
Monitor the pressure parameter P before cooling tower water inlet pipe nozzle.
The outdoor wet-bulb temperature detection unit connection is arranged on the outdoor wet bulb temperature sensor of cooling tower air inlet,
For monitoring the outdoor wet-bulb temperature parameter t of cooling tower air inlet on-lines。
The inflow temperature detection unit is arranged on the inflow temperature sensor on handpiece Water Chilling Units inlet channel by connection,
For on-line checking handpiece Water Chilling Units cold in-water temperature parameter tw1。
The leaving water temperature detection unit is arranged on the leaving water temperature sensors on handpiece Water Chilling Units outlet conduit by connection,
For on-line checking handpiece Water Chilling Units cooling water leaving water temperature parameter tw2。
The cooling tower air intake wet-bulb temperature parameter t that the main control unit gathers according to wet bulb temperature sensorsCalculate cold
But the theoretical value t of tower leaving water temperatureo=ts+Δtt, the Δ ttIt is poor for the cooling cold width of Deethanizer design, i.e., under cooling tower design conditions
The difference of leaving water temperature and local summer air-conditioning design wet-bulb temperature.
The handpiece Water Chilling Units cooling water that the main control unit gathers according to the inflow temperature sensor, leaving water temperature sensors
Water-in and water-out temperature tw1、tw2, calculate cooling water supply backwater temperature difference actual value Δ tw=tw2-tw1。
The main control unit is by handpiece Water Chilling Units cold in-water temperature tw1With cold in-water temperature fiducial value a, b of setting
It is compared, determines cooling water supply backwater temperature difference theoretical value Δ tw0；Described a, b are constant, and a ＜ b.
The more described cooling water supply backwater temperature difference theoretical value Δ t of the main control unitw0It is real with cooling water supply backwater temperature difference
Actual value Δ tw, by standard PID algorithm, obtain the theoretical running frequency f of cooling water pump0。
Described main control unit is according to the theoretical running frequency f of the cooling water pump0With the peak frequency f of settingmaxAnd most
Small frequency fminRelation, determine the actual motion frequency f of cooling water pump：Work as f0≤fminWhen, take f=fmin；Work as f0≥fmaxWhen, take
f=fmax；Work as fmin＜ f0＜ fmax, take f=f0；And corresponding cooling water pump Frequency Converter Control is sent to the driving output unit and referred to
Order, to realize the control to cooling water pump.
The main control unit compares handpiece Water Chilling Units cold in-water temperature tw1With the theoretical value t of cooling tower leaving water temperature0, lead to
Standard PID algorithm is crossed, determines the running frequency f of blower fan of cooling tower0t, and corresponding cooling tower is sent to the driving output unit
Fan frequency converter control instruction, to realize the dynamic control to blower fan of cooling tower.
The energy-saving control device of described air conditioning cooling water system, the strong detection unit of the hydraulic pressure, wet-bulb temperature detection are single
AD conversion unit is provided between member, inflow temperature detection unit, leaving water temperature detection unit and the main control unit.
The energy-saving control device of described air conditioning cooling water system, it is provided between the main control unit and the driver element
D/A conversion unit.
The energy-saving control device of described air conditioning cooling water system, in addition to connect with the RS485 that the main control unit is connected
Mouth unit, the RS485 interface units are used for the state and remotely modifying control parameter of remote monitoring energy-saving control device.
The energy-saving control device of described air conditioning cooling water system, in addition to the digital quantity being connected with the main control unit are defeated
Enter unit, digital quantity input block connection monitoring running state device, hand automatic switch and the frequency conversion fault monitoring device,
Blower fan of cooling tower monitoring running state device, blower fan of cooling tower hand automatic switch and blower fan of cooling tower frequency conversion fault monitoring device；
The running state data of the cooling water pump of the monitoring running state device on-line monitoring, the status number of the hand automatic switch
According to, the frequency conversion fault data of the frequency conversion fault monitoring device on-line checking, the blower fan of cooling tower monitoring running state device
The running state data of the blower fan of cooling tower of on-line monitoring, the status data of the blower fan of cooling tower hand automatic switch and described
The blower fan of cooling tower frequency conversion fault data of blower fan of cooling tower frequency conversion fault monitoring device on-line checking is inputted by the digital quantity
Unit sends the main control unit to and then the main control unit is sent corresponding control instruction.
The energy-saving control device of described air conditioning cooling water system, by the strong detection unit of hydraulic pressure to nozzle for cooling tower before
Water pressure intensity parameter P is monitored on-line, by adjusting the running frequency f of cooling pump, makes P=P0, the P0Will for cooling Deethanizer design
The nozzle spray pressure asked, record maximum frequency of operation fs of the running frequency f now as cooling water pumpmax。
The energy-saving control device of described air conditioning cooling water system, it is characterised in that：If tw1≤ a, take Δ tw0=5℃；If a
＜ tw1＜ b, take Δ tw0=4℃；If tw1>=b, take Δ tw0=3℃。
Compared with prior art, energy-saving control device of the invention and its control method have following advantageous effects：
Consider outdoor air wet bulb temperature when controlling cooling water system, cooling tower water inlet pressure, cooling water import and export water temperature,
Rather than simply with the default constant temperature difference（If the constant temperature difference is 5 DEG C）It is controlled.The present invention is by working out optimal operation
Shaping modes, reach and both meet cooling water system service requirement, realize the purpose of energy-conservation again.
Brief description of the drawings
Fig. 1 is the energy-saving control method flow chart of air conditioning cooling water system of the present invention；
Fig. 2 is each sensor mounting location schematic diagram of Energy Saving Control of air conditioning cooling water system of the present invention：
Fig. 3 is the energy-saving control device structural representation of air conditioning cooling water system of the present invention；
Fig. 4 is the main control unit circuit diagram of the energy-saving control device of air conditioning cooling water system of the present invention；
Fig. 5 is the RS485 interface unit circuit diagrams of the energy-saving control device of air conditioning cooling water system of the present invention；
Fig. 6 is six railway digital amount input voltage modulate circuit figures of the energy-saving control device of air conditioning cooling water system of the present invention；
Fig. 7 is the two-way analog output voltage modulate circuit figure of the energy-saving control device of air conditioning cooling water system of the present invention；
Fig. 8 is four road analog input voltage modulate circuit figures of the energy-saving control device of air conditioning cooling water system of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
As shown in figure 1, the energy-saving control method of air conditioning cooling water system of the present invention, comprises the following steps：
Step S0：Peak frequency f during cooling water pump operation is setmaxWith minimum frequency fmin.Preferably, detected by force by hydraulic pressure
Unit 3 detects to the water pressure intensity parameter P before nozzle for cooling tower, by adjusting the running frequency f of cooling pump, makes P=P0, institute
State P0For the nozzle spray pressure of cooling tower design requirement, i.e. overbottom pressure at cooling tower cooling water inlet, P0It is true by cooling tower structure
It is fixed, generally 5mH2O posts；Peak frequency f when the running frequency f of record now is run as cooling water pumpmax；Optionally, such as
Shown in Fig. 2, the strong detection unit 3 of hydraulic pressure is detected cold by the water pressure transducer 31 before cooling tower water inlet pipe nozzle
But the pressure parameter P before tower water inlet pipe nozzle.
Step S1：Obtain the cooling water water-in and water-out actual temperature value t on handpiece Water Chilling Units water-in and water-out pipelinew1、tw2, calculate
Go out cooling water supply backwater temperature difference actual value Δ tw=tw2-tw1；Specifically, by setting water-in and water-out temperature detecting unit 5,6 to obtain
The cooling water water-in and water-out actual temperature value tw1、tw2；Optionally, as shown in Fig. 2 water-in and water-out temperature detecting unit 5,6 passes through
51,61 pairs of handpiece Water Chilling Units cooling waters of water-in and water-out temperature sensor on handpiece Water Chilling Units water-in and water-out pipeline are into and out of water temperature
Spend parameter tw1、tw2Monitored on-line.
Step S2：Cold in-water temperature fiducial value a, b be set, and described a, b are constant, and a ＜ b；Handpiece Water Chilling Units are cold
But water inflow temperature parameter tw1Compared with cold in-water temperature fiducial value a, b, obtain for handpiece Water Chilling Units cooling water pump
The cooling water supply backwater temperature difference theoretical value Δ t of controlw0, compare cooling water supply backwater temperature difference actual value Δ twBackwater is supplied with cooling water
Temperature difference theoretical value Δ tw0, by standard PID algorithm, obtain the theoretical running frequency f of cooling water pump0；Preferably, a=30 are set
DEG C, b=34 DEG C, if tw1≤ a, take Δ tw0=5℃；If a ＜ tw1＜ b, take Δ tw0=4℃；If tw1>=b, take Δ tw0=3℃；Using
The control of standard pid control algorithm changes cooling water pump frequency converter frequency and belongs to general knowledge known in this field, will not be described here.
Step S3：According to the cooling water pump theory running frequency f0With peak frequency fmaxAnd minimum frequency fminPass
System, determine the actual motion frequency f of cooling water pump：Work as f0≤fminWhen, take f=fmin；Work as f0≥fmaxWhen, take f=fmax；Work as fmin＜
f0＜ fmax, take f=f0；F is sent to cooling water pump frequency converter, to realize the dynamic control to cooling water pump.
Step S4：Obtain the air wet-bulb temperature t of cooling tower air inlets, according to the air wet-bulb temperature tsCalculate cold
But the theoretical value t of tower leaving water temperature0=ts+Δtt, Δ ttPoor, i.e., the water outlet under cooling tower design conditions for the cooling cold width of Deethanizer design
The difference of temperature and local summer air-conditioning design wet-bulb temperature, it is relevant with cooling tower performance, typically take 3~4 DEG C；Specifically, pass through
Wet-bulb temperature detection unit 4 is set to gather the wet-bulb temperature parameter t of cooling tower air inlets；Optionally, as shown in Fig. 2 wet bulb
Temperature detecting unit 4 is by the outdoor wet bulb temperature sensor 41 installed in cooling tower air inlet to air wet-bulb temperature tsEnter
Row on-line monitoring.
Step S5：Compare handpiece Water Chilling Units cold in-water temperature tw1With the theoretical value t of cooling tower leaving water temperature0, pass through mark
Quasi- pid algorithm, obtain the running frequency f of blower fan of cooling tower0t, by f0tSend to blower fan of cooling tower frequency converter, to realize to cooling
The dynamic control of tower blower fan.Change blower fan of cooling tower frequency converter frequency is controlled to belong to this area public affairs using standard pid control algorithm
Know general knowledge, will not be described here.
As shown in figure 3, the invention also discloses a kind of energy-saving control device of air conditioning cooling water system, including：Master control list
Member 1, the memory cell 9 being connected with the main control unit 1, driving output unit 7, the strong detection unit 3 of hydraulic pressure, wet-bulb temperature detection
Unit 4, inflow temperature detection unit 5 and leaving water temperature detection unit 6；The circuit diagram of the main control unit 1 is as shown in Figure 4.
The strong connection of detection unit 3 of hydraulic pressure is arranged on the water pressure transducer 31 before cooling tower water inlet pipe nozzle, is used for
Monitor the pressure parameter P before cooling tower water inlet pipe nozzle on-line；Preferably, by adjusting the running frequency f of cooling pump, make P=
P0, P0For the nozzle spray pressure of cooling tower design requirement, i.e. overbottom pressure at cooling tower cooling water inlet, P0By cooling tower structure
It is determined that generally 5mH2O posts；Peak frequency f when the running frequency f of record now is run as cooling water pumpmax。
Outdoor wet bulb temperature sensor of the outdoor connection of wet-bulb temperature detection unit 4 installed in cooling tower air inlet
41, for monitoring the outdoor wet-bulb temperature parameter t of cooling tower air inlet on-lines。
The inflow temperature detection unit 5 is by connecting the inflow temperature sensor being arranged on handpiece Water Chilling Units inlet channel
51, for on-line checking handpiece Water Chilling Units cold in-water temperature parameter tw1。
The leaving water temperature detection unit 6 is by connecting the leaving water temperature sensors being arranged on handpiece Water Chilling Units outlet conduit
61, for on-line checking handpiece Water Chilling Units cooling water leaving water temperature parameter tw2。
The driving output unit 7 connects cooling water pump frequency converter 71 and blower fan of cooling tower frequency converter 72, and the driving is defeated
Go out unit 7 for the instruction according to the main control unit 1, output control signal is to cooling water pump frequency converter 71 and blower fan of cooling tower
Frequency converter 72 is to control the running speed of cooling water pump and blower fan of cooling tower.
The memory cell 9 is used to store gathered data, preset data and calculates the data obtained.The memory cell tool
Body is eeprom memory.
The cooling-water machine that the main control unit 1 gathers according to described inflow temperature sensor 51 and leaving water temperature sensors 61
Group cooling water water-in and water-out temperature tw1、tw2, calculate cooling water supply backwater temperature difference actual value Δ tw。
The main control unit is by handpiece Water Chilling Units cold in-water temperature value tw1With the cold in-water temperature fiducial value of setting
A, b is compared, and determines cooling water supply backwater temperature difference theoretical value Δ tw0；Described a, b are constant, and a ＜ b.Preferably, set a=
30 DEG C, b=34 DEG C, if tw1≤ a, take Δ tw0=5℃；If a ＜ tw1＜ b, take Δ tw0=4℃；If tw1>=b, take Δ tw0=3℃。
The relatively more described cooling water supply backwater temperature difference theoretical value Δ t of the main control unit 1w0It is real with cooling water supply backwater temperature difference
Actual value Δ tw, by standard PID algorithm, obtain the theoretical running frequency f of cooling water pump0。
Peak frequency f when described main control unit 1 is run according to the cooling water pump of settingmaxAnd minimum frequency fmin, sentence
The theoretical running frequency f of disconnected cooling water pump0With peak frequency fmaxAnd minimum frequency fminRelation, determine the reality of cooling water pump
Running frequency f：Work as f0≤fminWhen, take f=fmin；Work as f0≥fmaxWhen, take f=fmax；Work as fmin＜ f0＜ fmax, take f=f0；And to institute
State driving output unit 7 and send corresponding cooling water pump Frequency Converter Control instruction, to realize the dynamic control to cooling water pump.
The cooling tower air intake wet-bulb temperature parameter t that the main control unit 1 gathers according to described wet bulb temperature sensor 41s
Calculate the theoretical value t of cooling tower leaving water temperature0= ts+Δtt, the Δ ttIt is poor for the cooling cold width of Deethanizer design, that is, cool down Deethanizer design
The difference of leaving water temperature and local summer air-conditioning design wet-bulb temperature under operating mode；Compare handpiece Water Chilling Units cold in-water temperature value tw1
With the theoretical value t of cooling tower leaving water temperature0, by standard PID algorithm, obtain the running frequency f of blower fan of cooling tower0t, and to institute
State driving output unit 7 and send corresponding blower fan of cooling tower Frequency Converter Control instruction, to realize the dynamic control to blower fan of cooling tower
System.
The strong detection unit 3 of the hydraulic pressure, wet-bulb temperature detection unit 4, inflow temperature detection unit 5, leaving water temperature detection
AD conversion unit is provided between unit 6 and the main control unit 1, the AD conversion unit is four road analog input electricity
Modulate circuit is pressed, as shown in fig. 6, specially precision is the analog-digital converter of 10.
D/A conversion unit is provided between the main control unit 1 and the driving output unit 7, D/A conversion unit
Delivery outlet exports 0-10V control voltage.D/A conversion unit is two-way analog output voltage modulate circuit, as shown in fig. 7,
It is made up of PWM filter circuits and amplifying circuit, PWM filter circuits are made up of two resistance and two electric capacity, and amplifying circuit is by transporting
Calculate amplifier and NPN triode and two resistance compositions, R5 are used as short-circuit protection.
Energy-saving control device of the present invention also includes the digital quantity input block 8 being connected with the main control unit 1, the numeral
Measure input block 8 and connect cooling water pump monitoring running state device 81, cooling water pump hand automatic switch 82, cooling water pump frequency conversion event
Hinder monitoring device 83, blower fan of cooling tower monitoring running state device 84, blower fan of cooling tower hand automatic switch 85, blower fan of cooling tower to become
Frequency fault monitoring device 86.The cooling water pump motion state monitoring device 81 is used for the operation shape for detecting feedback cooling water pump
State；The blower fan of cooling tower monitoring running state device 84 is used for the running status for detecting feedback blower fan of cooling tower；The cooling
Water pump hand automatic switch 82, blower fan of cooling tower hand automatic switch 85 are used for the state of manually or automatically energy-saving adjusting control device：
When any hand auto state signal of hand automatic switch 82 or 85 is manual, energy-saving control device is stopped, analog quantity frequency
Output voltage is 0；When the hand auto state signal of hand switch 82 and 85 is automatic, energy-saving control device normal work.
When energy-saving control device works, when cooling water pump frequency converter failure monitoring device 83 or blower fan of cooling tower frequency converter failure monitoring dress
When putting 86 and detecting frequency converter failure, energy-saving control device is stopped, and analog quantity frequency output voltage is 0.The digital quantity
Input block 8 is specially six railway digital amount input voltage modulate circuits, is made up of pull-up resistor and filter capacitor, as shown in Figure 8.
The running state data for the cooling water pump that the cooling water pump monitoring running state device 81 is monitored on-line, the cooling water pump hand
The frequency converter failure number of the status data of automatic switch 82, the on-line checking of cooling water pump frequency converter failure monitoring device 83
According to the running state data of the blower fan of cooling tower of, the blower fan of cooling tower monitoring running state device 84 on-line monitoring, described cold
But the status data of tower blower fan hand automatic switch 85 and the on-line checking of blower fan of cooling tower frequency converter failure monitoring device 86
Blower fan of cooling tower frequency converter failure data the main control unit 1 is sent to make by the digital quantity input block 8
State main control unit 1 and send corresponding control instruction.
Energy-saving control device of the present invention also includes the RS485 interface units 2 being connected with the main control unit 1, RS485 interfaces
Unit 2 is used for the state and remotely modifying control parameter of remote monitoring energy-saving control device, as shown in Figure 5.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.That is made within the spirit and principles of the invention any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (13)
1. a kind of energy-saving control method of air conditioning cooling water system, comprises the following steps：
Step S0：Peak frequency f during cooling water pump operation is setmaxWith minimum frequency fmin；
Step S1：Pass through inflow temperature detection unit（5）, leaving water temperature detection unit（6）Obtain handpiece Water Chilling Units water-in and water-out pipeline
On cooling water water-in and water-out temperature actual value tw1、tw2, calculate cooling water supply backwater temperature difference actual value Δ tw=tw2-tw1；
Step S2：Cold in-water temperature fiducial value a, b be set, and described a, b are constant, and a ＜ b；By handpiece Water Chilling Units cooling water
Inflow temperature parameter tw1Compared with cold in-water temperature fiducial value a, b, obtain and controlled for handpiece Water Chilling Units cooling water pump
Cooling water supply backwater temperature difference theoretical value Δ tw0, compare cooling water supply backwater temperature difference actual value Δ twWith cooling water supply backwater temperature difference
Theoretical value Δ tw0, by standard PID algorithm, obtain the theoretical running frequency f of cooling water pump0；
Step S3：According to the theoretical running frequency f0With peak frequency fmaxAnd minimum frequency fminRelation, determine cooling water pump
Actual motion frequency f：Work as f0≤fminWhen, take f=fmin；Work as f0≥fmaxWhen, take f=fmax；Work as fmin＜ f0＜ fmax, take f=f0；
F is sent to cooling water pump frequency converter, to realize the dynamic control to cooling water pump；
Step S4：Pass through wet-bulb temperature detection unit（4）Obtain the air wet-bulb temperature t of cooling tower air inlets, according to described
Air wet-bulb temperature tsCalculate the theoretical value t of cooling tower leaving water temperatureo=ts+Δtt, the Δ ttIt is poor for the cooling cold width of Deethanizer design,
The difference of leaving water temperature and local summer air-conditioning design wet-bulb temperature i.e. under cooling tower design conditions；
Step S5：Compare handpiece Water Chilling Units cold in-water temperature tw1With the theoretical value t of cooling tower leaving water temperature0, pass through standard PID
Algorithm, determine the running frequency f of blower fan of cooling tower0t, by f0tSend to blower fan of cooling tower frequency converter, to realize to cooling tower wind
The dynamic control of machine.
2. the energy-saving control method of air conditioning cooling water system according to claim 1, it is characterised in that：Examined by force by hydraulic pressure
Survey unit（3）Water pressure intensity parameter P before nozzle for cooling tower is monitored on-line, by adjusting the running frequency f of cooling pump, made
P=P0, the P0For the nozzle spray pressure of cooling tower design requirement, running frequency f now is recorded as cooling water pump most
Big running frequency fmax。
3. the energy-saving control method of air conditioning cooling water system according to claim 2, it is characterised in that：Described hydraulic pressure is strong
Detection unit（3）Pass through the water pressure transducer before cooling tower water inlet pipe nozzle（31）Obtain water pressure intensity parameter P.
4. the energy-saving control method of air conditioning cooling water system according to claim 1, it is characterised in that：The wet-bulb temperature
Detection unit（4）Pass through the outdoor wet bulb temperature sensor installed in cooling tower air inlet（41）Obtain air wet-bulb temperature ginseng
Number ts。
5. the energy-saving control method of air conditioning cooling water system according to claim 1, it is characterised in that：The inflow temperature
Detection unit（5）, leaving water temperature detection unit（6）Sensed by the inflow temperature on handpiece Water Chilling Units water-in and water-out pipeline
Device（51）, leaving water temperature sensors（61）Obtain handpiece Water Chilling Units cooling water water-in and water-out temperature parameter tw1、tw2。
6. the energy-saving control method of any one air conditioning cooling water system according to claim 1 to 5, it is characterised in that：If
tw1≤ a, take Δ tw0=5℃；If a ＜ tw1＜ b, take Δ tw0=4℃；If tw1>=b, take Δ tw0=3℃。
7. a kind of energy-saving control device of air conditioning cooling water system, including：Main control unit（1）, with the main control unit（1）Connection
Memory cell（9）, driving output unit（7）, the strong detection unit of hydraulic pressure（3）, wet-bulb temperature detection unit（4）, inflow temperature
Detection unit（5）With leaving water temperature detection unit（6）；
The memory cell（9）For storing gathered data, preset data and calculating the data obtained；
The driving output unit（7）Connect cooling water pump frequency converter（71）With blower fan of cooling tower frequency converter（72）, the driving
Output unit（7）For according to the main control unit（1）Instruction, output control signal gives cooling water pump frequency converter（71）With it is cold
But tower fan frequency converter（72）To control the running frequency of cooling water pump and blower fan of cooling tower；
The strong detection unit of hydraulic pressure（3）Connection is arranged on the water pressure transducer before cooling tower water inlet pipe nozzle（31）, it is used for
Monitor the pressure parameter P before cooling tower water inlet pipe nozzle on-line；
The outdoor wet-bulb temperature detection unit（4）Outdoor wet bulb temperature sensor of the connection installed in cooling tower air inlet
（41）, for monitoring the outdoor wet-bulb temperature parameter t of cooling tower air inlet on-lines；
The inflow temperature detection unit（5）By connecting the inflow temperature sensor being arranged on handpiece Water Chilling Units inlet channel
（51）, for on-line checking handpiece Water Chilling Units cold in-water temperature parameter tw1；
The leaving water temperature detection unit（6）By connecting the leaving water temperature sensors being arranged on handpiece Water Chilling Units outlet conduit
（61）, for on-line checking handpiece Water Chilling Units cooling water leaving water temperature parameter tw2；
The main control unit（1）According to wet bulb temperature sensor（41）The cooling tower air intake wet-bulb temperature parameter t of collectionsCalculate
The theoretical value t of cooling tower leaving water temperatureo=ts+Δtt, the Δ ttIt is poor for the cooling cold width of Deethanizer design, i.e., under cooling tower design conditions
Leaving water temperature and local summer air-conditioning design wet-bulb temperature difference；
The main control unit（1）According to the inflow temperature sensor（51）, leaving water temperature sensors（61）The cooling-water machine of collection
Group cooling water water-in and water-out temperature tw1、tw2, calculate cooling water supply backwater temperature difference actual value Δ tw=tw2-tw1；
The main control unit（1）By handpiece Water Chilling Units cold in-water temperature tw1With cold in-water temperature fiducial value a, b of setting
It is compared, determines cooling water supply backwater temperature difference theoretical value Δ tw0；Described a, b are constant, and a ＜ b；
The main control unit（1）Compare described cooling water supply backwater temperature difference theoretical value Δ tw0It is actual with cooling water supply backwater temperature difference
It is worth Δ tw, by standard PID algorithm, obtain the theoretical running frequency f of cooling water pump0；
Described main control unit（1）According to the theoretical running frequency f of the cooling water pump0With the peak frequency f of settingmaxIt is and minimum
Frequency fminRelation, determine the actual motion frequency f of cooling water pump：Work as f0≤fminWhen, take f=fmin；Work as f0≥fmaxWhen, take f=
fmax；Work as fmin＜ f0＜ fmax, take f=f0；And to the driving output unit（7）Send corresponding cooling water pump frequency converter（71）
Control instruction, to realize the control to cooling water pump；
The main control unit（1）Compare handpiece Water Chilling Units cold in-water temperature tw1With the theoretical value t of cooling tower leaving water temperature0, lead to
Standard PID algorithm is crossed, determines the running frequency f of blower fan of cooling tower0t, and to the driving output unit（7）Send corresponding cold
But tower fan frequency converter（72）Control instruction, to realize the dynamic control to blower fan of cooling tower.
8. the energy-saving control device of air conditioning cooling water system according to claim 7, it is characterised in that：The hydraulic pressure is examined by force
Survey unit（3）, wet-bulb temperature detection unit（4）, inflow temperature detection unit（5）, leaving water temperature detection unit（6）With the master
Control unit（1）Between be provided with AD conversion unit.
9. the energy-saving control device of air conditioning cooling water system according to claim 7, it is characterised in that：The main control unit
（1）With the driver element（7）Between be provided with D/A conversion unit.
10. the energy-saving control device of air conditioning cooling water system according to claim 7, it is characterised in that：Also include and institute
State main control unit（1）The RS485 interface units of connection（2）, the RS485 interface units（2）For remote monitoring Energy Saving Control
The state and remotely modifying control parameter of device.
11. the energy-saving control device of air conditioning cooling water system according to claim 7, it is characterised in that：Also include and institute
State main control unit（1）The digital quantity input block of connection（8）, the digital quantity input block（8）Connect monitoring running state dress
Put（81）, hand automatic switch（82）And frequency conversion fault monitoring device（83）, blower fan of cooling tower monitoring running state device（84）、
Blower fan of cooling tower hand automatic switch（85）And blower fan of cooling tower frequency conversion fault monitoring device（86）；The monitoring running state dress
Put（81）The running state data of the cooling water pump of on-line monitoring, the hand automatic switch（82）Status data, the frequency conversion
Fault monitoring device（83）The frequency conversion fault data of on-line checking, the blower fan of cooling tower monitoring running state device（84）Online
The running state data of the blower fan of cooling tower of monitoring, the blower fan of cooling tower hand automatic switch（85）Status data and described
Blower fan of cooling tower frequency conversion fault monitoring device（86）The blower fan of cooling tower frequency conversion fault data of on-line checking passes through the digital quantity
Input block（8）Send the main control unit to（1）And then make the main control unit（1）Send corresponding control instruction.
12. the energy-saving control device of air conditioning cooling water system according to claim 7, it is characterised in that：It is strong by hydraulic pressure
Detection unit（3）Water pressure intensity parameter P before nozzle for cooling tower is monitored on-line, by adjusting the running frequency f of cooling pump,
Make P=P0, the P0For the nozzle spray pressure of cooling tower design requirement, running frequency f now is recorded as cooling water pump
Maximum frequency of operation fmax。
13. the energy-saving control device of any one air conditioning cooling water system according to claim 7 to 12, it is characterised in that：
If tw1≤ a, take Δ tw0=5℃；If a ＜ tw1＜ b, take Δ tw0=4℃；If tw1>=b, take Δ tw0=3℃。
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| CN109974374A (en) * | 2019-03-26 | 2019-07-05 | 北京百度网讯科技有限公司 | A kind of refrigeration system |
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