CN102455093A - Energy efficiency controlling method for refrigerating system - Google Patents
Energy efficiency controlling method for refrigerating system Download PDFInfo
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- CN102455093A CN102455093A CN2011102359299A CN201110235929A CN102455093A CN 102455093 A CN102455093 A CN 102455093A CN 2011102359299 A CN2011102359299 A CN 2011102359299A CN 201110235929 A CN201110235929 A CN 201110235929A CN 102455093 A CN102455093 A CN 102455093A
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Abstract
The invention discloses an energy efficiency controlling method for a refrigerating system. The method comprises the following steps of: initializing the refrigerating system, and starting an automatic analysis operation mode according to the preset interval time; acquiring the operating parameter of each refrigerating host in real time, calculating the operating parameter when the energy efficiency of each refrigerating host or a cooling tower is optimal, and displaying the optimal value of the operating parameter on a monitoring interface of a work station; controlling a controller to regulate the operating parameter according to the optimal value by the work station, so that the energy efficiency of each refrigerating host is optimal; controlling the refrigerating system by a one-by-one increment/ reduction method, so that the energy efficiency of the refrigerating system is highest; and maintaining the optimal value of the operating parameter to operate the refrigerating system, and closing the automatic analysis operation mode till the next automatic analysis operation mode is started. By the method, automatic regulation of the energy efficiency of the refrigerating system and group control of a refrigerating unit can be realized.
Description
Technical field
A kind of efficiency control method of the present invention relates in particular to the efficiency control method that is applied to refrigeration system.
Background technology
Structural heat sink equipment existing or that be about to design comprises refrigeration unit and heat pump etc.; Because what these Cooling and Heat Source equipment manufacturers considered all is that the unified of equipment uses in certain environment; Refrigeration host computer has the best efficiency point of equipment design in certain state point work; But the designer does not understand comprehensive situation of building operation in depth; On-the-spot installation and every building are used the characteristics that himself is arranged again, and the thermic load of building is constantly to change with indoor thermic load and outdoor environment, so how to make identical cold source equipment meet the characteristics operation separately of difference building; Being the thing of a contradiction, also is the waste energy part and the energy savings technical issues that need to address of current these Cooling and Heat Source equipment.Simultaneously during many refrigeration host computer cooperations, how the console number with set coefficient of refrigerating performance the moment efficiency of system be at the highest notch, current control system had not both had computational methods not have efficiency to show yet.
In addition; The running status that existing refrigeration unit control of installing all is fixed setting control and refrigeration host computer shows; System loading is too high or too low also can only to be relied on operating personnel and judges and increase that unit puts into operation or out of service; Not according to the increase and decrease start and stop operation of cooling load efficiency computing dynamic adjustments refrigeration parameter and robot brain group, possibly cause many refrigeration unit operational efficiency to depart from the situation of peak and the frequent increase and decrease of appearance unit operation.
Summary of the invention
The technical problem that the present invention will solve is, to the prior art moderate defect, provides a kind of and can realize that the refrigeration system efficiency is regulated automatically and the refrigeration system efficiency control method of refrigeration unit team control.
The technical solution adopted for the present invention to solve the technical problems is: a kind of refrigeration system efficiency control method is provided; Said refrigeration system comprises work station and Duo Tai refrigeration host computer; Said refrigeration host computer is connected with cooling tower, cooling water pump, chilled water pump and is used to control the controller of its operational factor, said method comprising the steps of:
S0, refrigeration system initialization are opened analysis operational mode automatically according to preset interval time;
S1, gather the said operational factor of every refrigeration host computer and calculate every refrigeration host computer or the said operational factor of cooling tower efficiency when optimum in real time, on the work station monitoring interface, show the optimal value of said operational factor; Work station is controlled said controller according to this optimal value and is regulated said operational factor and make every refrigeration host computer efficiency optimum;
S2, through making its efficiency the highest by platform increase and decrease method control refrigeration system;
S3, the optimal value of keeping said operational factor are moved said refrigeration system, close automatic analysis operational mode, open up to analyze operational mode automatically next time, return S1.
Be provided with in advance in the workstation1 of said refrigeration system and open the blanking time of analyzing operational mode automatically; Said blanking time of every mistake; Automatically it is optimum to analyze automatic unlatching of operational mode and control efficiency, and system closing is analyzed operational mode automatically, the operational factor that system held is current; Up to next blanking time, analyze automatic unlatching of operational mode automatically and also carry out efficiency control again.The length of blanking time can be according to the actual conditions of refrigeration system building of living in or according to user's self requirements set.This method not only helps the optimum realization of system energy efficiency, also can avoid the waste of the energy better.
In refrigeration system efficiency control method of the present invention, the control of the efficiency of refrigeration host computer also comprises the operational factor or the efficiency control of cooling tower, cooling water pump, chilled water pump among the said step S1;
The said operational factor that said monitoring interface shows comprises efficient and the compressor efficiency and the refrigerating efficiency COP of condensation of refrigerant pressure in chilled water leaving water temperature, the cooling water pump, cooling tower leaving water temperature and thermal discharge efficiency, every refrigeration host computer; Said monitoring interface also shows the efficiency curve of every refrigeration host computer.
In refrigeration system efficiency control method of the present invention, separate unit refrigeration host computer compressor efficiency control method may further comprise the steps:
A1, calculating compressor work and efficient,
Compressor work W
C, n=n/ (n-1) R
g* T
IN[(P
EX/ P
IN)
N-1/n-1] * Q/v
1* C%, wherein T
IN, P
IN, P
EX, be suction temperature, the pressure of inspiration(Pi) of refrigerant in the refrigeration host computer, pressure at expulsion, v
1Be refrigerant suction temperature T
INSpecific volume, Q is total inspiratory capacity of refrigeration host computer, C% is the energy level of refrigeration host computer compressor, R
gBe the gas constant of refrigerant, n is the polytropic exponent of refrigerant;
Efficiency eta=the W of compressor
C, n/ KW.h, wherein KW.h is the power consumption of refrigeration host computer motor;
A2, through controller set and control chilled water leaving water temperature in a scope, the chilled water return water temperature is a fixed value; Utilize the refrigeration host computer controller built-in suffer from one's own actions the maximum algorithm, find out the efficiency eta maximum of compressor through regulating the chilled water leaving water temperature, obtain the chilled water leaving water temperature of this moment, said chilled water leaving water temperature should be higher than the lower limit of said scope;
A3, to regulate the actual chilled water leaving water temperature of control identical with the value of obtaining, and transfer to work station and be presented on the monitoring interface;
The refrigerating efficiency COP of A4, calculating and demonstration refrigeration host computer, COP=Q/KW.h, wherein KW.h is the power consumption of refrigeration host computer motor, Q is the refrigerating capacity of refrigeration host computer (4);
The refrigerating capacity Q=C* Δ T of refrigeration host computer
1* FL
1, FL
1Be chilled-water flow, Δ T
1For chilled water goes out backwater temperature difference, C is the specific heat of water constant;
In refrigeration system efficiency control method of the present invention, the moment optimum flow control method of separate unit cooling water pump may further comprise the steps:
B1, calculating cold-producing medium saturation temperature T
Sa=T
Ci+ Δ T
Cd, T wherein
CiBe cooling water pump return water temperature, Δ T
CdBe the heat-transfer effect temperature approach, heat-transfer effect temperature approach Δ T
CdBe fixed value;
B2, with reference to cold-producing medium saturation temperature and pressure corresponding tables, draw the corresponding condensing pressure P of cold-producing medium
Th
B3, the controller through refrigeration host computer are with actual pressure P
CdWith the condensing pressure P in the corresponding tables
ThThe control cooling water pump is regulated in contrast, makes P
CdWith P
ThIdentical, this moment, the flow of cooling water pump was an optimum flow, and transferred to work station and be presented on the monitoring interface.
In refrigeration system efficiency control method of the present invention, cooling tower leaving water temperature and efficiency control method may further comprise the steps:
The heat exhaust Q of C1, calculating cooling tower
2=C* Δ T
2* FL
2, FL wherein
2Be cooling tower water flow, Δ T
2For cooling tower goes out backwater temperature difference, C is a specific heat of water constant number;
C2, thermal discharge efficiency COP
2=Q
2/ KW.h
2, wherein KW.h is the power consumption of cooling tower, Q is the heat exhaust of cooling tower; Utilize said controller built-in suffer from one's own actions the maximum thermal discharge efficiency that the maximum algorithm is confirmed cooling tower, the cooling tower that obtains this moment goes out backwater temperature difference Δ T
2
The cooling tower leaving water temperature T of C3, calculating optimum
EXT=T
Wet+ Δ T
2, wherein said operational factor comprises that cooling tower goes out backwater temperature difference Δ T
2With extraneous wet-bulb temperature T
Wet, utilize said controller to regulate control cooling tower leaving water temperature, this moment, the cooling tower leaving water temperature reached optimum value, and transferred to work station and be presented on the monitoring interface.
In refrigeration system efficiency control method of the present invention, step S1 also comprises the control and regulation and the demonstration of chilled water water flow.
In refrigeration system efficiency control method of the present invention, step S2 comprises step by step following:
S21, said refrigeration host computer chilled water return water temperature are provided with fixed value, a leaving water temperature and are provided with a scope; Said refrigeration host computer compressor efficiency and load factor are provided with higher limit, and work station reads the higher limit of said chilled water return water temperature, leaving water temperature scope and compressor efficiency and load;
S22, when the chilled water return water temperature greater than setting value, and the compressor efficiency of the refrigeration host computer of having opened and load factor increase a refrigeration host computer input during all more than or equal to its higher limit; When chilled water return water temperature during less than said setting value; Adopt the N-1 algorithm; The overall refrigerating effect that is about to reduce the refrigeration system of a main frame is assigned on the N-1 platform refrigeration host computer, if the leaving water temperature of the chilled water that calculates is higher than the lower limit temperature of the scope of setting, then reduces refrigeration host computer of operation;
If S23 refrigeration host computer operation number changes, returning step S1, to regulate every refrigeration host computer efficiency the highest, controls N+1 then or N-1 platform refrigeration host computer efficiency is the highest.
In refrigeration system efficiency control method of the present invention, step S0 also comprises the indoor thermic load that calculating is current, with the refrigeration host computer platform number and the several on the same stage mutually refrigeration host computer of unlatching of preliminary definite operation.
In refrigeration system efficiency control method of the present invention, it is characterized in that said work station is controlled said controller and regulated said operational factor,, the built-in algorithm routine that is used to control refrigeration system efficiency control method of said work station.
Beneficial effect of the present invention is: refrigeration system efficiency control method of the present invention has changed the fixedly method of operation of refrigeration host computer, realizes that refrigeration train can the flexible adaptation building change operation; The control refrigeration host computer is in the best efficiency point operation and the team control in the relative moment all the time and efficiently matees operation.
Refrigeration system efficiency control method of the present invention has solved the problem that cooling tower cooling effect difference maybe can't be judged cooling effectiveness; There has been clear and definite parameter to instruct cooling water pump, chilled water pump traffic demand, solved cooling water pump and chilled water pump variable flow and reduced the refrigeration problem.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the structural representation according to the refrigeration system of the embodiment of the invention;
Fig. 2 is the structural representation according to separate unit refrigeration host computer in the refrigeration system of the embodiment of the invention;
Fig. 3 is the structural representation according to cooling tower in the refrigeration system of the embodiment of the invention;
Fig. 4 is the flow chart of refrigeration system efficiency control method of the present invention;
Fig. 5 is the flow chart of separate unit refrigeration host computer efficiency control in the refrigeration system efficiency control method of the present invention.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with Fig. 1-5 and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Shown in Fig. 1-3, the present invention forms network through router with workstation1, communication module 2, refrigeration unit and total chilled water pipe; Work station is provided with server 12, and all information analyses of gathering are handled, and realizes the team control to high energy efficiency point of moment of many refrigeration unit cooperations.
Be connected with communication module 2 between refrigeration unit and the workstation1, communication module 2 is connected with wired or wireless communication with the server 12 of workstation1 and the controller 3 of refrigeration unit; Refrigeration unit comprises some refrigeration host computers 4.Can know that in conjunction with Fig. 2 every refrigeration host computer 4 comprises compressor 41, condenser 42, electric expansion valve 43 and the evaporimeter 44 that is in turn connected to form a circulation, form one " heat absorption evaporation, compression, condensation, expansion step-down " refrigeration system of circulation repeatedly.
Refrigeration system also comprises cooling water pump 51, chilled water pump 52 and the cooling tower 6 of auxiliary cooling main frame water circular flow.Chilled water pump 52 is connected with evaporimeter 44, and evaporimeter 44 is drawn the heat that process produces in chilled water pump 52 refrigeration; Cooling water pump 51 is connected with condenser 42, and cooling water pump 51 provides cooling water that the vapours in the condenser 42 is cooled off.Cooling tower 6 connects condensers, and the cooling water of heat in the absorptive condenser is cooled off.
The inlet and outlet pipe lines of cooling water pump 51, chilled water pump 52 or cooling tower 6, turnover feed channel are provided with temperature sensor 7, flowmeter 10, pressure sensor 8; Be provided with motor on refrigeration host computer 4 or the cooling tower 6, motor is provided with frequency converter 11 (the frequency converter english abbreviation is VFD) and power meter.Operational factor so that upper sensor or electric energy metering machine etc. collects passes to workstation1 through communication module 2, feeds back to refrigeration host computer 4 or cooling tower 6 after the workstation1 analytical calculation, and the operational factor after the calculating is on the last monitoring interface that is presented at work station.Near the cooling tower 6 outdoor environment is provided with Temperature Humidity Sensor 9, is used to obtain extraneous wet-bulb temperature.
Refrigeration system also comprises the controller 3 that is respectively applied for control refrigeration host computer 4, cooling tower 6, cooling water pump 51 or chilled water pump 52, and controller 3 is accepted the instruction of workstation1 refrigeration host computer 4, cooling tower 6, cooling water pump 51 or chilled water pump 52 are controlled.Present embodiment comprises some controllers 3, and every refrigeration host computer 4 is by 3 controls of a controller, and per three cooling towers 6 are by 3 controls of a controller, and per three cooling water pumps 51 are by 3 controls of a controller, and per three chilled water pumps 52 are by 3 controls of a controller.The controller 3 that present embodiment adopts is kind ability 3e
SM-T11 controller, and the application of the selection of controller kind and quantity can select and change according to user's demand, is not limited to the scheme of present embodiment.
Be provided with the efficiency algorithm routine that is used to control the refrigeration system efficiency in the server 12 of workstation1, comprise that refrigeration host computer 4 compressors suffer from one's own actions constantly high energy efficiency point algorithm, cooling tower 6 group control algorithm of the high energy efficiency point of best leaving water temperature algorithm, 51 moment of cooling water pump optimum flow algorithm and refrigeration unit sharing of load convergence constantly.
Be provided with in said controller 3 and the server 12 and suffer from one's own actions the maximum algorithm, this algorithm is at first set a parameter area and an a reference value, and the parameter of collection is if be chosen at and then carry out next step computing in this parameter area, otherwise throws aside this parameter; Parameter and this a reference value of gathering are compared, keep bigger value as new a reference value; Gather repeatedly and carry out recycle ratio, up to drawing maximum.
As shown in Figure 4, refrigeration system efficiency control method may further comprise the steps:
S0, refrigeration system initialization are according to opening automatic analysis operational mode between preset interval time;
S1, gather the said operational factor of every refrigeration host computer 4 and calculate every refrigeration host computer 4 or the said operational factor of cooling tower 6 efficiencies when optimum in real time, on the workstation1 monitoring interface, show the optimal value of said operational factor; Workstation1 is controlled the said operational factor of said controller 3 adjustings according to this optimal value makes every refrigeration host computer 4 efficiencies optimum;
S2, through making its efficiency the highest by platform increase and decrease method control refrigeration system;
S3, the optimal value of keeping said operational factor are moved said refrigeration system, close automatic analysis operational mode, open up to analyze operational mode automatically next time, return S1.
The method of the automatic analysis operation of preferably, adopting in the present embodiment.
Efficiency control in the S1 step mainly is to regulate the operational factor that shows in the monitoring interface, makes its actual value identical with optimal value, and is optimum to control every refrigeration host computer 4 efficiencies.Optimal value is in the state of continuous variation along with the variation of environmental condition; Algorithm computation through being built in the workstation1 draws and is presented on the monitoring interface, and assigns the above-mentioned operational factor of instruction adjusting control automatically through the program that is built in the workstation1.
Efficiency control comprises the efficiency control of separate unit refrigeration host computer 4, and the efficiency control of refrigeration host computer 4 comprises the operational factor or the efficiency control of cooling tower 6, cooling water pump 51, chilled water pump 52;
Another kind of embodiment is manually to set operational factor, according to fixing this refrigeration system of operational factor operation.
Further; Work station is provided with monitoring interface, and the operational factor that shows in the monitoring interface among the step S1 comprises efficient and the compressor efficiency and the refrigerating efficiency COP of condensation of refrigerant pressure in chilled water leaving water temperature, the cooling water pump 51, cooling tower 6 leaving water temperatures and thermal discharge efficiency, every refrigeration host computer 4; The operational factor that shows comprises the optimal value that calculates and the actual value of work at present state; Monitoring interface also shows the efficiency curve of every refrigeration host computer.
Monitoring interface can be realized the interface switching, makes things convenient for the user to observe individual event or several specific operational factors targetedly.
As shown in Figure 5, refrigeration host computer 4 compressors 41 in separate unit refrigeration host computer 4 compressors 41 efficiency control method application work station 1 server 12 are suffered from one's own actions constantly high energy efficiency point algorithm completion, may further comprise the steps:
A1, calculating compressor 41 actings and efficient,
Compressor work W
C, n=n/ (n-1) R
g* T
IN[(P
EX/ P
IN)
N-1/n-1] * Q/v
1* C%, wherein said operational factor comprises the suction temperature T of refrigeration host computer 4
IN, pressure of inspiration(Pi) P
IN, pressure at expulsion P
EX, refrigerant suction temperature T
INSpecific volume v
1, total inspiratory capacity Q of refrigeration host computer 4, the energy level C% of refrigeration host computer 4 compressors 41, the gas constant R of refrigerant
g, the polytropic exponent n of refrigerant;
Efficiency eta=the W of compressor 41
C, n/ KW.h, wherein said operational factor comprises that KW.h is the power consumption of refrigeration host computer 4 motors;
A2, through controller set and control chilled water leaving water temperature in a scope, the chilled water return water temperature is a fixed value; Utilize the refrigeration host computer controller built-in suffer from one's own actions the maximum algorithm, find out the efficiency eta maximum of compressor through regulating the chilled water leaving water temperature, obtain the chilled water leaving water temperature of this moment, said chilled water leaving water temperature should be higher than the lower limit of said scope;
A3, to regulate the actual chilled water leaving water temperature of control identical with the value of obtaining, and transfer to work station and be presented on the monitoring interface;
The refrigerating efficiency COP of A4, calculating and demonstration refrigeration host computer, COP=Q/KW.h, wherein KW.h is the power consumption of refrigeration host computer 4 motors, Q is the refrigerating capacity of refrigeration host computer 4;
The refrigerating capacity Q=C* Δ T of refrigeration host computer 4
1* FL
1, FL
1Be chilled-water flow, Δ T
1For chilled water goes out backwater temperature difference, C is the specific heat of water constant.
The pressure of inspiration(Pi) P that pressure sensor 8 on the turnover feed channel and temperature sensor 7 obtain refrigeration host computer respectively
INWith temperature T
IN, pressure at expulsion P
EXWith temperature T
EX, and passing to controller 3, controller 3 further passes to work station.Controller 3 can be regulated inlet valve or regulate chilled water leaving water temperature (more than the minimum point of its qualification) by the communication write command.
How many actings of compressor 41 is depended on and the Δ P pressure differential of exhaust (air-breathing with) and inspiratory capacity (guiding valve of negative and positive rotor or the aperture of intake valve).To should consider that the moment of torsion of motor also is by these two factor decisions to refrigeration host computer 4 energy savings from Δ P and maximum inhale measuring angle.To reduce compression ratio so, must reduce condensing pressure, make cooling effect better.And the optimum efficiency η of motor is about 85%.Capacity adjusting valve load full after, the power of motor is how much to depend on extraneous condensing pressure, efficiency that cannot main control system.Certain extraneous condensing pressure one regularly, the rated power of the actual power tendency 85% of adjusting (being actually) the control motor through capacity adjusting valve or ask for maximum (when power is lower than 85%) through suffering from one's own actions the maximum algorithm through adjusting coolant-temperature gage.Transition season or winter through experiment, all be lower than this, because of extraneous condensation effect good.Higher in summer because of condensing pressure, might control the power consumption and the main frame size matching of refrigeration host computer 4.Therefore the aspect of two contradictions is taken into consideration and is used, and condensing pressure is low more, and the main frame energy consumption is few more, and this moment is ideal if can regulate the rated power of the power tendency 85% that inspiratory capacity makes motor.Excessively season or winter,, produce inclined to one side refrigerant of low temperature as far as possible, also consume certain energy during the motor lowest power of refrigeration host computer after all,, help system's energy savings not as good as utilizing its efficient because of extraneous condensation effect is good.
If can not obtain the communication module of corresponding refrigeration host computer 4; Signal distributor is installed on the corresponding sensor transmission line is obtained above-mentioned parameter (or reinstall pressure-temperature sensor at the suction and discharge pipeline); Remove the chilled water leaving water temperature of refrigeration machine control panel and regulate (or capacity adjusting valve), utilize kind ability 3e
SMThe signal port that-T11 controller is corresponding inserts, so that the chilled water leaving water temperature can be regulated by controlled device algorithm.
Built-in cooling water pump 51 optimum flow algorithm constantly in moment optimum flow control method application work station 1 server 12 of separate unit cooling water pump 51 may further comprise the steps:
B1, calculating cold-producing medium saturation temperature T
Sa=T
Ci+ Δ T
Cd, wherein said operational factor comprises cooling water pump return water temperature T
CiWith heat-transfer effect temperature approach Δ T
Cd, heat-transfer effect temperature approach Δ T wherein
CdBe fixed value;
B2, with reference to cold-producing medium saturation temperature and pressure corresponding tables, draw the corresponding condensing pressure P of cold-producing medium
Th
B3, the controller 3 through cooling water pump 51 are with actual pressure P
CdWith the condensing pressure P in the corresponding tables
ThThe control cooling water pump is regulated in contrast, makes P
CdWith P
ThIdentical, this moment, the flow of cooling water pump 51 was an optimum flow, and transferred to work station and be presented on the monitoring interface.
Cooling water pump is provided with motor, adds frequency converter 11 on the motor, can carry out 11 pairs of cooling water pumps of PID control frequency converter to it through controller and carry out variable frequency adjustment.PID control is that engineering adjusted device control law is the abbreviation of ratio, integration, differential control.
Wherein, be provided with cold-producing medium saturation temperature and the pressure corresponding tables that supply to inquire about in the server 12 of workstation1, and be linked,, list no longer one by one here because this corresponding tables is a common practise with coolant pump moment optimum flow algorithm; Because the present invention can be applicable to the refrigeration unit of different model, so the cold-producing medium kind of using also has all differences, access from this corresponding tables according to refrigeration unit model and the cold-producing medium kind selected for use during practical implementation, be applied to coolant pump optimum flow algorithm constantly.
Built-in cooling tower 6 best leaving water temperature algorithm constantly in cooling tower 6 leaving water temperatures and efficiency control method application work station 1 server 12 may further comprise the steps:
The heat exhaust Q of C1, calculating cooling tower
2=C
2* Δ T
2* FL
2, FL wherein
2Be cooling tower water flow, Δ T
2For cooling tower goes out backwater temperature difference, C is the specific heat of water constant;
C2, thermal discharge efficiency COP
2=Q
2/ KW.h
2, wherein KW.h is the power consumption of cooling tower, Q is the heat exhaust of cooling tower 6; Utilize said controller 3 built-in suffer from one's own actions the maximum thermal discharge efficiency that the maximum algorithm is confirmed cooling tower, the cooling tower that obtains this moment goes out backwater temperature difference Δ T
2
The cooling tower leaving water temperature T of C3, calculating optimum
EXT=T
Wet+ Δ T
2, wherein said operational factor comprises that cooling tower goes out backwater temperature difference Δ T
2With extraneous wet-bulb temperature T
Wet, utilize said controller 3 to regulate control cooling tower leaving water temperatures, this moment, the cooling tower leaving water temperature reached optimum value, and transferred to work station and be presented on the monitoring interface.Control in this method is to utilize controller 3 in-built PID algorithms to instruct the speed of the frequency converter 11 variable frequency adjustment blower fans that are provided with on the motor to regulate the cooling tower leaving water temperature to reach optimum value.
Cooling tower is to be used for the cooling water that gets into is wherein sprayed at tower, makes it directly to contact with air, is dispersed into the cooling device that goes in the atmosphere to the heat that carries through evaporation and convection current.
Wherein extraneous wet-bulb temperature T
WetDemarcate a kind of means of relative air humidity, its connotation is that the air under a certain state is with the moistening thermometer bulb contact of wet bulb thermometer, the wet exchange of generation adiabatic heat, the temperature when making it reach capacity state.Near the cooling tower 6 outdoor environment is provided with Temperature Humidity Sensor 9, is used to obtain extraneous wet-bulb temperature.
Generally speaking, as extraneous wet-bulb temperature T
WetDuring more than or equal to 28.0 ℃, Δ T
2=4.5 ℃; As outdoor T
WetDuring greater than the lower limit of refrigeration host computer inflow temperature, constantly regulate Δ T less than 28.0 ℃ and cooling tower leaving water temperature
2, utilize COP=heat exhaust Q/ cooling tower power consumption KW.h to suffer from one's own actions the maximum algorithm, make and confirm Δ T
2, the cooling tower 6 best leaving water temperature T that contrast is calculated
EXT=T
Wet+ Δ T
2With the leaving water temperature of reality, the speed of utilizing the pid algorithm of controller 3 to instruct motor frequency conversion device 11 to regulate blower fans; When cooling tower 6 leaving water temperatures were less than or equal to the refrigeration host computer inflow temperature, the blower fan frequency was F=0HZ and out of service.In addition, because the computational methods of wet-bulb temperature are common practise, no longer specify here.
As 14 ℃ ℃＜T
WetIn the time of＜28.0 ℃, another kind of embodiment is to utilize the enthalpy of return water temperature calculating and the enthalpy Δ h of wet-bulb temperature to calculate Δ T
2
In addition, step S1 also comprises the control and regulation and the demonstration of chilled water water flow.The chilled water water flow is regulated according to terminal load variations.Frequency converter 11 is installed, through controller variable frequency adjustment chilled water pump, to change the water flow of chilled water on the motor of chilled water pump 52.Terminal load is meant the cooling load amount that refrigeration host computer is used to freeze and is produced.
Step S2 among the present invention comprises step by step following:
S21, said refrigeration host computer 4 chilled water return water temperatures are provided with fixed value, a leaving water temperature and are provided with a scope; Said refrigeration host computer 4 compressors, 41 efficient and load factor are provided with higher limit, and workstation1 reads the higher limit of said chilled water return water temperature, leaving water temperature scope and compressor efficiency and load;
S22, when the chilled water return water temperature greater than setting value, and compressor 41 efficient of the refrigeration host computer of having opened 4 and load factor increase a refrigeration host computer input during all more than or equal to its higher limit; When chilled water return water temperature during less than said setting value; Adopt the N-1 algorithm; The overall refrigerating effect that is about to reduce the refrigeration system of a refrigeration host computer is assigned on the N-1 platform refrigeration host computer; If the leaving water temperature of the chilled water that calculates is higher than the lower limit temperature of the scope of setting, then reduce refrigeration host computer 4 of operation;
If S23 refrigeration host computer 4 operation numbers change, returning step S1, to regulate every refrigeration host computer 4 efficiencies the highest, controls N+1 then or N-1 platform refrigeration host computer 4 efficiencies are the highest.
Step S2 of the present invention calls the group control algorithm of the high energy efficiency point of the built-in refrigeration unit sharing of load convergence of workstation servers; Pursuing in the platform increase and decrease method of this embodiment, compressor 41 efficient of refrigeration host computer 4 and the higher limit of load factor all are set to 85%, and this higher limit can be regulated according to the model of environmental condition and refrigeration host computer; The return water temperature that goes out of chilled water changes according to the change of environmental condition; One that reduces should be the highest refrigeration host computer of load, and whether efficient and the whole COP efficient of calculating compressor simultaneously descend, for every refrigeration machine in the team control by from the high energy efficiency point control of body controller.
In addition, the S0 step also comprises calculates current indoor thermic load, confirms the refrigeration host computer platform number of operation and opens the refrigeration host computer of counting on the same stage mutually with preliminary, too much makes the wasting of resources or very few and can't reach refrigeration with the refrigeration host computer platform number of avoiding opening.
Though the present invention describes through specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, to particular condition or material, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the claim scope of the present invention.
Claims (9)
1. refrigeration system efficiency control method; Said refrigeration system comprises work station (1), many refrigeration host computers (4); Said refrigeration host computer (4) is connected with cooling tower (6), cooling water pump (51), chilled water pump (52) and is used to control the controller (3) of its operational factor; It is characterized in that, said method comprising the steps of:
S0, refrigeration system initialization are opened analysis operational mode automatically according to preset interval time;
S1, gather the said operational factor of every refrigeration host computer (4) and calculate every refrigeration host computer (4) or the said operational factor of cooling tower (6) efficiency when optimum in real time, on work station (1) monitoring interface, show the optimal value of said operational factor; Work station (1) is controlled the said operational factor of said controller (3) adjusting according to this optimal value makes every refrigeration host computer (4) efficiency optimum;
S2, through making its efficiency the highest by platform increase and decrease method control refrigeration system;
S3, the optimal value of keeping said operational factor are moved said refrigeration system, close automatic analysis operational mode, open up to analyze operational mode automatically next time, return S1.
2. refrigeration system efficiency control method according to claim 1 is characterized in that, the efficiency control of refrigeration host computer among the said step S1 (4) also comprises the operational factor or the efficiency control of cooling tower (6), cooling water pump (51), chilled water pump (52);
The said operational factor that said monitoring interface shows comprises efficient and compressor (41) efficient and the refrigerating efficiency COP of condensation of refrigerant pressure, cooling tower (6) leaving water temperature and thermal discharge efficiency, every refrigeration host computer (4) in chilled water leaving water temperature, the cooling water pump (5); Said monitoring interface also shows the efficiency curve of every refrigeration host computer (4).
3. refrigeration system efficiency control method according to claim 2 is characterized in that, separate unit refrigeration host computer (4) compressor (41) efficiency control method may further comprise the steps:
A1, calculating compressor (41) acting and efficient,
Compressor work W
C, n=n/ (n-1) R
g* T
IN[(P
EX/ P
IN)
N-1/n-1] * Q/ ν
1* C%, wherein T
IN, P
IN, P
EX, be suction temperature, the pressure of inspiration(Pi) of refrigerant in the refrigeration host computer (4), pressure at expulsion, ν
1Be refrigerant suction temperature T
INSpecific volume, Q is total inspiratory capacity of refrigeration host computer (4), C% is the energy level of refrigeration host computer (4) compressor (41), R
gBe the gas constant of refrigerant, n is the polytropic exponent of refrigerant;
Efficiency eta=the W of compressor (41)
C, n/ KW.h, wherein KW.h is the power consumption of refrigeration host computer (4) motor;
A2, through controller (3) set and control chilled water leaving water temperature in a scope, the chilled water return water temperature is a fixed value; Utilize refrigeration host computer (4) controller (3) built-in suffer from one's own actions the maximum algorithm; Find out the efficiency eta maximum of compressor through regulating the chilled water leaving water temperature; Obtain the chilled water leaving water temperature of this moment, said chilled water leaving water temperature should be higher than the lower limit of said scope;
A3, to regulate the actual chilled water leaving water temperature of control identical with the value of obtaining, and transfer to work station and be presented on the monitoring interface;
The refrigerating efficiency COP of A4, calculating and demonstration refrigeration host computer, COP=Q/KW.h, wherein KW.h is the power consumption of refrigeration host computer (4) motor, Q is the refrigerating capacity of refrigeration host computer (4);
The refrigerating capacity Q=C* Δ T of refrigeration host computer (4)
1* FL
1, FL
1Be chilled-water flow, Δ T
1For chilled water goes out backwater temperature difference, C is the specific heat of water constant.
4. refrigeration system efficiency control method according to claim 2 is characterized in that, the moment optimum flow control method of separate unit cooling water pump (5) may further comprise the steps:
B1, calculating cold-producing medium saturation temperature T
Sa=T
Ci+ Δ T
Cd, T wherein
CiBe cooling water pump return water temperature, Δ T
CdBe the heat-transfer effect temperature approach, heat-transfer effect temperature approach Δ T
CdBe fixed value;
B2, with reference to cold-producing medium saturation temperature and pressure corresponding tables, draw the corresponding condensing pressure P of cold-producing medium
Th
B3, the controller (3) through cooling water pump (51) are with actual pressure P
CdWith the condensing pressure P in the corresponding tables
ThControl cooling water pump (51) is regulated in contrast, makes P
CdWith P
ThIdentical, this moment, the flow of cooling water pump was an optimum flow, and transferred to work station and be presented on the monitoring interface.
5. refrigeration system efficiency control method according to claim 2 is characterized in that, cooling tower (6) leaving water temperature and efficiency control method may further comprise the steps:
The heat exhaust Q of C1, calculating cooling tower
2=C* Δ T
2* FL
2, FL wherein
2Be cooling tower water flow, Δ T
2For cooling tower goes out backwater temperature difference, C is the specific heat of water constant;
C2, thermal discharge efficiency COP
2=Q
2/ KW.h
2, wherein KW.h is the power consumption of cooling tower, Q is the heat exhaust of cooling tower (6); Utilize said controller (3) built-in suffer from one's own actions the maximum thermal discharge efficiency that the maximum algorithm is confirmed cooling tower, the cooling tower that obtains this moment goes out backwater temperature difference Δ T
2
The cooling tower leaving water temperature T of C3, calculating optimum
EXT=T
Wet+ Δ T
2, wherein said operational factor comprises that cooling tower goes out backwater temperature difference Δ T
2With extraneous wet-bulb temperature T
Wet, utilize said controller (3) to regulate control cooling tower leaving water temperature, this moment, the cooling tower leaving water temperature reached optimum value, and transferred to work station and be presented on the monitoring interface.
6. refrigeration system efficiency control method according to claim 5 is characterized in that step S1 also comprises the control and regulation and the demonstration of chilled water water flow.
7. refrigeration system efficiency control method according to claim 1 is characterized in that step S2 comprises step by step following:
S21, said refrigeration host computer (4) chilled water return water temperature are provided with fixed value, a leaving water temperature and are provided with a scope; Said refrigeration host computer (4) compressor (41) efficient and load factor are provided with higher limit, and work station (1) reads the higher limit of said chilled water return water temperature, leaving water temperature scope and compressor efficiency and load;
S22, when the chilled water return water temperature greater than setting value, and compressor (41) efficient of the refrigeration host computer of having opened (4) and load factor increase a refrigeration host computer input during all more than or equal to its higher limit; When chilled water return water temperature during less than said setting value; Adopt the N-1 algorithm; The overall refrigerating effect that is about to reduce the refrigeration system of a main frame is assigned on the N-1 platform refrigeration host computer; If the leaving water temperature of the chilled water that calculates is higher than the lower limit temperature of the scope of setting, then reduce an operation refrigeration host computer (4);
If S23 refrigeration host computer operation number changes, returning step S1, to regulate every refrigeration host computer (4) efficiency the highest, controls N+1 then or N-1 platform refrigeration host computer (4) efficiency is the highest.
8. refrigeration system efficiency control method according to claim 1 is characterized in that, step S0 also comprises the indoor thermic load that calculating is current, with the refrigeration host computer platform number and the several on the same stage mutually refrigeration host computer of unlatching of preliminary definite operation.
9. according to any described refrigeration system efficiency control method of claim 1～8; It is characterized in that; Said work station (1) is controlled said controller (3) and is regulated said operational factor, the built-in algorithm routine that is used to control refrigeration system efficiency control method of said work station.
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