CN103375878A - Group control method for central air conditioning refrigerating unit - Google Patents
Group control method for central air conditioning refrigerating unit Download PDFInfo
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Abstract
The invention provides a group control method for a central air conditioning refrigerating unit. The group control method for the central air conditioning refrigerating unit comprises step A, entering into a step B when the water outlet temperature of a refrigerating unit basically achieves a stable temperature; step B, measuring the temperature and flow amount for water supply and water return of chilled water to obtain temperature difference and the flow amount of the water supply and the water return; step C, computing the load according to the temperature difference and the flow amount of the water supply and the water return; step D, controlling loading and unloading of refrigerating machines of the refrigerating unit. According to the group control method for the central air conditioning refrigerating unit, the group control algorithm for the refrigerating unit is achieved through thermal, the refrigerating unit is operated under an economical and energy saving state and the purposes of prolonging the service life of the device and reducing the energy consumption are achieved. The group control method for the central air conditioning refrigerating unit has a good popularization prospect in the fields of building automatic control and building energy saving.
Description
Technical field
The present invention relates to building intelligent system, particularly, relate to central air-conditioning freezing machine group control method.
Background technology
From the distribution of present building electricity consumption load, according to statistics, the power consumption of cold source equipment accounts for 40% of whole building electricity consumption.Especially in the peak time of electricity consumption, the situation of building cooling deficiency often can occur, and can cause the Continued of owner's electricity charge.
In recent years, it is day by day obvious building refrigerator cohort control system rationally to be controlled at building energy conservation aspect role.By adopting rational refrigerator cohort control method, can make the whole cooling in building can reach the desired comfort level of user in the building, can reach energy-conservation target again.
At present, aspect the control of building refrigerator cohort control system, return water temperature control method, flow-control method etc. are arranged, but all have certain shortcoming.
Return water temperature control method: measure chilled water system return water temperature in the air-conditioning system, it is worth size, determines to open the handpiece Water Chilling Units number of units, reaches control handpiece Water Chilling Units number of units order.This square law device is simple, low price.But return water temperature adaptability is relatively poor, and when especially having a narrow range of temperature, error is large, to energy-conservation unfavorable.Be used for only refrigerator low-temperature protection and warning.
Flow-control method: measure chilled-water flow and obtain flow signal, and then this flow value and handpiece Water Chilling Units metered flow are compared, realize the handpiece Water Chilling Units number of units is controlled.The flow-control principle is based on following three supposition:
A, load are directly proportional with flow
B, chilled water supply backwater temperature difference are constant
Move under c, the design conditions
But in fact, these three one of supposition can be set up, more impossible simultaneously establishment.Though the flow-control method can guarantee flow system flow, avoid the handpiece Water Chilling Units evaporimeter to freeze, can not fine adaptive system load variations.Coil pipe heat output and flow and linear relationship.The experiment and studies show that, be logarithmic relationship between chilled-water flow and the building thermic load.This relation companion chilled water inlet temperature, the coil size structure is different with coil surface ingress of air temperature and air velocity with coil surface area and change, and it is non-linear, and a many factors changes curve.Can not reflect load variations, can not be effectively energy-conservation.
Application (patent) number is 200610161414.8, the Chinese patent literature that name is called the energy-saving refrigerator group discloses a kind of energy-saving freezing unit, comprise cold mechanism cold EGR and user load EGR, be connected with compressor and condenser in the cold mechanism cold EGR, condenser is connected with cooling device, be connected with heat load and evaporimeter in the user load EGR, cold mechanism cold EGR and user load EGR carry out heat exchange by evaporimeter, and described user load EGR flows on the upstream position that is in evaporimeter at refrigerating medium and also is connected with supplementary heat exchanger; Supplementary heat exchanger and condenser are connected in parallel on the cooling device, make user's load cycle device and cooling device also can carry out heat exchange by supplementary heat exchanger; The present invention can use the nature cool cycles and carry out the heat spontaneous metastasis under the lower operating mode of environment temperature, or cooperates cold mechanism cold circulation to use simultaneously, has saved a large amount of electric energy, prolonged the service life of equipment, but also the phase interworking is used, and improves the reliability of cooling.
This invention belongs to the power-saving technology of refrigeration unit in the building, is the energy-saving design for refrigeration unit itself; And the present invention is applicable to adopt the exterior technology means to realize the group control energy-saving of refrigeration unit.
Application (patent) number is 201120089800.7, the Chinese patent literature that name is called a kind of independent freezing group relates to the Refrigeration Technique apparatus field, a kind of independent freezing group that small-sized refrigerator car uses that is applicable to is disclosed, comprise: motor, compressor, condenser, fluid reservoir, device for drying and filtering, heat exchanger, evaporimeter, and expansion valve, described motor is connected with described compressor, described compressor, condenser, fluid reservoir, device for drying and filtering, heat exchanger, and evaporimeter connects in turn, and described expansion valve is arranged on described heat exchanger and the pipeline that evaporimeter is connected.The purpose of this invention is to provide a kind of independent freezing group, freezed by motor direct driving compressor machine, need not to change the state of engine, thereby can not cause exhaust emissions to exceed standard energy-conserving and environment-protective.
This invention is for monomer independent cooling unit; And the present invention is applicable to the group control system of refrigeration unit in the building is controlled.
Application (patent) number discloses a kind of intelligent cluster control system of central air-conditioning for the Chinese patent literature that 200710026954.X, name are called intelligent cluster control system of central air-conditioning, comprise air-conditioner host, cooling tower, coolant pump, central processing unit, data acquisition unit, also comprise: cooling backwater, cooling water outlet temperature sensor, freezing backwater, leaving water temperature sensor, freezing backwater, discharge pressure sensor; The industrial computer that is connected with central processing unit, it reads the parameter of frequency converter by fieldbus; Also be provided with gateway between air-conditioner host and the industrial computer; Described sensor is connected with data acquisition unit, by data acquisition unit the signal that sensor gathers is uploaded to central processing unit.The present invention adopts the mode of a plurality of parameter team controls, takes full advantage of converter technique, and the surplus capacity of air conditioner refrigerating is reduced to minimum; Adopt industrial computer in time to store the service data of air-conditioning system, and form various power curve and shown that the user can check, revise by industrial computer the air-conditioning system operational factor.
This invention also is the intelligent cluster control system for central air-conditioning, but the team control object is complete central air conditioner system; And object-oriented of the present invention is mainly the refrigeration unit in the central air conditioner system.
The Chinese patent literature that application (patent) number is 200920296839.9, name is called central air-conditioning variable water volume variable air rate whole group-control energy saving system discloses a kind of energy so that the load of center air-condition circle water system and supply air system and energy consumption can be followed the variation of outdoor temperature, indoor load changes, and reduces the central air-conditioning variable water volume variable air rate whole group-control energy saving system of energy waste when guaranteeing comfortableness.Described central air-conditioning is comprised of five large subsystems, is respectively heat pump, wind system, chilled water storage system, air-conditioner circulating water variable water volume system and air conditioner in machine room wind system, all is provided with corresponding I/O module; Described I/O module is all plugged on RS-485 control network by the controller CPU module, passes through the TCP/IP network connection to overall control center by the controller network interface module again.Native system is controlled, need not artificial automatically, improves utilization rate of equipment and installations, and whole team control is so that system operates in reasonable and optimized state all the time.
This invention also is the intelligent cluster control system for central air-conditioning, but the team control object is the variable water volume variable air volume system of central air-conditioning; And object-oriented of the present invention is mainly the refrigeration unit in the central air conditioner system.
Summary of the invention
In the Ground Connection in Intelligent Building integrated project, the reasonable control of building low-temperature receiver (central air-conditioning freezing unit) is technological difficulties always.For defective of the prior art, the purpose of this invention is to provide a kind of central air-conditioning freezing machine group control method.This method as basic principle, utilizes the team control of central air-conditioning freezing unit to realize the reasonable control of building low-temperature receiver with heat control, makes the freezing unit energy of building satisfy the cooling of building central air-conditioning, and energy savings as much as possible.
According to an aspect of the present invention, provide a kind of central air-conditioning freezing machine group control method, comprise the steps:
Steps A: after the handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially, enter step B;
Step B: measure the chilled water supply and return water temperature and obtain supply backwater temperature difference and flow for circling water flow rate;
Step C: calculate load according to described supply backwater temperature difference and flowmeter;
Step D: loading and the unloading of cooling-water machine in the handpiece Water Chilling Units are controlled according to described load.
The present invention controls the algorithm of this a pair of handpiece Water Chilling Units team control by heat, and handpiece Water Chilling Units is operated under the energy-conservation more economically state, reaches the extension device life-span and reduces the purpose of energy consumption.This method has preferably promotion prospect in the automatic control of building and building energy saving field, has following advantage:
1, building energy conservation: according to the system loading size, open corresponding unit, stop corresponding water pump, or reduce the pump motor rotating speed, realize energy conservation object, save operating cost.
2, extension device service life: prolong freezing unit by control and prolong unit durability, improve equipment efficiency of usage.
3, environmental protection: by reasonable control, make resident family more comfortable, it is cold or overheated to avoid architectural environment to cross, and reaches building environment and energy-saving design requirement.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 illustrates the handpiece Water Chilling Units according to the present invention control flow chart of all rising/stop.
The specific embodiment
The present invention adopts the method for heat control to carry out the team control of refrigeration unit, purpose is the control of correct and suitable solution in the regional extent of operating point, with the chilled-water flow of measuring some point and the air conditioner load in whole building, as the judgment basis that starts or stops a refrigeration unit.
The present invention is when realizing, at first measure the chilled water supply and return water temperature and obtain the temperature difference and flow signal for (returning) discharge, then two signals are calculated actual chilling requirement according to Thermodynamics Formulas, again this cold value and handpiece Water Chilling Units refrigeratory capacity are compared, and then realization is to the control of handpiece Water Chilling Units start-stop and the quantity that puts into operation.
Particularly, according to central air-conditioning freezing machine group control method provided by the invention, comprise step: steps A: after the handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially, enter step B; Step B: measure the chilled water supply and return water temperature and obtain supply backwater temperature difference and flow for circling water flow rate; Step C: calculate load according to described supply backwater temperature difference and flowmeter; Step D: loading and the unloading of cooling-water machine in the handpiece Water Chilling Units are controlled according to described load.
More specifically, described steps A comprises step: steps A 1: whether the opening time of judging the cooling-water machine of the first number of units in the handpiece Water Chilling Units surpasses first threshold; Steps A 2: if the opening time of the cooling-water machine of the first number of units surpasses first threshold in the handpiece Water Chilling Units, judge that then the handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially.Wherein, in a preference, the cooling-water machine of described the first number of units is the cooling-water machine of a power consumption minimum in the handpiece Water Chilling Units, and described first threshold is 60 minutes.
Further particularly, described load comprises average load and the instant load of very first time during point in the very first time section, and described step D comprises step: step D1: judge that described average load and instant load reach the percentage of Design cooling load; Step D2: determine cooling-water machine to be stopped according to described percentage; Step D3: determine cooling-water machine to be opened according to described percentage.Described central air-conditioning freezing machine group control method also comprises step: step e: enter step B after keeping for the second time period.Can guarantee so not frequent starting cooling-water machine.
Preferably, the present invention proposes to adopt the method for heat control to carry out the team control of refrigeration unit, namely measure the chilled water supply and return water temperature and obtain the temperature difference and flow signal for (returning) discharge, then two signals are calculated actual chilling requirement according to Thermodynamics Formulas, again this cold value and handpiece Water Chilling Units refrigeratory capacity are compared, realize the handpiece Water Chilling Units number of units is controlled.Wherein:
Load calculates: Q=k*F*c*dT
Q: load (KW)
K: specific heat of water 4.186kJ/kg ℃
F: flow (L/S)
DT: supply backwater temperature difference
In a specific embodiment of the present invention, take 2 direct-burning lithium bromide absorption cold-hot water assembings and 1 group control system of becoming of refrigeration screw-type water chiller as example, control method can be by following flow process realization:
The cold machine of First is to need artificial the unlatching because whole chilled water system can not freeze so soon, need to wait until that the First handpiece Water Chilling Units starts 60min after, the handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially, the warm boot load calculates.Calculate the average load Q of (time can be adjusted according to on-the-spot reality) in the 15min time
0With instant load Q
1As next step control foundation.If Q
00 value appears or that moment Q after 15 minutes
1Be 0 value, illustrate and load this moment unstablely or few that cold machine enough guarantees the load needs.Continue to calculate the load in next 15 minutes.
If Q
0And Q
1All greater than 0, illustrating has workload demand in these 15 minutes, next will judge Q
0And Q
1Whether all reach 34% of design total load, only have all to reach 34% and could illustrate that present workload demand is stable, and surpass the rated capacity of the cold machine of existing operation, so just change next one judgement link over to.But if a value is arranged less than below 34%, and showing that so this time load still has fluctuation, also to judge according to load and maintain the statusquo or unload.
If maintain the statusquo, program changes over to again calculates next 15 minutes air conditioner load; If add unloading, then also will work entered later on load calculating link in 30 minutes again, and this is in order to guarantee the not cold machine of frequent starting.
According to the front material computation, when present load during total load 34%, is only driven (direct-fired) cold machine less than design.Because reached before 34% at load, open energy shortage that two cold machines save in offsetting the energy of opening a chilled water pump consumption more.Drive two (direct-fired) cold machines when total load 34%～65% the time, if total load reaches 65%, consider that the cold machine power consumption of screw is huge, do not drive the cold machine of screw this moment.When total load reached 68%, opened the cold machine of screw this moment, when load 65%～92% the time, keep three cold machine on-line operations.Otherwise unloading.
And in another specific embodiment of the present invention as shown in Figure 1, in this specific embodiment, 0%, 20%, 38%, 55%, 70% open the division points of number of units as handpiece Water Chilling Units with what design met, and will load or unload holding time behind the cooling-water machine and be set as 30 minutes.Those skilled in the art understand, executive basis average load and instant load reach the percentage of Design cooling load and start or inactive cooling-water machine in, can set concrete percentage division points according to the actual conditions such as unit information of cooling-water machine, this does not affect flesh and blood of the present invention, does not repeat them here.
Wherein, the control of freezing unit body is finished by freezing unit producer.Require by the control of finishing freezing unit with the communication interface of refrigerator set control system: the conversion and control of refrigerator number of units controlling run order is according to the supply backwater temperature difference of water system and the refrigeration duty of flow rate calculation air-conditioning system, actual in cold according to unit simultaneously, submit the on off control application to the refrigerator set control system, and finish the start and stop action by the refrigerator set control system.
According to the communications protocol of handpiece Water Chilling Units, all unit information can be read out, as: unit load rate, running current voltage, compressor state, condensing pressure, the bulbs of pressure, Inlet and outlet water temperature, oil pressure, continuous working period etc.Benefit for optimizing whole team control scheme by gathering above-mentioned parameter.By relatively rate of load condensate and the current parameters of each unit, again with the comprehensive loading number of units of determining more afterwards unit of pipe-line system load science more.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (6)
1. a central air-conditioning freezing machine group control method is characterized in that, comprises the steps:
Steps A: after the handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially, enter step B;
Step B: measure the chilled water supply and return water temperature and obtain supply backwater temperature difference and flow for circling water flow rate;
Step C: calculate load according to described supply backwater temperature difference and flowmeter;
Step D: loading and the unloading of cooling-water machine in the handpiece Water Chilling Units are controlled according to described load.
2. central air-conditioning freezing machine group control method according to claim 1 is characterized in that described steps A comprises the steps:
Steps A 1: whether the opening time of judging the cooling-water machine of the first number of units in the handpiece Water Chilling Units surpasses first threshold;
Steps A 2: if the opening time of the cooling-water machine of the first number of units surpasses first threshold in the handpiece Water Chilling Units, judge that then the handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially.
3. central air-conditioning freezing machine group control method according to claim 2 is characterized in that, the cooling-water machine of described the first number of units is the cooling-water machine of a power consumption minimum in the handpiece Water Chilling Units.
4. according to claim 2 or 3 described central air-conditioning freezing machine group control methods, it is characterized in that described first threshold is 60 minutes.
5. each described central air-conditioning freezing machine group control method in 4 according to claim 1 is characterized in that, described load comprises average load and the instant load of very first time during point in the very first time section, and described step D comprises the steps:
Step D1: judge that described average load and instant load reach the percentage of Design cooling load;
Step D2: determine cooling-water machine to be stopped according to described percentage;
Step D3: determine cooling-water machine to be opened according to described percentage.
6. each described central air-conditioning freezing machine group control method in 5 according to claim 1 is characterized in that, also comprises the steps:
Step e: enter step B after keeping for the second time period.
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