CN103375878B - A kind of central air-conditioning freezing unit group control method - Google Patents
A kind of central air-conditioning freezing unit group control method Download PDFInfo
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Abstract
The present invention provides a kind of central air-conditioning freezing unit group control method, including step: step A: enter step B after handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially；Step B: measure 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 effusion meter；Step D: the loading of cooling-water machine in handpiece Water Chilling Units and unloading are controlled according to described load.The present invention controls the algorithm of this pair handpiece Water Chilling Units team control by heat, effectively makes handpiece Water Chilling Units operate under state energy-conservation more economically, reaches the extension device life-span and reduces the purpose of energy consumption.This method has good promotion prospect at building automation and coutrol and building energy saving field.
Description
Technical field
The present invention relates to building intelligent system, in particular it relates to central air-conditioning freezing unit group control method.
Background technology
From the distribution of current building electricity consumption load, according to statistics, the power consumption of cold source equipment accounts for the 40% of whole building electricity consumption.Particularly in the peak time of electricity consumption, the situation that building cooling is not enough often occurs, and the Continued of owner's electricity charge can be caused.
In recent years, building fridge group Ore-controlling Role is carried out conservative control role in building energy conservation day by day obvious.By adopting rational fridge group group control method, it is possible to make the overall cooling in building can reach in building the comfort level required by user, energy-conservation target can be reached again.
At present, in the control of building fridge group Ore-controlling Role, there are return water temperature control methods, flow-control method etc., but all there is certain shortcoming.
Return water temperature control methods: measure chilled water system return water temperature in air conditioning system, its value size, determines to open handpiece Water Chilling Units number of units, reaches to control handpiece Water Chilling Units number of units order.This square law device is simple, low price.But return water temperature adaptability is poor, when especially having a narrow range of temperature, error is big, to energy-conservation unfavorable.It is only available for fridge low-temperature protection and warning.
Flow-control method: measure chilled-water flow and obtain flow signal, then again this flow value and handpiece Water Chilling Units metered flow are compared, it is achieved to handpiece Water Chilling Units unit number control.Flow control principle is based on three below and supposes:
A, load are directly proportional to flow
B, chilled water supply backwater temperature difference are constant
Run under c, design conditions
But can set up it practice, these three supposes one, more impossible set up simultaneously.Though flow-control method can guarantee that flow system flow, it is to avoid handpiece Water Chilling Units vaporizer freezes, but can not adaptive system load variations very well.Coil pipe heat output and flow linear relationship.Experiment and research show, in logarithmic relationship between chilled-water flow and building thermic load.This relation accompanies chilled water inlet temperature, coil size structure is different with coil surface ingress of air temperature and air velocity with coil surface area and changes, and it is non-linear, a many factors variation curve.Load variations can not be reflected, it is impossible to effectively energy-conservation.
Application Number (patent) is 200610161414.8, name is called that the Chinese patent literature of energy-saving refrigerator group discloses a kind of energy-saving freezing unit, including cold refrigerating circulatory device and user load circulating device, cold refrigerating circulatory device is connected to compressor and condenser, condenser is connected to chiller, user load circulating device is connected to heat load and vaporizer, cold refrigerating circulatory device and user load circulating device carry out heat exchange by vaporizer, described user load circulating device flows at refrigerating medium and is on the upstream position of vaporizer and is also associated with supplementary heat exchanger；Supplementary heat exchanger and condenser are connected in parallel on chiller, make user's load cycle device and chiller carry out heat exchange also by supplementary heat exchanger；The present invention can apply natural cooling circulation under the operating mode that ambient temperature is relatively low and carry out heat spontaneous metastasis, or coordinates cold kind of refrigeration cycle to use simultaneously, has saved a large amount of electric energy, has extended the service life of equipment, also phase interworking can use, improve the reliability of cooling.
This invention belongs to the power-saving technology of refrigeration unit in building, is the energy-saving design for refrigeration unit itself；And the present invention is applicable for use with exterior technology means and realizes the group control energy-saving of refrigeration unit.
Application Number (patent) is 201120089800.7, name is called that the Chinese patent literature of a kind of independent freezing group relates to Refrigeration Technique apparatus field, disclose a kind of independent freezing group used suitable in small-sized refrigerator car, including: motor, compressor, condenser, fluid reservoir, device for drying and filtering, heat exchanger, vaporizer, and expansion valve, described motor is connected with described compressor, described compressor, condenser, fluid reservoir, device for drying and filtering, heat exchanger, and vaporizer is sequentially connected with, described expansion valve is arranged on the pipeline that described heat exchanger is connected with vaporizer.It is an object of the invention to provide a kind of independent freezing group, motor directly drive compressor to freeze, it is not necessary to changing the state of electromotor, exceeding standard thus not resulting in exhaust emissions, energy-conserving and environment-protective.
This invention is for monomer independent cooling unit；And the present invention is controlled suitable in the group control system of refrigeration unit building.
Application Number (patent) is that 200710026954.X, name are called that the Chinese patent literature of intelligent cluster control system of central air-conditioning discloses a kind of intelligent cluster control system of central air-conditioning, including air-conditioner host, cooling tower, cooling pump, central processing unit, data acquisition unit, also include: cooling backwater, cooling water outlet temperature sensor, freezing backwater, leaving water temperature sensors, freezing backwater, discharge pressure sensor；The industrial computer being connected with central processing unit, it reads the parameter of converter by fieldbus；Gateway it is additionally provided with between air-conditioner host and industrial computer；Described sensor is connected with data acquisition unit, data acquisition unit the signal gathered by sensor is uploaded to central processing unit.The present invention adopts the mode of multiple parameter team control, makes full use of converter technique, and the surplus capacity of air conditioner refrigerating is reduced to minimum；Adopting industrial computer to store the service data of air conditioning system in time, and form various power curve and shown, user can be checked by industrial computer, revise air conditioning system operational factor.
This invention is also the intelligent cluster control system for central air-conditioning, but team control object is integral central air conditioning system；And object-oriented of the present invention is mainly the refrigeration unit in central air conditioner system.
Application Number (patent) is 200920296839.9, name is called that the Chinese patent literature of central air-conditioning variable water volume variable air rate whole group-control energy saving system discloses a kind of load that can make central air-conditioning circulation and supply air system and energy consumption can follow outdoor temperature, the change of indoor load changes, it is ensured that reduce the central air-conditioning variable water volume variable air rate whole group-control energy saving system of energy waste while comfortableness.Described central air-conditioning is made up of five big subsystems, is heat pump, wind system, chilled water storage system, air-conditioner circulating water variable flow pumping system and air conditioner in machine room wind system respectively, is both provided with corresponding I/O module；Described I/O module is plugged into each through controller CPU module and is controlled on network at RS-485, then is connected to overall control center by controller network interface module by TCP/IP network.Native system automatically controls, without artificially, improving utilization rate of equipment and installations, overall team control so that system operates in reasonable and optimized state all the time.
This invention is also the intelligent cluster control system for central air-conditioning, but the variable water volume variable air volume system that team control object is central air-conditioning；And object-oriented of the present invention is mainly the refrigeration unit in central air conditioner system.
Summary of the invention
In Ground Connection in Intelligent Building integrated project, the conservative control of building low-temperature receiver (central air-conditioning freezing unit) is always up technological difficulties.For defect of the prior art, it is an object of the invention to provide a kind of central air-conditioning freezing unit group control method.This method controls as ultimate principle using heat, utilizes central air-conditioning freezing unit team control to realize the conservative control of building low-temperature receiver, makes building freezing unit energy meet the cooling of building central air-conditioning, and save the energy as much as possible.
According to an aspect of the present invention, it is provided that a kind of central air-conditioning freezing unit group control method, comprise the steps:
Step A: enter step B after handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially；
Step B: measure 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 effusion meter；
Step D: the loading of cooling-water machine in handpiece Water Chilling Units and unloading are controlled according to described load.
The present invention controls the algorithm of this pair handpiece Water Chilling Units team control by heat, effectively makes handpiece Water Chilling Units operate under state energy-conservation more economically, reaches the extension device life-span and reduces the purpose of energy consumption.This method has good promotion prospect at building automation and coutrol and building energy saving field, has the advantage that
1, building energy conservation: according to system loading size, opens corresponding unit, stops corresponding water pump, or reduces pump motor rotating speed, it is achieved energy conservation object, saves operating cost.
2, extension device service life: extend unit durability by controlling the freezing unit of prolongation, improve equipment efficiency of usage.
3, environmental conservation: by conservative control, makes resident family more comfortable, it is to avoid architectural environment is supercool or overheated, reaches building environment and energy-saving design requirement.
Accompanying drawing explanation
By reading detailed description non-limiting example made with reference to the following drawings, the other features, objects and advantages of the present invention will become more apparent upon:
Fig. 1 illustrates that the handpiece Water Chilling Units according to the present invention is all risen/stop control flow chart.
Detailed description of the invention
The present invention adopts method that heat controls to carry out the team control of refrigeration unit, purpose is in that correct and suitable solution control within the scope of operating point regions, the air conditioner load of chilled-water flow and whole building to measure some point, as the judgment basis starting or stoping a refrigeration unit.
The present invention is when realizing, first measure 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 realize the control to handpiece Water Chilling Units start-stop and the quantity that puts into operation.
Specifically, according to central air-conditioning freezing unit group control method provided by the invention, including step: step A: enter step B after handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially；Step B: measure 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 effusion meter；Step D: the loading of cooling-water machine in handpiece Water Chilling Units and unloading are controlled according to described load.
More specifically, described step A includes step: step A1: judge in handpiece Water Chilling Units, whether the opening time of the cooling-water machine of the first number of units exceedes first threshold；Step A2: if the opening time of the cooling-water machine of the first number of units exceedes first threshold in handpiece Water Chilling Units, then judge that handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially.Wherein, in a preference, the cooling-water machine of described first number of units is the cooling-water machine that in handpiece Water Chilling Units, a power consumption is minimum, and described first threshold is 60 minutes.
Further specifically, described load includes the instant load when average load in first time period and very first time point, and described step D includes step: step D1: judge that described average load and instant load reach the percentage ratio of design load；Step D2: determine cooling-water machine to be stopped according to described percentage ratio；Step D3: determine cooling-water machine to be opened according to described percentage ratio.Described central air-conditioning freezing unit group control method further comprises the steps of: step E: enter step B after maintaining for the second time period.So ensure that and infrequently start cooling-water machine.
Preferably, the method that the present invention proposes to adopt heat to control is to carry out the team control of refrigeration unit, namely measure 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, it is achieved to handpiece Water Chilling Units unit number control.Wherein:
Carry calculation: Q=k*F*c*dT
Q: load (KW)
K: specific heat of water 4.186kJ/kg DEG C
F: flow (L/S)
DT: supply backwater temperature difference
In a specific embodiment of the present invention, for the group control system that 2 direct-burning lithium bromide absorption cold-hot water assembings and 1 refrigeration screw-type water chiller become, control method can be realized by following flow process:
First cold need to manually be opened, owing to whole chilled water system will not so be freezed soon, it is necessary to after waiting until that First handpiece Water Chilling Units starts 60min, handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature, warm boot carry calculation substantially.Calculate the average load Q of (time can according to on-the-spot actual adjustment) in the 15min time0With instant load Q1Control foundation as next step.If Q0Occur that 0 is worth or that moment Q after 15 minutes1Being 0 value, illustrate that now load is unstable or few, a cold enough ensures load needs.Continue to calculate next 15 minutes interior loads.
If Q0And Q1It both is greater than 0, in this being described 15 minutes, has workload demand, next to judge Q0And Q1Whether all reach the 34% of design total load, only all reach 34% and could illustrate that current workload demand is stable, and exceed the rated capacity of existing operation cold, then proceed to the next one and judge link.If but had a value less than less than 34%, then would show that this time, load still had fluctuation, also to judge according to load to maintain the statusquo or unload.
If maintaining the statusquo, program proceeds to the air conditioner load calculating next 15 minutes again；If adding unloading, then entering back into carry calculation link after also working 30 minutes, this is to ensure that and infrequently starts cold.
According to above material computation, when current load is less than design total load 34%, only open (direct-fired) cold.Because reaching before 34% at load, opening the energy that two cold save and being not enough to offset the energy opening a chilled water pump consumption more.When total load opens two (direct-fired) cold when 34%～65%, if total load reaches 65%, it is contemplated that screw cold power consumption is huge, now do not open screw cold.When total load reaches 68%, now open screw cold, when load is when 65%～92%, keep three cold on-line operations.Otherwise unloading.
And the present invention another embodiment as shown in Figure 1, in this specific embodiment, 0%, 20%, 38%, 55%, 70% design met opens the division points of number of units as handpiece Water Chilling Units, and holding time after loading or unloading cooling-water machine is set as 30 minutes.Skilled artisan understands that, reach the percentage ratio of design load in execution according to average load and instant load and start or disable in cooling-water machine, concrete percentage ratio division points can be set according to practical situations such as the unit information of cooling-water machine, this has no effect on the flesh and blood of the present invention, does not repeat them here.
Wherein, the control of freezing unit body is completed by freezing unit producer.By completing the control of freezing unit is required with the communication interface of fridge set control system: the refrigeration duty of the conversion and control of the fridge unit number control operation order supply backwater temperature difference according to water system and flow rate calculation air conditioning system, simultaneously according to the actual semen donors of unit, submit on off control application to fridge set control system, and completed start-stop by fridge set control system.
All unit information can be read out by the communications protocol according to handpiece Water Chilling Units, 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 overall team control scheme by gathering above-mentioned parameter.By the rate of load condensate of relatively each unit and current parameters, then determined that the loading number of units of unit was by more science later with tubing load Integrated comparative.
Above specific embodiments of the invention are described.It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims, and this has no effect on the flesh and blood of the present invention.
Claims (2)
1. a central air-conditioning freezing unit group control method, it is characterised in that comprise the steps:
Step A: enter step B after handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially；
Step B: measure 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 effusion meter；
Step D: the loading of cooling-water machine in handpiece Water Chilling Units and unloading are controlled according to described load；
Described step A comprises the steps:
Step A1: judge in handpiece Water Chilling Units, whether the opening time of the cooling-water machine of the first number of units exceedes first threshold；
Step A2: if the opening time of the cooling-water machine of the first number of units exceedes first threshold in handpiece Water Chilling Units, then judge that handpiece Water Chilling Units leaving water temperature reaches equilibrium temperature substantially；
The cooling-water machine of described first number of units is the cooling-water machine that in handpiece Water Chilling Units, a power consumption is minimum；
Described first threshold is 60 minutes；
Also comprise the steps:
Step E: enter step B after maintaining for the second time period.
2. central air-conditioning freezing unit group control method according to claim 1, it is characterised in that described load includes the instant load when average load in first time period and very first time point, and described step D comprises the steps:
Step D1: judge that described average load and instant load reach the percentage ratio of design load；
Step D2: determine cooling-water machine to be stopped according to described percentage ratio；
Step D3: determine cooling-water machine to be opened according to described percentage ratio.
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