CN1796884A - On site control device for cold water main unit in energy saving control system of central air conditioner - Google Patents
On site control device for cold water main unit in energy saving control system of central air conditioner Download PDFInfo
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- CN1796884A CN1796884A CN 200410082327 CN200410082327A CN1796884A CN 1796884 A CN1796884 A CN 1796884A CN 200410082327 CN200410082327 CN 200410082327 CN 200410082327 A CN200410082327 A CN 200410082327A CN 1796884 A CN1796884 A CN 1796884A
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Abstract
An on - site control device of cold water host on central air conditioning energy - saving system consists of microprocessor including signal collection unit for collecting signal from load transducer set on air conditioning, calculation unit for calculating out load according to collected signal, machine adding unit for adding more machine to work when cold water host is overloaded, machine decreasing unit for reducing numbers of machine in operation when cold water host is operated insufficiently and load optimum distribution unit with storage component and secondary calculation component as well as execution component.
Description
(1) technical field
The present invention relates to a kind of central air-conditioning centralized control system, especially a kind of central air conditioner system of forming at many handpiece Water Chilling Units is carried out the cold water main unit field controller in the integrated comfort system of Energy Saving Control and adjusting.
(2) background technology
Existing central air-conditioning handpiece Water Chilling Units, with regard to its separate unit handpiece Water Chilling Units, its automaticity height, flexible and convenient to use, unit can be realized automatic Load Regulation, its adjustable range is 10%-100%.But how effectively managing for many handpiece Water Chilling Units, is not a simple question just.
With reference to Fig. 1, temperature sensor 3 and flow sensor 4 on the water main 1 by being installed in chilled water system, return main 2 (or water knockout drum, water collector), cold water main unit 6 is communicated with return main 2 by water pump 5, detect supply backwater temperature difference and flow, and then calculate the load of air-conditioning system, decide the unlatching platform number of cold water main unit 6 on this basis, thereby the realization handpiece Water Chilling Units is carried out platform numerical control system according to the variation of system loading.
Significantly, above-mentioned control method is to regard handpiece Water Chilling Units as one " black box ", only depend on temperature sensor and flow sensor on the water main that is installed in chilled water, return main (or water knockout drum, water collector), the load that detects air-conditioning system carries out the control and the management of many units, does not obviously reach ideal control effect.
(3) summary of the invention
Can not optimize distribution load, deficiency that energy consumption is bigger to each main frame in order to overcome existing central air-conditioning cold water main unit control device, the invention provides a kind of can be every cold water main unit distribution load automatically, reaches the cold water main unit on-site control device of the central air-conditioning energy control system of maximum energy-saving.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of cold water main unit on-site control device of central air-conditioning energy control system comprises microprocessor, and described microprocessor comprises: a signal gathering unit is used to gather the signal that is installed on the sensor relevant with load on the central air-conditioning; One load computing unit is used for the signal according to the sensor on the described central air-conditioning, calculates the total load of central air-conditioning; One adds the machine unit, is used for sending start command signal to cold water main unit to be started after described total load exceeds the rated load of existing cold water main unit; One subtracts the machine unit, is used for sending cut-off command to cold water main unit to be closed after the rated load of described total load less than existing cold water main unit; Also comprise optimum cold water main unit sharing of load unit, these allocation units comprise:
One memory cell, be used to store each operating point of described cold water main unit and the corresponding relation of energy consumption, and when the setting total load is between n platform and the specified total load of n+1 platform cold water main unit, to set total load with this and distribute to n+1 platform cold water main unit successively, set up the corresponding relation of setting total load, each cold water main unit operating point, each cold water main unit energy consumption, and set up the initial index of setting total load, wherein n is a natural number;
One once more load gauge calculate the unit, be used for add the machine unit carry out add the machine instruction or subtract the machine unit carry out subtract the machine instruction after, and calculate the total load of each current cold water main unit; One redistributes the unit, is used for the total load that obtains according to the computing unit of loading once more, and from the initial index of memory cell, relatively the main frame energy consumption sum of each cold water main unit obtains minimum total energy consumption, and obtains the operating point of each cold water main unit; One performance element is used for sending operating instruction according to the operating point of redistributing each cold water main unit that the unit obtains to each cold water main unit.
Further, described microprocessor also comprises a monitoring unit, be used to gather the running state parameter of cold water main unit, the dynamic throttling instrument of central air-conditioning is to the state of a control parameter of refrigerating water pump, coolant pump, heat-exchanger pump, cold source system freezing temperature and pressure reduction for backwater, the total temperature that supplies water of cooling, each branch is freezing, the electric butterfly valve state parameter of cooling water channel, the running state parameter of end-equipment, and the standard value of each parameter and default made comparisons, optionally the alarm unit to microprocessor sends the startup alarm signal.
Further again, the sensor relevant with load comprises the temperature sensor of the evaporator water side that is installed on main frame, the temperature sensor of Water in Condenser side, the temperature sensor of evaporator refrigerant side, pressure sensor, the temperature sensor of condenser refrigerant side, pressure sensor.
The sensor relevant with load also can be water supply, the temperature sensor on the return main, the flow sensor for being installed on central air-conditioning.
Described microprocessor is provided with the RS-485/232 interface that carries out information communication with cold water main unit, interconnects with the daisy chain form between a plurality of RS-485/232 interfaces.
The energy consumption of cooling-water machine attracts people's attention most, it is made of factors such as compress mode, refrigerant, refrigerating capacity, compressor specification and heat exchanger specifications, has only the product performance of being familiar with refrigeration unit, develop on this basis, different qualities in conjunction with cooling-water machine, make optimized calculation procedure, obtain best energy-saving effect, this is that general control system is incomparable.
Beneficial effect of the present invention mainly shows: 1, optimum cold water main unit sharing of load unit carries out sharing of load to each cold water main unit, and each cold water main unit is in operating point work separately, and its total energy consumption is minimum, reaches maximum energy-saving; 2, read whole parameters of cold water main unit, possess to cold water main unit comprehensively monitoring and ability to communicate 3, by detecting the inner parameter calculated load of cold water main unit, the load calculating of cold water main unit is more accurate.
(4) description of drawings
Fig. 1 is the structural representation of many cold water main units of the central air-conditioning of prior art.
Fig. 2 is the structure principle chart of control device of the present invention.
Fig. 3 is the flow chart of control device of the present invention.
Fig. 4 is the operational energy efficiency figure of the cold water main unit of embodiment 3.
(5) specific embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 2, Fig. 3, a kind of cold water main unit on-site control device of central air-conditioning energy control system, comprise microprocessor 7, described microprocessor 7 comprises: a signal gathering unit is used to gather the signal of the water supply that is installed on central air-conditioning, the temperature sensor on the return main, flow sensor; One load computing unit is used for water supply, the temperature sensor on the return main according to central air-conditioning, the signal of flow sensor, calculates the total load of central air-conditioning; One adds the machine unit, is used for sending start command signal to cold water main unit to be started 6 after described total load exceeds the rated load of existing cold water main unit 6; One subtracts the machine unit, is used for sending cut-off command to cold water main unit to be closed 2 after the rated load of described total load less than existing cold water main unit 2; Also comprise optimum cold water main unit sharing of load unit, these allocation units comprise: a memory cell, be used to store each operating point of described cold water main unit 2 and the corresponding relation of energy consumption, and when the setting total load is between n platform and the specified total load of n+1 platform cold water main unit, to set total load with this and distribute to n+1 platform cold water main unit successively, set up the corresponding relation of setting total load, each cold water main unit operating point, each cold water main unit energy consumption, and set up the initial index of setting total load, wherein n is a natural number; One once more load gauge calculate the unit, be used for add the machine unit carry out add the machine instruction or subtract the machine unit carry out subtract the machine instruction after, and calculate the total load of each current cold water main unit; One redistributes the unit, be used for the total load that obtains according to the computing unit of loading once more, from the initial index of memory cell, relatively the main frame energy consumption sum of each cold water main unit obtains minimum total energy consumption, and obtain the operating point of each cold water main unit, one performance element is used for sending operating instruction according to the operating point of redistributing each cold water main unit that the unit obtains to each cold water main unit.
Tens state parameters of monitoring cold water main unit are as follows:
START-Start/Stop unit opens/stops
LCHW-TEMP.SP-Leaving Chilled Water Temp Setpoint sets freezing leaving water temperature value
The long-range setting current value of %CURRENT.SP-Remote Current Setpoint
LCHWT.-the freezing leaving water temperature of Leaving Chilled Water Temperature
ECHWT.-the freezing return water temperature of Entering Chilled Water Temperature
EVAPPR.-Evaporator Pressure evaporator pressure
CONDPR.-Condenser Pressure condenser pressure
LCDWT.-Leaving Condenser Water Temperature cooling water leaving water temperature
ECDWT.-Entering Condenser Water Temperature cooling water return water temperature
EVAPST.-Evaporator Saturation Temperature evaporimeter saturation temperature
CONDST.-Condenser Satruation Temperature condenser saturation temperature
DISCHT.-Discharge Temperature delivery temperature
DRN LIN.TEMP-Drain Line Thermocouple Temp. electric thermo-couple temperature
OILT.-Oil Temperature oil temperature
OILPR.-Oil Pressure oil pressure
%CURR-ACT.SP-Current Limit Setpoint current limliting setting value
%CURRENT-Percent Motor Current current of electric percentage
RUN.HOURS-Accounted Operating Hours running time
LWT RST.OFF-Leaving Water Restart Offset leaving water temperature restarts setting
With reference to Fig. 3, the running of many cold water main units of central air-conditioning is:
(1), behind the selected cold water main unit, start cooling tower, coolant pump, refrigerating water pump, restart cold water main unit, and the state of definite cold water main unit;
(2), read each parameter of cold water main unit, be convenient to monitor in real time the running status of cold water main unit, take place if any abnormal conditions, send the instruction that starts alarm signal to alarm unit;
(3), open at cold water main unit/close down after, delayed time 30 minutes, determine that this cold water main unit is in steady operational status;
(4), according to the calculating of loading of the inner parameter of the cold water main unit that collects;
(5), exceed the rated load of existing cold water main unit at described total load after, send start command signal to cold water main unit to be started; Repeat the operation of (1)-(4), and, promptly carry out the LC pattern, the load of each cold several main frame of operation is redistributed, reach the total energy consumption minimum of each cold water main unit according to optimum cold water main unit sharing of load unit;
(6), after the rated load of described total load less than existing cold water main unit, send cut-off command to cold water main unit to be closed; Stop cooling-water machine, refrigerating water pump, coolant pump, cooling tower, repetitive operation (3), (4), and according to optimum cold water main unit sharing of load unit are redistributed the load of each cold several main frame of operation, reach the total energy consumption minimum of each cold water main unit.
With reference to Fig. 2, Fig. 3, the technical scheme of present embodiment is substantially the same manner as Example 1, distinctive points is: the sensor that the load in the signal gathering unit is relevant comprises the temperature sensor of the evaporator water side that is installed on main frame, the temperature sensor of Water in Condenser side, the temperature sensor of evaporator refrigerant side, pressure sensor, the temperature sensor of condenser refrigerant side, pressure sensor.Described load computing unit is according to the load of the calculated signals cold water main unit of the sensor of gathering, and from the inner collecting temperature of cold water main unit, pressure value, it is more accurate that the load of cold water main unit calculates.
With reference to Fig. 2, Fig. 3, Fig. 4, the technical scheme of the cold water main unit on-site control device of central air-conditioning energy control system is identical with embodiment 2.
Existing cold water machine room, 2 1,000,000 kilocalorie screw cold water main units 1 are arranged, the operation platform number of suitably determining refrigerator according to the refrigeration duty situation makes cold satisfy burden requirement, make system works efficient height, do not make simultaneously certain cold water main unit frequent start-stop again, this is to ensureing that unit safety is reliable and energy-saving operation is significant.Fig. 4 is the operational energy efficiency figure of a certain cold water main unit, be sub-load energy consumption curve figure, abscissa is the operating load percentage of cold water main unit, and ordinate is the cold water main unit operational energy efficiency than (unit: kilowatt/standard ton), therefrom can recognize their different energy consumption characteristics.
The comparison of the energy-saving effect that the optimum cold water main unit sharing of load unit of present embodiment and existing control method are brought:
We use the screw rod machine being low to moderate operation under 14% load, but energy consumption also are maximum, reaches 1.282 kilowatts of every standard tons as can be seen from Fig. 4; When under 70% load, moving, when reaching the energy consumption minimum point, has only 0.604 kilowatt of every standard ton.
For the cold water machine room, if the refrigeration duty that system needs is 1,200,000 kilocalories, the cold allocative decision of handpiece Water Chilling Units is:
The scheme 1 of existing control method: if one 1,000,000 kilocalorie screw cooling-water machine is operated in 100% load, another 1,000,000 kilocalorie screw cooling-water machine is operated in 20% load, total Energy Efficiency Ratio is: 1.605, and then the comprehensive Energy Efficiency Ratio of two units is 0.8075.
The scheme 2 of present embodiment: according to the operating point of the setting total load in the memory cell of optimum cold water main unit sharing of load unit, each cold water main unit, the correspondence table of energy consumption, referring to table 1:
| Total load | No. 1 cold water main unit | No. 2 cold water main units | Total energy consumption | ||
| 1.2 | Load percentage | Energy Efficiency Ratio | Load percentage | Energy Efficiency Ratio | |
| 1.0 | 0.675 | 0.2 | 0.94 | 1.615 | |
| 0.9 | 0.636 | 0.3 | 0.733 | 1.369 | |
| 0.8 | 0.61 | 0.4 | 0.66 | 1.270 | |
| 0.7 | 0.604 | 0.5 | 0.627 | 1.231 | |
| 0.6 | 0.611 | 0.6 | 0.611 | 1.222 | |
| 0.5 | 0.627 | 0.7 | 0.604 | 1.231 | |
| 0.4 | 0.66 | 0.8 | 0.61 | 1.270 | |
| 0.3 | 0.733 | 0.9 | 0.636 | 1.369 | |
| 0.2 | 0.94 | 1.0 | 0.675 | 1.615 | |
Table 1
Redistribute the unit according to the cold water main unit energy consumption in the memory cell, obtaining minimum total energy consumption is 1.222, be two cooling-water machines all at 60% load operation, at this moment the comprehensive Energy Efficiency Ratio of two cooling-water machines is 0.611.
Obviously, scheme 2 is more reasonable than scheme 1, and is more energy-conservation, and scheme 2 is than scheme 1 energy-conservation 24.3%.
Claims (6)
1, a kind of cold water main unit on-site control device of central air-conditioning energy control system comprises microprocessor, and described microprocessor comprises:
One signal gathering unit is used to gather the signal that is installed on the sensor relevant with load on the central air-conditioning;
One load computing unit is used for the signal according to the sensor on the described central air-conditioning, calculates the total load of central air-conditioning;
One adds the machine unit, is used for sending start command signal to cold water main unit to be started after described total load exceeds the rated load of existing cold water main unit;
One subtracts the machine unit, is used for sending cut-off command to cold water main unit to be closed after the rated load of described total load less than existing cold water main unit;
It is characterized in that: also comprise optimum cold water main unit sharing of load unit, these allocation units comprise:
One memory cell, be used to store each operating point of described cold water main unit and the corresponding relation of energy consumption, and when the setting total load is between n platform and the specified total load of n+1 platform cold water main unit, to set total load with this and distribute to n+1 platform cold water main unit successively, set up the corresponding relation of setting total load, each cold water main unit operating point, each cold water main unit energy consumption, and set up the initial index of setting total load, wherein n is a natural number;
One once more load gauge calculate the unit, be used for add the machine unit carry out add the machine instruction or subtract the machine unit carry out subtract the machine instruction after, and calculate the total load of each current cold water main unit;
One redistributes the unit, is used for the total load that obtains according to the computing unit of loading once more, and from the initial index of memory cell, relatively the main frame energy consumption sum of each cold water main unit obtains minimum total energy consumption, and obtains the operating point of each cold water main unit,
One performance element is used for sending operating instruction according to the operating point of redistributing each cold water main unit that the unit obtains to each cold water main unit.
2, the cold water main unit on-site control device of central air-conditioning energy control system as claimed in claim 1, it is characterized in that: described microprocessor also comprises a monitoring unit, be used to gather the running state parameter of cold water main unit, the dynamic throttling instrument of central air-conditioning is to refrigerating water pump, coolant pump, the state of a control parameter of heat-exchanger pump, cold source system freezing temperature and pressure reduction for backwater, the total temperature that supplies water of cooling, each branch is freezing, the electric butterfly valve state parameter of cooling water channel, the running state parameter of end-equipment, and the standard value of each parameter and default made comparisons, optionally the alarm unit to microprocessor sends the startup alarm signal.
3, the cold water main unit on-site control device of central air-conditioning energy control system as claimed in claim 1 or 2, it is characterized in that: described sensor comprises the temperature sensor of the evaporator water side that is installed on main frame, the temperature sensor of Water in Condenser side, the temperature sensor of evaporator refrigerant side, pressure sensor, the temperature sensor of condenser refrigerant side, pressure sensor.
4, the cold water main unit on-site control device of central air-conditioning energy control system as claimed in claim 1 or 2 is characterized in that: described sensor is water supply, the temperature sensor on the return main, the flow sensor that is installed on central air-conditioning.
5, the cold water main unit on-site control device of central air-conditioning energy control system as claimed in claim 3, it is characterized in that: described microprocessor is provided with the RS-485/232 interface that carries out information communication with cold water main unit, interconnects with the daisy chain form between a plurality of RS-485/232 interfaces.
6, the cold water main unit on-site control device of central air-conditioning energy control system as claimed in claim 4, it is characterized in that: described microprocessor is provided with the RS-485/232 interface that carries out information communication with the cold water main unit communication interface, interconnects with the daisy chain form between a plurality of RS-485/232 interfaces.
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| CN115200296B (en) * | 2022-07-22 | 2023-11-03 | 富联智能工坊(郑州)有限公司 | Ice machine group control method, device, equipment and computer readable storage medium |
| CN115235050A (en) * | 2022-09-21 | 2022-10-25 | 江苏橙智云信息技术有限公司 | Simulation method and device for energy-saving strategy of central air-conditioning water chilling unit |
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