CN100523635C - Intelligent cluster control system of central air-conditioning - Google Patents
Intelligent cluster control system of central air-conditioning Download PDFInfo
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- CN100523635C CN100523635C CNB200710026954XA CN200710026954A CN100523635C CN 100523635 C CN100523635 C CN 100523635C CN B200710026954X A CNB200710026954X A CN B200710026954XA CN 200710026954 A CN200710026954 A CN 200710026954A CN 100523635 C CN100523635 C CN 100523635C
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- conditioning
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000007710 freezing Methods 0.000 claims abstract description 36
- 230000008014 freezing Effects 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 238000012545 processing Methods 0.000 claims description 21
- 239000002826 coolant Substances 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 238000010992 reflux Methods 0.000 abstract 3
- 238000005057 refrigeration Methods 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
The invention discloses a central air-conditioning intelligent group control system, comprising a host, a cooling tower, a cooling pump, a central processor, and a data collector, a cooling reflux output temperature sensor, a freezing reflux output temperature sensor, a freezing reflux output pressure sensor, a controller connected with the central processor for reading the parameters of a frequency changer via on-site bus, and a network gate between the host and the controller. The sensor is connected with the data collector which can transmit the signal of sensor to the central processor. The invention uses several parameters to group control to fully utilize frequency change technique to reduce the abundant refrigeration most. And the invention uses the controller to on-time memory the data of air conditioner, to show variable power curvatures, watched and modified by user.
Description
Technical field
The present invention relates to air-conditioning automatic control technology field, be specifically related to a kind of central air-conditioning intelligent cluster control system.
Background technology
Existing central air conditioner system is generally composed in parallel by multiple host, many refrigerating water pumps, many cooling towers, refrigerating water pump of a host configuration, coolant pump, cooling tower, wherein system mainly contains following several to the control mode of refrigerating water pump, coolant pump, cooling tower: 1, directly power frequency valve control; 2, Direct Conversion control; 3, pressure reduction VFC; 4, temperature difference VFC; 5, return water temperature control.More than five kinds of control modes all be to adopt the mode of control cooling water flow, chilled-water flow and cooling tower air quantity and main frame Automatic Optimal and reach energy-conservation effect.First kind of control mode is power frequency control, and energy-saving effect is the poorest; All the other four kinds is VFC, and energy-saving effect makes moderate progress, and control accuracy also increases, but still fails to make air-conditioning system to work in the lowest energy consumption state.
At present when using converter technique energy-conservation, open main frame, refrigerating water pump, coolant pump, cooling tower artificially, allow pump and tower do the closed loop VFC, the main frame Automatic Optimal, but there are two big drawbacks like this, first, when not enough or two cover configurations are too many when a cover configuration, want the armrest flowing mode to open or stop second cover to dispose, artificial mode of operation accuracy is limited after all, cause the air-conditioning system refrigerating capacity not enough or too many easily, thereby cause environment temperature higher or on the low side, sometimes cold and sometimes hot phenomenon occurs; Second, even under the enough situations of a cover system, existing air-conditioner control system also fail to use the fully power-saving technique of frequency conversion, i.e. flow and the relation that frequency (being the rotating speed of blower fan) is directly proportional, power is directly proportional with the cube of frequency, thereby can not accomplish that power consumption minimizes adjusting.
Summary of the invention
At the deficiencies in the prior art, the object of the present invention is to provide a kind of central air-conditioning intelligent cluster control system, this system can regulate the optimal operational condition of air-conditioning system in real time, realizes maximum energy-conservation adjusting.
The present invention adopts following technical scheme to realize above-mentioned purpose: a kind of central air-conditioning intelligent cluster control system, comprise air-conditioner host, cooling tower, coolant pump, central processing unit, data acquisition unit, and it is characterized in that also comprising:
The cooling backwater temperature sensor is arranged at the cooling back on the water pipe of air-conditioning system;
Cooling leaving water temperature sensor is arranged on the cooling outlet pipe of air-conditioning system;
Freezing return water temperature sensor is arranged on the freezing return pipe;
Freezing leaving water temperature sensor is arranged on the freezing outlet pipe;
Freezing pressure of return water sensor is arranged on the freezing return pipe;
Freezing discharge pressure sensor is arranged on the freezing outlet pipe;
Least favorable is put freezing Inlet and outlet water temperature and pressure transmitter, is provided with on the terminal blower fan water inlet pipe and water outlet pipe;
Industrial computer is connected with central processing unit, also monitors the parameter of frequency converter by fieldbus;
Be connected in the gateway between air-conditioner host and the industrial computer;
Described sensor is connected with data acquisition unit, and the signal of sensor being gathered by data acquisition unit is uploaded to central processing unit.
Above-mentioned industrial computer also has Golden Customs software, supports the OPC interfacing.
Above-mentioned central air-conditioning intelligent cluster control system also comprises the chilled water flow quantity sensor that is arranged on the freezing outlet pipe.
Also be provided with the power detector that is connected with data acquisition unit on the above-mentioned air-conditioner host.
Above-mentioned central air-conditioning intelligent cluster control system also comprises the remote monitoring computer that is connected with industrial computer.
Adopt single parameter control to compare with prior art, the present invention adopts the mode of a plurality of parameter team controls, more can reasonably calculate best air conditioner operation parameters, makes full use of converter technique, and the surplus capacity of air conditioner refrigerating is reduced to minimum; The present invention adopts industrial computer in time to store the service data of air-conditioning system in addition, and form various power curve and shown, the user can check air-conditioning system history log and current operational factor by industrial computer, can also on industrial computer, revise air conditioner operation parameters according to the actual requirements, parameter be transferred to central processing unit by industrial computer.
Description of drawings
Fig. 1 is central air-conditioning structure of the present invention and sensing station schematic diagram;
Fig. 2 is a group control circuit module diagram of the present invention.
The specific embodiment
Be example with the central air conditioner system that comprises three main frames, three cooling towers now, the invention will be further described in conjunction with Figure of description:
As shown in Figure 1, the present invention adds a plurality of sensors in original central air conditioner system the inside, is respectively: cooling backwater temperature sensor 1 is arranged at the cooling back on the water pipe of air-conditioning system; Cooling leaving water temperature sensor 2 is arranged on the cooling outlet pipe of air-conditioning system; Freezing return water temperature sensor 3 is arranged on the freezing return pipe; Freezing leaving water temperature sensor 4 is arranged on the freezing outlet pipe; Freezing pressure of return water sensor 5 is arranged on the freezing return pipe; Freezing discharge pressure sensor 6 is arranged on the freezing outlet pipe; Chilled water flow quantity sensor 7 is arranged on the freezing outlet pipe, and the arrow of Fig. 1 is a water (flow) direction.In addition, on air-conditioner host 19, also add power detector 13 and gateway 12.Outdoor temperature sensor 8 among Fig. 1 is arranged at the Air Conditioning Facilities outside, is used to detect outdoor environment temperature; Terminal return water temperature sensor 9, terminal intake pressure sensor 10 and terminal discharge pressure sensor 11 then are arranged on the blower fan of least favorable point in the air-conditioning system, are used to gather the working state signal of least favorable point blower fan.Here " least favorable point " refers to the not good enough place of operational factor in the system equipment, such as the air-conditioning draught fan of distal-most end.Add sensor at the least favorable point, can make the data of collection more accurate, comprehensive.
Cooling backwater temperature sensor 1, cooling leaving water temperature sensor 2, freezing return water temperature sensor 3, freezing leaving water temperature sensor 4, freezing pressure of return water sensor 5, freezing discharge pressure sensor 6, chilled water flow quantity sensor 7, outdoor temperature sensor 8, terminal return water temperature sensor 9, terminal intake pressure sensor 10, terminal discharge pressure sensor 11 and power detector 13 are connected to central processing unit by data acquisition unit, be uploaded to central processing unit as shown in Figure 2, and with signals such as the temperature that collects, pressure, discharges.
As shown in Figure 2, central processing unit is connected with cooling tower inlet valve 14, cooling tower flowing water Valve 15, main frame cooling tower inlet valve 18, air-conditioner host 19 and main frame cooling tower flowing water Valve 20 by the I/O unit.Central processing unit just can read the control model of air-conditioner host 19 by the I/O unit like this, such as being Long-distance Control, and still automatically local or local manually control; Whether central processing unit also can be learnt the duty of each valve quickly by the I/O unit, break down etc., and give each valve by I/O unit transmission control instruction.Connected mode and control mode that central authorities handle by I/O unit and each equipment are prior art, do not repeat them here.
As shown in Figure 2, central processing unit is connected with the Energy Saving Control unit by analog quantity output unit and I/O unit, and this Energy Saving Control unit mainly is made of frequency converter, and its output is connected with blower fan of cooling tower 16, coolant circulation pump 17 and freeze cycle pump 21.Central processing unit is opened corresponding blower fan of cooling tower, coolant circulation pump and freeze cycle pump by the unlatching platform number of I/O unit to Energy Saving Control unit input blower fan of cooling tower, coolant circulation pump and freeze cycle pump by the Energy Saving Control unit; By power and the frequency of analog quantity output unit to Energy Saving Control unit input converter, thus the operational factor of control blower fan of cooling tower, coolant circulation pump and freeze cycle pump, and then the refrigerating capacity of control air-conditioning system.
Industrial computer is connected with remote monitoring computer, gateway 12, central processing unit and Energy Saving Control unit, as shown in Figure 2.Industrial computer is gathered the signal parameter of apparatus operating parameters such as coolant pump, refrigerating water pump and cooling tower and each sensor by central processing unit, and be connected to power, the frequency parameter that frequency converter is gathered in the Energy Saving Control unit by fieldbus, read the data of air-conditioner host again by gateway 12, then these data are stored, and form various data and curves and shown that the user also can carry out the parameter setting by industrial computer.In addition, industrial computer also can be used as server, supports the Internet agreement, is connected with the remote monitoring computer, makes the long-distance user can know the various parameters and the ruuning situation of air-conditioning system by terminal computer, and can carry out the modification of parameter by terminal computer.Industrial computer also comprises the OPC interface unit, and central air conditioner system can be connected to the air-conditioning system of other building by this interface unit, realizes that the operational factor and the historical data of the air-conditioning system of several buildings building converges at same industrial computer, more convenient user's centralized management.
The course of work of the present invention is as follows:
1. air-conditioner host is opened the control of platform number
Central processing unit reads the detection data of each sensor, parameters of electric power (as electric current, power) with cooling leaving water temperature, cooling inflow temperature, freezing leaving water temperature, freezing inflow temperature, chilled-water flow and air-conditioner host is judgement, when main frame unlatching platform number is not enough, restart a main frame by the I/O unit; When refrigerating capacity is too many, just stops principle earlier and close a main frame, so circular flow according to startup earlier.Can temperature and the parameters of electric power that air-conditioner host starts and stops to be set by software, to avoid the air-conditioner host frequent start-stop.
2. coolant pump, refrigerating water pump, cooling tower VFC
In the temperature range of the high-effect requirement of main frame, central processing unit adopts return water temperature to control; Outside the temperature range of the high-effect requirement of main frame, adopt backwater and leaving water temperature to control; Make full use of converter technique, promptly frequency be directly proportional with flow, cube relation that is directly proportional of power and frequency.
Carry out the coolant pump ratio according to the cooling backwater temperature and regulate VFC, promptly
f
Requirement=(f
On-f
Down)/(t
On-t
Down) * (t
Actual-t
Down)+f
Down
f
Requirement-the frequency that requires frequency converter to export
f
On-setpoint frequency the upper limit (can reduce the design surplus capacity)
f
Down-setpoint frequency lower limit (can satisfy pressure and motor characteristic feature)
t
On-design temperature the upper limit (satisfying host performance)
t
Down-design temperature lower limit (satisfying host performance)
t
Actual-actual temperature
f
Actual-allow the frequency of the actual output of frequency converter
When system is coolant pump of the independent configuration of a main frame, just carries out ratio and regulate, be i.e. f in this
Actual=f
RequirementWhen system when to be that many coolant pumps are in parallel supplies water for multiple host, the mode of employing just is different from the front mode, and will fully experience the energy-conservation superiority of its converter technique this moment, and when a main frame operation, return water temperature is low, with regard to the ratio adjusting f in the front
Actual=f
Requirement, when return water temperature is high, just adopt two coolant pumps energy-conservation low-frequency operation simultaneously, concrete calculating meets the following conditions and gets final product: 2 (f
Actual)
3＜f
Requirement 3, to allow computer calculate out several coolant pumps and frequency separately automatically be what just can make the energy saving space bigger by calculating, when two main frames operations, adopts the water supply in parallel of three coolant pumps, i.e. 3 (f
Actual)
3＜2f
Requirement 3, just can draw under certain temperature, how to come for cooling water, adopt the precondition of the method to be: satisfy main frame cooling this moment output, fully take away heat, this moment uses flow and frequency is proportional.
Refrigerating water pump, cooling tower in like manner adopt the mode of above coolant pump frequency adjustment to control operating frequency.
Industrial computer from central processing unit and Energy Saving Control unit, gateway reads the operational factor of air-conditioning system, and data stored, and is depicted as various curves, as frequency, electric current, voltage, power and the temperature, pressure etc. of operation.Industrial computer is display system dynamic menu, report data not only, and when system equipment breaks down, but also the warning reminding user carries out the inspection and maintenance of equipment.The user not only can check and print various data and curves by industrial computer, can also carry out the setting and the modification of air conditioner operation parameters.The remote monitoring computer can be connected to industrial computer, makes the user carry out long-range authority monitoring.
Claims (5)
1. a central air-conditioning intelligent cluster control system comprises air-conditioner host, cooling tower, coolant pump, central processing unit, data acquisition unit, it is characterized in that also comprising:
The cooling backwater temperature sensor is arranged at the cooling back on the water pipe of air-conditioning system;
Cooling leaving water temperature sensor is arranged on the cooling outlet pipe of air-conditioning system;
Freezing return water temperature sensor is arranged on the freezing return pipe;
Freezing leaving water temperature sensor is arranged on the freezing outlet pipe;
Freezing pressure of return water sensor is arranged on the freezing return pipe;
Freezing discharge pressure sensor is arranged on the freezing outlet pipe;
Industrial computer is connected with central processing unit;
Be connected in the gateway between air-conditioner host and the industrial computer;
Described sensor is connected with data acquisition unit, the signal of sensor being gathered by data acquisition unit is uploaded to central processing unit, the signal that central processing unit is gathered according to sensor judges whether main frame is opened the platform number enough, when not enough, restart one, when refrigerating capacity is too many, stop principle earlier and close a main frame according to startup earlier;
Described industrial computer is gathered coolant pump and the running parameter of cooling tower and the signal parameter of sensor by central processing unit, reads the parameter of frequency converter by fieldbus, also reads the data of air-conditioner host by gateway; Then above-mentioned data are stored, and formation kind of a data and curves is shown.
2. central air-conditioning intelligent cluster control system according to claim 1 is characterized in that: described industrial computer also is provided with the OPC interface unit.
3. central air-conditioning intelligent cluster control system according to claim 1 is characterized in that: also comprise the chilled water flow quantity sensor that is arranged on the freezing outlet pipe.
4. central air-conditioning intelligent cluster control system according to claim 1 is characterized in that: also be provided with the power detector that is connected with data acquisition unit on the described air-conditioner host.
5. central air-conditioning intelligent cluster control system according to claim 1 is characterized in that: also comprise the remote monitoring computer that is connected with industrial computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710026954XA CN100523635C (en) | 2007-02-14 | 2007-02-14 | Intelligent cluster control system of central air-conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710026954XA CN100523635C (en) | 2007-02-14 | 2007-02-14 | Intelligent cluster control system of central air-conditioning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101017021A CN101017021A (en) | 2007-08-15 |
| CN100523635C true CN100523635C (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200710026954XA Expired - Fee Related CN100523635C (en) | 2007-02-14 | 2007-02-14 | Intelligent cluster control system of central air-conditioning |
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| CN115076802B (en) * | 2022-07-26 | 2022-11-01 | 蘑菇物联技术（深圳）有限公司 | Cryogenic freeze protection method, computing device and medium for refrigeration system |
| CN115355731B (en) * | 2022-08-19 | 2024-05-03 | 广东工业大学 | Energy-saving control device and control method for cooling tower |
| CN116951679B (en) * | 2023-07-18 | 2025-03-14 | 青岛飞奕科技有限公司 | System and method for collecting remote data of air conditioner of standardized water system |
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