CN203396028U - Power-saving system of central air conditioner - Google Patents
Power-saving system of central air conditioner Download PDFInfo
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- CN203396028U CN203396028U CN201320252196.4U CN201320252196U CN203396028U CN 203396028 U CN203396028 U CN 203396028U CN 201320252196 U CN201320252196 U CN 201320252196U CN 203396028 U CN203396028 U CN 203396028U
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- cooling
- power
- central air
- air conditioner
- water pumps
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Abstract
The utility model puts forward a power-saving system of a central air conditioner. The power-saving system comprises a PLC control adjusting unit, a cooling pump set composed of two cooling water pumps and a refrigeration pump set composed of two refrigeration water pumps. Cooling frequency converters are arranged between the cooling pump set and the PLC control adjusting unit and are used by the two cooling water pumps for switching. Refrigeration frequency converters are arranged between the refrigeration pump set and the PLC control adjusting unit and are used by the two refrigeration water pumps for switching. Frequency conversion power saving transformation is carried out to the cooling water pumps and the refrigeration water pumps by the power-saving system of the central air conditioner so that a good power-saving effect is exerted.
Description
Technical field
The present invention relates to field of central air-conditioning, relate in particular to a kind of energy-saving system of central air conditioner.
Background technology
At present, the unit such as most of hospitals, hotel, restaurant, office building, market all adopts central air conditioner system to regulate indoor temperature summer.Building economize on electricity has become the key subjects of environmental protection economize on electricity! According to national standard, the maximum load capability of central air conditioner system is according to maximum temperature, and the maximum working environment of loading designs, with regard to central air conditioner system itself, exist the very large energy saving space, and in fact system is seldom worked under full load condition.
According to statistics, in summer, the power consumption of central air conditioner system accounts for 60% of user's total power consumption, and central air conditioner system, as long as reduce power consumption 10%, just can reduce user 6% energy cost.According to on-the-spot actual test, the operation of fluctuate below 70% load of the time of central air conditioning equipment 90%, is less than equipment at full capacity so actual average is loaded, and particularly, in the less situation of cold air demand, main frame actual load amount is just lower.Two water circulation systems that so just make air-conditioning unit are the phenomenon in " the large little temperature difference of flow " for a long time, and a large amount of electric energy is wasted.Cause the contradiction between actual needs load and maximum power output, cause huge electric cost expenditure to central air-conditioning applying unit, increased operation cost.So, for the power-saving Retrofit Neng Wei unit of operation of central air conditioner system, create significant benefit.
The workflow of the central air conditioner system that represents prior art is as shown in Figure 1 as follows:
(1) after central air-conditioning starts, freezing unit work, the heat in evaporimeter absorption refrigerating water, makes it temperature and reduces; Meanwhile, condenser release heat raises cooling water temperature.
(2) fallen warm chilled water and pressurizeed and sent into chilled water pipeline by refrigerating water pump, in each room, by indoor fan acceleration heat exchange, the heat of taking away in room makes, after the temperature reduction in room, to flow back to again freezing water end (W.E.).
(3) risen warm cooling water and be pressed into cooling tower by coolant pump, by blower fan of cooling tower, accelerated the dissipation of heat in cooling water, in atmosphere, after water temperature is reduced, to flow back to the cooling water end (W.E.) of central air conditioner main machine.
(4) after freezing unit work a period of time, reach design temperature, by temperature sensor, detected, and by auxiliary reclay and contactor, control freezing unit and quit work, temperature recovery is controlled again its operation after certain value.
Yet there are the following problems for the central air conditioner system of prior art:
(1) chilled water, cooling water circulating pump can not be adjusted internal circulating load according to the actual requirements, and motor working efficiency is low, causes a large amount of power wastages.
(2) circulating pump starting current is large, can cause pump shaft damage, reduces motor service life.
(3) circulating pump system operation noise is large, and the water hammer producing during termination of pumping can damage pipeline and water pump, has increased system maintenance cost.
(4) blower fan of cooling tower is always in full speed running, the cooling water temperature most of the time of flowing back to central air conditioner main machine is significantly less than the water temperature that main frame requires, so not only cause electricity consumption waste, and because blower fan full speed running wind speed is compared with causing cooling water evaporation excessive greatly, to supplement a large amount of demineralized waters every day like this, cause the waste of water resource.
(5) air-conditioning box blower fan, always in full speed running, causes a large amount of waste of energy.
Summary of the invention
For the deficiencies in the prior art, the utility model proposes a kind of energy-saving system of central air conditioner, comprise: PLC control and regulation unit, the coolant pump group being formed by 2 cooling water pumps and the refrigerating water pump group being formed by 2 chilled water pumps, between described coolant pump group and described PLC control and regulation unit, cooling frequency converter is set, described cooling frequency converter switches for described 2 cooling water pumps; Between described refrigerating water pump group and described PLC control and regulation unit, freezing frequency converter is set, described freezing frequency converter switches for described 2 chilled water pumps.
The energy-saving system of central air conditioner the utility model proposes compared with prior art, has carried out frequency conversion power saving transformation to cooling water pump and chilled water pump, thereby reaches good power savings.
Accompanying drawing explanation
Fig. 1 is the overall structure figure of the central air conditioner system of prior art.
Fig. 2 is the structure chart of the energy-saving system of central air conditioner that the utility model proposes.
Fig. 3 is for being used the power savings figure of the energy-saving system of central air conditioner the utility model proposes.
The specific embodiment
The utility model proposes a kind of energy-saving system of central air conditioner, as shown in Figure 2, comprise: PLC control and regulation unit, the coolant pump group being formed by 2 cooling water pumps and the refrigerating water pump group being formed by 2 chilled water pumps, between described coolant pump group and described PLC control and regulation unit, cooling frequency converter is set, described cooling frequency converter switches for described 2 cooling water pumps; Between described refrigerating water pump group and described PLC control and regulation unit, freezing frequency converter is set, described freezing frequency converter switches for described 2 chilled water pumps.
This programme installs additional on the basis that retains former power frequency system, and between former power frequency system, only arrange chain to guarantee system works safety,, between described cooling frequency converter and described coolant pump group, be provided with cooling power frequency system, between described freezing frequency converter and described refrigerating water pump group, be provided with freezing power frequency system, between cooling power frequency system and freezing power frequency system, arrange chain.Backwater in cooling water recirculation system and leaving water temperature poor, reflects that how many ，Yu room refrigeration that pipeline absorbs heat are directly proportional; According to the speed of the difference controlled circulation water of backwater and leaving water temperature, so the speed of control heat exchange, meeting under the prerequisite of system cools needs, reach the object of economize on electricity.The heat that the freezing unit of the large explanation of the temperature difference produces is large, should improve the rotating speed of coolant pump, accelerates cooling water circulation speed; Have a narrow range of temperature, illustrate that the heat of freezing unit generation is little, can reduce the rotating speed of coolant pump, to save electric energy.Coolant pump adopts transducer drive, and two coolant pumps are standby each other, and Programmable Logic Controller (PLC) is controlled transducer drive motor rotation.Therefore in refrigerating circulation system, because leaving water temperature is more stable, only return water temperature is just enough to react the temperature in room, so PLC can control according to return water temperature.Return water temperature is high, illustrates that room temperature is high, should improve refrigerating water pump rotating speed, accelerates the circulation of chilled water; Otherwise the low explanation room temperature of return water temperature is low, can reduce the rotating speed of refrigerating water pump, reduce the circulation rate of chilled water, to realize economize on electricity object (its control procedure is similar with the coolant pump circulatory system).
Operation principle from Fluid Transport equipment water pump, blower fan: the flow of water pump, blower fan (air quantity) is directly proportional to its rotating speed; Square being directly proportional of the pressure of water pump, blower fan (lift) and its rotating speed, and the shaft power of water pump, blower fan equals the product of flow and pressure, therefore the shaft power of water pump, blower fan and the cube of its rotating speed are directly proportional, (being directly proportional to the cube of supply frequency) is as shown in table 1:
Table 1
Known according to above-mentioned principle: the rotating speed that changes water pump, blower fan just can change the power of water pump, blower fan.For example: frequency of supply is reduced to 45Hz by 50Hz, P
45/ P
50=45
3/ 50
3=0.729, i.e. P
45=0.729P
50(P is motor shaft power); Frequency of supply is reduced to 40Hz by 50Hz, P
40/ P
50=40
3/ 50
3=0.512, i.e. P
40=0.512P
50(P is motor shaft power).Frequency conversion power saving effect as shown in Figure 3.
According to Fig. 3, can find out, while carrying out flow (air quantity) control with frequency converter, can save a large amount of electric energy.Central air conditioner system is considered by the maximum refrigeration requirement in scene when design, its coolant pump, and refrigerating water pump considers there is in actual use the time more than 90% by the maximum duty of single device, coolant pump, refrigerating water pump are all operated under undercapacity state.As adopt valve, automatic valve adjust flux not only to increase pipe loss, and owing to being interim to the adjusting of air-conditioning, cause whole air-conditioning system to be operated in fluctuation status; By attached with frequency converters on coolant pump, refrigerating water pump, can once and for all address this problem, also can realize automatic control, and can recoup capital outlay by frequency conversion power saving.The soft start function of frequency converter and the feature of stepless speed control can realize the steady adjusting to system simultaneously, make working state of system stable, and extend the service life of unit and webmaster.
Analyze now the principle that freezing, cooling recirculation system economizes on electricity.Now suppose that certain water circulating pump changes VFC into, average discharge is original 0.8; Now analyze economize on electricity situation.
Power saving rate=(W
originally-W
economize on electricity)/W
originally* 100%=(1-W
economize on electricity/ W
originally) * 100%
Note: W=P * T; P=Q * H; Q=K
1* n; H=K
2* n
2;
P＝K
1×K
2×n
3＝K
0×n
3；
T
economize on electricity=T
originally;
Power saving rate=(1-P
economize on electricity/ P
originally) * 100%
=[1-(n
economize on electricity/ n
originally)
3] * 100%
＝[1-(0.8)
3]×100％
＝48.8％≈49％；
Wherein each parameter is defined as follows:
W: merit, i.e. water pump institute consumes power; P: power; T: time; Q: flow; H: lift; N: rotating speed; K
1: coefficient; K
2: coefficient; K
0: coefficient.
The performance of the energy-saving system of central air conditioner the utility model proposes is as follows:
1, efficient electricity-saving: for the variable torques such as blower fan, water pump, according to the experience of accumulation, the average power saving rate after air-conditioning system blower fan, water pump application electricity-saving control system is 30%-50%.
2, operation is succinct: can, according to parameters such as the measuring point temperature of sensor feedback, water temperature difference, pipeline pressure, flows, realize closed loop automatically to control; Be furnished with touch-screen and show air-conditioning relevant parameter, operation brevity and lucidity, alleviates operation monitoring personnel's labour intensity.
3, performance is comprehensive: possess alarm indication function, overvoltage, overcurrent, phase shortage, sensor fault are carried out to controlling alarm.
4, life-extending: after application central air-conditioning electricity-saving control system, the start and stop of motor have realized soft start and soft stop, without suddenly opening and all standing phenomenon, greatly reduce machinery and electrical network and impact; Can extend the service life of water pump, blower fan pipe fitting and air-conditioning equipment, reduce maintenance cost.
5, safe and reliable: system core parts adopt famous brand name product, and are provided with bypass, power-saving running switched system, have improved property safe and reliable to operation, form redundancy back-up system with the original adjusting device of system, guarantee the normal use of central air conditioner system.
6, simple installation: be specially adapted to legacy system power-saving Retrofit.To existing air-conditioning unit, pipeline without changing, to blower fan water pump without specific (special) requirements; Needn't increase and change former water, wind pipeline system.
7, blower fan of cooling tower, regulates wind speed according to cooling water return water temperature, not only saves a large amount of electric energy but also can reduce in a large number the rate of water make-up of cooling water circulation.
Claims (2)
1. an energy-saving system of central air conditioner, comprise PLC control and regulation unit, the coolant pump group being formed by 2 cooling water pumps and the refrigerating water pump group being formed by 2 chilled water pumps, it is characterized in that: between described coolant pump group and described PLC control and regulation unit, cooling frequency converter is set, described cooling frequency converter switches for described 2 cooling water pumps; Between described refrigerating water pump group and described PLC control and regulation unit, freezing frequency converter is set, described freezing frequency converter switches for described 2 chilled water pumps.
2. energy-saving system of central air conditioner as claimed in claim 1, it is characterized in that, between described cooling frequency converter and described coolant pump group, be provided with cooling power frequency system, between described freezing frequency converter and described refrigerating water pump group, be provided with freezing power frequency system, between described cooling power frequency system and described freezing power frequency system, arrange chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320252196.4U CN203396028U (en) | 2013-04-14 | 2013-04-14 | Power-saving system of central air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320252196.4U CN203396028U (en) | 2013-04-14 | 2013-04-14 | Power-saving system of central air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN203396028U true CN203396028U (en) | 2014-01-15 |
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ID=49907556
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|---|---|---|---|
| CN201320252196.4U Expired - Fee Related CN203396028U (en) | 2013-04-14 | 2013-04-14 | Power-saving system of central air conditioner |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879992A (en) * | 2015-03-26 | 2015-09-02 | 上海大众祥源动力供应有限公司 | Energy-saving water supply system based on automatic heat exchange |
| CN105066376A (en) * | 2015-09-07 | 2015-11-18 | 郑州大学综合设计研究院有限公司 | Artificial cold source intelligent control system of building structure |
| CN106026792A (en) * | 2016-05-26 | 2016-10-12 | 江苏省冶金设计院有限公司 | Power frequency and variable frequency operation switching control device for three working air blowers and two standby air blowers |
| CN114909771A (en) * | 2022-05-09 | 2022-08-16 | 南京亚派软件技术有限公司 | Air conditioner cooling water operation control system |
-
2013
- 2013-04-14 CN CN201320252196.4U patent/CN203396028U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879992A (en) * | 2015-03-26 | 2015-09-02 | 上海大众祥源动力供应有限公司 | Energy-saving water supply system based on automatic heat exchange |
| CN104879992B (en) * | 2015-03-26 | 2017-11-03 | 上海大众祥源动力供应有限公司 | A kind of energy-saving water supply system based on automatic heat exchange |
| CN105066376A (en) * | 2015-09-07 | 2015-11-18 | 郑州大学综合设计研究院有限公司 | Artificial cold source intelligent control system of building structure |
| CN106026792A (en) * | 2016-05-26 | 2016-10-12 | 江苏省冶金设计院有限公司 | Power frequency and variable frequency operation switching control device for three working air blowers and two standby air blowers |
| CN114909771A (en) * | 2022-05-09 | 2022-08-16 | 南京亚派软件技术有限公司 | Air conditioner cooling water operation control system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20140414 |