CN104006980A - Testing device capable of analyzing cooling tower performance in real time in online mode - Google Patents
Testing device capable of analyzing cooling tower performance in real time in online mode Download PDFInfo
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- CN104006980A CN104006980A CN201410216508.5A CN201410216508A CN104006980A CN 104006980 A CN104006980 A CN 104006980A CN 201410216508 A CN201410216508 A CN 201410216508A CN 104006980 A CN104006980 A CN 104006980A
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Abstract
The invention discloses a testing device capable of analyzing cooling tower performance in real time in an online mode. The testing device comprises a PC machine, a sound level meter, an ultrasonic flower meter, a collecting module and a collecting device, wherein the collecting device is connected to the collecting module, the collecting module is connected with the PC machine through an RS484 to transmit data, and the sound level meter and the ultrasonic flow meter are directly connected with the PC machine through RS232s to transmit data. The testing device can guarantee accuracy and effectiveness of data, reduces labor and material resources to the maximum degree and meanwhile can comprehensively evaluate the cooling tower performance in real time.
Description
Technical field
The present invention relates to cooling tower performance tester, relate in particular to a kind of cooling tower performance tester of on-line analysis.
Background technology
The design selection of cooling tower is often selected according to the cooling power under cooling tower standard condition, and the running environment of actual cooling tower is because limited space and climatic characteristic have all departed from standard condition, add impact and the noise elimination noise reduction measure of dirtiness resistance, cooling tower cooling power is had a greatly reduced quality.Cooling tower operation quality is not only related to the cooling power of cooling tower itself, and is related to the runnability of whole air-conditioning system.Therefore, the performance test work of cooling tower, be research and development and raising cooling tower product quality, and Proper Match main process equipment provides the technical parameter of actual measurement, the normal operation to whole system and energy-saving and cost-reducing all important in inhibitings.
At present, mainly there is following difficult point in cooling tower performance test:
1) on-the-spot test difficulty is high.Because cooling tower is tested required manpower and materials greatly and longevity of service, often ignore cooling tower performance is tested both at home and abroad.In most cases only have producer before dispatching from the factory, cooling tower simply to be tested under standard condition, because cooling tower is direct and environmental exposure, actual condition many times departs from standard condition, therefore be easy to appear at cooling tower cooling power under standard condition and can reach cooling requirement, but in actual motion, cannot meet the situation of cooling requirement.
2) testing apparatus cannot meet test request.Cooling tower is exposed in environment, and the variation of ambient condition parameter can cause the variation of cooling tower operational factor, and people often ignore this point, and the response time of the testing apparatus of selecting is very long, causes acquisition parameter to lag behind; Cooling tower air-out state is hot and humid, if the Temperature Humidity Sensor non-refractory high humidity of selecting can cause sensor to use and malfunctioningly after a period of time even burn, the data precision collecting also cannot ensure; In on-the-spot test process, Temperature Humidity Sensor can be subject to the impact of solar radiation, if do not take sunshade measure, the temperature collecting is the temperature of air intake and solar radiation combined action, thereby causes test result higher.
3) test is difficult to reach synchronism and high density.Cooling tower performance test parameter comprises the parameter of tower own and environmental parameter, and the outer common testing methods of Current Domestic is distributed in different measuring points synchronous acquisition tower operational factor by many people while being test.This method is difficult to the each parameter acquisition synchronism of guarantee and tests for a long time continuously, and the reliability of test parameter is also difficult to ensure simultaneously, thereby causes measuring unit to be difficult to the cooling tower performance of actual motion to carry out objective rational evaluation.
4) performance evaluation is comprehensive not.Many cooling tower performance tests both at home and abroad only go out measured calculation of parameter cooling number and the cooling power of cooling tower, and ignore analyze tower reflux ratio, gas-water ratio affects it, and the distribution of coolant-temperature gage field at the bottom of cooling tower air inlet/outlet humiture field, tower, more do not draw Lewis number and the packing property correction factor of tower, these two coefficients are important parameters evaluating the heat exchange sophistication of tower.
Therefore the cooling tower performance tester that exploitation has high precision and an on-line analysis is necessary.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of cooling tower performance tester of on-line analysis is provided, solve the technical matterss such as current cooling tower performance test precision is inadequate, data are not comprehensive.
The present invention is achieved through the following technical solutions:
A cooling tower performance tester for on-line analysis, comprises PC 101, sound meter 102, ultrasonic flow meter 103, acquisition module cabinet 104 and harvester 105;
Wherein, harvester 105 is connected to acquisition module cabinet 104, and then acquisition module cabinet 104 is connected to PC 101 by RS484 communication and carries out data transmission; Sound meter 102 and ultrasonic flow meter 103 are directly connected to PC 101 by RS232 communication and carry out data transmission.
Described acquisition module cabinet 104 inside comprise that AC220V turns DC24V transformer 109, leakage switch 110, humiture collection module group 106, thermocouple acquisition module group 107, wind speed acquisition module 108;
In described humiture collection module group 106, each humiture collection inside modules contains power interface 602, data-out port 603 and gathers port 601;
In described thermocouple acquisition module group 107, each humiture collection inside modules contains power interface 702, data-out port 703 and gathers port 701;
Described wind speed acquisition module 108 inside are contained power interface 802, data-out port 803 and are gathered port 801;
After the power interface of described thermocouple acquisition module 107, humiture collection module group 106 and wind speed acquisition module 108 is parallel with one another, be connected to AC220V and turn DC24V transformer 109, AC220V turns DC24V transformer 109 and is connected to leakage switch 110, and leakage switch 110 is connected to 220V outlet;
After the data-out port of described thermocouple acquisition module 107, humiture collection module group 106 and wind speed acquisition module 108 is parallel with one another, be connected to RS485 converter 111, then RS485 converter 111 is connected to portable PC 101 and carries out data transmission.
Described harvester 105 includes Temperature Humidity Sensor group 113; Each Temperature Humidity Sensor in Temperature Humidity Sensor group 113 contains three group interfaces, and this three group interface is respectively temperature interface 201, humidity interface 202 and power interface 203; This three group interfaces unification surpasses five class netting twines with one and joins, and end is with crystal head 116;
In humiture collection module group 106 in each humiture collection module, every two collection ports are one group, be respectively temperature acquisition port 601-2 and humidity collection port 601-1, two gather that port and power interface 602 is unified to be surpassed five class netting twines with one and join, and end is with crystal head 116; Two crystal heads pack into respectively connector 117 realizations and are connected, and Temperature Humidity Sensor 113 and humiture collection module group 106 are coupled together and carry out data acquisition.
Described harvester 105 includes air velocity transducer group 115; In air velocity transducer group 115, each air velocity transducer contains two group interfaces, and to be respectively that wind speed interface 301 and power interface 302, two group interfaces are unified surpass five class netting twines with one and join this two group interface, and end is with crystal head 116;
In wind speed acquisition module 108, one gathers that port 801-1 and power interface 802 is unified to be surpassed five class netting twines with one and join, end is with crystal head 116, two crystal heads pack into respectively connector realization and are connected, and air velocity transducer 115 and wind speed acquisition module 108 are coupled together and carry out data acquisition.
Described harvester 105 also includes thermopair group 114; Thermopair group 114 is directly connected to the collection port 701 of a thermocouple acquisition module in thermocouple acquisition module group 107.
The present invention, with respect to prior art, has following advantage and effect:
This device adopts high-temp resisting high-humidity resisting and short Temperature Humidity Sensor and air velocity transducer of response time, and the equipment that ensured can be at long-time steady operation under super-humid conditions; And adopt sunshading board measure to reduce the impact of solar radiation on Temperature Humidity Sensor collecting temperature; By PC (portable) automatic storage data, each data acquisition interval only has 2s, and ambient temperature and humidity and wind speed and cooling tower performance parameter gather simultaneously, has ensured synchronism and the continuity of test.
This device can collect the parameters such as chilled water water temperature at the bottom of cooling tower air intake humiture, air intake wind speed, air-out humiture, air-out wind speed, tower, turnover tower cooler water water temperature, cooling tower buzz, cooling tower water flow, ambient temperature and humidity and ambient wind velocity, thus performance that can thoroughly evaluating cooling tower; The data that the upper test software platform of PC (portable) by this device can autostore collects, whether the each acquisition module operation of Real-Time Monitoring is simultaneously normal and whether each parameter is accurate and the real-time change curve of each parameter, get rid of extremely, thereby ensured data accuracy; By the upper performance evaluation platform of PC (portable), can online calculate the cooling tower air inlet/outlet air enthalpy of different time sections, surrounding air enthalpy, intake volume, cooling number and cooling power, and present cooling tower turnover aerial temperature and humidity field and wind speed field, coolant-temperature gage field at the bottom of tower.Finally go out Lewis number and the packing property correction factor of cooling tower by the cooling tower parameter fitting of multiple time periods.
Brief description of the drawings
Fig. 1 is the structural representation of proving installation of the present invention.
Fig. 2 is proving installation acquisition module of the present invention (or acquisition module cabinet) structural representation.
Fig. 3 is the humiture collection module of proving installation of the present invention and the connection diagram of Temperature Humidity Sensor.
Fig. 4 is the wind speed acquisition module of proving installation of the present invention and the connection diagram of air velocity transducer.
Embodiment
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figures 1 to 4.The cooling tower performance tester of on-line analysis of the present invention, comprises PC 101, sound meter 102, ultrasonic flow meter 103, acquisition module cabinet 104 and harvester 105;
Wherein, harvester 105 (by surpassing five class netting twines) is connected to acquisition module cabinet 104, and then acquisition module cabinet 104 is connected to PC 101 by RS484 communication and carries out data transmission; Sound meter 102 and ultrasonic flow meter 103 are directly connected to PC 101 by RS232 communication and carry out data transmission.
Described acquisition module cabinet 104 inside comprise that AC220V turns DC24V transformer 109, leakage switch 110, humiture collection module group 106, thermocouple acquisition module group 107, wind speed acquisition module 108;
In described humiture collection module group 106, each humiture collection inside modules contains power interface 602, data-out port 603 and gathers port 601;
In described thermocouple acquisition module group 107, each humiture collection inside modules contains power interface 702, data-out port 703 and gathers port 701;
Described wind speed acquisition module 108 inside are contained power interface 802, data-out port 803 and are gathered port 801;
After the power interface of described thermocouple acquisition module 107, humiture collection module group 106 and wind speed acquisition module 108 is parallel with one another, be connected to AC220V and turn DC24V transformer 109, AC220V turns DC24V transformer 109 and is connected to leakage switch 110, and leakage switch 110 is connected to 220V outlet;
After the data-out port of described thermocouple acquisition module 107, humiture collection module group 106 and wind speed acquisition module 108 is parallel with one another, be connected to RS485 converter 111, then RS485 converter 111 is connected to portable PC 101 and carries out data transmission.
Described harvester 105 includes Temperature Humidity Sensor group 113; Each Temperature Humidity Sensor in Temperature Humidity Sensor group 113 contains three group interfaces, and this three group interface is respectively temperature interface 201, humidity interface 202 and power interface 203; This three group interfaces unification surpasses five class netting twines with one and joins, and end is with crystal head 116;
In humiture collection module group 106 in each humiture collection module, every two collection ports are one group, be respectively temperature acquisition port 601-2 and humidity collection port 601-1, two gather that port and power interface 602 is unified to be surpassed five class netting twines with one and join, and end is with crystal head 116; Two crystal heads pack into respectively connector 117 realizations and are connected, and Temperature Humidity Sensor 113 and humiture collection module group 106 are coupled together and carry out data acquisition.In test process, use lighttight sunshading board to be fixed on the probe top of Temperature Humidity Sensor, thereby reduce the impact of solar radiation.Cooling tower air inlet/outlet humiture and ambient temperature and humidity temporal evolution are larger, and this installs every 2s and automatically gather humiture and the ambient temperature and humidity of the each measuring point of primary cooling tower air inlet/outlet.
Temperature Humidity Sensor group can adopt the output of three-wire system 4～20mA electric current, precision ± 1%, and range is 0～50 DEG C, 0～100%RH, probe band screen pack, by 24VDC Power supply.
Described harvester 105 includes air velocity transducer group 115; In air velocity transducer group 115, each air velocity transducer contains two group interfaces, and to be respectively that wind speed interface 301 and power interface 302, two group interfaces are unified surpass five class netting twines with one and join this two group interface, and end is with crystal head 116;
In wind speed acquisition module 108, one gathers that port 801-1 and power interface 802 is unified to be surpassed five class netting twines with one and join, end is with crystal head 116, two crystal heads pack into respectively connector realization and are connected, and air velocity transducer 115 and wind speed acquisition module 108 are coupled together and carry out data acquisition.Because cooling tower air inlet/outlet wind speed in a short period section changes not quite, in order to reduce cost and to ensure that data are effective, wind speed and the ambient wind velocity of the every 15 minutes each measuring points of test primary cooling tower air inlet/outlet.
Described harvester 105 also includes thermopair group 114; Thermopair group 114 is directly connected to the collection port 701 (carrying out temperature acquisition) of a thermocouple acquisition module in thermocouple acquisition module group 107.
Described air velocity transducer 115 is the output of two-wire system 4～20mA electric current, precision ± 1%, and range is 0～15m/s, probe band screen pack, by 24VDC Power supply.
Described thermocouple acquisition module group 107 can adopt T-shaped thermopair, precision ± 1%, and range is-200～350 DEG C, and positive pole is fine copper, and negative pole is cupronickel, by 24VDC Power supply.
The cabinet size of described acquisition module 104, can suitably adjust according to the number of acquisition module, and cabinet can adopt band eaves outdoor water-proof type electronic box.
Above Temperature Humidity Sensor group 113, air velocity transducer group 115 and the sensor of thermopair group 114 and the number of thermopair are determined according to cooling tower measuring point number, and the number of modules of humiture collection module group 106, thermocouple acquisition module group 107 is also to determine according to cooling tower measuring point number simultaneously.
This device can ensure data accurate and effective, can at utmost reduce again manpower and materials, can evaluate cooling tower performance in real time simultaneously comprehensively, and this is the target that cooling tower performance test is pursued.For the larger parameter of real-time change, for example, at the bottom of air inlet/outlet humiture, ambient temperature and humidity, turnover tower water temperature and tower water temperature, setting acquisition time by the test software platform of portable PC is 2s, realizes the collection of high density active data; For the less parameter of real-time change, for example air inlet/outlet wind speed, ambient wind velocity, can test once each measuring point for every 15 minutes; For the higher situation of air-out humidity, adopt Temperature Humidity Sensor and the air velocity transducer of probe with the resistance to high humidity of screen pack; In order to reduce the impact of solar radiation on sensor, use lighttight sunshading board to be fixed on the probe top of Temperature Humidity Sensor.
Application example summary:
In order to make this device be widely used in dissimilar cooling tower, according to national testing standard, measuring point numbers maximum air intake surface can be defined as to 16, the measuring point number that outlet air surface is maximum is defined as 8, and at the bottom of tower, maximum measuring point numbers is defined as 12.Can obtain thus, 12 measuring points of water temperature at the bottom of tower, turnover tower water temperature totally 2 measuring points, therefore need 12 thermopairs; 16 measuring points of air intake surface, 8 measuring points of outlet air surface, 1 measuring point of environment, therefore needs 25 Temperature Humidity Sensors; 3 of air velocity transducers, 2 for measuring air inlet/outlet wind speed, and 1 for measurement environment wind speed.
Humiture collection module adopts ADAM4117 firm analog input module, has 8 passages, 4～20mA input.According to Temperature Humidity Sensor number, humiture collection module group includes 4 ADAM4117 modules.Temperature Humidity Sensor adopts HF364 pipeline type Temperature Humidity Sensor
Wind speed acquisition module can adopt ADAM4117 firm analog input module, has 8 passages, 4～20mA input.According to air velocity transducer number, select 1 ADAM4117 module.Air velocity transducer adopts HF364 pipeline type Temperature Humidity Sensor
Thermocouple acquisition module group can adopt ADAM4118 firm thermopair load module, has 8 passages, 4～20mA input.According to thermopair number, thermocouple acquisition module group includes 2 humiture collection modules.Thermopair adopts TT-T-24-SLE type thermopair.
Air intake/outtake surface is pulled on the nylon rope of about spacing 18CM symmetrically, Temperature Humidity Sensor is fixed on rope with band.The distance of sensor and air intake surface is within 2m, and outlet air surface sensor is arranged symmetrically with.Lighttight mimeograph is fixed on the probe top of Temperature Humidity Sensor.
Thermopair is placed in water inlet pipe or cloth tank for measuring inflow temperature, thermopair is placed in rising pipe or backwater ditch for measuring coolant-temperature gage; Thermopair is evenly arranged in the tank below tower packing, for measuring water temperature at the bottom of tower.
Flowmeter probe contact tube wall is polished to processing, and flowmeter mounting distance is at the upstream of water inlet pipe diameter 10D, 5D place, downstream.
As mentioned above, just can realize preferably the present invention.
Embodiments of the present invention are not restricted to the described embodiments; other are any does not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitute, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (5)
1. a cooling tower performance tester for on-line analysis, is characterized in that: comprise PC (101), sound meter (102), ultrasonic flow meter (103), acquisition module cabinet (104) and harvester (105);
Wherein, harvester (105) is connected to acquisition module cabinet (104), and acquisition module cabinet (104) is connected to PC (101) by RS484 and carries out data transmission; Sound meter (102) and ultrasonic flow meter (103) are directly connected to PC (101) by RS232 communication and carry out data transmission.
2. the cooling tower performance tester of on-line analysis according to claim 1, is characterized in that: described acquisition module cabinet (104) inside comprises that AC220V turns DC24V transformer (109), leakage switch (110), humiture collection module group (106), thermocouple acquisition module group (107), wind speed acquisition module (108);
In described humiture collection module group (106), each humiture collection inside modules contains power interface (602), data-out port (603) and gathers port (601);
In described thermocouple acquisition module group (107), each humiture collection inside modules contains power interface (702), data-out port (703) and gathers port (701);
Described wind speed acquisition module (108) inside is contained power interface (802), data-out port (803) and is gathered port (801);
After the power interface of described thermocouple acquisition module (107), humiture collection module group (106) and wind speed acquisition module (108) is parallel with one another, be connected to AC220V and turn DC24V transformer (109), AC220V turns DC24V transformer (109) and is connected to leakage switch (110), and leakage switch (110) is connected to 220V outlet;
After the data-out port of described thermocouple acquisition module (107), humiture collection module group (106) and wind speed acquisition module (108) is parallel with one another, be connected to RS485 converter (111), then RS485 converter (111) is connected to portable PC (101) and carries out data transmission.
3. the cooling tower performance tester of on-line analysis according to claim 1, is characterized in that: described harvester (105) includes Temperature Humidity Sensor group (113); Each Temperature Humidity Sensor in Temperature Humidity Sensor group (113) contains three group interfaces, and this three group interface is respectively temperature interface (201), humidity interface (202) and power interface (203); This three group interfaces unification surpasses five class netting twines with one and joins, and end is with crystal head (116);
In humiture collection module group (106) in each humiture collection module, every two collection ports are one group, be respectively temperature acquisition port (601-2) and humidity collection port (601-1), two gather that port and power interface (602) are unified to be surpassed five class netting twines with one and join, and end is with crystal head (116); Two crystal heads pack into respectively connector (117) realization and are connected, and Temperature Humidity Sensor (113) and humiture collection module group (106) are coupled together and carry out data acquisition.
4. the cooling tower performance tester of on-line analysis according to claim 1, is characterized in that: described harvester (105) includes air velocity transducer group (115); In air velocity transducer group (115), each air velocity transducer contains two group interfaces, this two group interface is respectively wind speed interface (301) and power interface (302), two group interfaces unifications surpass five class netting twines with one and join, and end is with crystal head (116);
In wind speed acquisition module (108), one gathers port (801-1) and power interface (802) is unified to surpass five class netting twines with one and join, end is with crystal head (116), two crystal heads pack into respectively connector realization and are connected, and air velocity transducer (115) and wind speed acquisition module (108) are coupled together and carry out data acquisition.
5. the cooling tower performance tester of on-line analysis according to claim 1, is characterized in that: described harvester (105) also includes thermopair group (114); Thermopair group (114) is directly connected to the collection port (701) of a thermocouple acquisition module in thermocouple acquisition module group (107).
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| CN104535106A (en) * | 2014-12-18 | 2015-04-22 | 上海金日冷却设备有限公司 | Cross-flow filler testing platform used for cooling tower |
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| CN109884426A (en) * | 2019-02-01 | 2019-06-14 | 上海理工大学 | Environmental control system cooling tower efficiency is obtained with the method for operation time limit evolution properties |
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