CN105973631B - All-in-one evaporative cooling handpiece Water Chilling Units property test platform - Google Patents
All-in-one evaporative cooling handpiece Water Chilling Units property test platform Download PDFInfo
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- CN105973631B CN105973631B CN201610554123.9A CN201610554123A CN105973631B CN 105973631 B CN105973631 B CN 105973631B CN 201610554123 A CN201610554123 A CN 201610554123A CN 105973631 B CN105973631 B CN 105973631B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
Abstract
The invention discloses a kind of all-in-one evaporative cooling handpiece Water Chilling Units property test platforms, it is tested for the property for the tested unit to all-in-one evaporative cooling cold water, the all-in-one evaporative cooling handpiece Water Chilling Units property test platform includes test room, connects the test wind transport system and combined air processing, the cold water transport system for connecting the tested unit of the test room, and the control system controlled testing wind transport system, combined air processing, cold water transport system.It is an advantage of the invention that：All-round property testing can be carried out to all-in-one evaporative cooling handpiece Water Chilling Units, and more energy saving.
Description
Technical field
The present invention relates to experimental rig technical fields, more particularly, to a kind of all-in-one evaporative cooling handpiece Water Chilling Units performance
It is test bed.
Background technology
It is higher always that air-conditioning system power consumption accounts for civil buildings power consumption ratio.So with the growing tension of Energy situation, gush
Show various energy-saving cold water and is tested unit.Wherein, all-in-one evaporative cooling handpiece Water Chilling Units are exactly to occur in recent years
A kind of energy-saving cold water be tested unit.
All-in-one evaporative cooling handpiece Water Chilling Units are to be integrated with traditional full-liquid type or the tested unit of falling film type cold water, cooling
Tower, chilled water pump, cooling water pump and a efficient cold water developed is tested unit.Because which reduce traditional condenser cooling water biographies
It hot link and reduces the internal circulating load of cooling water and its overall performance is made to be greatly improved.
It is tested unit and cooling tower function, traditional water cooling since all-in-one evaporative cooling handpiece Water Chilling Units are integrated with cold water
Cold water is tested unit performance testboard and can not test its performance, and traditional wind-cooled cold-water is tested unit performance testboard
The humiture of measurement condition is unable to control again.That is, there is no suitable testboard to all-in-one evaporative cooling cooling-water machine at present
The performance of group is accurately tested.
Invention content
The object of the present invention is to provide a kind of all-in-one evaporative cooling handpiece Water Chilling Units property test platforms, it has energy
It is enough that all-round property testing, and more energy saving feature are carried out to all-in-one evaporative cooling handpiece Water Chilling Units.
The technical solution adopted in the present invention is：All-in-one evaporative cooling handpiece Water Chilling Units property test platform, is used for
The tested unit of all-in-one evaporative cooling cold water is tested for the property, the all-in-one evaporative cooling handpiece Water Chilling Units performance
Test bed includes test room, the test wind transport system for connecting the test room and combined air processing, connection
The cold water transport system of the tested unit, and to test wind transport system, combined air processing, cold water transport system into
The control system of row control.
The test room is a room with heat insulation layer, and the tested unit is placed within, and the test room
It is interior to be equipped with second temperature sensor, the second humidity sensor and the second differential pressure pickup.
The length, width and height of the test room inner cavity are at least taller and bigger at least 2m than the length and width of tested unit shape.
The test wind transport system includes：The air guide connect cover being set at the top of the test room, is connected to this and leads
The wind-collecting cover on gas connect cover top, in the horizontal homogenating plate being set in the wind-collecting cover, one end be connected on the wind-collecting cover and
The other end is connected to the first differential pressure pickup of air, and import connects the backwind tube of the outlet of the wind-collecting cover, is set to the return air
The first temperature sensor in pipe and humidity sensor, meanwhile, the outlet of the backwind tube is connected to the combined air processing
The outlet of import, the combined air processing is connected with ajutage, and the side wall of the test room is equipped with supply grille, this send
The outlet of air hose is connected to supply grille, and, first differential pressure pickup, the first temperature sensor and humidity sensor are believed
Number it is connected to the control system.
The combined air processing includes：Import is connected to the return fan section of the outlet of the backwind tube, import connection
The nozzle segment of the outlet of the return fan section is set to the third differential pressure pickup of the nozzle disengaging both sides of the nozzle segment, import connection
To the exhaustion section of the outlet of the nozzle segment, it is set in the exhaustion section and the mixer selector valve controlled by an Electric Actuator and air draft
Valve, import are connected to the mixing section of the outlet of the mixer selector valve, the fresh air for being set on the mixing section and being controlled by an Electric Actuator
Valve, import are connected to the pressure fan of the outlet of mixing section, meanwhile, which is connected to the outlet of the pressure fan, the exhaust valve
Outlet be connected to air, and, it is second differential pressure pickup and the mixer selector valve, exhaust valve, electronic corresponding to new air-valve
Actuator is controlled by the control system.
The outlet of the mixed wind section is equipped with homogenizing plate.
The combined air processing further includes：Import is connected to the first surface cooler of the outlet of the mixed wind section, import
It is connected to the second surface cooler of first surface cooler outlet, import is connected to the heating surface cooler of the outlet of second surface cooler,
Import is connected to the seam humidifier of the outlet of the heating surface cooler, and import is connected to the water blocking of the outlet of the seam humidifier
Plate, meanwhile, the water pipe head of first surface cooler is connected with the outlet pipe of the tested unit and return pipe, which goes out
Water pipe and return pipe are equipped with the first electric three-way regulating valves, three outlets of first electric three-way regulating valves respectively with the quilt
It is connected to survey unit outlet pipe, the water inlet pipe of first surface cooler, the return pipe of first surface cooler, first electric three passes adjusting
It is equipped with flowmeter and second temperature sensor, first electric three-way regulating valves between valve and the water outlet of the tested unit and is somebody's turn to do
It is equipped with third temperature sensor, the flowmeter, third temperature sensor, the 4th temperature sensor between the water inlet of tested unit
Equal signal is connected to the control system, which controls first electric three-way regulating valves.
First surface cooler, the second surface cooler, heating surface cooler, seam humidifier and water fender share that there are one water receivings
The bottom of disk, the drip tray is connected with trap, and the other end of the trap is connected to the outside of the combined air processing.
The cold water transport system includes the air cooling module that evaporator water pipe is connected to the water pipe head of second surface cooler
Heat pump unit is equipped with cold water storage cistern, the first water pump and the second electric three passes on the outlet pipeline of the air-cooled modular heat pump unit successively
The recuperation of heat water pipe of regulating valve, the air-cooled modular heat pump unit is connected with the water pipe head of the heating surface cooler respectively, this is air-cooled
Boiler, the second water pump, third electric three-way regulating valves are equipped on the outlet pipeline of module heat pump unit successively, meanwhile, the control
System processed controls second electric three-way regulating valves, third electric three-way regulating valves.
The control system uses DDC or PLC.
The invention has the advantages that compared with the prior art,：All-in-one evaporative cooling handpiece Water Chilling Units can be carried out
All-round property testing, and it is more energy saving.The all-in-one evaporative cooling handpiece Water Chilling Units property test platform of the present invention can be sought
The required epidemic disaster environment of performance test of all-in-one evaporative cooling handpiece Water Chilling Units is made, and is utilized to greatest extent tested
Unit itself cold thus allows for integration test, and more energy saving.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples：
Fig. 1 is the front view of the component connection of the embodiment of the present invention；
Fig. 2 is the vertical view of the test room of the present invention.
In figure：
1, it is tested unit；
2, air guide connect cover；
3, homogenating plate；
4, the first temperature sensor；
5, humidity sensor；
6, wind-collecting cover；
7, backwind tube；
8, combined air processing；
9, return fan section；
10, homogenizing plate；
11, the first surface cooler；
12, the second surface cooler；
13, water fender；
14, surface cooler is heated；
15, nozzle segment；
16, pressure fan；
17, supply grille；
18, new air-valve；
19, mixer selector valve；
20, exhaust valve；
21, cold water storage cistern；
22, drip tray；
23, the second electric three-way regulating valves；
24, the first water pump；
25, air-cooled modular heat pump unit；
26, second temperature sensor；
27, the second humidity sensor；
28, the first differential pressure pickup；
29, the second differential pressure pickup；
30, test room；
31, the first electric three-way regulating valves；
32, flowmeter；
33, third temperature sensor；
34, the 4th temperature sensor；
35, humidifier；
36, third differential pressure pickup；
37, trap；
38, third electric three-way regulating valves；
39, the second water pump；
40, boiler；
41, ajutage.
Specific implementation mode
Embodiment is seen figure 1 and figure 2：All-in-one evaporative cooling handpiece Water Chilling Units property test platform, for one
The tested unit 1 of body evaporation cooling type cold water is tested for the property.
The all-in-one evaporative cooling handpiece Water Chilling Units property test platform includes test room 30, connects the test room
30 test wind transport system and combined air processing 8, the cold water transport system for connecting the tested unit 1, and to surveying
The control system that examination wind transport system, combined air processing 8, cold water transport system are controlled（It is not shown on figure）.That is,
The all-in-one evaporative cooling handpiece Water Chilling Units property test platform can utilize at test wind transport system and combination type air
Reason machine 8 is that temperature and humidity environment is built in the test room 30, which is that tested unit 1 builds working condition
And test cold water flow, and the control system can control the working condition of above-mentioned parts and be detected the calculating of result.Such as
This, can carry out integration test to the all-in-one evaporative cooling handpiece Water Chilling Units performance.
More specifically：
The test room 30 is a room with heat insulation layer, and the tested unit 1 is placed within.Certainly, the survey
The side for trying room 30 is equipped with the door with heat-insulation and heat-preservation ability, and remaining three side is all made of heat-insulating heat-preserving material preparation
Or there is heat insulation layer.Preferably, in order to ensure placement and the test space, the length, width and height of 30 inner cavity of test room at least compare
The big at least 2m of the length, width and height of 1 shape of tested unit.Second temperature sensor 26 is equipped in the test room 30, the second humidity passes
Sensor 27 and the second differential pressure pickup 29.That is, monitored by the second differential pressure pickup 29 with the pressure difference of outside atmosphere in the room,
Temperature and humidity in room is monitored by second temperature sensor 26 and the second humidity sensor 27.
The test wind transport system includes：It is set to the air guide connect cover 2 at 30 top of test room, passes through connection method
The components such as orchid are connected to the wind-collecting cover 6 on 2 top of air guide connect cover, in the horizontal homogenating plate 3 being set in the wind-collecting cover 6,
One end is connected on the wind-collecting cover 6 and the other end is connected to the first differential pressure pickup 28 of air, and import connects the wind-collecting cover 6
The backwind tube 7 of outlet, the first temperature sensor 4 and the humidity sensor 5 being set in the backwind tube 7.Meanwhile the backwind tube 7
Outlet be connected to 8 import of combined air processing, the outlet of the combined air processing 8 is connected with ajutage 41.
The test room 30 is equipped with supply grille 17 on the side wall other than installation door, and the outlet of the ajutage 41 is connected to air-supply
Grid 17.And first differential pressure pickup 28, the first temperature sensor 4 and 5 equal signal of humidity sensor are connected to the control
System.That is, the air flowed out out of this test room 30 has suitable temperature after the combined air processing 8 processing
With the air of humidity the test room 30 is back flowed back by the supply grille 17.
The combined air processing 8 includes：Import is connected to the return fan section 9 of the outlet of the backwind tube 7, import connection
The nozzle segment 15 of the outlet of the return fan section 9 is set to the third differential pressure pickup 36 of the nozzle disengaging both sides of the nozzle segment 15, into
Mouth is connected to the exhaustion section of the outlet of the nozzle segment 15, is set to the mixed wind controlled in the exhaustion section and by an Electric Actuator
Valve 19 and exhaust valve 20, import are connected to the mixing section of the outlet of the mixer selector valve 19, electronic are held on the mixing section and by one
The new air-valve 18 of row device control, import are connected to the pressure fan 16 of the outlet of mixing section.Meanwhile the ajutage 41 is connected to this and send
The outlet of the outlet of wind turbine 16, the exhaust valve 20 is connected to air.The third differential pressure pickup 36 and mixer selector valve 19, the air draft
Electric Actuator corresponding to valve 20, new air-valve 18 is controlled by the control system.Preferably, the outlet of the mixed wind section is set
There is homogenizing plate 10.
The combined air processing 8 further includes：Import is connected to the first surface cooler 11 of the outlet of the mixed wind section, import
It is connected to the second surface cooler 12 of first surface cooler 11 outlet, import is connected to the heating table of the outlet of second surface cooler 12
Cooler 14, import are connected to the seam humidifier 35 of the outlet of the heating surface cooler 14, and import is connected to the seam humidifier 35
Outlet water fender 13.Meanwhile the outlet pipe and return pipe phase of the water pipe head of first surface cooler 11 and the tested unit 1
Even, the outlet pipe of the tested unit 1 and return pipe are equipped with the first electric three-way regulating valves 31, first electric three-way regulating valves
31 three outlets are tested time of 1 outlet pipe of unit, the water inlet pipe of first surface cooler 11, first surface cooler 11 with this respectively
Water pipe is connected, and flowmeter 32 and third temperature are equipped between first electric three-way regulating valves 31 and the water outlet of the tested unit 1
It spends between sensor 33, first electric three-way regulating valves 31 and the water inlet of the tested unit 1 and is equipped with the 4th temperature sensor
34, the flowmeter 32, third temperature sensor 33,34 equal signal of the 4th temperature sensor are connected to the control system, the control
System controls first electric three-way regulating valves 31.Preferably, first surface cooler 11, the second surface cooler 12, heating surface cooler
14, seam humidifier 35 and water fender 13 share that there are one drip trays 22.The bottom of the drip tray 22 is connected with trap 37, should
The other end of trap 37 is connected to the outside of the combined air processing 8.
The sending of aforementioned combinatorial formula air processing machine, return fan is all made of frequency controlling fan, is respectively used to adjust in room
Air pressure in air pressure and air guide connect cover.Nozzle and differential pressure pickup of the setting for air measuring after air return section, are used for wind
The metering of amount.Exhaust valve and mixer selector valve is arranged in exhaustion section, for adjusting the air quantity being discharged in air and participating in the air quantity of cycle.?
Mixing section setting new air-valve reduces the load of surface cooler for supplementing outdoor fresh air.Enter test room to accurately control
Steam humidification section is arranged after bringing-up section, water fender is set after humidifier section for humidity, prevents air-supply band water.
The cold water transport system includes the air cooling module that evaporator water pipe is connected to the water pipe head of second surface cooler 12
Heat pump unit 25 is equipped with cold water storage cistern 21, the first water pump 24 and second on the outlet pipeline of the air-cooled modular heat pump unit 25 successively
Electric three-way regulating valves 23.Water pipe of the recuperation of heat water pipe of the air-cooled modular heat pump unit 25 respectively with the heating surface cooler 14 connects
Head is connected, and is equipped with boiler 40, the second water pump 39, third electronic three on the outlet pipeline of the air-cooled modular heat pump unit 25 successively
Logical regulating valve 38.Meanwhile the control system controls second electric three-way regulating valves 23, third electric three-way regulating valves 38.That is,
First surface cooler 11 makes full use of the cold that tested unit itself generates, and realizes that test is energy saving, the second surface cooler 12 is by the wind
Chill block heat pump unit provides low-temperature receiver, which is air-cooled recuperation of heat unit, and the heat of recycling is used for bringing-up section, realizes and survey
The energy of test system makes full use of.
DDC or PLC may be used in the control system.
The adjusting method of the present invention：
Air pressure in air guide connect cover 2 is balanced with atmospheric pressure.The control targe of first differential pressure pickup 28 is zero.Work as pressure
Difference is timing, and the frequency of return fan increases in return fan section 9；When pressure difference is negative, the frequency of return fan subtracts in return fan section 9
It is small.
Air pressure in test room 30 is balanced with atmospheric pressure.The control targe of second differential pressure pickup 29 is zero.Work as pressure
Difference is timing, and the frequency of pressure fan 16 increases；When pressure difference is negative, the frequency of pressure fan 16 reduces.
Second electric T-shaped valve regulating valve 23 of the second surface cooler 12 is controlled according to blasting humidity sensor 27.Work as humidity ratio
When desired value is big, the second electric three-way regulating valves 23 are opened greatly, and the cool water quantity into the second surface cooler 12 is increased；When humidity ratio target
It is worth hour, the second electric three-way regulating valves 23 turn down, and reduce the cool water quantity into the second surface cooler 12.
The third electric three-way regulating valves 38 for heating surface cooler 14 are adjusted according to wind pushing temperature sensor 26.When temperature compares mesh
When scale value is big, third electric three-way regulating valves 38 turn down, and reduce the hot water amount for entering heating surface cooler 14；When temperature compares desired value
Hour, third electric three-way regulating valves 38 are opened greatly, and the hot water amount for entering heating surface cooler 14 is increased.
New air-valve 18 links with mixer selector valve 19 and exhaust valve 20.When the humiture of outdoor air is suitable, introduce outdoor new
Wind is mixed with return air, reduces the moisture removal of the second surface cooler 12, energy-saving run may be implemented.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every utilization
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (7)
1. all-in-one evaporative cooling handpiece Water Chilling Units property test platform, for being tested to all-in-one evaporative cooling cold water
Unit（1）It is tested for the property, it is characterised in that：The all-in-one evaporative cooling handpiece Water Chilling Units property test platform includes
Test room（30）, connect the test room（30）Test wind transport system and combined air processing（8）, connect the quilt
Survey unit（1）Cold water transport system, and to test wind transport system, combined air processing（8）, cold water transport system
The control system controlled；
The test room（30）For a room with heat insulation layer, the tested unit（1）It is placed within, and the test
Room（30）It is interior to be equipped with second temperature sensor（26）, the second humidity sensor（27）And second differential pressure pickup（29）；
The test room（30）The length, width and height of inner cavity are at least than tested unit（1）The tall and big 2m of length and width of shape；
The test wind transport system includes：It is set to the test room（30）The air guide connect cover at top（2）, it is connected to this
Air guide connect cover（2）The wind-collecting cover on top（6）, the wind-collecting cover is set in horizontal（6）Interior homogenating plate（3）, one end connection
In the wind-collecting cover（6）The upper and other end is connected to the first differential pressure pickup of air（28）, import connects the wind-collecting cover（6）Go out
The backwind tube of mouth（7）, it is set to the backwind tube（7）The first interior temperature sensor（4）And humidity sensor（5）, meanwhile, this time
Air hose（7）Outlet be connected to the combined air processing（8）Import, the combined air processing（8）Outlet connection
There is ajutage（41）, the test room（30）Side wall be equipped with supply grille（17）, the ajutage（41）Outlet be connected to
Supply grille（17）, and, first differential pressure pickup（28）, the first temperature sensor（4）And humidity sensor（5）, second
Differential pressure pickup（29）, second temperature sensor（26）, the second humidity sensor（27）Equal signal is connected to the control system.
2. all-in-one evaporative cooling handpiece Water Chilling Units property test platform according to claim 1, it is characterised in that：Institute
State combined air processing（8）Including：Import is connected to the backwind tube（7）Outlet return fan section（9）, import connection should
Return fan section（9）Outlet nozzle segment（15）, it is set to the nozzle segment（15）Nozzle disengaging both sides third differential pressure pickup
（36）, import is connected to the nozzle segment（15）Outlet exhaustion section, be set in the exhaustion section and by an Electric Actuator
The mixer selector valve of control（19）And exhaust valve（20）, import is connected to the mixer selector valve（19）Outlet mixing section, be set to the mixing
The new air-valve controlled in section and by an Electric Actuator（18）, import is connected to the pressure fan of the outlet of mixing section（16）, meanwhile,
The ajutage（41）It is connected to the pressure fan（16）Outlet, the exhaust valve（20）Outlet be connected to air, and, the third
Differential pressure pickup（36）And the mixer selector valve（19）, exhaust valve（20）, new air-valve（18）Corresponding Electric Actuator is by this
Control system is controlled.
3. all-in-one evaporative cooling handpiece Water Chilling Units property test platform according to claim 2, it is characterised in that：Institute
The outlet for stating mixed wind section is equipped with homogenizing plate（10）.
4. all-in-one evaporative cooling handpiece Water Chilling Units property test platform according to claim 2, it is characterised in that：Institute
State combined air processing（8）Further include：Import is connected to the first surface cooler of the outlet of the mixed wind section（11）, import connection
To first surface cooler（11）Second surface cooler of outlet（12）, import is connected to second surface cooler（12）Outlet heating
Surface cooler（14）, import is connected to the heating surface cooler（14）Outlet seam humidifier（35）, import is connected to the steam
Humidifier（35）Outlet water fender（13）, meanwhile, first surface cooler（11）Water pipe head and the tested unit（1）'s
Outlet pipe is connected with return pipe, the tested unit（1）Outlet pipe and return pipe be equipped with the first electric three-way regulating valves（31）,
First electric three-way regulating valves（31）Three outlets be tested unit with this respectively（1）Outlet pipe, first surface cooler（11）
Water inlet pipe, first surface cooler（11）Return pipe be connected, first electric three-way regulating valves（31）It is tested unit with this（1）
Water outlet between be equipped with flowmeter（32）With third temperature sensor（33）, first electric three-way regulating valves（31）With the quilt
Survey unit（1）Water inlet between be equipped with the 4th temperature sensor（34）, the flowmeter（32）, third temperature sensor（33）,
4th temperature sensor（34）Equal signal is connected to the control system, which controls first electric three-way regulating valves
（31）.
5. all-in-one evaporative cooling handpiece Water Chilling Units property test platform according to claim 4, it is characterised in that：Institute
State the first surface cooler（11）, the second surface cooler（12）, heating surface cooler（14）, seam humidifier（35）And water fender（13）It shares
There are one drip trays（22）, the drip tray（22）Bottom be connected with trap（37）, the trap（37）The other end connection
To the combined air processing（8）Outside.
6. all-in-one evaporative cooling handpiece Water Chilling Units property test platform according to claim 4, it is characterised in that：Institute
It includes that evaporator water pipe is connected to second surface cooler to state cold water transport system（12）Water pipe head air-cooled modular heat pump machine
Group（25）, the air-cooled modular heat pump unit（25）Outlet pipeline on successively be equipped with cold water storage cistern（21）, the first water pump（24）With
Two electric three-way regulating valves（23）, the air-cooled modular heat pump unit（25）Recuperation of heat water pipe respectively with the heating surface cooler（14）
Water pipe head be connected, the air-cooled modular heat pump unit（25）Outlet pipeline on successively be equipped with boiler（40）, the second water pump
（39）, third electric three-way regulating valves（38）, meanwhile, which controls second electric three-way regulating valves（23）, third
Electric three-way regulating valves（38）.
7. all-in-one evaporative cooling handpiece Water Chilling Units property test platform according to claim 1, it is characterised in that：Institute
It states control system and uses DDC or PLC.
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| CN201610554123.9A CN105973631B (en) | 2016-07-14 | 2016-07-14 | All-in-one evaporative cooling handpiece Water Chilling Units property test platform |
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| CN108444743A (en) * | 2018-04-13 | 2018-08-24 | 南京工业大学 | It is a kind of based on the refrigeration air-conditioner comprehensive experimental system provided multiple forms of energy to complement each other and method |
| CN111595603B (en) * | 2018-09-27 | 2021-12-14 | 合肥通用机械研究院有限公司 | Improved testing device for testing water chilling unit with heat recovery function |
| CN109946098A (en) * | 2019-02-14 | 2019-06-28 | 江苏科技大学 | A kind of frozen condition lower surface cooler performance testing stand of enclosed band centre refrigerant |
| CN109827792A (en) * | 2019-02-14 | 2019-05-31 | 江苏科技大学 | The dry and wet refrigeration and heating condition lower surface cooler performance experimental rig of open type |
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| CN105158003A (en) * | 2015-09-17 | 2015-12-16 | 中国船舶重工集团公司第七〇三研究所无锡分部 | Energy-saving steam jet refrigeration unit test device |
| CN205898480U (en) * | 2016-07-14 | 2017-01-18 | 昆山台佳机电有限公司 | Integration evaporation cooling formula cold water unit performance test test bench |
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