CN208846609U - A kind of transmission and distribution network for large-scale centralized air-conditioning system - Google Patents
A kind of transmission and distribution network for large-scale centralized air-conditioning system Download PDFInfo
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- CN208846609U CN208846609U CN201821530797.6U CN201821530797U CN208846609U CN 208846609 U CN208846609 U CN 208846609U CN 201821530797 U CN201821530797 U CN 201821530797U CN 208846609 U CN208846609 U CN 208846609U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 47
- 238000004378 air conditioning Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 210
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 36
- 238000009825 accumulation Methods 0.000 description 12
- 230000003750 conditioning effect Effects 0.000 description 11
- 230000007704 transition Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 239000008400 supply water Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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Abstract
The utility model discloses a kind of transmission and distribution networks for large-scale centralized air-conditioning system, the transmission and distribution network is three control ring-type transmission and distribution networks, including it is parallel it is cricoid it is main for water conduit tube, cricoid main return water main pipe and cricoid second return water main pipe, large-scale energy source station is connected with main for water conduit tube for water end (W.E.), the backwater end of large-scale energy source station is connected with main return water main pipe, is connected between main return water main pipe and the second return water main pipe by the second bypass pipe；The utility model transmission and distribution network uses three control, make pipe network while meeting the dual requirements of transmission & distribution and energy supply, increase by the second return water main pipe, make to be used to cold-storage at night for return water main pipe, increase pipe network cold-storage ability, ground strong simultaneously solves the cold water that system return and return pipe are stored when letting cool and mixes the waste of energy consumption caused by water, and the abundance paddy electricity valence cheap using night reaches the double benefit of energy conservation with saving operating cost.
Description
Technical field
The utility model belongs to air conditioner refrigerating field, is related to large-scale centralized air-conditioning system, and in particular to one kind is for large size
The transmission and distribution network of central air-conditioning system.
Background technique
Field of air conditioning system form is mostly the small-sized air condition system of large-scale central air-conditioning system or dispersion, centralization at present
The disadvantages of large-scale energy source station has adjusting not flexible, and computer room space occupied is big, the small-sized air condition system of dispersion can only then utilize list
One energy carries out cold and heat supply, cannot achieve multi-energy complementation.Air-conditioning system is mostly 7 DEG C/12 DEG C for return water temperature summer, winter
Mostly 50 DEG C/40 DEG C, end is unable to satisfy using different grade heat sources and reaches energy saving purpose multi-level demand.Air-conditioning system it is defeated
Pipe network uses two pipes system or four-pipe system, usually only the two effects of fluid supply and energy transmission, the work without accumulation of energy
With, and not can be carried out the mutual energy between the small-sized air condition system dispersed and support.
Summary of the invention
For the deficiencies in the prior art, it is empty for large-scale centralized that the purpose of the utility model is to provide one kind
The transmission and distribution network of adjusting system solves the air conditioning terminal that meets that existing large-scale centralized air-conditioning system faces and utilizes different taste heat sources
Technical contradiction between demand and energy saving requirement.
In order to solve the above-mentioned technical problem, the application, which adopts the following technical scheme that, is achieved:
A kind of transmission and distribution network for large-scale centralized air-conditioning system, the transmission and distribution network are three control ring-type transmission & distribution pipes
Net, including it is parallel it is cricoid it is main for water conduit tube, cricoid main return water main pipe and cricoid second return water main pipe, large-scale energy source station
Be connected with main for water conduit tube for water end (W.E.), the backwater end of large-scale energy source station is connected with main return water main pipe, main return water main pipe and second
It is connected between return water main pipe by the second bypass pipe；It is main for being connected between water conduit tube and main return water main pipe by third bypass pipe
It is logical；
The large-scale energy source station for being equipped with water pump on water end (W.E.)；
The large-scale energy source station for being provided with valve between the water pump and large-scale energy source station on water end (W.E.)；
The large-scale energy source station for being provided with and communicated with the first bypass pipe between water end (W.E.) and backwater end；For the first of water end (W.E.)
Bypass pipe junction is located at between the water pump and valve on water end (W.E.)；
Valve and temperature sensor are provided on first bypass pipe；
Valve is provided in the backwater end of the large-scale energy source station；
Valve is provided on main return water main pipe between the backwater end and the second bypass pipe of the large-scale energy source station；
Valve is provided on second bypass pipe and third bypass pipe.
Compared with prior art, beneficial has the technical effect that the utility model
(I) the utility model transmission and distribution network uses three control, makes pipe network while meeting the dual requirements of transmission & distribution and energy supply, increases
Add the second return water main pipe, makes to be used to cold-storage at night for return water main pipe, increase pipe network cold-storage ability, while strong ground solution
The cold water that system return and return pipe are stored when letting cool of having determined mixes energy consumption caused by water and wastes, the abundance paddy electricity cheap using night
Valence reaches energy conservation and saves the double benefit of operating cost.Cyclic annular transmission and distribution network meets the energy phase of each energy Island simultaneously
It mutually supports, reduces energy waste problem when user's Smaller load.
(II) when the utility model transmission and distribution network is let cool after cold-storage, water flow can be dry in the second return water main pipe, main return water
It manages and main for one-way flow between water conduit tube, and temperature is detected by temperature sensor, be switched to conventional operating condition in time, it can be most
Cooling capacity of the savings in transmission & distribution official website is released to limits subscriber unit, improves energy-saving effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the transmission and distribution network of the utility model.
Fig. 2 is the structural schematic diagram of the air-conditioning system of utility model.
The meaning of each label in figure are as follows: 1- large size energy source station, 2- transmission and distribution network, 3- subscriber unit, 4- conventional end, 5-
Big temperature difference end, 6- secondary user unit, 7- energy Island, 8- dry coils, 9- dry type end, 10- water pump, 11- valve, 12-
Three-way valve, 13- temperature sensor；
101- is for water end (W.E.), 102- backwater end, the first bypass pipe of 103-；
201- is main for water conduit tube, the main return water main pipe of 202-, 203- the second return water main pipe, the second bypass pipe of 204-, 205-
Three bypass pipes；
301- level-one water segregator, 302- level-one water collector, 303- water supply branch pipe, the first return branch of 304-, 305- first
Accumulation of energy branch pipe, 306- the second accumulation of energy branch pipe, the second return branch of 307-, 308- first mix water pipe；
601- secondary water segregator, 602- second level water collector, 603- second level water supply branch pipe, 604- second level return branch, 605-
Second mixed water pipe.
Explanation is further explained in detail below in conjunction with particular content of the drawings and examples to the utility model.
Specific embodiment
It should be noted that large-scale energy source station in the utility model include various energy resources form cold and heat supply unit and
Ice Storage Tank.
It should be noted that the energy Island in the utility model is the air-conditioning system of small-sized dispersion, refer generally to air-source heat
Pump.
It should be noted that the summer of the utility model is to refer generally to annual May to October for cold season.
It should be noted that the winter of the utility model is heating season, refer generally to March of the annual November 15 to next year
15 days.
It should be noted that the conditioning in Transition Season of the utility model is non-heating for cold season.
It should be noted that the low-temperature cold water of the utility model is the cold water that supply water temperature is lower than 7 DEG C, refer generally to 2~3 DEG C
Cold water.
It should be noted that the high temperature cold water of the utility model is the cold water that supply water temperature is higher than 7 DEG C, refer generally to 14~16
DEG C cold water.
It should be noted that the high-temperature-hot-water of the utility model is the hot water that supply water temperature is higher than 50 DEG C, refer generally to 60 DEG C
Hot water.
It should be noted that the low-temperature water heating of the utility model is the hot water that supply water temperature is 50 DEG C.
It should be noted that conventional end refers to that summer supply and return water temperature is 7/12 DEG C of cooling supply end, winter is supplied back
The heating end that coolant-temperature gage is 50/45 DEG C.
It should be noted that big temperature difference end refers to that supply backwater temperature difference is greater than 5 DEG C of cold and heat supply end, refer generally to supply
The cold and heat supply end that backwater temperature difference is 10 DEG C or so.
It should be noted that dry type end refers to that summer supply and return water temperature is the cooling supply end of high temperature cold water.
Specific embodiment of the utility model is given below, it should be noted that the utility model is not limited to following tool
Body embodiment, all equivalent transformations made on the basis of the technical solutions of the present application each fall within the protection scope of the utility model.
Embodiment 1:
The present embodiment provides a kind of transmission and distribution network for large-scale centralized air-conditioning system, as described in Figure 1, the transmission & distribution pipe
Net 2 is three control ring-type transmission and distribution networks, including it is parallel it is cricoid it is main for water conduit tube 201, cricoid main return water main pipe 202 and ring
Second return water main pipe 203 of shape, large-scale energy source station 1 are connected with main for water conduit tube 201 for water end (W.E.) 101, and large-scale energy source station 1 returns
Water end (W.E.) 102 is connected with main return water main pipe 202, main for passing through third bypass pipe 205 between water conduit tube 201 and main return water main pipe 202
It is connected；
The large-scale energy source station 1 for being equipped with water pump 10 on water end (W.E.) 101；
The large-scale energy source station 1 for being provided with valve 11 between the water pump 10 and large-scale energy source station 1 on water end (W.E.) 101；
The large-scale energy source station 1 for being provided with and communicated with the first bypass pipe 103 between water end (W.E.) 101 and backwater end 102；For
103 junction of the first bypass pipe of water end (W.E.) 101 is located at between the water pump 10 on water end (W.E.) 101 and valve 11；
Valve 11 and temperature sensor 13 are provided on first bypass pipe 103；
Valve 11 is provided in the backwater end 102 of the large-scale energy source station 1；
It is arranged on main return water main pipe 202 between the backwater end 102 of the large-scale energy source station 1 and the second bypass pipe 204
There is valve 11；
Valve 11 is provided on second bypass pipe 204 and third bypass pipe 205.
Embodiment 2:
The present embodiment provides a kind of large-scale centralized air-conditioning system with distributed cold and heat source, as shown in Fig. 2, including large size
Energy source station 1, large-scale energy source station 1 are connected with subscriber unit 3 by transmission and distribution network 2, are dispersed on the transmission and distribution network 3 along journey more
A subscriber unit 3；
The transmission and distribution network 2 is using transmission and distribution network described in embodiment 1；
The subscriber unit 3 includes level-one water segregator 301 and level-one water collector 302, and level-one water segregator 301 passes through water supply
Branch pipe 303 is connected with the main of transmission and distribution network 2 for water conduit tube 201, and the level-one water collector 302 passes through the first return branch
304 are connected with the main return water main pipe 202 with transmission and distribution network 2；
The level-one water segregator 301 also passes through the main for 202 phase of water conduit tube of the first accumulation of energy branch pipe 305 and transmission and distribution network 2
Connection, the level-one water collector 302 are also connected by the second accumulation of energy branch pipe 306 with the main return water main pipe 202 with transmission and distribution network 2
It is logical；
The level-one water collector 302 also passes through the second return branch 307 and the second return water main pipe with transmission and distribution network 2
203 are connected；
Conventional end 4, big temperature difference end 5 have been installed in parallel between the level-one water segregator 301 and level-one water collector 302
With secondary user unit 6；
Secondary user's unit 6 includes secondary water segregator 601 and second level water collector 602, secondary water segregator 601 and one
Grade water segregator 301 is connected by second level water supply branch pipe 603, and second level water collector 602 and level-one water collector 302 pass through second level return water branch
Pipe 604 is connected, and energy Island 7, dry coils 8 and dry type end have been installed in parallel between secondary water segregator 601 and second level water collector 602
End 9.
As a kind of concrete scheme of the present embodiment, parallel communication is provided with the first mixed water pipe 308 on conventional end 4；Institute
Parallel communication is provided with the second mixed water pipe 605 on the dry coils 8 stated.
As a kind of concrete scheme of the present embodiment, water pump 10, the routine are mounted on the first accumulation of energy branch pipe 305
Water pump 10 is in series on end 4, big temperature difference end 5, energy Island 7, dry coils 8 and dry type end 9.
It is main for the close large-scale energy source station of water conduit tube 201 and main return water main pipe 102 as a kind of concrete scheme of the present embodiment
1 two sides are respectively arranged with valve 11；
The water supply branch pipe 303, the first return branch 304, the first accumulation of energy branch pipe 305, the second accumulation of energy branch pipe 306 and
Valve 11 is provided in two return branch 307；
Valve 11 is provided in the second level water supply branch pipe 603 and second level return branch 604；
Three-way valve 12 is provided on the mixed water pipe 308 of described first and the second mixed water pipe 605.
The utility model combines centralized large-size air conditioning system with distributing air-conditioning system, is able to achieve morning and evening or winter
Summer shifts to an earlier date or postpones cold and heat supply, makes the more flexible convenience of the runing adjustment of system.Centralized energy source station supplies low temperature to user
Cold water and/or high-temperature-hot-water, energy Island supply supplying high temperature cold water and/or high temperature cold water to user, meet air conditioning terminal benefit
Reach energy saving purpose multi-level demand with different taste heat sources.
The utility model is suitable for airport class and concentrates on one far from cities and towns, large space user and multiple modular small users
The occasion risen.
Embodiment 3:
The present embodiment provides a kind of control method of large-scale centralized air-conditioning system with distributed cold and heat source, and this method is adopted
With the large-scale centralized air-conditioning system with distributed cold and heat source as described in example 2 above.This method is according to locating for subscriber unit
Environment is summer, winter and conditioning in Transition Season, provides corresponding control method；
When the environment locating for the subscriber unit is summer, using summer control method；
When the environment locating for the subscriber unit is winter, using winter control method；
When the environment locating for the subscriber unit is conditioning in Transition Season, using conditioning in Transition Season control method；
In the summer control method, it can be stored first by the opposite transmission and distribution network of energy Island in multiple subscriber units
It is cold, then let cool by transmission and distribution network to multiple subscriber units.
Embodiment 4:
The present embodiment provides a kind of control method of large-scale centralized air-conditioning system with distributed cold and heat source, and this method is adopted
With the large-scale centralized air-conditioning system with distributed cold and heat source as described in example 2 above.This method is according to locating for subscriber unit
Environment is summer, winter and conditioning in Transition Season, provides corresponding control method；When the environment locating for the subscriber unit is summer, use
Summer control method, the summer control method are as follows:
Operating condition one, conventional operating condition:
The water pump for water end (W.E.) of large-scale energy source station starts, and concatenated water pump is opened on conventional end and big temperature difference end；
The valve for water end (W.E.) of large-scale energy source station is opened, and the valve of the backwater end of large-scale energy source station is opened, main return water main pipe
On valve open, the valve on water supply branch pipe, the first return branch is opened, and the three-way valve on the first mixed water pipe is according to conventional end
Supply and return water temperature required for holding proportionally is opened；
Conventional end and the operation of big temperature difference end, large-scale energy source station directly supplies low-temperature cold water to big temperature difference end, and leads to
It crosses after the mixed water of the first mixed water pipe and supplies room temperature cold water to conventional end；
Secondary user's unit and level-one water segregator and level-one water recovery apparatus disconnect simultaneously, energy Island, dry coils and dry type end
Water pump on end is opened, and secondary user's unit works independently；
Operating condition two, Smaller load operating condition:
Concatenated water pump is opened on conventional end, big temperature difference end, dry coils and dry type end and energy Island, other
Water pump is turned off；
Secondary user's unit is connected to level-one water segregator and level-one water recovery apparatus, and the three-way valve opening on the first mixed water pipe makes
The first mixed water pipe is obtained with conventional end disconnection and level-one water segregator is connected to conventional end, the three-way valve root on the second mixed water pipe
It is proportionally opened according to supply and return water temperature required for dry coils, other valves are turned off；
Large-scale energy source station stops supplying low-temperature cold water to subscriber unit, and energy Island is let cool, supply conventional end, big temperature difference end
End, dry coils and dry type end；
Operating condition three, to transmission and distribution network charging:
Water pump on first accumulation of energy branch pipe and energy Island is opened, and other water pumps are turned off；
Third bypass pipe, the first accumulation of energy branch pipe, the second accumulation of energy branch pipe, in second level water supply branch pipe and second level return branch
Valve is opened, and energy Island is connected to level-one water segregator and level-one water recovery apparatus, and other valves are closed；
Subscriber unit saves low-temperature cold water into transmission and distribution network under the drive of water pump；
Operating condition four: transmission and distribution network discharging:
Water pump on first accumulation of energy branch pipe is closed, and other water pumps are fully open；
Valve on first bypass pipe and the second bypass pipe is opened, and the valve on water supply branch pipe and the second return branch is beaten
It opens, the three-way valve on the first mixed water pipe and the second mixed water pipe is according to the supply and return water temperature demand tune of conventional end and dry coils
Whole aperture ratio, other valves are closed；
It is main to start to let cool for water conduit tube and main return water main pipe, supply conventional end and big temperature difference end, the second return water main pipe
Water is back to main return water main pipe by the second bypass pipe, the water one-way flow in main return water main pipe is simultaneously returned by the first bypass pipe
It flow to main for water conduit tube；
When the temperature of temperature sensor is greater than 8 DEG C, system is switched to conventional operating condition；
Secondary user's unit and level-one water segregator and level-one water recovery apparatus disconnect, and secondary user's unit works independently.
The process that secondary user's unit works independently are as follows: the water pump on energy Island, dry coils and dry type end is opened,
Triple valve supply and return water temperature according to needed for dry coils on second mixed water pipe is proportionally opened, energy Island, coil pipe and dry
The operation of formula end, energy Island is independently let cool to dry coils and dry type end or heat release.
When secondary user's unit works independently, independently let cool in summer control method, it is independent in control method in winter
Heat release.
There is provided high temperature cold water when energy Island is let cool, when energy Island heat release provides low-temperature water heating.
Embodiment 5:
The present embodiment provides a kind of control method of large-scale centralized air-conditioning system with distributed cold and heat source, and this method is adopted
With the large-scale centralized air-conditioning system with distributed cold and heat source as described in example 2 above.This method is according to locating for subscriber unit
Environment is summer, winter and conditioning in Transition Season, provides corresponding control method；When the environment locating for the subscriber unit is winter, use
Winter control method, the winter control method are as follows:
Operating condition one: conventional operating condition:
The open and close state of water pump and valve and the summer in the conventional operating condition of the winter control method
Water pump is identical with the open and close state of valve in the conventional operating condition of control method；
Large-scale energy source station is supplied to the direct supplying high temperature hot water in big temperature difference end, and by the first mixed water pipe to conventional end
It gives；
Secondary user's unit and level-one water segregator and level-one water recovery apparatus disconnect simultaneously, energy Island, dry coils and dry type end
Water pump on end is opened, and secondary user's unit works independently；
Operating condition two, Smaller load operating condition:
In the Smaller load operating condition of the winter control method open and close state of water pump and valve with it is described
Summer control method Smaller load operating condition in water pump it is identical with the open and close state of valve；
Large-scale energy source station stops supplying conventional end, big temperature difference end to subscriber unit supplying high temperature hot water, energy Island heat release
End, dry coils and dry type end.
Embodiment 6:
The present embodiment provides a kind of control method of large-scale centralized air-conditioning system with distributed cold and heat source, and this method is adopted
With the large-scale centralized air-conditioning system with distributed cold and heat source as described in example 2 above.This method is according to locating for subscriber unit
Environment is summer, winter and conditioning in Transition Season, provides corresponding control method；When the environment locating for the subscriber unit is conditioning in Transition Season, adopt
With conditioning in Transition Season control method, the conditioning in Transition Season control method are as follows:
The open and close state of water pump and valve and the summer control method in the conditioning in Transition Season control method
Smaller load operating condition in water pump it is identical with the open and close state of valve；
Large-scale energy source station stops supplying low-temperature cold water or high-temperature-hot-water to subscriber unit, and energy Island is let cool or heat release, supply
Conventional end, big temperature difference end, dry coils and dry type end.
Claims (8)
1. a kind of transmission and distribution network for large-scale centralized air-conditioning system, which is characterized in that the transmission and distribution network (2) is three control
Cyclic annular transmission and distribution network, including it is parallel it is cricoid it is main for water conduit tube (201), cricoid main return water main pipe (202) and cricoid
Two return water main pipes (203), large-scale energy source station (1) are connected with main for water conduit tube (201) for water end (W.E.) (101), large-scale energy source station (1)
Backwater end (102) be connected with main return water main pipe (202)；
It is connected between main return water main pipe (202) and the second return water main pipe (203) by the second bypass pipe (204)；
It is main to be connected for passing through third bypass pipe (205) between water conduit tube (201) and main return water main pipe (202).
2. being used for the transmission and distribution network of large-scale centralized air-conditioning system as described in claim 1, which is characterized in that the large-scale energy
Source station (1) for being equipped with water pump (10) on water end (W.E.) (101).
3. being used for the transmission and distribution network of large-scale centralized air-conditioning system as claimed in claim 2, which is characterized in that the large-scale energy
Source station (1) for being provided with valve (11) between the water pump (10) and large-scale energy source station (1) on water end (W.E.) (101).
4. being used for the transmission and distribution network of large-scale centralized air-conditioning system as claimed in claim 3, which is characterized in that the large-scale energy
Source station (1) for being provided with and communicated with the first bypass pipe (103) between water end (W.E.) (101) and backwater end (102)；For water end (W.E.) (101)
First bypass pipe (103) junction is located at between the water pump (10) on water end (W.E.) (101) and valve (11).
5. being used for the transmission and distribution network of large-scale centralized air-conditioning system as claimed in claim 4, which is characterized in that by described first
Valve (11) and temperature sensor (13) are provided on siphunculus (103).
6. being used for the transmission and distribution network of large-scale centralized air-conditioning system as described in claim 1, which is characterized in that the large-scale energy
Valve (11) are provided in the backwater end (102) of source station (1).
7. being used for the transmission and distribution network of large-scale centralized air-conditioning system as described in claim 1, which is characterized in that the large-scale energy
Valve (11) are provided on main return water main pipe (202) between the backwater end (102) and the second bypass pipe (204) of source station (1).
8. being used for the transmission and distribution network of large-scale centralized air-conditioning system as described in claim 1, which is characterized in that by described second
Valve (11) are provided on siphunculus (204) and third bypass pipe (205).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821530797.6U CN208846609U (en) | 2018-09-18 | 2018-09-18 | A kind of transmission and distribution network for large-scale centralized air-conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821530797.6U CN208846609U (en) | 2018-09-18 | 2018-09-18 | A kind of transmission and distribution network for large-scale centralized air-conditioning system |
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| CN208846609U true CN208846609U (en) | 2019-05-10 |
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ID=66372061
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064715A (en) * | 2020-09-08 | 2020-12-11 | 上海市政工程设计研究总院（集团）有限公司 | A municipal circulating water transmission and distribution pipe network system |
-
2018
- 2018-09-18 CN CN201821530797.6U patent/CN208846609U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064715A (en) * | 2020-09-08 | 2020-12-11 | 上海市政工程设计研究总院（集团）有限公司 | A municipal circulating water transmission and distribution pipe network system |
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