> The Chinese international high-tech achievement
trade fair (hereafter refers to as "Gao Jiaohui") is the national
science and technology department, the information industries
department, foreign economical Ministry of Trade and the Chinese
Academy of Science (namely "a three courtyard") for accelerates the
Chinese high-tech development, promotes the high-tech achievement
transaction but the trade fair which jointly sponsors in Shenzhen.
Gao Jiaohui the exhibition center is located in the Shenzhen
downtown area, floor space 28000m2, is a modernized large-scale
exhibition hall, also is the Shenzhen market condition to the 21st
century symbol constructions. This project deeply and highly
takes the all levels of leaders' powerful support, the Shenzhen
municipal government carries on for this face the international
tender. Building automation project prepares the person is
gazed, the international on several famous buildings automations
company participation competes the sign, finally, Shenzhen �Mr. the
industry develops the limited company to invite the Shanghai 希比
environment control limited company to take the technical support and
the equipment supply goods business, in competes in the sign to win.
In order to manifest high standard, multi-purpose, superior
quality, the low cost request, Gao Jiaohui the exhibition center
building automatic control system plan devotes to realizes in the
building various hardware system equipment management automation, the
intellectualization, the energy conservation, simultaneously provides
comfortably for the building user and the staff, is convenient, the
high efficiency environment.
1st, system choice
1. Traditional system limitation
Has been born the intellectualized building since the
world in, along with the people demand unceasing enhancement, the
building automatic control system has experienced the different
development phase.
At first, the people introduce the automatic control equipment
in the building the goal, lies in solves some concrete actual
problems, like the air conditioning temperature control, the building
energy management and so on, uses the equipment which some controls.
Along with building electromechanical device day by day rich,
uses the means which controls inevitably to create the control device
too numerously and disorderly, the control function is simple,
question and so on service maintenance trouble. Therefore, the
collection building automatic control system arises at the historic
moment, it also is the present tradition building automatic control
way. Realizes the programmable control through scene DDC,
greatly has enriched the control function, can satisfy user each kind
of special request. At the same time, it uses the computer
communication technology, becomes the DDC company the system
centralized management, enhanced the system reliability, reduced the
management work load, thus receives owner's universal welcome.
But, as a result of the demand unceasing rise, the traditional
building automatic control system limitation also gradually exposes,
induces, mainly has following several aspects:
First, the traditional building automatic control system
speaking of its essence, or a seal system. Displays in the
communication agreement, various factories do things their own way, is
mutually incompatible. However, said regarding a seal system
that, the realization integration meant massive software development
work, not only the cost is high, moreover natural energy balance.
Second, because the system is the seal, it from the design,
supplies goods, debugs the service, the maintenance, the promotion and
so on a series of work only can by this factory monopoly, the owner be
helpless, only can passively accept. So, the initial investment
cannot obtain the effective protection.
Third, when makes the world, the computer network technological
development changes with each new day, the product renews the cycle is
more and more short, the building automatic control new product also
will certainly to emerge one after another incessantly. As for
the loop system, the product renewal not only receives the factory
technological development the restriction, receives the factory
monopoly benefit the limit. In fact, must think the low cost the
track advanced technology development nearly is not impossible.
2. solutions - standard, opening communication agreement
The building automatic control system above difficulty
is the world. The various countries specialist later period
starts from the 80's to seek the solution. Today, the people
finally realized, only has draws up a standard completely public
communication agreement, supplies all factories to carry out together,
namely carries out the so-called open system, can completely change
the present situation, causes the building technology the development
to enter a brand-new stage.
Is not difficult to understand, if the different factory
"family's product carries out the identical communication agreement,
the weak electricity system integration, information sharing can
change easily; Similarly, after industry on designates an open
system, because carries out this servant all to put the agreement to
be different the control product which (produces all to be possible
compatibly to use, therefore, the user to the system each service, the
maintenance all may face the massive choices leeway, but receives some
factory again the monopoly limit; This time, in the market
appeared a better product, the owner still may the free selective
price realize the hardware promotion in the full comparison foundation
compared to the best product, thus achieved the track advanced
technological development the goal.
Thus it can be seen, in the true significance open system, must
also satisfy: Uses the standard the communication agreement;
This agreement must by various factories general acceptance,
become the mainstream. At present, in the building automatic
control domain, such standard agreement has two, is BACnet, uses in to
solve integration between the system; Another the LonWorks
technology which is American Echelon Corporation promotes, uses in
between the scene DDC mutually operation. Therefore, we thought
an ideal system should simultaneously hold on the above two standards.
In this, we pass through the prudent choice, decided uses the
American 希比 company I/A series intelligence building automatic
control system to realize Gao Jiaohui the exhibition center building
automatic control system.
3. opening I/A systems
I/A system is the American 希比 company newest
building intellectualization control system, this system has utilized
the current most advanced control network technology, its control bus
and the field bus used had the public standard the communication
agreement, caused the system completely to become a standard open
system, between each different system integration will change more
convenient and is feasible, has represented the building
intellectualization system next inevitable development tendency.
I/A system control bus has used the BACnet standard, its
communication speed may reach 10Mbps, passable PDS, also can through
the coaxial cable realization connection. BACnet is ASHRE (the
American heating, refrigeration and air conditioning engineer
association) 135-90 standard, and becomes the American country
standard as well as the European Economic Community standard draft.
The I/A system field bus uses the industry already the
communication efficiency highest LonWorks standard which recognizes,
with the twisted pair line connection, communication speed 78. 8Kbps,
the communication distance may reach 1200m. Its communication
agreement is the LonTalk agreement. LonTalk is the only
point-to-point communication standard, its use for completely realized
openness on field bus this level and operationally has mutually
provided the key to the situation, caused the entire building the
automatic control system more modernized, highly effective.
Because I/A system realizes two levels of main lines standards,
field bus all pitch points by the point-to-point way realization
communication, the communication answering time are smaller than for
0.5 second, enhances the system the reliability, its working
efficiency may completely satisfy the building control the real-time
request. The system capacity is big, the data channel multistage
redundancy, will provide the factory standard for the user next system
promotion the platform and the opening foundation, will guarantee the
user investment.
I/A system highly effective reliable network architecture,
opening nimble system constitution, advanced economical control
device, modular programming project software as well as friendly,
characteristic and so on succinct user contact surface, will cause
this systematic collection advanced, standard, reliable, the easy
maintenance is a body, the user does not need again to face the system
the expansion, the promotion, supplies goods the merchant to be
unitary and so on the question.
2nd, system function
We exhibition center each electromechanical device
including warmly pass the air-conditioning system to Gao Jiaohui in,
pass the exhaust system, the lighting system and so on the main
equipment use the computer central automation to monitor and to manage
the pattern. Achieved provides, the economical optimized control
reliably to each kind of unit. Below does the building character
automation control system plan design has the characteristic:
Has technical 先进�and the economical rationality, also can
satisfy the large-scale display also to be able to satisfy small
(partial) displays to the equipment grouping and the automatic control
as well as the energy conservation request. |
