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EFFECTING OF INVESMENT BMS SYSTEM
Function and mission of Building Management System
(BMS)
BMS system (Building Management System) has functions and missions:
- Control and monitoring Mechanical/Electrical systems in building to ensure optimal and effect operating these system.
- Co-ordinate operates all Mechanical and Electrical systems in Building for the best useful, security, safety and convenience for the people, these works in the building.
- It is interface tool for the people and mechanical for the worker can operate exactly, safety and effectively all the systems in the building.
- List of parameter: operating, status, technich all mechanical/electrical system in the building in data base to optimal operating.
- Automatic detecting the trouble and warning exactly and quickly to operating workers for they can repair to ensure safety.
- Making a convience, comfortable environment for all people, which work in the building and improve effective works.
I. GENERAL OF CONSUME POWER IN THE BUILDING
The using power of mechanical and electrical in the building folwing (List of ASHRAE association- Refrige, electric, mechanic America association) :
- Air conditioner system : 60% - 70 %
- Lighting system : 15% - 20%
- The others 10 -20%
And following this association, the using power supply for buildings is 20 – 50% in consume power of the country, so reducing consume power and protecting environment are urgent requesting with the mode buildings, now. To manage this problem, All the building system (Mechanical and electrical) is controled and combined with monitoring exactly.
Electrical parameters:
- Power factor cosφ = 0,8
- Using and time factor p = 0,8
Spending investment of BMS system:
- With BMS system is equiped all function then price cost about 5% in total the money spend at the project or about 38 USD/m2 using area.
- Calculating and estimating prise cost of BMS sytem follow quantity of DDC (Directly digital control) or I/O module and associate equipments of control system.
Ex: Follow concept design of system, the control poits of BMS system about 10.000 points. Price per unit about 112USD/point (This number follow our experience in design and contructing of many projects). So the investment money of BMS system is 112.000 USD or 18 billion VNđ.
II. FFECTIVE INVESMENT CALCULATING OF BMS SYSTEM IN TYPICAL BUILDING
1. Input parameters :
- The buiding is using the least 20 years.
- BMS system is expanded and connecting to another system within the future 20 years.
- Total of the using area >30,000m2
- Calculating power about 4800 Kw
- Spending money of BMS system about 5% the spending money total for project. The estimating money of project about 360 billion VNđ, so spending money of BMS system is 18 billion VNđ.
- Follow statistical list of association CABA (Continental Automated Buildings Asociation) and ASHRAE ( electric-refrige america association ) With studying many high rise buildings in the big countries on the wolrd for office, Air-conditioner often is centre or semi-centre ( Chillers, VRV, AHU, ...), when used BMS system and lighting control system EIB, then consume power of building decrease 15-20% because operating of all mechanical and electrical systems co-ordinates well each-others so it limit wasting power from the people, which are using power with waste habit.
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POWER SAVING
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No
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System
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Building without BMS
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Building with BMS |
Saving factor
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Remark
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1
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Ventilation, air-conditioner system, HVAC
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Operating independent and manual, no connect.
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All system connects each others and become one pefect system.
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10%
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-Wasting power from the people, which are using power with waste habit.
- Wasting power for they don’t co-ordinate in operating. - Wasting power from mechanical/electrical systems is operated are not correct, it isnot optimal because manual operating. - Wasting power from operating Mechanical/electrical systems with power supply bigger than necessary power.
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2
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Lighting system
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Without control
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Control in room and public area
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3%
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3
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The others system
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Without control and monitoring
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Control, connect, monitor and co-ordinate with mechanical and electrical systems.
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2%
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Total
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15%
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SAVING COST FROM REPAIR AND MAINTENANCE
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No
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System
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Building without BMS
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Building with BMS |
Saving factor
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Remark
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1
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Ventilation, air-conditioner system, HVAC
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Equipments always work in bad condition as over load long time, too below load, on/off many times…
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Equipments are co-ordinated and protected anti-shock, not overload. Operating with optimal power, when below power it discharges unnecessary loads.
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40%
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Saving cost for opating, repairing and maintenance
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2
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Lighting system
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Lightings always work with switch on/off many times so they have short life.
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Lightings are controlled by timer, dimmer automatic so they have long life.
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30%
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Saving cost for opating, repairing and maintenance
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3
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The others system
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All system operates independence, not co-ordinate so they make trouble each others.
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All system are one, peffect system
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20%
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Saving cost for opating, repairing and maintenance
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2. Calculating Effecting investment :
Power supply for building: P = 7.500x0,8x0,8 = 4.800kW
Consume power on day: Pn = Px8 = 38.400 kWh
Consume power on month: Pt = Pn x 30 = 1.152.000 kWh
With electric price cost on unit, now: 1,580VNĐ/1kWh
Electric money on month: S = Pt x1580 = 1,820,160,000 VNĐ
Building with BMS system, saving 15% power, so saving 15% electric money, the money will save per month:
Sđ = S x 0,15 = 273,024,000 VNĐ
Spending money for upgrade, maintenance for BMS system on month:
Sbd = 18,000,000,000 . 0,001 = 18,000,000 VNĐ
Saving money on month when the building has BMS system:
Skt = Sđ – Sbd = 255,024,000 VNĐ
Investment money for BMS system 18,000,000,000 VNĐ, amortization time of system:
Tkh = 18,000,000,000 /Skt = 70,54 (month) = 5,8 years
Conclusion:
So, investment money for BMS system about 5% investment money for total project, the owner will get back the money for BMS system after 5,8 years. The life of BMS system >20 năm, if it is maintenaced periodical time, profit of the owner after amortization time (Cal culating for 20 years):
S = 12x Skt . (20 – 5,8) = 43,456,089,000 VNĐ
3. Comparative graph:
a. Spending money for BMS with building
b. Saving power graph:
c. Coparative for electric money on month
Collective table:
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No
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Description
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Unit
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1
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Spending money for BMS system
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18,000,000,000.00
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VNĐ
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2
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Consume power of building
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4.800
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kW
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3
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Consume power on day
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38.400
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kWh
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4
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Consume power on month
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1.152.000
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kWh
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5
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Electric money on month with price/unit 1,580VNĐ/kWh
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1.820.160.000
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VNĐ
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6
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Saving money on month with BMS system
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273.024.000
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VNĐ
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7
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Spending money for upgrade, maintenance of BMS system (one month)
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18.000.000
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VNĐ
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8
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amortization time of BMS system(months)
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70.54
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Months
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9
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amortization time of BMS system(years)
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5.8
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Years
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10
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Saving money after amortization time ( calculating for 20 years)
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43.456.089.000
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VNĐ
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4. Conclusion:
After analysis and comparative have coclusion :
- Invesment money for BMS about 5% spending money for project (about 18 billion VNđ) this money will get back after 5,8 years.
- After amortization time, profit from BMS for calculating 20 years: 43.456.089.000 VNĐ
IV. THE OTHERS PROFIT FROM BMS SYSTEM
1. Reducing for operating.
2. Reducing spending money for maintenance and improve the life of equipment.
3. Safety, convenience for the people in the building
4. Friendly environment….
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