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BMS_Cost. A BAS system will have a capital cost of USD 100 to
150 per
sensor or control point and usually contribute 15% to 20% of the
total HVAC cost.
The payback period is usually 2 to 4 years but it is recommended
to check the economics that is unique to each project.
The BAS does not guarantee saving its own. The mechanical and
electrical system need to be equipped with design features that
introduce overall efficiency and safety
The saving is largely depend on the operators skill, duty hours
and the energy cost.
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Operating cost
It is necessary to decrease energy cost without discomfort to
the user
Is it possible with a DDC?
Load shedding
Optimum start/stop
Reduction of speeds
Tight shut off of building(Lead to Sick building syndrome,
Looses productivity and human health)
Constructi
on, 11%Financing,
14%
Alterations, 25%
Operation, 50%
Building Cost over 40 Years
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Operating cost Case Study 1
Gross area 1.2million sqft(=111,483 sqm)
AC area 1.0million sqft(92,900 sqm)
Tenant area 0.7 million sqft(65 000 sqm)
House for 8000 people + 2000 Visitors
Electricity/month 40million (about 1.7m kwh, max demand 5.5MVA),
Installed capacity 11.2MVA
5.5MVA/111,483sqm(=49VA/m2)
Water /month 1.2million (About 500m3 per day)
For 10 years
Capex -20%
Opex -80%
AC, 37%
Tenant, 20%
Landloard, 18%
AHU, 15%
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Operating Cost Case study 2
24 Storey Office building for Bank and tenants
Approx Gross floor area 40000m2
Air-condition area 28500m2
Car parks 6000m2
Electricity/month max demand 1600kVA, 600,000kWh
1600kVA/40000m2 (=40VA/m2)
Installed capacity, Electrical 2500kVA x 2 Nos
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Energy share Case Study 2
SLEMA Annual Sessions - 2010
47%
2%
28%
16%
1%2%
4%
Air-Conditioning
Fire & WaterSupplyLighting & Power -NormalCentral
UPS
Lifts
Serv Bld - Ltg, Pow& Ventilation
46%
2%
27%
16%
1%2%
6%
Air-Conditioning
Fire & Water Supply
Lighting & Power -NormalCentral UPS
Lifts
Serv Bld - Ltg, Pow& Ventilation
46%
2%
28%
16%
1%2%
5%
Air-Conditioning
Fire & Water Supply
Lighting & Power - Normal
Central UPS
Lifts
Serv Bld - Ltg, Pow &Ventilation
Mar 2010 Apr 2010
May 2010
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Case Study 1
1,700,000 kWh per month
(1,700,000kWh/111,483m2)x12=182 kWh/m2 per year
Case study 2
600,000 kWh per month
(600000kWh/40000m2) x 12 = 180 kWh/m2 per year
Useful Data from BSRIA
BSRIA(Building Services Research and Information
Association)
