Advantages for Total Building Commissioning System

This system was applied to different administration buildings. Table (8.11) presents the cost for the commissioning a retrofit proj­ect. Table (8.12) shows the cost for applying building commission­ing to existing buildings. One can see that the cost payback varies from 0.3 to 1.6 years.

Although little research has been completed to document the link between comfort and productivity in the office environment, com­fortable employees are generally considered to be more productive than are uncomfortable employees.

Table 8.11 Costs for commissioning retrofit project

Scope

Cost Range

Total building commissioning

0.5-1.5% of total construction contract cost

HVAC and automated control system

1.5-4% of mechanical contract cost

Electrical system

1-1.5% of electrical contract cost

Table 8.12 Existing building system commissioning cost

Building Type

Commissioning Cost (USD in 1995)

Annual Savings (USD in 1995)

Payback Cost (Years)

Computer facilities/ office

24000

89758

0.3

High rise office

12745

8145

1.6

Medical institute

24768

65534

0.4

Retail

12800

8042

1.6

Table 8.13 Annual energy and cost savings from commissioning existing building systems projects

Building Type

Energy

Savings

Cost Savings (USD in 1995)

2043 m2 office

130800 KWh

7736

10200 m2 office

279000 KWh

12447

5574 m2 high-tech manufacturing facility

336000 KWh

12168

When occupants of an office building complain of discomfort, additional costs and lost productivity have been estimated to be significant.

One such estimate assumes that the typical building has one occupant per 200 square feet of space and an annual payroll cost of $34,680 per person (or $173 per square foot of office space).

If one out of every five employees spends 30 minutes a month complaining about the lighting, the temperature, or both, the employer loses $0.11 per square foot in annual productivity. In a 100,000-square-foot building, this loss amounts to $11,000 per year.

The comparison of cost savings in energy by applying the build­ing commissioning system for an existing building in 1995 is pre­sented in Table (8.13), noting that the cost saving is about $12,168 for 60,000ft2 manufacturing facilities.