The first alternative is to replace the centrifugal (chiller) of 50 tons, handlers and its system of insulation system. The initial costs are as follows:

Unit

Cost

Useful life

Centrifugal 50 tons

$30,000

12 years

Airside

$45,000

30 years

Materials

$2,000

n/a

Insulation system

$20,000

n/a

Concept of installation work *

$1,200

n/a

* Is reduced to 40% of the original cost in the event of replacing equipment. The maintenance of the centrifuge is in

Maintenance work

Staff requirements

Duration of work

Monthly salary

Cost

Cleaning every 6 months

1 technician

1 Assistant

1 day

$1,550

$1,515

Annual maintenance of water pump

1 technician

1 Assistant

1/2 day

$1,550

$1,515

Annual visit of the manufacturing

$1,000

Replacement fans every three years

1 technician

1 Assistant

1 hour

$1,550

$1,515

$150

Maintenance is performed by personnel from the workshop of cooling assigned to the Department of buildings and grounds of the land. Total hours working a regular employee in the enclosure is 1,950 hours per year, at a rate of 7.5 hours a day. (They must calculate the cost associated with maintenance of these teams in particular).

The additional costs associated with the operation of the centrifuge are as follows

Item cost

Frequency

Cost

Insulation of cold water pipe replacement

Every 5 years

$20,000

Acoustic cartons replacement *

Annual

$9,500

* Are incurred this cost because there is a maintenance program for the insulation system. Costs associated with electric centrifugal system consumption are as follows:

The cost of daily electricity consumption of a centrifuge of 50 tonnes is $123 per day.

The cost of power consumption of the Manager is $22 per day. Centrifugal system operates continuously. The second alternative involves the installation of a system of individual units which consists of four capacitors and 41 consoles.

The initial costs are as follows:

Item cost

Unit cost

Units

Total cost

Useful life

Condenser MDV 400

$8,450

2

6 years

Condenser MDV 450

$9,400

2

6 years

Consoles 12,000 BTU

$650

31

6 years

Consoles 19,000 BTU

$865

10

6 years

Materials *

$32,000

n/a

Concept of installation work *

$16,000

n/a

It includes materials for the insulation system. The replacement work is reduced to 80% of the original cost.

The maintenance of the system is in

Maintenance work

Staff requirements

Units

Duration of work

Monthly salary

Parts cost to replace

Console cleaning and replacing filters once a year

1 technician

1 Assistant

41

1.5 hours

$1,550

$1,515

$30/unit

Condenser cleaning once a year

1 technician

1 Assistant

4

1 hour

$1,550

$1,515

Replacement pump consoles, every 3 years

1 technician

1 Assistant

41

day

1 technician

1 Assistant

$50/unit

Maintenance is performed by personnel from the workshop of cooling assigned to the Department of buildings and grounds of the land. Total hours working a regular employee in the enclosure is 1,950 hours per year, at a rate of 7.5 hours a day. (They must calculate the cost associated with maintenance of these teams in particular).

The additional costs associated with the operation of the system of consoles are as follows

Item cost

Frequency

Cost

Replacement of refrigerant piping insulation

Every 12 years

$10,000

Acoustic cartons replacement *

Every 3 years

$9,500

This cost is incurred because there is a maintenance program for the insulation system. The costs associated with the electricity system consoles are as follows:

The full power of consoles system cost is $151.30 daily, at a rate of 12 hours a day. Assume that the system will operate for 260 working days annually.

1 do a present value analysis to select the best alternative

to consider that the replacements will be identical units

b. the residual value of the equipment corresponds to the cost of the unit arrangement

c. analyze a 30 year horizon

d. consider a rate of interest of 6%

The use of EXCEL is recommended to facilitate computations.