DC conceptual design

WCooliT offers a service of conceptual DC design. The basic result is:

Conceptual DC design includes:

  • calculation of DC power balance;
  • calculation of air flows and heat transfer in DC;
  • calculation of noise;
  • calculation of resulting energy efficiency of DC;
  • choice of best available technologies (cooling supply, energy distribution, backup and uninterrupted power supply, firefighting, dispatching control and monitoring) based on Customer’s demand;
  • layout architectural solutions;
  • layout technological solutions;
  • layout solutions for auxiliary rooms and rooms for accommodation of personnel;

As required and according to additional request WCooliT also offers:

Participation in defending Customer’s technological solutions, as well as assistance during a state expert review of a project.

Organizational planning includes:

  • calculation of labor costs for maintenance and operation of DC engineering systems;
  • development of payroll plan for maintenance team;
  • development of maintenance team position profiles;

Project administration at the stage of execution includes:

  • designer’s supervision;
  • consulting of prime contractor at the stage of project execution.
  • Administration of project sections (cooling supply, reserve and uninterruptable power supply, firefighting, dispatching control and monitoring);
  • Installation supervision of project sections (cooling supply, backup and uninterruptable power supply, firefighting, dispatching control and monitoring).

Why that is so important?

Data Center (DC) is a specially organized technological site for server and telecommunication equipment, connected to high speed Internet and equipped with means of physical and information protection, firefighting and climate control systems, uninterrupted and backup power supply, high-performance equipment and software.

Each DC must be initially designed for continuous operation.

Commonly DC is a protected premise equipped with the following systems:

  • main systems:
    • Uninterrupted power supply;
    • Backup power supply;
    • Ventilation and air conditioning;
    • SCS;
    • Network and computing infrastructure;
    • Data storage system;
  • supporting systems:
    • Monitor and access control;
    • Firefighting;
    • Fire and security alarm;
    • Monitoring, control and operation system;
    • Security system.

DC, as every industrial facility, is an expensive project in terms of initial investment and further facility operation. Thus while designing a DC it is important to give the highest priority to design quality and applied technological solutions. It is even more relevant currently, as the money value is very high and as a rule the market doesn’t give a second chance.

Example, how you can make investment efficient.

In the below mentioned Business Case one might see how two main principles – modularity in construction and development, and implementing of energy-efficient technologies – included on the stage of design allow to obtain an economic effect.

The following Business Case provides for the construction of DC with technology of two alternatives:

  1. Classic approach – DC is at once constructed to the full capacity. Technology adopts classic process solutions.
  2. Modular approach – DC is constructed by stages in terms of space and required equipment. Technology adopts modern energy-efficient equipment.

However external electric power for DCs is similar:

DC capacity limit, kW 1000
DC holding capacity, racks 300
Average capacity for one rack, kW 5
Discount factor, % 10
DC growing, Rack per year: 60 120 180 240 300
Traditional designed DC: 1st year 2nd year 3rd year 4th year 5th year
Investment per rack: $ 1,185.00
Total, DC investment: $ 355,500.00
Total, operational expenses:  $ 51,150  $ 63,936  $ 63,936  $ 63,936  $ 63,936
DC build stages:  $ 284.161  $ 71,040  –  –  –
Total, expenses:  $ 335,310  $ 134,976  $ 63,936  $ 63,936  $ 63,936
Accrual basis, total expenses:  $ 335,310  $ 470,287  $ 534,223  $ 598,160  $ 660,675
Accrual basis, total expenses considering cost of money:  $ 540,021  $ 197,619  $ 85,099  $ 77,362  $ 70,330
 $ 970,431
Energy efficient DC: 1st year 2nd year 3rd year 4th year 5th year
Investment per rack: $ 1,776.00
Total, DC investment: $ 532,800.00
Total, operational expenses:  $ 8,525.00  $ 17,049  $ 25,574  $ 34,099  $ 42,624
DC build stages:  $ 106,560  $ 106,560  $ 106,560  $ 106,560  $ 106,560
Total, expenses:  $ 115,085  $ 123,610  $ 132,135  $ 140,659  $ 149,184
Accrual basis, total expenses:  $ 115,085  $ 238,695  $ 370,830  $ 511,490  $ 660,675
Accrual basis, total expenses considering cost of money:  $ 185,346  $ 180,977  $ 175,871  $ 170,198  $ 164,103
 $ 876,495
Total savings on the project: $ 93,936.00

If to consider energy efficiency in another aspect, it is obvious that energy saving allows either to minimize the required capacity limit by reducing investment budget, or to use free capacity for additional racks.

The effect of using released capacity as a result of application of energy-effective technologies is shown below:

Traditional DC Energy Efficient DC
Power limit of DC:  1.000  KW  1.000  KW
Koeff. PUE:  1,5  1,2
IT-load:  666,7  KW  833,3  KW
Power for cooling and other energy expenses:  333,3  KW  166,7  KW
If we accept that:
Average of IT- load per rack:  5  KW  5  KW
Number of racks:  133  167
Average of price per 1 rack per month:  $ 45.00  $ 45.00
Price cost per 1 KWh:  $ 0,0042  $ 0,0042
Income DC per month:  $ 5,920.00  $ 7,400.00

Also when PUE reduced from 1,5 to 1,2 additionally arises:

The economic effect of reducing the cost of electricity (in case the number of racks are constantly) be: $ 497.00

Alternativelywe can estimate the the economic effect of converting the cost to income, namely:

As a result, we get a lower PUE release in the amount of of electrical power: 166,7 KW, which is equivalent to 33 racks with load 5 KW or additional $ 1465.00 income.

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