Commercial Load Estimating
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Commercial Load Estimating. Richard Gaido, P.E. Types of Loads. Big Box Stores Grocery Stores Restaurants Schools Office Buildings Residential High Rises Hotels Data Centers Large Industrial Hospitals/Clinics Assisted Living/ Nursing Homes. Methodology of Diversification.

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Commercial Load Estimating

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Commercial Load Estimating

Richard Gaido, P.E.


Types of Loads

Big Box Stores

Grocery Stores

Restaurants

Schools

Office Buildings

Residential High Rises

Hotels

Data Centers

Large Industrial

Hospitals/Clinics

Assisted Living/ Nursing Homes


Methodology of Diversification

Historic Load

Square Footage

NEC Load Analysis


Historic Load

Know Your Customer

  • Check historical loads of similar projects.

  • Compare like for like projects.

  • Newer Wal-Marts/Targets, within the last 8-10 years, have a grocery component (refrigeration).

  • Verify if the footprint of the buildings are similar.

  • Inquire if there is something special about this project’s service that maybe different from a “normal” load usually seen.

    • Office Building - Data Center or Call Center proposed?

    • Grocery Store – Is there an increased amount of refrigeration planned?

    • Manufacturing – Is the process automated?


Historic Load

Know Your Customer continued

  • Ask the customer for an address for a similar service built and operational within the last 12-18 months to have a comparison.

  • Characteristics of loads to consider when sizing your services can be dependent on a couple of deciding factors for instance:

    • Schools- High demand for 8 hours out of the day then drop significantly, allowing the transformers time to cool.

    • Hospitals- Consistently high demand throughout the day, thus leaving little time for the transformers to cool.

    • Industrial – Are they running normal 8 hour days or 24/7?

    • Industrial Testing Facilities – What is the largest load that they will be testing? How long? How often?


Square Footage

  • Big Box Stores

    sample size of 103,000SF-133,000SF

  • Average SF: 115,758SF

  • Average kVA: 677kVA

  • Average VA/SF: 4.9 VA/SF

  • Hotels

    sample size of 13,00,000SF-46,000SF

  • Average SF: 26,469SF

  • Average kVA: 263kVA

  • Average VA/SF: 5.7 VA/SF

  • Schools

    sample size of 165,000SF-280,000SF

  • Average SF: 248,817SF

  • Average kVA: 2145kVA

  • Average VA/SF: 6.4 VA/SF

  • Data Centers

    sample size of 21,000SF-47,000SF

  • Average SF: 54,942SF

  • Average kVA: 1446kVA

  • Average VA/SF: 22.3 VA/SF


NEC Load Analysis

  • Grocery Stores

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Refrigeration 75%-80%

  • Lighting 45%-65%

  • Receptacles 40%-60%

  • Water Heaters 20%-40%

  • Hand Dryers 5%-10%

  • Miscellaneous Motors 10%-30%

  • Restaurants

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Refrigeration 40%-60%

  • Lighting 40%- 50%

  • Receptacles 20%-50%

  • Water Heaters 30%-50%

  • Hand Dryers 5%-10%

  • Residential/Office High Rises

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Lighting 40%-70%

  • Receptacles 30%-80%

  • Water Heaters 20%-35%

  • Elevators 5%-10%

  • Garage Lighting/Elevators 10%-30%

  • Assisted Living Facilities

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Lighting 30%-50%

  • Receptacles 20%-50%

  • Water Heaters 20%-30%

  • Elevators 5%-10%

  • Percentages used by line item on NEC Load Analysis provided by customer.


Q&A


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