Page Comparison

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Get the typical hourly shape of usage by type (AC, Heating, Lighting, etc.) as a percentage of all usage

• TMY Typical

• Explore other datasets (PSM3/NSRB??)

• What are the exact equipment/usage categories we need?

  • This dataset might not have them

  • If they dont we need to find typical profiles somewhere else or generate them ourselves

• Store data in Solar DB for each station

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Get estimated % reduction in equipment type specific usage from upgrading to specific equipment (i.e. A typical older model uses 1250kWh/yr and with the LG 2018 29.7 Cu Ft fridge you would now use 500kWh/yr, so the reduction for that piece of equipment is 60%.

• Energy Star Data

• Example entries

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• Total Offset Usage = Usage + Consumption - Solar System Production - EE Product Reduction

  • Usage: Genability + Manual Inputs

  • Solar system product: Production calculator or PVWatts

  • EE Products: Typical Usage pulled by region from EIA.gov data source

    • HVAC

    • Lighting

    • Appliances

      • Washer

      • Dryer

      • Refrigerator

      • Dishwasher

    • Water Heaters

  • Other EE Products:

    • Roofing

    • Cooking/Stove

    • Windows

  • Not Implementing:

    • Misc - the usage of miscellaneous products explicitly: TVs, Microwaves, Cell Phones, etc will not be reduced by specific items.  It will be reduced by impacts to the overall usage curve, such as roofing and windows.

• Product Selection

  • Windows - Manual override for % or kWh reduction

  • Roofing - Manual override for % or kWh reduction

  • HVAC  - Manual override for % or kWh reduction

  • Lighting 

    • For upgrade to LEDs, 90% decrease in usage for indoor and outdoor lighting

    • For upgrade to CFLs, 70% decrease in usage for indoor and outdoor

  • Appliances - Manual override for % or kWh reduction

    • Selected appliances only reduce the average usage of that specific appliance type, within the full category/8760 of appliances

  • Water Heaters - Manual override for % or kWh reduction

• Calculate average typical usage of selected equipment from stored data to get 8760 profile for selected EE product, for each selected EE product

• Calculate reduction using 8760 profile of EE product

  • A specific model gives the ‘precise’ reduction

  • A manufacturer allows us to calculate based on the average of all EE products for that specific manufacturer of a specific product type

  • A manual override is factored in directly as input, given the persona

• Apply reduction based on % or kWh

• Calculate 8760 usage profile post installation

• Calculate daily, monthly, quarterly, and yearly usage profiles

• Calculate bill savings, usage savings, incentives, etc.

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Advanced Calculations - for future consideration

• Windows - default % reduction based on climate, window U-factor

  • Consider number of rooms, square footage, construction year

• Roofing - default % reduction based on climate, existing roof: solar absorption and emissivity

  • Consider number of rooms, square footage, construction year, to set defaults

• HVAC  - default % reduction based on climate, 

  • Requires primary energy consumption input: gas or electric

  • Consider number of rooms, square footage, construction year, heating source (furnace, boiler, heat pump), heating type (forced air, steam radiant, radiant heating, hot water base boards, electric baseboards), seasonality, heating / cooling source, persona

• Lighting 

  • Consider number of rooms, square footage, construction year, indoor vs outdoor, persona

• Appliances

  • Selected appliances only reduce the average usage of that specific appliance type, within the full category/8760 of appliances

  • Consider number of rooms, square footage, construction year, persona