This document summarizes Sighten’s efficiency modelling features to calculate energy efficiency modeling, which calculates the usage and cost savings impact of various types of energy efficiency retrofitsprojects.
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Overview
A homeowner’s typical usage is pulled based on the address. For every EE each energy efficiency product added to the project, a percent reduction is calculated based on the percent better than the standard. The percent reduction is pulled directly from EnergyStar data on a per appliance basis. The percent reduction is applied directly to the end use consumption for the usage category directly connected to the EE product. Applying the reduction gives the post installation usage, and impact is directly shown in the usage/production charts.
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You can find the full list of EnergyStar products here. Sighen also allows the creation of your own supports adding custom energy efficiency equipment. |
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Given a home with 20,000 kWh of annual usage, let’s say the with 20% of the usage comes from appliances and 5% of the appliance usage comes from the Refrigeratorrefrigerator. Upgrading the refrigerator to a 25% more efficient version:
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The post installation usage = 1950 kWh
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Usage
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Modeling
To calculate the usage impact of retrofits, we model hourly usage categorized into heating, cooling, lighting, water heater, appliance, EV, and pool usage. We model typical usage based on zipcode using baseline data. This can be edited based on monthly or annual inputs for usage or bills (or from a CSV of interval data). This usage can be altered with projected usage to model changes from current usage due to the addition of a pool, EV, etc, or other significant changes to usage (e.g. change in occupancy). Usage personas can also be applied to adjust the daily usage profile by hour using template personas (e.g. 9-5 workers, daytime user) or custom 24 hour inputs.
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We have a catalog of efficiency retrofits of many categories including furnaces, water pumps, boilers, air conditioning, fans, roofing, windows, insulation, thermostat, air sealing, duct sealing, light, water heating, solar thermal, washers, dryers, cooking, dishwashers, refrigerators, and smart home monitoring. Many of these upgrades have default reduction percentages based on the percent better than the standard according to Energy Star data. Sighten also allows the creation of your own energy efficiency equipment with custom default reduction percentages.
Reduction
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Modeling
The usage savings are modelled by applying the percentage reduction to the retrofit’s corresponding usage category(ies) hourly usage or to the total hourly usage depending on the user’s input. This calculation is applied before any solar or storage modelling because they will not influence the customers consumption.
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