Energy calculations

BUILDING ENERGY USE CALCULATIONS

IN-CLASS EXERCISE

The exercise calculating the building energy use was very helpful in guiding me to understand how to calculate the energy use in future building with no data yet to go off of as well as building that we do not have access to the data. The calculations are much more simple than I expected. Reducing the buildings energy by even 25% makes a significant difference. This is a simple way that we can help build more sustainable buildings and or renew older building to be more sustainable by using less energy.

In-Class Exercise #06: Calcuate Energy Use for a Building

Part I - Office Building Example

1. You design a 20,000 sf office building. How much energy does a baseline building of this type consume annually? Using your studio or past studio project -  nd the total SF of your building. How much energy does a baseline building of Source: Site: this type consume annually? Source: Site:

109.6-- 503,612 kbtu/ft^2 56.1-- 257,779.5 kbtu/ft^2

2. You complete an energy model and determine that by maximizing passive strategies for solar heat gain in the winter, shading in the summer, and natural ventilation for a significant part of the year, you can reduce the amount of energy your office building (from #1) consumes by 30%. How much energy is your building predicted to consume annually? Source: 151,083.6 kbtu/ft^2

Part II - Museum/Restaurant Example

3. You design a 20,000 sf building that contains a 15,000 sf museum and a 5,000 sf restaurant. How much energy does a baseline building of this type consume annually? Source: 112-- 1,680,000 kbtu/ft^2 573.7-- 2,868,50 kbtu/ft^2 =4,548,500 kbtu^2

4. In addition to applying passive strategies to this museum/restaurant building (from #3), you lower the lighting power density, you take advantage of daylighting and sensors to dim lights when there is enough sunlight to illuminate the space, and you employ heat recovery systems to capture and reuse waste heat. Via these strategies, your energy model predicts that you can reduce the amount of energy your building consumes by 70%. How much energy is your building predicted to consume annually? Source: 1,346,550 kbtu/ft^2 5. For your building in #4, you install a small PV array that can provide power for 25% of the demand on an annual basis. How many kBTUs of energy do you need from the grid (which will be powered by a mix of fossil fuels and renewable energy sources)? Assume this is an all-electric building.

341,137.5 kbtu/ft^2 is supplied by PV array 1,023,412.5 kbtu^2 is suppplied by the grid

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SUSTAINABLE SYSTEMS I TSM2001| Fall 2021