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Back of the Envelope Calculator
By Shraddha Marathe posted on Thu, 2010-01-28 15:52 , 1291 reads, 2 commentsCreated by Energy Center of Wisconsin
You might be pondering these questions:
- What happens to cooling costs if I double my roof insulation?
- Does lighting efficiency also affect heating energy?
- Does it cost a lot to keep my building open longer?
- What if my building was made of glass?
- How much CO2 will this building produce annually?
Back-of-the-Envelope calculator is a learning tool that allows anyone to interact with a building as an energy system. You can see real-time energy connections between building components, isolate the effects of changing a single energy parameter, or produce concept-level energy and CO2 emissions estimates (rough estimates).
Check further limitations on the website.
Contact:
Scott Schuetter, Project Manager
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Sasaki Associates is an interdisciplinary firm of 300 professionals. Our founder, Hideo Sasaki, instilled the firm with a passion for critical thinking and open inquiry. In this spirit we created ideas.sasaki.com, to share our ideas and process with our colleagues, clients, and anyone else interested in our work. We hope you are inspired to engage us in further conversations about the topics you see here. Email us at ideas @ sasaki.com for more info
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Can anyone think why increasing "Weekly hours of occupancy" would reduce heating costs? Or is that an error in the model?
I agree at first it looks unlikely , although the total energy consumption does increase with increase in the occupancy hours. The interesting thing to notice is that although heating loads decrease, we can see an increase in the lighting, cooling, plugs and fan component consumption increases with increase in occupancy demand. The calculator may therefore be considering internal heat gains through appliances and occupants and therefore might be reducing the heating energy demand. Does this sound logical?
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