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### Homework2

Course: MAE 421, Spring 2008
School: N.C. State
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Word Count: 279

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421- MAE Spring 2009 Homework #2 1) You are considering placing a solar hot water system on a house in Wilmington, NC. Determine the total, beam, and diffuse radiation on the roof surface (South facing, tilt of 35 deg) for both March 15th and August 15th (can assume this is the average day of the month). (see section 2.6.3 in textbook) 2) Using the anistropic sky model and TMY2 data from online, determine the...

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421- MAE Spring 2009 Homework #2 1) You are considering placing a solar hot water system on a house in Wilmington, NC. Determine the total, beam, and diffuse radiation on the roof surface (South facing, tilt of 35 deg) for both March 15th and August 15th (can assume this is the average day of the month). (see section 2.6.3 in textbook) 2) Using the anistropic sky model and TMY2 data from online, determine the total, beam, and diffuse radiation on the roof surface from problem 1 for both March 15th and August 15th. (You will need to do this hourly so it is recommended that you use a software spreadsheet) (note: the day to day data in TMY2 data fluctuate representing typical weather patterns and may therefore not be very close to the average solar day that month) Read this article and answer the following questions: 1. http://www.energy.appstate.edu/docs/ZEH_report.pdf What is green building? 2. What is a utility bill guarantee program? 3. In the 1970s zero energy homes used batteries to store electricity, what has taken their place? 4. Renewable energy is only one aspect of zero energy homes, what is the other main aspect that allows them to feasibly achieve zero net utility energy? 5. How does the article define a tight home? 6. When a home is built tight what additional feature is required...

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