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Engineering for Architectural Projects
Homework Number 1
This homework may be done in teams of two. Approximate equations for radiative, conductive and infiltration building envelope heat loss are given in the Farnsworth Web pages, along with various other pertinent data. Building geometry and materials are also given in the Web pages. Conductive and approximate radiative properties of building components are attached to this homework.
1. Make a spreadsheet that calculates the radiative, conductive, and convective heat losses through the envelope of the Farnsworth house during a night with mild winds and outside temperature is 6 oF. Use the skeleton spreadsheet in the Web pages as a basis for organizing your calculations. This is a big job.
2. Compare the total heat loss to that of a one story building of similar square footage constructed of wood platform frame construction. Refer to Building Control Systems, Bradshaw, pp92-100, which is also up in the Web pages.
3. Suggest an improved type of glazing for the building, and a new connection system between columns and glazing that will improve the thermal performance of the facade. Be sure that your proposal is sympathetic with the architect's aesthetic intent (read some of the critical essays on the building in the Web pages). Make a drawing similar to the one shown below that clearly illustrates the constructive detail of your modified facade.
4. What is the heat loss of the building with your modifications?
5. If there are expected to be 8,000 degree days at the Farnsworth house this winter, electricity will cost .10 per kilowatt and the radiative heating system produces 1 BTU per kilowatt of electricity, how much money would be saved if your modifications were installed?