1. Lauren Stencel Chapter 16
A Race for the Sun

2. Key words Passive solar heating system Active solar heating system
British Thermal Unit (BTU) Joule
Energy Efficiency

3. A Passive Solar Heating System
A house in the Northern hemisphere with this system have large south-facing windows.
Sunlight will shine onto a thermal mass through the windows.
The thermal mass will release stored energy during the night

4. An Active Solar Heating System
Uses pumps to move a working fluid from a solar collector to the interior of the structure

5. Energy Cannot be destroyed But can be stored or transferred
And measured in a system

6. A British Thermal Unit (BTU)
Is the amount of energy it takes to raise the temperature of one pound of water by on degree Fahrenheit.
How many BTU does this room need to heat?

7. A Joule
Is the metric unit for energy. It takes about Joules (or 1 calorie) to raise the temperature of one gram of water by one degree Celsius.

8. Energy efficiency
Is a ratio of the useful energy outputs to the energy inputs of a system.
If all of the inputs of a heating system were used to heat the house, then this ratio would be 1, or 100%.

9. Who is Lauren Stencel? Environmentalist Solar decathlete Architect
Environmental engineer

10. Building codes and Building zones Economical and political problems
What are the two different sets of constraints that Lauren’s team must consider when designing the house?
Money and Time
Building codes and Building zones
Economical and political problems
The house must function independently in its permanent location

11. Where should a thermal mass of a structure be located in order for passive solar heating to work well?
Inside the house
Basement
On the roof
Outside the house

12. What’s a passive solar heating system? Why is it called “passive”?
A passive solar heating system uses the energy of sunlight to warm a home.
Passive solar heating system involve large –south-facing windows so that the sun can shine onto a thermal mass to warm up the house.

13. The building should be sited so that one wall faces south to be energy-efficient. Why?
The attribute will allow for passive solar heating, solar day lighting, and will provide good surfaces for attaching solar panels.

14. What else can you do to make your building more energy-efficient?
The building should be designed with large, south-facing windows and a thermal mass on the interior of the building. (Why?)
Windows and doors should be designed to leak as little thermal energy to the environment as possible. (Why?)
Window coverings should be designed so that sunlight coming into the building can be reduced in summer months. (Why?)

15. What else?
A good insulator should be chosen for walls and roof. (Why?)
The heating system should include a thermostat in every room. (Why?)
Pipes in the heating system should be insulated as well. (Why?)

16. Which is a better insulator, wood or cellulose insulation
Which is a better insulator, wood or cellulose insulation? How do you know?
Cellulose insulation is a better insulator because R-value is higher.