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An Arctic Solar Shelter An Arctic Solar Shelter Design Challenge Integrating the Engineering Design Process into a study of the Arctic Region STEM.

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Presentation on theme: "An Arctic Solar Shelter An Arctic Solar Shelter Design Challenge Integrating the Engineering Design Process into a study of the Arctic Region STEM."— Presentation transcript:

1 An Arctic Solar Shelter An Arctic Solar Shelter Design Challenge Integrating the Engineering Design Process into a study of the Arctic Region STEM

2 Kotzebue, Alaska is located 33 miles north of the Arctic Circle You can learn more about Kotzebue by visiting their web site You can learn more about Kotzebue by visiting their web site.

3 An Aerial View Of Kotzebue

4 Students in that community attend the Kotzebue Middle/High School Visit the schools web site at:

5 20 days of sunlight Because Kotzebue is just north of the Arctic Circle,here are 20 days each year when there are 24 hours of daylight. Because Kotzebue is just north of the Arctic Circle, there are 20 days each year when there are 24 hours of daylight. The summer solstice is in the middle of that 20 day period. The summer solstice is in the middle of that 20 day period. Would it be possible to take advantage of that 24 hours of sunlight to heat a shelter for Arctic researchers? Would it be possible to take advantage of that 24 hours of sunlight to heat a shelter for Arctic researchers?

6 The Arctic Solar Challenge Design, build, and evaluate the performance of a portable, temporary, passive solar structure that can be used as a shelter for researchers who will be in Kotzebue, Alaska around the time of a summer solstice..

7 In the Arctic Region, there is an interesting window of opportunity for a passive solar collector in terms the number of hours of daytime.

8 There is also a window of opportunity in terms of solar insolation. There is also a window of opportunity in terms of solar insolation.

9 Materials you can use to build a model of a solar shelter include: A photocopier paper boxA photocopier paper box Transparent window materialTransparent window material Reflective FoilReflective Foil Paper of different colorsPaper of different colors ScissorsScissors Insulating MaterialsInsulating Materials Other Easily Obtained MaterialsOther Easily Obtained Materials

10 The Engineering Design Cycle is one way to describe the process of designing, building, and evaluating the performance of a model of an Arctic solar shelter. Page 84 of the Massachusetts Science and Technology/Engineering Framework

11 Designing and building a passive solar shelter provides an opportunity to evaluate how energy is transmitted and transformed. Visible light and near infrared energy radiates from the sun and passes though windows of a passive solar collector and can be transformed into heat (thermal energy).Visible light and near infrared energy radiates from the sun and passes though windows of a passive solar collector and can be transformed into heat (thermal energy). Heat is conducted through the walls of a structure from a warmer environment to a colder environment.Heat is conducted through the walls of a structure from a warmer environment to a colder environment. Convection currents will form as air inside a building expands and rises as it is heated or compresses and sinks as it cools.Convection currents will form as air inside a building expands and rises as it is heated or compresses and sinks as it cools.

12 The angle of incidence of radiated sunlight entering a window changes as the seasons change and also depends on Latitude. The angle of incidence is also called the altitude of the sun.

13 You can design the location of windows so that the maximum amount of sunlight enters the structure and is converted into heat..

14 Insulating materials selected for your model of a shelter will reduce the loss of heat by conduction. The value of those materials depend on The thickness of the insulating material The type of insulating material Strategies used to insulate windows when there is little or no solar gain Insulating materials selected for your model of a shelter will reduce the loss of heat by conduction. The value of those materials depend on The thickness of the insulating material The type of insulating material Strategies used to insulate windows when there is little or no solar gain T2 T1

15 Even igloos have insulated walls. Air spaces in the blocks of snow reduce the reduce the rate at which energy is conducted though the walls. Even igloos have insulated walls. Air spaces in the blocks of snow reduce the reduce the rate at which energy is conducted though the walls.

16 You also need to manage the flow of air into and out of your model of a polar solar shelter. You also need to manage the flow of air into and out of your model of a polar solar shelter.

17 Some igloos are built to manage convection! Entryways of many igloos are designed to be lower that the elevated sleeping area. Some igloos are built to manage convection! Entryways of many igloos are designed to be lower that the elevated sleeping area.

18 Design a Valid Test. You need to simulate the conditions that polar researchers experience in Kotzebue, Alaska when you collect data with your model of a Arctic solar collector You need to simulate the conditions that polar researchers experience in Kotzebue, Alaska when you collect data with your model of a Arctic solar collector. For todays weather in Kotzebue visit:

19 The angle of incidence of sunlight is one factor to consider when designing a fair test of your Arctic solar collector. The angle of incidence of sunlight is one factor to consider when designing a fair test of your Arctic solar collector. The maximum angle of incidence of sunlight entering your passive solar collector needs to be similar to the maximum angle of incidence of sunlight in Kotzebue.

20 The midday sun in Kotzebue The highest altitude of the sun in Kotzebue on the first day of summer is 46.5º. The U.S. Naval Observatory web site provides the suns altitude data for any location..

21 The midday altitude of the sun is also approximately 46º F on the following dates at the following locations. The midday altitude of the sun is also approximately 46º F on the following dates at the following locations. In Corpus Christie, TX on February 5thIn Corpus Christie, TX on February 5th In Charlotte, NC and Flagstaff, AZ on February 27thIn Charlotte, NC and Flagstaff, AZ on February 27th In Columbia, MO on March 7thIn Columbia, MO on March 7th In New York City and Redding, CA on March 12thIn New York City and Redding, CA on March 12th In Detroit, MI and Boston, MA on March 17 thIn Detroit, MI and Boston, MA on March 17 th These dates would occur during a time periods when a test of a design of a polar solar shelter could be conducted. These dates would occur during a time periods when a test of a design of a polar solar shelter could be conducted..

22 Average daily temperatures are also an important factor when evaluating the performance of a model Arctic solar shelter. Average daily temperatures are also an important factor when evaluating the performance of a model Arctic solar shelter. Between the summer solstice and the middle of August, average high temperatures in Kotzebue range from 50º F to 60º F. The daily low temperatures range from 30º F to 50º F.

23 A NOAA web site can be used to compare early summer temperatures in Kotzebue with other locations at other times of the year. A NOAA web site can be used to compare early summer temperatures in Kotzebue with other locations at other times of the year.

24 This web site provides an animation that can be used to evaluate how the sunshine factor affects the window of opportunity for using a passive solar collector in the Arctic Region.

25 Other factors to consider when determining the fairness of the test of the performance of a model of an Arctic solar shelter include: TopographyTopography Wind direction and speedWind direction and speed Ground temperatureGround temperature Any other factors?Any other factors?

26 A series of tests of the performance of a model of an Arctic solar shelter also provides an opportunity to evaluate relationships among scientific variables. Controlled variables remain constant from one trial to the next. Examples include the angle of incidence of sunlight and outside temperatures.Controlled variables remain constant from one trial to the next. Examples include the angle of incidence of sunlight and outside temperatures. An independent variable changes from one trial to the next. An example would be the thickness of insulation in the floor, walls, and roof.An independent variable changes from one trial to the next. An example would be the thickness of insulation in the floor, walls, and roof. A dependent variable is one that depends on a value of an independent variable. An example would be changes in the shelters temperature that results from a change in the thickness of insulationA dependent variable is one that depends on a value of an independent variable. An example would be changes in the shelters temperature that results from a change in the thickness of insulation.

27 Lower Latitude applications of designing a passive solar Arctic shelter include: Describing how your design can be adapted for use in your region in either cooling or heating seasons.Describing how your design can be adapted for use in your region in either cooling or heating seasons. Determining the passive solar potential of your school building.Determining the passive solar potential of your school building. Evaluating the ecological advantages of passive solar structures.Evaluating the ecological advantages of passive solar structures.


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