Solar Oven Design Challenge Follow Up Questions

Transcription

1 Name: Date: Period: Solar Oven Design Challenge Follow Up Questions Answer the following constructed response questions using complete sentences. Use appropriate science vocabulary throughout. Underline all vocabulary terms used in your answers. Energy Vocabulary Gravitational Energy Mechanical Energy Electrical Energy Thermal Energy Kinetic Energy Potential Energy Radiant Energy Chemical Energy Conduction Convection Radiation Insulator Conductor Temperature Absorb Reflect 1. After viewing the video clip of the parabolic building in London, use energy vocabulary to compare the functioning of a solar oven to the problem occurring in London. (Use the energy vocabulary.) 2. Energy use and lack of energy are hot topics around the world. Explain the global need for solar ovens. Describe why such technology is necessary for many cultures. Be as thorough as possible in your response. We have watched three videos and read the Solar Oven Society document on this topic. (Cite evidence from the provided text.)

2 3. Imagine cooking S mores in a solar oven (see picture below). Explain the process of thermal energy transfer (conduction, convection, and radiation) that allow the S mores to heat up in the solar oven. Be sure to indicate where and how these processes are taking place in the solar oven. (Use the energy vocabulary.) 4. Using the Ambient (Air) Temperature data and the Commercial Solar Oven Temperature graph on the following page, describe how the temperature of the air surrounding the solar oven (ambient temperature) impacted the performance of the commercial solar oven. (Cite evidence from the table.)

3 Use the following table and graph to answer question #4. Ambient (Air) Internal Temperature of Commercial Solar S Oven (ºC) Period Temperature (ºC) 0 min 5 min 10 min 15 min 20 min 25 min 30 min Commercial Solar Oven Temperatures by Class Temperature (ºC) Time (minutes)

4 The Global Need: Cooking Fuel is in Short Supply The United Nations' Food and Agriculture Organization estimates that more than 2.4 billion people lack adequate cooking fuels. (2.4 billion people is 2,400,000,000 people - nearly 8 times the population of the United States of America.) In developing countries, many people spend as much money on fuel to cook their food as they spend on buying food. Others spend over 40 hours a-week gathering scarce firewood. Total regions have been stripped of trees. Solar cooking has been researched and tested for the past twenty-five years. The SOS Sport is one of the best, low cost solar ovens to come out of this era of research and development. For developing nations that are sun rich and fuel poor, the Solar Oven Society (SOS) Sport Solar Oven can use free sunshine to cook meats, vegetables, breads and cakes and cut down on the need for cooking fires. Afghanistan Project In , 450 Sport solar ovens were distributed in Afghanistan as a test program to see how they worked for the Afghan people. To contribute to the next phase of the Afghanistan Project, go to the Donate page and write in Afghanistan Project on the printable form. Cooking fires contribute to deforestation and pollution Countries like Haiti and Nepal have less than 2% of their original forests remaining. Cooking fires pollute the atmosphere at significant levels that contribute to global warming and the greenhouse effect. There are serious health implications Cooking fires and smoke contribute to: o Lung disease o Eye disease o Burns In cooking huts - family members inhale smoke equivalent to 10 or more packs of cigarettes per day. Contaminated drinking water causes one billion children each year to suffer from diarrhea. Of those children, seven thousand die each day. Many people, primarily women and children, suffer eye and lung disease caused by smoke that is inhaled from cooking fires. This problem affects people everywhere Developing Countries - fuel poor but sun rich o Budgets are stretched - high percentages of family incomes go to fuel. o Limited access to credit. o People scavange for cooking fuel Developed Countries o Global warming o Less money from developing countries available to purchase goods Kitchens in Zambia are often smokefilled health hazards tothe women and children who use them. "I thank you for the oven I received and I already try it. It is wonderful. I cooked on it wheat and vegetable. The day after I cooked banane (green plaintain) and sweet potatoes. It was great. It took three hours for the wheat not much and five hours for banane and sweet potatoes. I will try again with others food. Thank you so much." Carmel in Haiti Searching for and gathering firewood takes up to 7 hours a day in some parts of the world. 9/30/2014 In Guatemala, a woman with her child cooks indoors over a smoky open fire.

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