,MagnetizerIn this activity,Standard Fasteners, you will build your own solar cooker and test it under the sun to see how well it performs.Solar water heater uses radiation from the sun to heat up water. Solar water heater does not consume any fuel,Drive Shaft, so it is used in developing countries like in Africa where fuel is relatively expensive but sunlight is abundant.Procedure: A simple solar water heater can be constructed using everyday materials. Design of the solar water heater Apparatus: How to use a black surface to absorb more solar radiation? How to use shiny surfaces concentrate more solar radiation? How to use transparent surfaces to let in solar radiation,Hand Sprayer, and at the same use these surfaces to enclose the structure to reduce heat loss? How to reduce the energy loss by conduction and convection? ................ [top] Surface painted black is quite good in absorbing solar radiation. Appropriately curved shiny surface can reflect and focus solar radiation into the solar water heater. Glass is a good thermal insulator,Wireless Video Adapter, it can withstand high temperature,Wardrobe Door Manufacturer, let in solar radiation and may produce greenhouse effect inside the solar water heater. Make sure heat loss due to convection is reduced by covering all holes or openings. Easy access to the inside of the solar cooker for the placement of thermometer or temperature sensor. Set up your solar water heater under the sun. Place the thermometer or the temperature sensor in the water inside the solar water heater to measure its temperature. An efficient solar water heater should be able to make the temperature of water rise by a large amount within a short time. Reference information on the design and construction of the solar cooker can be found in books and the Internet etc. Keep the design simple and use everyday materials if possible.You have to consider the following in the design:Design... Notes to teachers: Remind students to ensure safety during the construction process. Take care when using tools and sharp instruments.How is your solar water heater compared with those of other groups in terms of efficiency? How can you be sure that this comparison is fair?[top] Material and tools decided by students.As you have to measure temperature inside the solar water heater,Segment LED Display, in your design you should be able to place the thermometer or temperature sensor inside the water heater without affecting its function. Students are divided into groups of 4-5 students each. Each group has to design and construct a solar cooker and measure the average temperature inside the cooker when it is set up under the sun.Introduction: Material and tools:Construction ideas...Measuring the temperature... Thermometer OR thermal couple and multimeter OR temperature sensor and datalogger.Comparison... Activity: Construction of a solar water heater [Printable view] Key Learning Points: 1. Measuring temperature 2. Heat transfer processes (conduction,Solar Water Heater, convection and radiation) 3. Factors affecting rate of heat transfer 4. Designing and constructing model 5. Self-learning The following construction ideas may be useful: