1 / 19

Solar Water Heater

This presentation deals with solar water heaters. There are two categories (passive, active) There are two common types (conventional, vacuum tubes); uncommon - reflective Any of these may operate on one of two principles : direct or heat exchange. Solar Water Heater. objective. B. A. D.

mort
Download Presentation

Solar Water Heater

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. This presentation deals with solar water heaters. There are two categories (passive, active) There are two common types (conventional, vacuum tubes); uncommon - reflective Any of these may operate on one of two principles : direct or heat exchange. Solar Water Heater objective

  2. B A D C

  3. Objective 4.6 b : Students should be able to relate the principle of thermal energy transfer to the design of devices – solar water heater. Our Focus : Conventional passive direct. Pre-requisite : (a) Thermal transfer ( b) Absorption of radiation CXC CSEC Physics syllabusSection c : Thermal Physics and Kinetic Theory Radiation (vacuum) Conduction (solids) Convection (fluids) Flat black objects lesson

  4. Passive : active Passive : Outlet from collector is lower than inlet of hot water inlet to storage tank. No pump required. Active : Outlet from collector is higher than hot water inlet to storage tank. Pump required. More active More passive

  5. Examples of passive To active slide

  6. Examples of active

  7. Conventional : vacuum tube More vacuum tubes More conventional

  8. Conventional To vacuum tubes

  9. More Vacuum tube

  10. Reflective

  11. Direct : heat exchange

  12. Our focus : conventional passive direct

  13. Details of how it works A : How heat reaches Earth from Sun B : Why the glass? C : Copper tubes with heat sinks, painted flat black. D1 – D2 : Collector slanted with outlet at upper end and inlet at lower end. E : Insulated storage tank. F : Hot water outlet from tank to house at top of tank. critical thinking

  14. Critical thinking Please pause the video now, think about this for a few minutes, and then continue to find out how your answers compare with mine. State two correct features of the above diagramand one bad feature.

  15. Do you think this system will work? • Please pause the video now, think about this for a few minutes, and then continue to find out how your answers compare with mine. questions

  16. 1: By what method does heat from the sun reach Earth? Radiation 2. What effect does the glass of the collector produce? Greenhouse effect 3. Why is everything in the collector painted flat back? Flat black – best absorber of infrared radiation 4. What is the process by which heat is transferred through the walls of the copper tubing? Conduction Questions: More questions

  17. 5. In the passive system, by what process does the water flow through the tubes and into the storage tank? Convection 6. Why would 4 mm PVC (plastic) be a better material for the inside of the storage tank than 1 mm steel (assuming that both have the required strength)? 4 mm PVC is a better insulator. 7. Why is the hot water pipe to the home connected to the top of the storage tank? The hot water, being less dense, floats at the top. passive Questions resources

  18. http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=12850http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=12850 http://www.builditsolar.com/Projects/WaterHeating/water_heating.htm http://chinasolarwaterheater.blog.com/working-principle-of-solar-water-heater.html/ http://www.motherearthnews.com/Renewable-Energy/1979-09-01/A-Homemade-Solar-Water-Heater.aspx http://www.youtube.com/watch?v=oBpKPes3cEE passive Resources: Please visit http://csecphysics.weebly.com to view this presentation and to download a copy of the accompanying brochure or this PowerPoint presentation. To take the quiz, you will need an access code (available to my students). Conventional passive

  19. Examples of passive Reduce your carbon footprint Save on electricity bill To active slide

More Related