Darrel Long Ong Xin Jie Teo Zheng Jie Team G-Power Energy Efficiency (Ventilation) Lesson 1 Introductory Lecture
Lesson Objectives Lesson 1 Introductory Lecture
Thermal Energy Transfer Lesson 1 Introductory Lecture
Conduction <ul><li>Definition: </li></ul><ul><li>Transmission  of  molecular movement/thermal energy   through an object  ...
Convection <ul><li>Definition: </li></ul><ul><li>Heat transfer  from the  surface of a solid body  to a  fluid (gas or liq...
Radiation <ul><li>Definition: </li></ul><ul><li>Thermal energy that  can be transmitted through space  from one body to an...
Conduction, Convection and Radiation Lesson 1 Introductory Lecture CHALLENGE: Can you  identify  the processes of  conduct...
<ul><li>The  higher the temperature , the  more energy  these atoms and molecules have, and the  faster they move , hence ...
Hot Air and Cold Air <ul><li>APPLICATION </li></ul><ul><li>Where should ‘openings’ in a house be positioned? </li></ul><ul...
Cross-Ventilation <ul><li>Relies on  wind  to  force cool exterior air into the building  through an inlet (window, door, ...
Cross-Ventilation <ul><li>Benefits: </li></ul><ul><li>Passive cooling ; reduced reliance on air-conditioning </li></ul><ul...
The End <ul><li>Any questions? </li></ul>Lesson 1 Introductory Lecture
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Lesson 2 Introductory Lecture

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An Introduction to Energy Efficiency (Ventilation) by Team G-Power [4-086]. Copyright Team G-Power (Hwa Chong Institution, Singapore) 2011.

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Lesson 2 Introductory Lecture

  1. 1. Darrel Long Ong Xin Jie Teo Zheng Jie Team G-Power Energy Efficiency (Ventilation) Lesson 1 Introductory Lecture
  2. 2. Lesson Objectives Lesson 1 Introductory Lecture
  3. 3. Thermal Energy Transfer Lesson 1 Introductory Lecture
  4. 4. Conduction <ul><li>Definition: </li></ul><ul><li>Transmission of molecular movement/thermal energy through an object or between objects in direct contact </li></ul><ul><li>Magnitude of heat flow depends on </li></ul><ul><li>Area of section perpendicular to heat flow direction </li></ul><ul><li>Thickness of object(s) </li></ul><ul><li>Difference in temperature </li></ul><ul><li>Conductivity of material </li></ul>Lesson 1 Introductory Lecture
  5. 5. Convection <ul><li>Definition: </li></ul><ul><li>Heat transfer from the surface of a solid body to a fluid (gas or liquid) or the inverse through a cycle </li></ul><ul><li>Magnitude of heat flow depends on </li></ul><ul><li>Area of contact </li></ul><ul><li>Viscosity and velocity of the fluid </li></ul><ul><li>Difference in temperature between solid and fluid </li></ul><ul><li>Whether the fluid flow is laminar or turbulent </li></ul>Lesson 1 Introductory Lecture
  6. 6. Radiation <ul><li>Definition: </li></ul><ul><li>Thermal energy that can be transmitted through space from one body to another </li></ul><ul><li>Emission wavelength spectrum depends on: </li></ul><ul><li>Nature and on the temperature of the surface of the body </li></ul><ul><li>Amount of radiant heat flow depends on: </li></ul><ul><li>Temperatures of emitting and receiving surfaces </li></ul><ul><li>Emissivity and absorptivity of these surfaces </li></ul>Lesson 1 Introductory Lecture
  7. 7. Conduction, Convection and Radiation Lesson 1 Introductory Lecture CHALLENGE: Can you identify the processes of conduction , convection and radiation here?
  8. 8. <ul><li>The higher the temperature , the more energy these atoms and molecules have, and the faster they move , hence occupying more space </li></ul>Hot Air and Cold Air RECAP: Hot objects occupy more space than cold objects despite having the same weight As hot air takes up more space than cold air, hot air has a lower density  hot air will rise, cold air will sink Lesson 1 Introductory Lecture
  9. 9. Hot Air and Cold Air <ul><li>APPLICATION </li></ul><ul><li>Where should ‘openings’ in a house be positioned? </li></ul><ul><li>In the bottom and top of the house </li></ul><ul><ul><li>Bottom for cool air to flow in </li></ul></ul><ul><ul><li>Top for hot air to rise out of </li></ul></ul>Lesson 1 Introductory Lecture
  10. 10. Cross-Ventilation <ul><li>Relies on wind to force cool exterior air into the building through an inlet (window, door, etc.) and to force warm interior air out of the building through an outlet (window, door, etc.). </li></ul>Lesson 1 Introductory Lecture
  11. 11. Cross-Ventilation <ul><li>Benefits: </li></ul><ul><li>Passive cooling ; reduced reliance on air-conditioning </li></ul><ul><li>Allows for lighting of area </li></ul><ul><li>Case Study: </li></ul><ul><li>Edgedale Green in Punggol East </li></ul><ul><ul><li>Carpark block </li></ul></ul><ul><ul><li>Sides of lift lobby </li></ul></ul>Lesson 1 Introductory Lecture
  12. 12. The End <ul><li>Any questions? </li></ul>Lesson 1 Introductory Lecture

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