P1: Basics Pt.2

P1: Basics Pt.2

1. Evaporation + Condensation

   • Water cycle

2. Evaporation + Condensation

   • Evaporation is quicker when:
     • Surface Area: More area to evaporate
       • Windy: Vapour above the liquid's surface does not become saturated
         • Warm: More energy to break bonds
   • Water Cycle

3. Energy transfer

   • Conduction
     • Hot objects cool = Energy transferred from the surface
   • Convection
     • Hot objects cool = Energy transferred to the surface
   • Surface Area > Volume = Faster energy transfer

4. Payback time

   • Payback time in years = Installation cost / Annual saving

5. Specific Heat Capacity

   • Energy To object: Object heats up Energy From object: Object cools down
   • Energy transferred (J) = Mass (Kg) x S.H.C. (J/KG °C) x Temperature change (°C)

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