HKDSE Physics Quick Summary: Energy Efficiency in Building Rate of Heat Conduction: Learn the Law of Heat Conduction and how heat transfers through walls based on thermal conductivity. Thermal Transmittance (U-value): Understand how U-values measure heat conduction rates, and why double walls have lower U-values than single walls. Overall Thermal Transfer Value (OTTV): Discover the factors affecting a building's OTTV, including conduction (U-values, orientation) and radiation (surface color, shading). Energy Efficient Windows: Compare double glazing windows with solar control windows, including the benefits of Low-e coatings versus reflective glass. Green Building Design: Explore energy-saving features used in places like the Hong Kong Science Park, including building orientation, vegetation cooling, and water-cooled air conditioning.