Question

why is it necessary to minimise the transfer of heat provide an example

Answer 1

Reducing heat transfer is one way of improving energy efficiency. Sometimes we want to keep things cool. In summer we use air conditioners to keep our homes and offices cool and comfortable. Electrical energy is saved if heat entering our rooms is minimized by good insulation. Similarly, energy is also saved when refrigerator walls are well-insulated. In winter, we wear thick clothes to keep ourselves warm. Heat loss from our body to the environment is reduced by our clothing. Vacuum flasks and thermal cookers also reduce heat loss to keep their contents hot.