The Rate of Heat Transfer
- Created by: adelesimpson
- Created on: 25-04-16 16:23
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- The Rate of Heat Transfer
- Bigger the temperature difference between an object and its surroundings the faster the rate at which energy is transferred by heating
- What affects the rate of energy transfer
- Surface area and volume of the object
- The material from which the object is made
- What type of surface is in contact with the object
- A fridge has cooling fins to increase heat loss from pipes
- A vacuum flask is designed to reduce heat transfer to or from the liquid inside
- How humans and animals cope with cold temperatures
- In cold conditions blood is diverted away from vessels in the skin surface to reduce heat loss by radiation
- Hairs on skin surface stand up which trap a layer of air next to skin helping to insulate body
- Animals have thick fur and a thick layer of fat under skin for insulation
- A large rounded body gives small surface area compared to volume - reduces heat loss by radiation
- Small ears reduce heat loss
- How humans and animals cope with hot temperatures
- In hot conditions more blood flows through vessels in skin's surface to increase heat loss by radiation
- Sweat removes heat from skin by evaporation
- Large ears act as radiators to help lose heat
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