Unit 4 Science and Materials

Unit 4
Task 1
Comfort factors
Air Temperature and Radiant Temperature
Air Temperature is the temperature of the air that surrounds the body and is usually given in degrees Celsius (°C). Radiant Temperature is the heat that radiates from a warm object and may be present if there are heat sources in an environment. Radiant temperature has a greater influence than air temperature on how we lose or gain heat to the environment. The main example of a radiant heat source is: the Sun. The main scientific principle of temperature in a classroom is the flow of energy in and out and the resistance to the heat. For example, in the winter when it’s 0 degrees outside, to keep the classroom warm more energy will need to be put in to maintain a warm temperature. The resistance is the walls and other things separating the inside from the outside. If the walls are made of paper, the heat will escape quicker, when if it’s a cavity wall and has a brick inner layer, a concrete outer layer and insulation, the heat won’t escape as quick. Thermal comfort is the concept involving the broad satisfaction with the thermal environment. Basically it’s an environment in which people are neither overly warm nor overly cold, just at an average, comfortable temperature. Thermal Discomfort is therefore the concept where people start to feel uncomfortable in the environment that they’re in, the opposite of thermal comfort, as they’re too hot or too cold.
Air Velocity
Air Velocity is the speed of air moving across someone, which may help cool them if the air is cooler than the environment that they’re in. Air velocity is an important factor in thermal comfort, as the smallest of air movements can affect a person’s comfort. Air Velocity will affect people in a classroom environment because if it is a very cold day and the heating has been put on, the air in the room may become still or stagnant which may cause people to feel stuffy. It may also lead to a build-up in odour, which affects their...