Using Heat Flashcards
What is a Heating System?
A system used to change transfers of heat energy to make it hotter or colder.
Can Work create Heat?
Yes, rubbing your hands together is an example of this. In older times, people rubbed sticks in a stone with a hole in it to cause friction and start fires.
How is the Human Body a Heating System?
Unless you are sick, the body tends to keep a temperature that is about 98.6F. When you eat, some of the energy is stored is heat in the blood.
How does the body keep this Constant Temperature?
Heat Energy is constantly exchanged between the air and the skin. When it is cold, for example, energy will travel from the skin to the air so the body circulated warm blood to keep the temperature the same.
How does a modern Central Heating System work?
Modern Heating Systems have a furnace that burns gases or fuels. The energy released from the burning goes to either steam, water, or air. The freshly heated air/water/steam is then taken through insulated pipes to a radiator.
Hows does a Solar Heating System work?
First, panels on the roof of the house are used to collect energy from the sun. The energy from the sun is then used to heat up water or air and is sent through insulated pipes to a radiator.
How does a Passive Solar Heating System work?
The sun’s energy is absorbed through a panel on the roof, then pipes carry hot fluid throughout the house which is released through small vents. In sunny areas, these systems power themselves.
Does Usable Energy decreases in Transfers, and if so, why?
Yes; due to conduction and radiation, some energy is lost to the system’s surroundings.
What are some common building materials that reduce Energy Transfer?
Drywall, Cellulose Fiber, Flat Glass, and Fiberglass Batting.
What is a Cooling System?
Cooling Systems cool the air around to lower temperatures.
What is a Refrigerant?
A material used to cool the temperature of something to below the temperature of the environment.
What are most Refrigerators based on?
Most are based on evaporation.
If the Refrigerant warms up while going through the Fridge, how does it keep cooling?
There is a device that uses pressure to put the evaporated refrigerant back into liquid form. Air-Conditioning Systems work the same way.
How does a Refrigerator get rid of heat?
The now-heated refrigerant gas goes through several coils and the heat is let out at the bottom of the fridge.
What is a Heat Engine?
Machines that transfer heat into mechanical energy to do work.
