NRG 111 Flashcards
What is power?
The rate at which energy is transferred.
What is energy?
The ability to do work. It is the force that makes things happen.
What is the first law of thermodynamics?
That energy is neither created or destroyed.
What is the second law of thermodynamics?
Entropy. When energy is converted it becomes more disorganized.
What type of energy warms windows?
Radiant energy
What is s BTU
British Thermal Unit
How much energy from light in a building is assumed to be converted into energy?
100% the total kWh load
What is temperature?
Temperature is the average amount of kinetic energy contained within a substance.
What is thermal energy?
The total amount of kinetic energy contained within a substance
In what direction does NET energy travel?
From warm areas to cool areas.
How many ways is heat transfered?
What are they?
Three ways.
Conduction, convection and radiation
which wavelengths are associated with warmer temperatures?
Longer wavelength towards the visible end of the light spectrum.
What is sensible heat transfer?
Heat that results in a change in temperature.
What is latent heat transfer?
Heat that is released or absorbed during phase changes that does not result in a change in temperature.
What is latent heat of vaporization?
970Btu/lb
What is the latent heat of fusion?
144btu/lb
What is the boiling point of water?
212 degrees Fahrenheit
What happens during the evaporation process?
Heat is absorbed
What happens during the condensation process?
Heat is released
What is the technical term for the refrigeration cycle?
The vapor compression refrigeration cycle.
What is the unit outside of a house called?
The outdoor unit
What is the unit inside a house called?
The indoor unit
Can an outdoor unit act as both a condesor and evaporator?
Yes
What does a compressor do?
Gas goes in what in what end and comes out as what on the other?
It compresses then increasing pressure and therefore increasing temperature.
its compressed so it goes in cool on one end and hot on the other.
