Tpc 431 Flashcards
Refrigeration is the process of…
Cooling, lowering the temperature of a space or a substance to a level below that of the area around it
What is the basics of heat transfer?
When heat moves from one substance to another, it always goes from the warmer substance to the cooler substance
What are the two reasons for air conditioning?
Comfort air conditioning & Process air conditioning
Matter exist in three physical states, they are…
Solid, liquid, and gas
The state of a substance depends upon its?
Temperature and pressure, the process involves the addition or removal of heat
What is thermal kinetic energy ( sensible heat )?
This kind of heat energy is directly related to temperature, the “hotness” or “coldness” of the object. It can be sensed through physical contact
Temperature conversions for F to C?
C = 5/9 ( F - 32 )
What are the three different methods of heat transfer?
Conduction, Radiation, Convection
All substances that change from a liquid form to a vapor or a gas go through what stage?
Latent heat of vaporization
Where does the compressor discharge the vapor to in the system?
The condenser
When a vapor is at a temperature above its boiling point we say it is?
Superheated
What evaporators cool more efficiently than dry-expansion types?
Flooded evaporators
In refrigerant to liquid evaporators the chilled liquid usually acts as a…
Secondary refrigerant, and absorbs heat from the substance to be cooled
What maintains constant pressure in the evaporator?
An automatic expansion valve
The air properties that are important in psychometrics are?
Temperature, Humidity, Specific volume and Enthalpy
