QUESTIONS AND VERIFIED ANSWERS ALREADY
PASSED
◉ What is a wet bulb temperature used for?
Answer: to measure the moisture in the air and air temp
◉ What is dew point?
Answer: point at which condensation occurs.
◉ What is pressure?
Answer: force per unit area
◉ What does PSIG stand for?
Answer: per square inch gauge
◉ The three methods of heat transfer are
Answer: convection, conduction
, and radiation
.
,◉ Heat always travel from
Answer: hot to cold
◉ What method does refrigerant reject heat
Answer: condenser
◉ What is the pressure of 410A at 30
F?
Answer: 97.5
◉ What is the temperature of 410A at 418 psig
Answer: 120
◉ In order list the three processes that refrigerant goes through in
the condenser
Answer: desuperheat, vapor to liquid, and subcooled
◉ In order list the two processes that refrigerant goes through in the
evaporator
Answer: evaporation, then vaporized.
, ◉ What are the differences between a heat pump and regular air
conditioner?
Answer: a heat pump has a reverse cycle refridgeration system
meaning allows hot gas where the cool gas is coming from but works
just like a ac system in the cooling system
◉ test esco section 1
An air cooled condenser condenses to liquid at
Answer: 20-30° above ambient
◉ An air cooled evaporator evaporates liquid to a vapor at
Answer: 35 below ambient
◉ Airflow across the evaporator should be
Answer: 450 cfm/ton
◉ Azeotropic Blend refrigerants need to be charged in
Answer: vapor,liquid
◉ How much heat is still in the air at 0°F?
Answer: 85%