Nate Commercial

Question 1

What is the name of a evaporater barrel for a chiller

Answer 1

chiller barrel

Question 2

What are the 3 strategies to Absorb heat

Answer 2

1. Evaporator Air
2. Chiller Barrel
3. Thermal storage

Question 3

3 mass flows of HVAC

Answer 3

1. Heat absorption
2. Refrigerant Flow
3. Heat Rejection

Question 4

3 Funtions of refrigerant in HVAC

Answer 4

1. Absorption of Heat
2. Transfer of Heat inside the system
3. Rejection of Heat

Question 5

3 strategies for Rejecting heat

Answer 5

1. Air Cooled refrigerant condensers
2. Evaporative or Fluid (closed) refrigerant condensers
3. Open cooling towers

Question 6

what percentage of commercial ac are package units

Answer 6

60%

Question 7

Air cooled Coils in direct sunlight (south side) are not as efficient as coils that air cooled in shade (north side) because they gain_______.

Answer 7

Radiant heat.

Question 8

Too much oil inside an evaporator will interupt _______ and therefore capacity

Answer 8

heat exchange

Question 9

on an aircooled condenser, anytime the liquid line temp is lower than the ambient temp what is the cause

Answer 9

restriction up stream inside condenser. restriction acts as a metering device therefore cooling refrigerant.

Question 10

What strategy of heat rejection is the same as air cooled condensers except a mist of water is sprayed over. coil for increased efficency

Answer 10

evaporative cooled condenser cooling tower

Question 11

what is the btus/hr rejected in a ton of cooling on a cooling tower

Answer 11

aproximately 15,000 btus/hr

due to the additional heat of compression produced by the compressor and requirements of the systems’ compressor.

Question 12

What is a cooling tower

Answer 12

rejects heat to water that mixes with the air on the tube bundle or the fill. When heat tranfer from water to the air, the air carries it out to the atmosphere.

Question 13

when air stream mixes with water stream in cooling tower what happens to the air.

Answer 13

the air temprature rises and its relative humidity nears 100% and is rejected to the ambient air.

Question 14

What is the potential cooling potenitial difference between the a wet surface vs a dry surface

Answer 14

20 to 1

Question 15

What is the advantage of a cooling tower vs an air cooled condenser

Answer 15

more efficiency and capacity with less wear and tear than a typical air cooled condenser.

Question 16

What material is the fill made of

Answer 16

polyvinyl chloride (pvc) plastic or fiber reinforced polyester (frp)plastic

Question 17

What are the 2 methods of evaporate water

Answer 17

the splash method

the wetted surface method

both methods use fill