Condensers

Question 1

Types of condenser splits

Answer 1

Remote refrigeration (10-30 degrees)
High efficiency (15 degrees)
Commercial freezer (20 degrees)
Standard fridge and AC (30 degrees)

Question 2

1 foot of vertical piping effects PSI how ?

Answer 2

1/2 psi decrease per foot of vertical pipe

Question 3

Condenser split = what ?

Answer 3

Condensing temp - air entering temp

Question 4

Fan cycle control is what ?

Answer 4

Pressure switch that controls the condenser fan

Question 5

Flooded condenser is what ?

Answer 5

1. Uses a diverting valve to hold back refrigerant.
2. Raises head pressure
3. Bypasses hot gas (and some liquid) to the receiver.

Question 6

How does low ambient effect condensers?

Answer 6

Can lower head pressure which in turn causes metering problems.
(Low ambient is typically below 60 degrees )

Question 7

How does water and refrigerant flow in a water cooled condenser ? (Tube and tube)

Answer 7

1. Water flows in centre tube
2. Refrigerant flows in outer tube
3. Water and refrigerant flows in opposite directions

Question 8

What are the two coil types of water cooled condensers ?

Answer 8

1. Coil, two separate tubes, one inside the other
2. Flange, two separate tubes in straight section, has a removable flange for cleaning

Question 9

What does a water regulating valve do ?

Answer 9

Controls water flow based on refrigerant pressure.

Question 10

Waste water uses how many gon/ton?
Normal water uses how many gpm/ton?

Answer 10

1. 1.5 gpm/ton
2. 3 gpm/ton

Question 11

Typical work done by the condenser ?

Answer 11

de superheating - 14%
Condensing - 81%
Sub cooling - 5%

Question 12

How to prevent co axial tube in tube from freeze up during evacuation or charging ?

Answer 12

Maintain water flow or drain the coil

Question 13

How to clean tube in tube (co axial coil)?
How to clean parallel tube coil ?

Answer 13

1. Co axially must be clean chemically
2. Parallel tube must be mechanically cleaned

Question 14

How to clean shell and coil tubes ?
How to clean shell and tube coils ?

Answer 14

1. Chemically
2. Mechanically

Question 15

Head pressure control methods

Answer 15

1. Pressure regulating valves
2. Condenser splitting
3. Condenser air louvers
4. Electric heat
5. Fan speed control and cycling

Question 16

Electric water valve

Answer 16

Solenoid type water valve
(Either fully open or fully closed)

Question 17

Motor Water Valve

Answer 17

Opens and closes valve using a tiny motor

Question 18

Pressure water valves

Answer 18

Regulates flow based on high side pressure (provides variable control)

Question 19

Thermostatic water valve

Answer 19

Typically used for baseboard heater
(Regulates water flow based on the temperature of water leaving the condenser)

Question 20

Open water loop = what ?

Answer 20

Condenser and cooling tower share same water

Question 21

Closed water loop = what ?

Answer 21

Heat exchange between condenser and cooling tower
(Do not share the same water)

Question 22

How to avoid freezing in cold ambient temperatures ?

Answer 22

1. Basin heater
2. Chemically treat the water
3. Insulation and or heat tracing on water piping