22

Question 1

What are the three functions of the condenser?

Answer 1

De-superheat, subcool, condense vapor into liquid

Question 2

What is the state of the refrigerant as it exits the condenser?

Answer 2

High pressure high temp liquid

Question 3

The coil in a shell and coil condenser must be cleaned

Answer 3

Chemically

Question 4

In a water-cooled condenser with dirty condenser tubes, the temperature difference between the refrigerant and the leaving water will be ___
when the tubes are cleaned.

Answer 4

Greater than

Question 5

Where would you install the Open on Rise of Inlet (ORI) pressure valve?

Answer 5

Exit of the condenser and inlet of the receiver

Question 6

The following style(s) can be found in air-cooled condensers:

Answer 6

air blowing horizontally through
, taking air in at the sides and discharging out the top, vertical airflow pattern, taking air into the bottom and discharging it out the top

Question 7

Located at the inlet or outlet to the condenser. Used to control head pressure.

Answer 7

Air shutters

Question 8

Temperature at which a vapor changes to a liquid.

Answer 8

Condensing temp

Question 9

A combination water cooling tower and condenser.

Answer 9

Evaporative condenser

Question 10

Varies speed gradually according to head pressure or outside ambient temperature
changes.

Answer 10

variable frequency drive

Question 11

Cool below condensing temperature.

Answer 11

Subcooling

Question 12

More efficient than air-cooled condensers. Tube within a tube, shell and coil and shell and tube are examples.

Answer 12

Water cooled condenser

Question 13

Does not use a blower to move air through it but relies on natural prevailing breezes and must be located in the prevailing wind.

Answer 13

Natural draft tower

Question 14

Using heat from a condenser to heat a space or water.

Answer 14

Heat reclaim

Question 15

Rejects heat from the system into the atmosphere by evaporation of water.

Answer 15

Cooling tower

Question 16

Causes head pressure to rise in mild and cold weather to ensure consistent pressure for
feeding the metering device.

Answer 16

Condenser flooding

Question 17

Water added back into any circulating water system due to loss of water.

Answer 17

Makeup water

Question 18

Increased condenser surface area to condense vapor to liquid within 10°F of ambient.

Answer 18

High efficiency condenser

Question 19

The condensing temperature of the refrigerant in a high efficiency air-cooled condenser is approximately _
higher than the ambient air temperature.

Answer 19

15° F

Question 20

A water regulating valve helps to maintain a system’s head pressure by modulating
the flow of refrigerant through the condenser. T/F

Answer 20

F

Question 21

When head pressures are floated during the fall, winter and spring, less condensing heat is available for reclaim. T/F

Answer 21

T

Question 22

The ORD valve is located at the exit of the compressor and at the exit of the
condenser before the ORI valve connection. T/F

Answer 22

F

Question 23

When the evaporative condenser is used in cold climates, freeze protection must be provided. T/F

Answer 23

T

Question 24

If the spring pressure of a water regulating valve is increased, the system head
pressure will also increase. T/F

Answer 24

T

Question 25

In a shell and tube condenser, the water is pumped into the shell and the refrigerant passes through the tubes to condense. T/F

Answer 25

F

Question 26

_Fan cycling can either be controlled by pressure or temperature. T/F

Answer 26

T

Question 27

High head pressures from low ambients can cause insufficient refrigerant flow rates through metering devices, which in turn can starve evaporators. T/F

Answer 27

F

Question 28

ORI valves are non-adjustable. T/F

Answer 28

F

Question 29

Low suction pressures, short cycling, iced coils and inefficient cooling can also result from low head pressures. T/F

Answer 29

T

Question 30

In a recirculating water system condenser, the leaving water temperature is normally 15°F lower than the condensing temperature of the refrigerant. T/F

Answer 30

F

Question 31

An evaporative condenser uses air and water to de-superheat, condense and subcool the refrigerator. T/F

Answer 31

T

Question 32

A pressure tap on the ORD valve is used to adjust the opening pressure from the compressor. T/F

Answer 32

F

Question 33

If an air-cooled condenser's fan motor stops running, the head pressure will

Answer 33

Rise

Question 34

As the____ valve is throttling closed, the ____valve is opening up to allow pressure in the receiver to maintain proper receiver pressure, regardless of the outside ambient conditions.

Answer 34

ORI ORD

Question 35

What would be the sumptom if an air-cooled condenser had two fans and one stopped running?

Answer 35

High head pressure

Question 36

What can be used to maintain the head pressure of a system with a water-cooled condenser.

Answer 36

Water regulating valve

Question 37

What are the three types of cooling towers?

Answer 37

Natural, forced , evaporative draft

Question 38

The hot refrigerant gas from the compressor normally enters the condenser from the

Answer 38

Top

Question 39

Of the three types of cooling towers, which ones do not have the condenser located within the cooling tower?

Answer 39

Natural and forced/induced draft

Question 40

What methods are used to prevent the water in the cooling tower from freezing during the winter?

Answer 40

Heater, bubbler, chemicals, insulation

Question 41

Ambient air temperature entering an air-cooled high efficiency condenser is 90°F. What is the calculated temperature inside the condenser?

Answer 41

105° F

Question 42

the refrigerant used in the system in question 48 above was R-134a, what would be the expected pressure inside the condenser?

Answer 42

135 psig

Question 43

Explain three ways water can be lost in a cooling tower.

Answer 43

Leak due to blockage, wind, evaporation