Unit 22 Quiz Flashcards
Coil of tubing packed into a shell and then closed and welded.
Shell and coil
Water in the inner tube removes heat from the refrigerant in the outer tube.
Tube-within-a-tube coil
System where water is used over and over such as chilled water or cooling tower system.
Recirculated water system
A water cooling tower that has a fan on the side of the tower that pushes air through the tower as opposed to an induced draft tower.
Forced draft tower
Rejects heat absorbed into the system from the evaporator.
Condenser
Water used once and then wasted down the drain.
Waste water system
Turns a condenser fan on and off to maintain a correct pressure within the system.
Fan cycling
Most expensive condenser but can be cleaned mechanically with brushes. Straight copper tubes fastened into an end sheet within a steel shell.
Shell and tube
Located at the inlet or outlet to condenser. Used to control head pressure.
Air damper
Removing heat from the superheated hot refrigerant gas down to the condensing temperature.
Desuperheating
One half used for winter operation and both halves used for summer operation.
Condenser splitting
What state is the refrigerant in when it leaves the condenser?
High pressure high temp liquid
Where is the evaporative condenser located?
Inside the cooling tower
What is the purpose of condenser flooding?
To keep pressure up inside the condenser
so that the correct amount of refrigerant
Reaches the metering device.
What are five ways to control head pressure?
- Dampers
- Condenser flooding
- VFD
4.Condenser splitting - Fan cycling controls
A high efficiency condenser coil operating with an ambient temperature of 95 F will condense refrigerant at what temperature?
95F + 15F = 110F
A cooling tower can be constructed with different types of fill material used to help cool the water. What are three types of fill material that can be used?
Redwood, Fiberglass, Plastic
Condensers can be air cooled or water cooled. What are three condenser configurations for a water cooled condenser?
Shell in tube, shell in coil, tube in tube
A water pressure regulating valve for a water-cooled condenser works like a thermal expansion valve (TXV). As head pressure increases, the water valve will ______ water flow through the condenser to keep the head pressure correct.
Increase
How is mineral buildup in the evaporative condenser controlled without using chemicals?
Blow down
Water boxes refer to _______.
The end caps of the shell and tube condenser
Water used to cool condensers can either be _______ or __________.
Wasted, recycled