Exam 3 Flashcards
The refrigerant in the condenser in a refrigeration system does what?
Rejects heat
The condenser in a refrigeration system
Desuper heats the vapour…
Condenses the vapour from the compressor
SubCool the liquid refrigerant before it leaves…
From the compressor
The condense
And normally operating water cold condensers operating with a 10°F differential between water in and water out. Is scale forms on the water tubes in the entering water is 85°F which of the following is possible?
Outlet water temperature will be lower than expect
And system head pressure will rise
In a water, cool condenser with dirty condenser tubes the temperature difference between the refrigerant and the water will be when the tubes are clean?
Greater than
The water circuit in shell and coil and tube within a tube coil condensers must be cleaned by what method?
Chemically
In a water, cool condenser, a regulating valve is used to control the…
Refrigerant head pressure
What can be used to maintain the head pressure system with the water glue condenser?
A water regulating valve
The typical design temperature for the water entering a recirculating water system condenser is 85°F and most systems have a white degree rise across the condenser?
10°
What is the most important parameter in cooling tower selection?
Entering wet bulb temperature
What is the importance of condenser subcooling?
It prevents flashing in the liquid line
True or false: the desired water flow through a condenser connected to a recirculating water system is approximately 3 gallons per minute per ton of refrigeration
True
What problem will happen if head pressure drops too low
The metering device will not be properly
If the compression ratio office system with the reciprocating compressor decreases the amount of refrigerant pump by the compressor, will…
Will increase
Most of the heat energy in the suction vapour entering the compressor is is what
Superheated from the evaporator
The temperature of the compressed gas leaving the compressor can best be described as
Very warm
Rotary compressors are used primarily in
Residential and light commercial air conditioning