Condensor Flashcards
De superheat
Sensible Cooling of discharge reaper
Contains superheat, motor heat, and heat
First 10 to 15% of condenser
To condense
Removal of light and heat from the evaporator
Subcool
Sensible cooling of liquid refrigerant occurs in the last 5 to 10% of condense
Condenser split
The difference between condensing temperature minus air entering the condenser
Condenser splits very
Standard refrigeration and AC is 10 SEER or 30°
Commercial 20 to 25
High-efficiency 15 to 20
Remote refrigeration 10 to 30
Subcooling
Condensing temperature minus liquid line temperature
Subcooling prevents…
Flash, gas, and liquid line
1° of sub Cooling equals half percent increase system system efficiency
Condensed liquid can flash into vapour from
Pressure drop and added heat
Adding refrigerant…
Raises sub, Cooling
Low ambient
Air entering the condenser below 60
Low head pressure causes metering problems
The TEV would starve the evaporator
90° or below is low pressure
Two methods to control head pressure
Fan cycle control, and condenser flooding
Fan cycle
Wood head pressure falls the fan shuts off
When head pressure rises, the fan starts
Condenser flooding
Same as overcharging the unit
HP stands for head pressure regulating valve
It restricts liquid flow out of condenser back up, refrigerant in the condenser raises, head pressure and bypasses, hot gas to warm, cool liquid 
Cleaning condensers
Use a non-acid coil cleaner and use pump, sprayer pressure washer, steam or hot water hose
Indoor condensers
Clean condenser first and clip as hooks onto the condenser face mount of fibreglass air filter on the S hooks
Ice machines
Most have factory installed condenser filters
Microchannel condenser coil
Flat plates or channels, replace around tubing and new designs, increase condenser efficiency and condenser size is reduced
Tube tube water cooled condensers
Refrigerant flows in the outer tube
Flanged type
Two straight tubes one inside the other and flanges are moveable for cleaning
Coil type
Two coil tubes, one inside the other 
Regulating valve helps
Coldwater comes in and lowers head pressure condensing temperature so the regulating valves help maintain consistent of these 
If mineral buildup is more than 10°
You can adjust the water regulating valve with a service valve inch to adjust flow 
Where do minerals start to form?
We’re hot. Gas enters in the warm condenser water leaves.
Shell and tube water cooled condensers
Wastewatersystems
City water washed down drain
Use 1.5 gpm at 75 degrees
Recirculated systems (cooling towers)
Circulate 3gpm ton at 85 degrees
Fan at air outlet
Pulls air through tower
Cools water rejects heat
Fan pushes air
Through cooler
Evaporating water cools condenser
Which is inside the tower
Cooling towers are heat rejecters
They do not condense refrigerant and are not considered condensors
Water cooled condenser is part of
Water cooled chiller
Entering Wet Bulb Temp
Lowest temp that water can theoretically reach evaporation
Most important parameter in tower selection
Approach
Is difference between water leaving and entering wet bulb
7F is common
78 and 85 from approach
Range
Difference is difference temp in water leaving and entering of tower (9.4-10
Total Heat Rejection
Amount of sheet to be removed from the circulating water within the tower
It is equal to the refrigeration effect plus the work of compression
115-2118
Drifted or winded
Drift is air that gets in trained in the airflow and discharge to the atmosphere
Very small and very widely does not include water by evaporation
Proximately 0.00 0.00
Evaporation
For each pound of water cooling power evaporates it removes about 1050 BTU from the water that remains
Approximately one percent of tower GPM
Blow down or bleed off
Water contains impurities when it is evaporated. These impurities are left behind.
Bleed test is determined by specialist who are trained
Make up is amount of water
Required to replace normal losses caused by drift evaporation blowdown
Types of cooling towers
Natural draft, which is atmospheric and mechanical draft which has a induced drive-through and forced blow through
