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What is the state of refrigerant entering and leaving the condenser?
- Entering: high temp high pressure super heated vapor
- Leaving: high temp high pressure sub cooled liquid
What are the 3 types of water cooled condenser?
- Shell and tube
- Shell and coil
- Tube within a tube
What is the state of refrigerant entering and leaving the evaporator?
- Entering: low temp low pressure saturated liquid
- Leaving: low temp low pressure super heated vapor
What is the state of refrigerant entering and leaving the compressor?
- Entering: low temp low pressure super heated vapor
- Leaving: high temp high pressure super heated vapor
What are the 2 types of air cooling methods for evaporators?
Natural and forced convection
What are the 2 main types of evaporators?
Dry and flooded type
What are the four mechanical components of refrigeration system
Compressor, condenser, metering device, evaporator
When was the first mechanical domestic refrigeration system appear
Heat flows from
warmer substance to a cooler substance
Cause a change in state of a substance without a change in temperature of
Causes a change in temperature of a substance without a change in state
1 ton of refrigeration affects
What are the three types of heat transfers
Radiation, conduction, convention
The process whereby a solid will change state to a vapor without going through a liquid state
What are the 3 saftey applications in refrigeration
Safety of operator, safety of the equipment, safety of contents
Tool used to join 2 pieces of tubing of the same size
Why should you not use a vacuum pump to the evacuate a pressurized system
It will blow the seals on the vacuum pump
3 types of electronic leak detectors
Electrochemical, ultrasonic, dielectric
What type of an environment should you not use an electronic leak detector?
6 defrosting method
- Hot gas defrost
- Non freezing solution
- Water defrost
- Electric heater
- Reverse cycle defrost
- Warm air defrost
What are the different types of refrigerant controls.
- Capillary tube
- Automatic expansion valve
- Thermostatic expansion valve
- Low side float
- High side float
What is the percentage of liquid refrigerant is changed to a vapor in the capillary tube
10 to 20
What is the temperature of the compressor greatly affected by
Heat of compression
What are the 5 basic types of compressors
Reciprocating, rotary, scroll, screw, centrifugal
What are the 2 basic types of rotary compressors
Stationary blade compressor, rotating blade compressor
Scroll compressors are commonly used in what
Residential air conditioning and heat pump applications
What are the 2 types of lubrication
splashed, force or pressured
What are the 3 types of refrigerant controls classes
Pressure, temperature, volume quantity
Automatic expansion valve is control by what
What are the 2 types of thermostatic expansion valve
Sensing bulb, thermal electric
Not enough liquid refrigerant in the evaporator
Too much liquid refrigerant in the evaporator
The capillary tube is controlled by what
Volume or quantity
The design of the kepler to systems depend on for variables
Tube lenght, inside diameter, tightness of winding, temperature of tube