Ac&r.txt

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Author:
scott.spears
ID:
268481
Filename:
Ac&r.txt
Updated:
2014-03-30 14:08:46
Tags:
881A AC
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Description:
WOBC 881A AC&R
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  1. 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
  2. What are the 3 types of water cooled condenser?
    • Shell and tube
    • Shell and coil
    • Tube within a tube
  3. 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
  4. 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
  5. What are the 2 types of air cooling methods for evaporators?
    Natural and forced convection
  6. What are the 2 main types of evaporators?
    Dry and flooded type
  7. What are the four mechanical components of refrigeration system
    Compressor, condenser, metering device, evaporator
  8. When was the first mechanical domestic refrigeration system appear
    1910
  9. Heat flows from
    warmer substance to a cooler substance
  10. Cause a change in state of a substance without a change in temperature of
    Latent heat
  11. Causes a change in temperature of a substance without a change in state
    Sensible heat
  12. 1 ton of refrigeration affects
    12000 BTU
  13. What are the three types of heat transfers
    Radiation, conduction, convention
  14. The process whereby a solid will change state to a vapor without going through a liquid state
    Sublimation
  15. What are the 3 saftey applications in refrigeration
    Safety of operator, safety of the equipment, safety of contents
  16. Tool used to join 2 pieces of tubing of the same size
    A swag
  17. Why should you not use a vacuum pump to the evacuate a pressurized system
    It will blow the seals on the vacuum pump
  18. 3 types of electronic leak detectors
    Electrochemical, ultrasonic, dielectric
  19. What type of an environment should you not use an electronic leak detector?
    Flammable
  20. 6 defrosting method
    • Hot gas defrost
    • Non freezing solution
    • Water defrost
    • Electric heater
    • Reverse cycle defrost
    • Warm air defrost
  21. What are the different types of refrigerant controls.
    • Capillary tube
    • Automatic expansion valve
    • Thermostatic expansion valve
    • Low side float
    • High side float
  22. What is the percentage of liquid refrigerant is changed to a vapor in the capillary tube
    10 to 20
  23. What is the temperature of the compressor greatly affected by
    Heat of compression
  24. What are the 5 basic types of compressors
    Reciprocating, rotary, scroll, screw, centrifugal
  25. What are the 2 basic types of rotary compressors
    Stationary blade compressor, rotating blade compressor
  26. Scroll compressors are commonly used in what
    Residential air conditioning and heat pump applications
  27. What are the 2 types of lubrication
    splashed, force or pressured
  28. What are the 3 types of refrigerant controls classes
    Pressure, temperature, volume quantity
  29. Automatic expansion valve is control by what
    Pressure
  30. What are the 2 types of thermostatic expansion valve
    Sensing bulb, thermal electric
  31. Not enough liquid refrigerant in the evaporator
    Starving
  32. Too much liquid refrigerant in the evaporator
    Flooding
  33. The capillary tube is controlled by what
    Volume or quantity
  34. The design of the kepler to systems depend on for variables
    Tube lenght, inside diameter, tightness of winding, temperature of tube

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