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Refrigeration Fundamentals. Part 1. Heat and Heat Transfer презентация
Содержание
- 1. Refrigeration Fundamentals. Part 1. Heat and Heat Transfer
- 2. Sect. 1 What is Refrigeration?
- 3. Sect. 1 DEFINITION ‘Refrigeration’… …is the
- 4. Sect. 1 HEAT REMOVAL If heat is
- 5. Sect. 1 WHAT IS HEAT? A Form
- 6. Sect. 1 WHAT ARE REEFERS? Machines that ‘Move Heat’
- 7. Sect. 1 ‘HOW’ DOES HEAT MOVE?
- 8. Sect. 1 ‘HOW’ DOES IT MOVE? Heat
- 9. Sect. 1 CONDUCTION Heat moves through Solids
- 10. Sect. 1 CONDUCTION Heat
- 11. Sect. 1 CONDUCTION
- 12. Sect. 1 Any other Examples of Conduction?
- 13. Sect. 1 CONVECTION Definition - Heat transfers
- 14. Sect. 1 ‘NATURAL’ CONVECTION
- 15. Sect. 1 ‘NATURAL’ CONVECTION
- 16. Sect. 1 ‘FORCED’ CONVECTION
- 17. Sect. 1
- 18. Sect. 1 Any other Examples of Convection?
- 19. Sect. 1 RADIATION Moves in Straight Lines…
- 20. Sect. 1 RADIATION
- 21. Sect. 1 RADIATION
- 22. Sect. 1 Any other Examples of Radiation?
- 23. Sect. 1 HEAT TRANSFER SYSTEMS Usually combine ‘Conduction’ AND ‘Convection’ to move heat. i.e….
- 24. Sect. 1 TERMS TO REMEMBER Refrigeration Heat Box Conduction Convection Radiation
- 25. Sect. 1 HOW IS HEAT ‘MEASURED’? Four
- 26. Sect. 1 TEMPERATURE Is the Level or
- 27. Sect. 1 TEMPERATURE The temperature inside the
- 28. Sect. 1 SENSIBLE HEAT Is Heat you
- 29. Sect. 1 BRITISH THERMAL UNIT Measure of
- 30. Sect. 1 SPECIFIC HEAT Amount of heat
- 31. Sect. 1 SPECIFIC HEAT EXAMPLES Water -
- 32. Sect. 1 TERMS TO REMEMBER Temperature Box Temperature Ambient Temperature Sensible Heat Btu Specific Heat
- 33. Sect. 1 Questions?
Sect. 1 What is Refrigeration?
Слайд 3Sect. 1
DEFINITION
‘Refrigeration’…
…is the transfer of heat from a place where it
is ‘not wanted’…
… to a place where it is ‘unobjectionable’.
… to a place where it is ‘unobjectionable’.
Слайд 4Sect. 1
HEAT REMOVAL
If heat is removed from inside the container ‘faster’
than it enters...
…The internal temperature becomes colder.
Слайд 5Sect. 1
WHAT IS HEAT?
A Form of Energy
It Exists ‘Everywhere’
It Exists at
‘All Temperatures’…Except…
Absolute Zero (-459º F / -273º C)
It can be Moved from ‘Place to Place’
Absolute Zero (-459º F / -273º C)
It can be Moved from ‘Place to Place’
Слайд 7Sect. 1
‘HOW’ DOES HEAT MOVE?
Warmer ⇒ Colder - ALWAYS!!!!!!!
Heat
Heat
Heat
‘Faster’ with Large
Temp. Difference
Слайд 8Sect. 1
‘HOW’ DOES IT MOVE?
Heat can move three (3) ways….
1. Conduction
2.
Convection
3. Radiation
3. Radiation
Слайд 10Sect. 1
CONDUCTION
Heat will move Between Solids and / or Fluids
in direct contact with one another
Слайд 13Sect. 1
CONVECTION
Definition - Heat transfers via the circulation (movement) of a
fluid. i.e…..
Air is a fluid
Refrigerant Liquid & Vapor are fluids
Types
‘Natural’ Convection
‘Forced’ Convection
Air is a fluid
Refrigerant Liquid & Vapor are fluids
Types
‘Natural’ Convection
‘Forced’ Convection
Слайд 19Sect. 1
RADIATION
Moves in Straight Lines… like light
Does not heat the air
it passes through
Raises temperature of the substance that absorbs it
Dark colors absorb ‘more’ heat…
Light colors absorb ‘less’ heat
Raises temperature of the substance that absorbs it
Dark colors absorb ‘more’ heat…
Light colors absorb ‘less’ heat
Слайд 23Sect. 1
HEAT TRANSFER SYSTEMS
Usually combine ‘Conduction’ AND ‘Convection’ to move heat.
i.e….
Слайд 25Sect. 1
HOW IS HEAT ‘MEASURED’?
Four (4) Ways….
Temperature
Sensible Heat
British Thermal Unit (BTU)
Specific
Heat
Слайд 26Sect. 1
TEMPERATURE
Is the Level or Intensity of heat energy
Is measured
in degrees
Fahrenheit or Centigrade
Fahrenheit or Centigrade
Can be ‘Felt’ or ‘Sensed’
Слайд 27Sect. 1
TEMPERATURE
The temperature inside the controlled space (container) is called….
Box Temperature
AMBIENT
AMBIENT
AMBIENT
AMBIENT
The
temperature surrounding the
Container is called…
Container is called…
Слайд 28Sect. 1
SENSIBLE HEAT
Is Heat you ‘Can Feel’
Is measured with a
Thermometer
Causes a change in
Temperature
Слайд 29Sect. 1
BRITISH THERMAL UNIT
Measure of the quantity (amount) of heat energy
Definition:
A Btu is the amount of heat required to raise the temperature of one (1) pound of water one (1) degree F
Слайд 30Sect. 1
SPECIFIC HEAT
Amount of heat required to raise the temperature of
one (1) pound of a ‘Specific Substance’ one (1) degree F.
Compared to Water (1.0)
The less heat required to change substance temp., the lower the Specific Heat
The more heat required to change substance temp., the higher the Specific Heat
i.e. 0.75
Слайд 31Sect. 1
SPECIFIC HEAT EXAMPLES
Water - 1.0
Aluminum - .22
Honey - .35
Cheese -
.50
Fresh Beef - .75
Vegetables - .90
Cucumbers & Watermelon - .97
Слайд 32Sect. 1
TERMS TO REMEMBER
Temperature
Box Temperature
Ambient Temperature
Sensible Heat
Btu
Specific Heat
