Question 1. What Will Be The Relative Humidity At Saturation Point?
Answer :
Relative humidity = 100 %
· Question 2. Explain The Principle Of
Refrigeration?
Answer :
The operation is according to the
second law of thermodynamics - Heat can be made to flow from cold body to hot
body with the help of external source.
· Question 3. What Is Air Conditioners?
Answer :
Air Conditioner continuously draws
the air from the space to be cooled & cools it by the principle of
refrigeration and discharge it back to the same indoor space that need to be
cooled.
· Question 4. What Is Wet Bulb Depression?
Answer :
Wet bulb depression is the
difference between dry bulb temperature and wet bulb temperature.
· Question 5. Define Relative Humidity?
Answer :
Relative humidity is the ratio
between the actual moisture content of the air compared with the moisture
content of the air required for saturation at the same temperature.
· Question 6. What Is Refrigeration?
Answer :
Refrigeration is the process of
continuously cooling or extraction of heat from the atmosphere or surroundings
with the help of external work.
· Question 7. Difference Between The
Refrigeration And Heat Pump?
Answer :
Refrigerators ejects heat with work
input. But heat pumps gives heat with work input.
Refrigerator contains the heat pump,
it pumps the heat out so that your system remains cold.
· Question 8. What Is Sensible Heat Ratio
(shr)?
Answer :
The Sensible Heat Ratio (SHR)
express the ratio between the sensible heat load and the total heat load.
· Question 9. How Much Resistance Is Offered
To Heat Flow By Dropwise Condensation?
Answer :
Nill.
· Question 10. Why Rate Of Condensation Is
Higher On A Polished Surface Compared To Rusty Surface?
Answer :
Polished surface promotes drop wise condensation
and does not wet the surface.
· Question 11. What Is Mechanical
Refrigeration ?
Answer :
Producing cold by machine.
· Question 12. Classify The Different
Refrigeration Systems?
Answer :
It may be of the following three
types:
- Vapor Compression Refrigeration System
- Vapor absorption Refrigeration System
- Air Refrigeration Systems
· Question 13. What Are The Basic Units Of
Mechanical Refrigeration Systems?
Answer :
Refrigeration system has 4 basic
units
- An Evaporator – The cooling Unit
- A pump or Compressor
- A Condenser – The heat disposer
- A liquid mixing device – Expansion valve or cylinder or
capillary tube
· Question 14. Which Unit Produces Cooling
Effect In The Refrigeration System ?
Answer :
The evaporator
· Question 15. What Is The Unit Of
Refrigeration?
Answer :
As Power Unit of mechanical devices
is given by H.P , for electrical equipment the unit of power is kW or MW . In
the same way the unit of refrigeration is ” Tonnes of Refrigeration ”
· Question 16. What Is One Tonne Of
Refrigeration ?
Answer :
One Tonne of Refrigeration means
machine is capable of removing heat from a body equal to the heat absorbed by
one tonne of ice when it melts from 0 ° C to 0 ° C Water in 24 hours . Here one
tonne is equal to 2000 lb .
· Question 17. What Is The Capacity Of One
Tonne Machine In Mks System?
Answer :
In MKS system a machine having
capacity to produce cooling effect of 50 kcal/minute is known to be a “One
Tonne Machine”
· Question 18. Define Co-efficient Of
Performance?
Answer :
In case of engine the performance is
judged the efficiency of the engine. That is – Efficiency = Work Done / Heat
Supplied .
And in case of refrigeration the
process is first reversed that is we have to supply work to obtain lower
temperature or say for that removal of heat. Thus performance of
refrigeration is just reversed . That is – N/W
Where – N = The rate of heat
abstracted from the body in given time technically called “Net Refrigeration
Effect” and W = Work Done .
Thus COP = Net Refrigeration Effect
/ Work Done Supplied . This is Called Theoretical COP .
· Question 19. What Is Relative Cop ?
Answer :
It is the ratio of actual COP and
Theoretical COP
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