Reversed Carnot cycle
Reversed Otto cycle
Reversed Joule cycle
Reversed Rankine cycle
C. Reversed Joule cycle
Heated and dehumidified
Heated and humidified
Cooled and humidified
Cooled and dehumidified
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
System has high C.O.P.
Power per TR is low
Mass of refrigerant circulated in the system is low
Mass of the refrigeration equipment is low
Always less than unity
Always more than unity
Equal to unity
Any one of the above
Cooling
Heating
Dehumidifying
All of these
Reversed Carnot cycle
Bell Coleman cycle
Both (A) and (B)
None of these
R-11
R-12
R-22
Ammonia
R-11
R-12
R-22
Ammonia
Condenser
Evaporator
Compressor
Expansion valve
Saturated liquid
Wet vapour
Dry saturated vapour
Superheated vapour
Dew point temperature decreases
Wet bulb temperature decreases
Dry bulb temperature increases
All of these
Compressor
Condenser
Evaporator
Expansion valve
Cost is too high
Capacity control is not possible
It is made of copper
Required pressure drop cannot be achieved
Very little work input
Maximum work input
Nearly same work input as for vapour compression cycle
Zero work input
(C.O.P.)P = (C.O.P.)R + 2
(C.O.P.)P = (C.O.P.)R + 1
(C.O.P)P = (C.O.P)R - 1
(C.O.P)P = (C.O.P)R
After passing through the condenser
Before passing through the condenser
After passing through the expansion or throttle valve
Before entering the compressor
5°C
10°C
15°C
20°C
Increase
Decrease
Remain unaffected
May increase or decrease depending on the type of refrigerant used
1.86 kW
3.72 kW
7.44 kW
18.6 kW
Wet bulb temperature
Relative humidity
Dry bulb temperature
Specific humidity
Raise the pressure of the refrigerant
Raise the temperature of the refrigerant
Circulate the refrigerant through the refrigerating system
All of the above
Centrifugal
Axial
Miniature sealed unit
Piston type reciprocating
NN = hl/k
NN = μ cp/k
NN = ρ V l /μ
NN = V²/t.cp
Same
Low
Very low
High
Ensures the evaporator completely filled with refrigerant of the load
Is suitable only for constant load systems
Maintains different temperatures in evaporator in proportion to load
None of the above
Remains constant
Increases
Decreases
None of these
Automatic expansion valve
High side float valve
Thermostatic expansion valve
Low side float valve
High pressure saturated liquid
Wet vapour
Very wet vapour
Dry vapour
Horizontal line
Vertical line
Inclined line
Curved line
Colourless
Odourless
Non-flammable
All of these