A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

25 kJ/kg

50 kJ/kg

100 kJ/kg

125 kJ/kg

25 kJ/kg

50 kJ/kg

100 kJ/kg

125 kJ/kg

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Brayton cycle

Reversed Joule cycle

Reversed Carnot cycle

Reversed Otto cycle

Reversed Brayton cycle

Reversed Joule cycle

Reversed Carnot cycle

Reversed Otto cycle

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Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant before passing through the condenser is

Saturated liquid

Wet vapour

Dry saturated vapour

Superheated vapour

Saturated liquid

Wet vapour

Dry saturated vapour

Superheated vapour

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Refrigeration and Air Conditioning
A refrigeration system

Rejects energy to a low temperature body

Removes heat from a low temperature body and delivers it to a high temperature body

None of the listed here

Removes heat from a high temperature body and delivers it to a low temperature body

Rejects energy to a low temperature body

Removes heat from a low temperature body and delivers it to a high temperature body

None of the listed here

Removes heat from a high temperature body and delivers it to a low temperature body

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Refrigeration and Air Conditioning
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

1/ B.P.F.

P.F. - 1

1 + B.P.F.

1 - B. P.F.

1/ B.P.F.

P.F. - 1

1 + B.P.F.

1 - B. P.F.

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Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Low pressure side near receiver

High pressure side close to receiver

Suction of compressor

Delivery of compressor

Low pressure side near receiver

High pressure side close to receiver

Suction of compressor

Delivery of compressor

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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Refrigeration and Air Conditioning In a vapour compression system, the condition of refrigerant before passing through the condenser is

Refrigeration and Air Conditioning A refrigeration system

Refrigeration and Air Conditioning In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

Refrigeration and Air Conditioning In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Refrigeration and Air Conditioning
In a vapour compression system, the condition of refrigerant before passing through the condenser is

Refrigeration and Air Conditioning
A refrigeration system

Refrigeration and Air Conditioning
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at