GOEL INSTITUTE OF TECHNOLOGY AND MANAGEMENT
REFRIGERATION AND AIR CONDITIONING(EME-604)
Assignment-1
AIR REFRIGERATION SYSTEM
UNIT-I
Q1. What do you mean by C.O.P ?
Q2. What do you mean by relative C.O.P?
Q3.Find the C.O.P of a refrigeration system if the work input is 80 kj/kg and refrigeration effect
produced is 160 kj/kg of refrigerant flowing.
Q4.Give the definition of TONNE of refrigeration.
Q5.What is relation b/w C.O.P of refrigerator and heat pump?
Q6.Draw the reverse Carnot cycle for air refrigeration on T-S co-ordinate.
Q7.Draw the Bell-coleman cycle for air refrigeration on T-S co-ordinate.
Q8. Write the formula for C.O.P of Bell-coleman cycle or reversed Brayton cycle.
Q9.If the fish is supplied at a temperature of 303 K and the fish is stored in cold storage which is
maintained at 265K.Find the C.O.P of cold storage.
Q10.In a refrigerating machine,if lower temperature is fixed,thenhow can we increase the C.O.P
of the machine ?
Q11.The C.O.P for a reversed carnot refrigerator is 4 .Then what will be The ratio of its highest
temperature to thelowest temperature ?
Q12.Air refrigeration work on which cycles ,give the names only ?
Q13.What do you mean by DART for air refrigeration?
Q14.Draw T-S Diagram for the boot –strap air cooling system.
Q15.Draw T-S Diagram for Reduced ambient air cooling system.
Q16.If air craft has too high speed then which air cooling system is used?
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Q17.Which air cooling system is used for rockets?
Q18.What do you mean by turbine efficiency?
Q19. What do you mean by compressor efficiency?
Q20.Draw the boot-Strap air evaporative cooling system on T-S diagram?
Ravi mehrotra -15/01/2013
GOEL INSTITUTE OF TECHNOLOGY AND MANAGEMENT
REFRIGERATION AND AIR CONDITIONING(EME-604)
Assignment-2
VAPOUR COMPRESSION SYSTEM
UNIT-II
Q1.Draw the working diagram for the vapour compression system?
Q2.Give the names of expantion devices?
Q3.Draw the vapour compression system on T-s diagram.
Q4.What do you mean by dry and wet compression?
Q5.Draw the vapour compression cycle on P-H diagram?
Q6.Show the sub or under cooling on P-H diagram?
Q7.What is purpose of flash chamber?
Q8.Why intercooler is used in vapor compression system?
Q9.what is effect of suction pressure on vapour compression cycle?
Q10.What is effect of discharge pressure on vapour compression cycle?
Q11.Mention the advantages of vapour compression system over air refrigeration system.
Q12.What do mean by compound vapour refrigeration systems?
Q13. What do you understand by cascade vapour refrigeration system??
Q14.Draw the P-h diagram for two stage compression with intercooler?
Q15.Draw the working diagram for two stage compression with intercooler?
Q16.What are the requirements fot multistage vapourcompression system?
Q17.What is effect of subcooling on vapour compression system?
Q18.Enlist the methods for improvement of simple vapour compression system ?
Q19.Draw the working diagram for simple saturation cycle with sub-cooling of liquid refrigerant
byvapou refrigerant.
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Q20.What do mean by degree of superheat?
Ravi mehrotra -15/01/2013
GOEL INSTITUTE OF TECHNOLOGY AND MANAGEMENT
REFRIGERATION AND AIR CONDITIONING(EME-604)
Assignment-3
VAPOUR ABSORPTION SYSTEM AND REFRIGERANT
UNIT-III
Q1.In abrorbtionsystem compressor is replaced by which componenets?
Q2.what is the function of Absorber in absorption system?
Q3. What is the function of Rectifier in absorption system?
Q4.What is function of Analyser in absorption system ?
Q5.Enlist the name of refrigerant and absorbent in lithium bromide absorption system?
Q6.Draw the working diagram of absorption system.
Q7.Give the formula for themaximum C.O.P of absorption system.
Q8.What is the relation b/w heat engine efficiency and maximum C.O.P for absorption system?
Q9.If evaporator has to be maintained at 263 K and the temperature of condenser and
genrator are 303 K and 400 K respectively .the determine maximum C.O.P for absorption
system.
Q10.Enlist the various components of absorption system.
Q11.Draw the h-c diagram for adiabatic mixing.
Q12. What is significance of T-C diagram for binary mixture?
Q13.Enlist desirable properties of ideal refrigerant.
Q14.Give the chemical formula for R-12.
Q15.Give the No. of refrigerant for CHClF2.
Q16.What do you understand by secondary refrigerant?
Q17.What do you mean by Azeotrope refrigerant?
Q18.Enlist the name of C.F.C free refrigerant.
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Q19.Give the advantages of absorbtion system over compression system.
Q20.Write the thermodynamic requirements of refrigerant-absorbent mixture.
Ravi mehrotra -15/01/2013
GOEL INSTITUTE OF TECHNOLOGY AND MANAGEMENT
REFRIGERATION AND AIR CONDITIONING(EME-604)
Assignment-4
AIR CONDITIONING
UNIT-IV
Q1.Give the definition of relative humidity.
Q2. Give the definition of specific humidity.
Q3.Show the dew point temperature on T-s diagram.
Q4. Show the adiabatic temperature on T-s diagram.
Q5.What dounderstand by wet bulb temperature?
Q6.What is the meaning of By pass factor?
Q7.Draw sensible cooling on psychrometric chart.
Q8.Draw the sensible heating on psychrometric chart.
Q9.Give the formula for Contact ratio of efficiency of coil.
Q10.Show the adiabatic mixing on psychrometricchart .
Q11.Draw the working diagram for winter air conditioning system.
Q12.Write the formula for the S.H.F ( Sensible heat factor).
Q13.Write short notes on solar heat gain through outside walls and roofs.
Q14.Enlist the factors effecting Comfort air conditioning.
Q15.What do you understand by room apparatus dew point?
Q16.Give the formula for Grand sensible heat factor.
Q17.What do you understand by effective temperature.
Q18.How the heat is gained by infiltration?
Q19.Show cooling and dehumidification on psychrometric chart.
Q20.Give the formula for Degree of saturation.
Ravi mehrotra -15/01/2013
GOEL INSTITUTE OF TECHNOLOGY AND MANAGEMENT
REFRIGERATION AND AIR CONDITIONING(EME-604)
Assignment-5
APPLICATION OF REFRIGERATION AND AIR CONDITIONING
UNIT-V
Q1.What is difference b/w duct and pipe?
Q2.Write the formula for equivalent diameter of a circular duct for a rectangular duct when
velocity of air passing through both ducts is same.
Q3.Write the types of cooling towers?
Q4.What do you understand by air washer?
Q5.Draw the layout for room air conditioning.
Q6.Enlist the types of water cooler.
Q7.Draw ice plant layout.
Q8.What do mean by pasteurization in milk processing industries?
Q9.Write short notes on cold storages.
Q10.Explain various controls in domestic refrigerator.
Q11. Through how much mode of heat transfer ,the human body maintains its thermal
equilibrium with environment?
Q12.What is difference b/w industrial and comfort air conditioning?
Q13.State the factors determine human comfort.
Q14.The drgree of warmth and cold felt by human body depends mainly on which factor?
Q15.What do you mean by effective temperature in respect to human comfort?
Q16.Enlist the types of evaporator used in refrigeration?
Q16.Sketch any two expansion devices.
Q17.Enlist the types of condenser?
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Q18.Total pressure in ducts constitutes which components?
Q19.Enlist the types of compressors used in refrigeration and air conditioning.
Q20.What do you mean by humidifying efficiency?
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Ravi mehrotra -15/01/2013
Ravi mehrotra -15/01/2013