Define (1) 1 TON of refrigeration (2) COP (3) Refrigerant
[3 marks]Write Merit and Demerit of Air Refrigeration System.
[4 marks]An air refrigeration open system operating between 100kPa and 1 MPa is required to produce a cooling effect of 2100kJ/min. Temperature of air leaving the cold chamber is -6°Cand leaving the cooler is 28°C. Neglect losses in the compressor and expander. Determine: (1) Mass of air circulated per min, (2) Compressor work, Expander work, Net work done, (3) COP and Power required in kW.(Take Cp=1.005 kJ/kg K & γ = 1.4 for Air).
[7 marks]What is cascade refrigeration system?
[3 marks]Differentiate vapor compression system and vapor absorption system
[4 marks]Explain and Derive the equation of COP for multi evaporator at different temperature with individual expansion valve and back pressure valve with neat sketch and P-Hdiagram.
[7 marks]Explain and Derive the equation of COP for multi evaporator at different temperature with multiple expansion valve and back pressure valve with neat sketch and P-Hdiagram.
[7 marks]Explain in brief shell and tube condenser.
[3 marks]Advantages and dis advantages of centrifugal compressor over reciprocating compressor.
[4 marks]Explain Lithium Bromide absorption refrigeration system with neat sketch.
[7 marks]What is the main function of Evaporator in refrigeration system? List out different types of Evaporators.
[3 marks]Explain in brief capillary tube and thermostatic expansion valve.
[4 marks]Explain Ammonia-Water absorption refrigeration system with neat sketch.
[7 marks]Explain in brief flywheel effect of building material.
[3 marks]Define term Human comfort and Explain factor affecting human comfort.
[4 marks]Explain with suitable example how cooling load of a confined space is calculated with load estimation sheet.1
[7 marks]Give classification of cooling and heating load analysis.
[3 marks]Define term effective temperature and Explain factor affecting effective temperature.
[4 marks]Asmall office hall of 25 persons capacity is provided with summer air conditioning with following data:- Outside condition:- 34°C DBT and 28°C WBT Inside condition:- 24°C DBT and 50% RH Volume of air supply=0.4 m3/min/person Sensible heat load in room =125600 kJ/hr Latent heat load in room =42000 kJ/hr. Find sensible heat factor of room. Use Psychrometric chart.
[7 marks]What do you understand by Static regain method in duct design?
[3 marks]Draw schematic diagram of summer air conditioning system.
[4 marks]Aduct distribution system supplying air to a house is shown in figure below, Estimate the diameter and velocity pressure in AB,BC,CD,BE and CF by using equal friction pressure drop Method.
[7 marks]What do you understand by Velocity reduction method for duct design?
[3 marks]Draw schematic diagram of Winter air conditioning system.
[4 marks]Circular duct of 40 cm is selected to carry in air conditioned space at a velocity of 440 m/min to keep noise level at a desired level. If this duct is replaced by a rectangular duct of aspect ratio of 1.5. Find out size of a rectangular duct for equal friction method when (1) velocity and (2) discharge rate of air in two duct is same. ``````````````2
[7 marks]