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A refrigeration machine using R-12 as refrigerant operates between pressures 2.5 bar and 9 bar. The vapour entering the compressor is dry saturated and there is no subcooling in the condenser. If the
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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A sample of moist air has a dry bulb temperature of 25C and a relative humidity of 50%. the barometric pressure is 740 mm of Hg. without using psychrometric chart, calculate:
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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Explain with schematic the working of a refrigeration system with a single evaporator and two stage compression system, with a water intercooler and flash intercooler interposed between two stages.
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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The following data are given for the space to be air conditioned: Outside air conditions = 40 C DBT and 50% RH,inside design conditions= 26 C DBT and 50% RH 50%, Apparatus Dew point = 10 C;
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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Types of Cooling Tower
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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Methods of defrosting.
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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Write a short note on Thermoacoustic refrigeration
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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Variable refrigerant flow systems
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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Define: i)Relative humidity ii)Ton of refrigeration iii)Degree of saturation iv)Dew point temperature v)Coefficient of performance
refrigeration and air conditioning updated 9.0 years ago by gauravthikrul • 0
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Draw P-H and T-S diagram when the vapours are superheated at the end of compression and with under cooling of liquid
refrigeration and air conditioning updated 8.1 years ago by ddigantarroy • 0
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atmospheric air at 10 C WBT and 15 C DBT enters a heating coil whose temperature is 40 C DBT. the bypass factor of heating coil is 0.4. Determine DBT, WBT and RH of the air leaving the coil
refrigeration and air conditioning updated 4.0 years ago by phenjoisilab • 0
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For a sample of air having 22 C DBT relative humidity 30% at barometric pressure of 760 mm of Hg. Calculate i) Vapour pressure ii) Vapour density iii) Humidity ratio iv)Enthalpy
refrigeration and air conditioning updated 9.0 years ago by gauravthikrul • 0
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Describe vapour absorption refrigerant system using three fluids.
refrigeration and air conditioning updated 9.0 years ago by gauravthikrul • 0
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An air cooling system for a jet plane cock pit operates on the simple cycle. The cockpit is to be maintained at 25 C. The ambient air pressure and temperature are 0.35 bar and -15 C respectively.
refrigeration and air conditioning updated 9.0 years ago by gauravthikrul • 0
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What are the general rules to be followed in the design of ducts?
refrigeration and air conditioning updated 9.0 years ago by gauravthikrul • 0
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A vapour compression system using R12 works between -15 C and 35 C as evaporator and condenser temperature respectively. using P-H chart determine i)COP ii)Mass flow of refrigerant per TR
refrigeration and air conditioning updated 8.1 years ago by ddigantarroy • 0
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The design conditions for an air conditioned hall is
refrigeration and air conditioning updated 9.0 years ago by gauravthikrul • 0
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Aspect ratio of rectangular duct is 7 and its equivalent circular duct diameter is 100 mm. The ratio of longer side of rectangular duct to the diameter of circular duct is 2.6.
refrigeration and air conditioning updated 4.1 years ago by krithikkm200 • 10
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What is secondary refrigerant? where it used ? Explain its importance in big ice plant?
refrigeration and air conditioning updated 8.1 years ago by ddigantarroy • 0
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Explain need of aircraft refrigeration? Draw reduced ambient air refrigeration cycle with neat schematic and T-S cycle.
refrigeration and air conditioning updated 4.3 years ago by phenjoisilab • 0
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Following data is recorded for a reduced ambient air refrigeration system:
refrigeration and air conditioning updated 7.2 years ago by tapash.b24 • 0
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Find i) Mass of air bled from cooling turbine to be used for regenerative cooling ii) Power required for maintaining the cabin at the required condition; and iii) COP of the system.
refrigeration and air conditioning updated 7.2 years ago by tapash.b24 • 0
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Explain ASHRAE numbering system for refrigerants with example.
refrigeration and air conditioning updated 6.9 years ago by yashbeer ★ 11k
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Explain the working principle of thermostatic expansion valve with the help of neat diagram.
refrigeration and air conditioning updated 7.1 years ago by sushanth2071 • 0
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Explain the working of two stage compression with water intercooler and subcooler used for vapour compression system.
refrigeration and air conditioning updated 7.2 years ago by tapash.b24 • 0
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