Articles Posted in the " Gas Refrigeration " Category

  • * Analysis of Simple aircraft cooling system—-2 Continued

    * Analysis of Simple aircraft cooling system—-2 Continued

    Analysis of Simple aircraft cooling system—-2 continued (iii) Calculation of T4 after the HEAT EXCHANGER T4 temperature after the cooler (heat exchanger) on the basis effectiveness of the heat exchanger which can be assumed as 80 % if not given. ЄHEX =( T3—T4)/( T3 — T2) = Actual temp drop/Theoretical temp drop possible (iv) Calculation of temperatures […]


  • *Short Interview Question Answer on Necessity of Aircraft Cooling

    *Short Interview Question Answer on Necessity of Aircraft Cooling

    Short Interview Question Answer on Necessity of Aircraft Cooling  Why Is The Necessity of Aircraft cooling? In an aircraft, cooling systems are required to keep the cabin temperatures at a comfortable level. Even though the outside temperatures are very low at high altitudes, still cooling of cabin is required due to: (i)  Large internal heat […]


  • * Short Interview Question Answers on Air Refrigeration

    * Short Interview Question Answers on Air Refrigeration

    Short Interview Question Answers on Air Refrigeration  Keywords: open-closed air cycle -dense-ram efficiency Abstract Air refrigeration is used only in air crafts because of safety and less load. Its COP is much less than 1 because the cooling effect is only due to sensible means as there is no phase change. The COP is much […]


  • * BOOT STRAP -REGENERATIVE AIRCRAFT COOLING SYSTEM

    * BOOT STRAP -REGENERATIVE AIRCRAFT COOLING SYSTEM

    BOOT STRAP – REGENERATIVE AIRCRAFT COOLING SYSTEM Boot Strap Air Refrigeration System: Two systems Without evaporative cooling, With evaporative cooling FIG. BOOT STRAP SYSTEM ON TEMPERATURE ENTROPY CHART In this there are two compressors, two heat exchangers and one turbine. Normally second compressor is run by the expansion turbine ‘T’. In case of evaporative cooling […]


  • *Analysis of aircraft cooling systems

    *Analysis of aircraft cooling systems

    Analysis of aircraft cooling systems FIG. SIMPLE AIRCRAFT COOLING SYSTEM ON TEMP -ENTROPY CHART  Analysis of Simple Aircraft Cooling System—-1 cP =1.005 k J/kg 0c cv =0.714 k J/kg 0c γ =  1.4 =Cp/Cv Rair=287 k J/kg K 1kWh =3600 k J 1HPh = 2650 k J Let V is the velocity of aircraft in […]


  • *Comparison of air refrigeration and vapor refrigeration

    *Comparison of air refrigeration and vapor refrigeration

    Comparison of air refrigeration and vapor refrigeration Keywords: Bell Coleman Cycle- reversed Rankine Cycle-cooling by sensible and latent heat Abstract Air refrigeration is based on bell Coleman Cycle and is used in all the air crafts. It causes cooling by sensible effect.Though it has a low COP but certain amount of power is saved in […]



  • * Short Interview Question Answers on  in Aircraft Refrigeration

    * Short Interview Question Answers on  in Aircraft Refrigeration

     Short Interview Question Answers on  in Aircraft Refrigeration  Q.  WHY IS AIR USED AS REFRIGERANT IN AIRCRAFT?  (i) Air is cheap, safe, non-toxic, non corrosive, innert and non-flammable. Leakage of air is not a problem (ii). Cold air from the turbine can directly be sent to cabin for cooling. Thus it eliminates the low temperature heat […]


  • * Short Interview Question Answers on Air Refrigeration

    * Short Interview Question Answers on Air Refrigeration

    Short Interview Question Answers on Air Refrigeration Before defining COP , two terms are to be understood. REFRIGERATING EFFECT OR COOLING EFFECT, N It is heat removed by 1 kg of refrigerant from the products to be cooled. It is represented by ‘N ‘. It is expressed as kJ/kg.  WORK INPUT TO A REFRIGERATING UNIT, […]


  • * Open and Closed Air Refrigeration Cycles

    * Open and Closed Air Refrigeration Cycles

    Open and Closed Air Refrigeration Cycles  TWO WAYS OF OPERATING OF BELL COLEMAN CYCLE (i) Open air refrigeration cycle: When cooled air from the turbine enters the cabin and comes in physical contact with the occupants. It is not much in use because of moisture added to air in the cabin. (ii) Closed air refrigeration cycle OR dense […]