Articles Posted in the " Gas Refrigeration " Category

  • Boot strap and Reduced Ambient Aircraft Cooling Systems

    Boot strap and Reduced Ambient Aircraft Cooling Systems

    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. In case of evaporative cooling in Boot strap, another water […]


  • Interview Short Question Answers on Aircraft Cooling

    Interview Short Question Answers on Aircraft Cooling

     Interview Short Interview Question Answers on 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 generation […]


  • Refrigeration-Air-Interview Short Question Answers

    Refrigeration-Air-Interview Short Question Answers

    Refrigeration-Air-Interview Short Question Answers Air refrigeration is used in all the air crafts. Its COP is less than 1 because of sensible cooling. Air is a safe refrigerant and requires less equipment. Q. Compare open cycle and closed cycle air Refrigeration systems. Why closed cycle is called a dense system?  OPEN CYCLE: The conditioned air […]


  • AIRCRAFT COOLING SYSTEMS

    AIRCRAFT COOLING SYSTEMS

    AIRCRAFT COOLING SYSTEMS Boot Strap Aircraft cooling : Two types Without evaporative cooling, With evaporative cooling   FIG.  Boot Strap  without evaporator   This Bootstrap system has two compressors, two heat exchangers and one turbine. Normally second compressor is run by the expansion turbine. System with evaporative cooling, there is  another water cooled heat exchanger  […]


  • *Analysis of Aircraft Simple Cooling System

    *Analysis of Aircraft Simple Cooling System

    Analysis of aircraft simple cooling system Refrigerant is air in all the systems of the aircraft cooling systems. FIG. SIMPLE AIRCRAFT COOLING SYSTEM ON TEMP -ENTROPY CHART  Mathematical analysis of Simple Aircraft Cooling System Properties of air are cP =1.005 k J/kg 0c cv =0.714 k J/kg 0c γ =  1.4 =Cp/Cv Rair=287 k J/kg […]


  • Refrigeration- vapor vs air

    Refrigeration- vapor vs air

    Refrigeration- vapor vs air 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 carrying only (1/10)th of refrigeration equipment load as compared to that in vapor compression refrigeration. Air […]


  • Air Refrigeration Interview Short Question Answers

    Air Refrigeration Interview Short Question Answers

       Air Refrigeration-Interview Short Question Answers DEFINE 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 k J/kg.  GIVE DEFINITION OF WORK INPUT TO A REFRIGERATING UNIT, W Work input is work required […]


  • Refrigeration-Air Cycles-Open and Closed

    Refrigeration-Air Cycles-Open and Closed

     Refrigeration-Air Cycles-Open and Closed  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 cycle: When cooled […]


  • Air Refrigeration

    Air Refrigeration

     Refrigeration-Air Air refrigeration is used for cooling of all types of air-crafts in the world. MOST IMPORTANT FEATURES OF AIR AS REFRIGERANT IN AIR-CRAFTS (i)  Air is safe and cost free. (ii)  Light weight equipment: It requires only 2kg equipment /ton of refrigeration against 25 kg equipment/per ton of refrigeration in vapor compression refrigeration system. […]