Articles Posted in the " Refrigerants " Category

  • FILLING BLANKS- REFRIGERANTS

    FILLING BLANKS- REFRIGERANTS

      FILLING BLANKS – REFRIGERANTS The gas which is a working substance in a refrigerating system is called the ————————-. Refrigerant is used for producing———————in the evaporator.  Chemical formula for R-22 is———————————.  Gas which serves as a medium of transferring heat from one place to ——is called refrigerant. Ammonia boils at —— and freezes at———-at […]


  • Azeotropes

    Azeotropes

     Azeotropes  Definition Azeotrope is a refrigerant consisting of two or more components in a fixed proportion by mass and behaves as a pure refrigerant by evaporating and condensing at fixed temperatures. For example R500, R-501, R-502, R-503. The very first Azeotrope found was named as R-500. Next azeotrope found was named as R-501 and so […]


  • mcq- Refrigerant Leakage

    mcq- Refrigerant Leakage

    mcq- Refrigerant Leakage Keywords: Halide torch-soap solution-electronic-vacuum test-pressure test Abstract The refrigeration system should be leak proof. Leakage in a system can be known by soap solution/halide torch/electronic detector. Before refilling of refrigerant into a system it must be ensured for leak proof by vacuum and pressure testing. Universal method of refrigerant leak detection is […]


  • mcq: Refrigerants

    mcq: Refrigerants

    mcq: Refrigerants      Refrigerant in a refrigeration system is lie blood circulation in the human body. It causes cooling by latent heat of vaporization. Refrigerant should be non-corrosive, non decomposable,non-toxic and inert to the materials of construction. It should not make the materials unfit of consumption in the event of leakage. it must be […]


  •  Interview Short Questions on Refrigeration 

     Interview Short Questions on Refrigeration 

     Interview Short Questions on Refrigeration   Thermodynamic properties of a refrigerant?  Transport properties of a refrigerant?  Chemical properties of a refrigerant?  Physical properties of a refrigerant?  Toxic properties of a refrigerant?  Economic properties of a refrigerant?  eco-friendly refrigerant?  Global Warming?  Ozone Depletion Potential of a refrigerant?  Clean Air Act of 1987 and 1990? Montreal Protocol of […]


  • * Interview Short  Question Answers on Refrigerants

    * Interview Short Question Answers on Refrigerants

    Interview Short Question Answers on Refrigerants What is a refrigerant? What are types of refrigerants? Refrigerant is a working substance in a refrigeration system. It absorbs heat at the lower temperature because of its very low boiling point. It loses heat to the surroundings at high temperature. This high temperature is reached with the help […]


  • * Short Interview Question Answers on safety

    * Short Interview Question Answers on safety

    Short Interview Question Answers on safety   180.  List the safety devices / safety precautions for a refrigeration unit? Against a low voltage: Use a low voltage cut out and cut-in. Against a high voltage: use a high voltage cut-out and cut-in. Against low refrigerant : Check for leakage if any, repair leakage and fill more refrigerant Against […]


  • * Refrigerant – Selection

    * Refrigerant – Selection

    Refrigerant–Selection A single refrigerant cannot be applied to all the applications because all the desireable properties are not possesed by any single substance over a wide range of temperature applications. Therefore selection is made based on the best combination of properties possessed by a refrigerant for a particular application. DESIREABLE PROPERTIES OF A REFRIGERANT  THERMODYNAMIC […]


  • Refrigerant Leakage

    Refrigerant Leakage

    Refrigerant Leakage TYPES OF LEAKAGES IN REFRIGERATION There are two types of leakages. (i)  External leakage (ii) Internal leakage External leakage: This leakage takes place when internal pressure is greater than atmospheric pressure which is quiet common. In this leakage, refrigerant goes out to atmosphere. If the leakage is not detectable (with most Freon’s) by […]


  • Specific Refrigerants

    Specific Refrigerants

    Specific Refrigerants  SPECIFIC REFRIGERANTS CFC (Cloro Floro Carbon) refrigerants.  CFC (Fully Chlori-fluorinated Hydrocarbon) Refrigerants like R-12, R-13—banned since 1996 Have longer life. Not flammable or non-explosive Low toxicity, noncorrosive, and compatible with other materials 4. Heat or high temperatures can cause these to break down into their elements (harmful to humans-respiratory system especially) 5.Harmful to environment […]