Articles Posted in the " Refrigeration " Category

  • CRYOGENICS-LIQUEFACTION OF AIR

    CRYOGENICS-LIQUEFACTION OF AIR

    CRYOGENICS-LIQUEFACTION OF AIR Principle of Liquefaction Liquefaction of gases is achieved by employing. Joule Thomson expansion alone as in Linde’s process  or Isentropic expansion as well as Joule Thomson expansion as used in Claude’s process  Air liquefaction It is carried out with two processes. First is by Linde’s process and second is Claude’s process respectively. […]


  • THERMOSTATIC AND AUTOMATIC EXPANSION VALVES

    THERMOSTATIC AND AUTOMATIC EXPANSION VALVES

      https://www.mesubjects.net/wp-admin/post.php?post=386&action=edit       Nomenclature of refrigerants https://www.mesubjects.net/wp-admin/post.php?post=358&action=edit        Gas Refrigeration-1 https://www.mesubjects.net/wp-admin/post.php?post=483&action=edit       Q. Ans Air Refrigeration-2 https://www.mesubjects.net/wp-admin/post.php?post=415&action=edit         Q. Ans Refrigeration https://www.mesubjects.net/wp-admin/post.php?post=407&action=edit         Off and On controls-Refrigeration https://www.mesubjects.net/wp-admin/post.php?post=371&action=edit         Q. Ans Air Refrigeration-3 https://www.mesubjects.net/wp-admin/post.php?post=437&action=edit          Q Ans Super heating & sub-cooling   THERMOSTATIC AND AUTOMATIC EXPANSION VALVES Expansion valve in a refrigeration system is very important as it decreases the pressure as […]


  • ROTARY COMPRESSORS REFRIGERATION

    ROTARY COMPRESSORS REFRIGERATION

    https://www.mesubjects.net/wp-admin/post.php?post=6712&action=edit        Match columns and fill blanks refrigeration https://www.mesubjects.net/wp-admin/post.php?post=6702&action=edit       Q.A. Vapor Absorption Refrigeration-1 https://www.mesubjects.net/wp-admin/post.php?post=6700&action=edit       Refrigeration laws https://www.mesubjects.net/wp-admin/post.php?post=6419&action=edit        Industrial refrigeration and air conditioning  ROTARY COMPRESSORS REFRIGERATION 1.1 Definition This compressor compresses the refrigerant by the rotary motion of a roller. The roller is eccentrically mounted in an enclosed cylinder. 1.2 Function  The function is same as that […]


  • INDUSTRIAL REFRIGERATION AND AIR CONDITIONING

    INDUSTRIAL REFRIGERATION AND AIR CONDITIONING

      https://www.mesubjects.net/wp-admin/post.php?post=6712&action=edit        Match columns and fill blanks refrigeration https://www.mesubjects.net/wp-admin/post.php?post=6702&action=edit       Q.A. Vapor Absorption Refrigeration-1 https://www.mesubjects.net/wp-admin/post.php?post=6700&action=edit       Refrigeration laws https://www.mesubjects.net/wp-admin/post.php?post=6622&action=edit       Refrigeration Rotary Compressors INDUSTRIAL REFRIGERATION AND AIR CONDITIONING Comfort conditions are unique. Industrial refrigeration needs refrigeration over a wide range of temperatures. Most of comfort units are of less tonnage capacity as compared very high tonnage cooling […]


  • SENSIBLE HEAT FACTOR (SHF)

    SENSIBLE HEAT FACTOR (SHF)

     SENSIBLE HEAT FACTOR (SHF) There are many types of sensible heat factors. These are described below: (a) ROOM SENSIBLE HEAT FACTOR (RSHF) RSHF=RSHL/(RSHL+RLHL) =RSHL/TRHL where RSHL is room sensible heat load RLHL is room latent heat load  TRHL is total room heat load Example – Room Sensible Heat Factor – RSHF The sensible heat gain […]


  • *COOLING LOAD CALCULATIONS-1

    *COOLING LOAD CALCULATIONS-1

    COOLING LOAD CALCULATIONS ROOM LATENT HEAT LOADS (RLHL) RLHL = Room Latent Heat Loads are due to (i)  Latent heat load from occupants (assume 240 kJ/h/person) Qocc     = n x240          kJ/h n is the number of persons  (ii) Latent heat load from infiltrated air, it is due to the door openings in the AC room […]


  • COOLING LOAD CALCULATIONS-2

    COOLING LOAD CALCULATIONS-2

      CCOOLING LOAD CALCULATIONS-2 Cooling load calculations help to find the cooling capacity of a refrigeration plant for a certain application (cinema-library etc). These cooling loads consist of sensible and latent heat loads. Sensible heat loads are due to temperature difference. Latent heat loads are due moisture difference. Some of cooling loads are building transmission […]


  • AIR CONDITIONING UNITS

    AIR CONDITIONING UNITS

    AIR CONDITIONING UNITS Different cooling requirements use different types of refrigeration units. Domestic applications use window and split units. These are air cooled units. Commercial applications use packaged units which factory assembled and are water cooled. Room Air conditioners A room air conditioner is often called  as AC. It is also called a window air […]


  • REFRIGERATION EQUIPMENTS-2

    REFRIGERATION EQUIPMENTS-2

        https://www.mesubjects.net/wp-admin/post.php?post=4410&action=edit       Open and Hermetically sealed compressor units https://www.mesubjects.net/wp-admin/post.php?post=5065&action=edit      Refrigeration equipment-1 https://www.mesubjects.net/wp-admin/post.php?post=4198&action=edit      MCQ Vapor Compression Refrigeration https://www.mesubjects.net/wp-admin/post.php?post=4194&action=edit       MCQ non-conventional refrigeration REFRIGERATION EQUIPMENTS-2 Dry evaporators are used in domestic units. Flooded evaporators are in commercial and industrial units. Liquid suction heat exchanger ensures super heated vapor to compressor and sub-cooled refrigerant to the expansion […]


  • REFRIGERATION EQUIPMENTS-1

    REFRIGERATION EQUIPMENTS-1

      https://www.mesubjects.net/wp-admin/post.php?post=4410&action=edit       Open and Hermetically sealed compressor units https://www.mesubjects.net/wp-admin/post.php?post=5067&action=edit      Refrigeration equipment-2 https://www.mesubjects.net/wp-admin/post.php?post=4198&action=edit      MCQ Vapor Compression Refrigeration https://www.mesubjects.net/wp-admin/post.php?post=4194&action=edit       MCQ non-conventional refrigeration REFRIGERATION EQUIPMENTS-1 Reciprocating, rotary and centrifugal compressors are used for refrigerants having lower, medium and high boiling points. Air, water and evaporative condensers are used in domestic, commercial and industrial plants. Cooling tower cools […]