Articles Posted in the " Thermodynamics " Category

  • steam tables and charts

    steam tables and charts

    steam tables and steam charts Keywords: Isobaric lines-iso-thermals- constant dryness fraction lines- specific properties Need of steam charts Steam is in a vapor state which is widely different from a gas. No gas laws are applicable to vapor analysis. There are complex equations of state for a vapor. Consequently tables and charts have been prepared […]


  • Specific properties of water and steam

    Specific properties of water and steam

    Specific properties of water and steam Keywords:  enthalpy- dryness fraction- specific volume-entropy- internal energy Definition: Specific properties are per kg. Examples are specific volume, specific enthalpy, specific entropy, specific internal energy, specific latent heat. Symbol These specific properties are represented by the small alphabet like v, h,s,u,cP etc. Reference temperature for the enthalpy and entropy […]


  • Phase transformations

    Phase transformations

    Phase transformations Keywords: Sub-cooled solid- – phase change- sub-cooled liquid- saturated liquid, phase change, super heating PHASE TRANSFORMATION Phase transformation means change of ice to water and from water to steam. It takes place at constant temperature and at constant pressure. SUB-COOLED ICE Ice at a temperature lower than its freezing temperature 00C is called sub-cooled […]


  • Comparison Between Centrifugal And Axial Flow Compressors

    Comparison Between Centrifugal And Axial Flow Compressors

    Comparison Between Centrifugal And Axial Flow Compressors Keywords: Flow direction, Stage, pressure ratio, Operating parameters   Sr. No. ASPECT CENTRIFUGAL COMPRESSOR AXIAL FLOW COMPRESSOR 1. Flow direction Flow is axial at inlet and  radial at the outlet. Flow is in the axial direction 2. Maintenance requirement Requires less maintenance. Requires heavy maintenance. 3. Running cost […]


  • Comparison between reciprocating and rotary compressors

    Comparison between reciprocating and rotary compressors

    Comparison between reciprocating and rotary compressors Keywords: Pressure per stage- Volumetric flow rate – speed Sr. No. ASPECT RECIPROCATING COMPRESSORS ROTARY COMPRESSORS 1. Physical motion These employ piston cylinder device with to and fro motion. These employ an impeller with rotary motion. 2. Pressure rise per stage Discharge pressure is high and gives a pressure […]


  • KEY FEATURES OF STEAM ENGINES

    KEY FEATURES OF STEAM ENGINES

    KEY FEATURES OF STEAM ENGINES Keywords: Mean effective pressure, specific steam consumption Steam engine works with steam made in the boiler. It converts heat energy of steam into mechanical motion and then into electrical energy with the help of a generator coupled with the steam engine. The Rankine cycle is used in the analysis of […]


  • AIR COMPRESSORS

    AIR COMPRESSORS

      AIR COMPRESSORS Keywords:  Single – multi-stage compressors,  efficiency Air compressor increases the pressure and reduces the volume of air. It consumes electrical energy and converts it into potential energy in the form of increased pressure of air in the reservoir. There are many types of air compressors like reciprocating, rotary, low-medium and high pressure […]


  • PRACTICAL APPLICATIONS OF COMPRESSED AIR

    PRACTICAL APPLICATIONS OF COMPRESSED AIR

      PRACTICAL APPLICATIONS OF COMPRESSED AIR Keywords: Cleaning, pneumatic equipment Painting vehicles in an auto body shop Sand blasting in an auto body shop or in woodworking Making snow at ski hills or for entertainment uses Using pneumatic nail guns for roofing Providing dental and medical services Using pneumatic drills and hammers on construction sites […]


  • GAS POWER CYCLES AND VAPOR POWER CYCLES

    GAS POWER CYCLES AND VAPOR POWER CYCLES

     GAS POWER CYCLES AND VAPOR POWER CYCLES Power cycles mean those cycles which gives us net motion or electricity from heat supplied from some source in one form or the other. All power cycles are heat engine cycles. These operate on one cycle or the other. The efficiency depends on the manner the various processes […]


  • SOME IMPORTANT FACTS ABOUT ENTROPY

    SOME IMPORTANT FACTS ABOUT ENTROPY

    SOME IMPORTANT FACTS ABOUT ENTROPY Entropy is energy flow from order to disorder. Entropy is quantitative measure of disorder or randomness or chaos in a system. A highly ordered system has low entropy. Change of Entropy Only change in entropy’s’ is of importance in any process which is expressed as dS = dQ/T In a […]