Articles Posted in the " Thermodynamics " Category

  • Steam tables and charts

    Steam tables and charts

    STEAM TABLES AND 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 for the steam vapors for making analysis simple and time saving.  STEAM TABLES Only […]


  • Specific properties of water and steam

    Specific properties of water and steam

    Specific properties of water and steam Definition Specific properties are per kg. Examples are specific volume, specific enthalpy, specific entropy, specific internal energy and 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 of water is 00C. Enthalpy of water […]


  • Phase transformations

    Phase transformations

    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 respectively. SUB-COOLED ICE Ice at a temperature lower than its freezing temperature 00C is called sub-cooled ice. Hence ice at -60C, -130C, -290C will be sub-cooled ice. Consequently ice at -60C […]


  • Centrifugal And Axial Flow Compressors

    Centrifugal And Axial Flow Compressors

    Centrifugal And Axial Flow Compressors 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 Running cost is low. Running cost is high. 4. Pressure ratio […]


  • Reciprocating and rotary compressors

    Reciprocating and rotary compressors

    Reciprocating and rotary compressors 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 ratio of 4 to 7 per stage. Discharge pressure is low […]


  • KEY FEATURES OF STEAM ENGINES

    KEY FEATURES OF STEAM ENGINES

    KEY FEATURES OF STEAM ENGINES                         Working Steam engine works with steam made in the boiler. It converts heat energy of steam into mechanical motion. Then it is converted into electrical energy. It is achieved  with the help of a generator coupled with the […]


  • AIR COMPRESSORS

    AIR COMPRESSORS

      AIR COMPRESSORS Function Air compressor increases the pressure and reduces the volume of air. It consumes electrical energy. It                             increases the pressure and temperature.                      Types of compressors There are many types […]


  • APPLICATIONS OF COMPRESSED AIR

    APPLICATIONS OF COMPRESSED AIR

    APPLICATIONS OF COMPRESSED AIR Used for 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 Powering various air tools […]


  • GAS  AND VAPOR POWER CYCLES

    GAS AND VAPOR POWER CYCLES

     GAS 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 are carried […]


  • ENTROPY

    ENTROPY

    ENTROPY SOME IMPORTANT FACTS ABOUT ENTROPY Entropy is energy flow from order to disorder. However, entropy is quantitative measure of disorder or randomness or chaos in a system. Thus, a highly ordered system has low entropy. 1.1 Change of Entropy Rather change in entropy is of importance in any process. In turn, it is expressed […]