Articles Posted in the " Vapor Compression Refrigeration " Category

  • Refrigeration-Vapor compression

    Refrigeration-Vapor compression

    Refrigeration-Vapor compression Refrigeration is heat transfer from a low temperature to a high temperature. It cannot take place by itself. Vapor compression refrigeration system is used to achieve it. Its components, their functions and various processes to achieve refrigeration help in understanding the whole system. Sr.No. System part Process State of the refrigerant Heat gain […]


  • mcq-Refrigeration-vapor compression

    mcq-Refrigeration-vapor compression

    mcq-Refrigeration-vapor compression Most commonly used method of refrigeration is vapor compression refrigeration.Cooling capacity is the cooling produced per minute. Refrigeration is measured in tons of refrigeration. (1 ton = 211kJ/min of cooling effect). Cooling effect is caused by latent heat in vapor refrigeration while by sensible heat in gas refrigeration. Sub-cooling causes increase in COP […]


  • mcq:  Super heating and Sub Cooling

    mcq: Super heating and Sub Cooling

    mcq: Super heating and Sub Cooling Super heating as well as sub-cooling takes place at constant pressure. Super heat is applicable to the vapor phase. The sub cooling is applicable to liquid phase. Degree of super heat is used with (a) Solids (b) Liquids (c) Vapors (d) None (Ans:c) Standard degree of super heat is […]


  • Refrigeration-Vapor Compression-Interview  Short Question Answers

    Refrigeration-Vapor Compression-Interview Short Question Answers

    Refrigeration-Vapor Compression-Interview Short Question Answers Q. What is meaning of DRY compression? Dry compression: When the refrigerant vapor is dry saturated at the START of compression. Compression start from Dry  saturated vapor condition and ends in the super heated region as shown in the Figure by the process 1-2.   Figure: 1–2  Dry Compression on […]


  • * REVERSED CARNOT CYCLE

    * REVERSED CARNOT CYCLE

    REVERSED CARNOT CYCLE WHAT IS REVERSE CARNOT CYCLE? Reverse Carnot cycle will be  reverse of Carnot Cycle. It is also an ideal cycle. Reverse Carnot cycle consists of four processes in the sequence i.e. isothermal, isentropic, isothermal and isentropic processes.  An isothermal process has to be very very slow. An isentropic process has to be […]


  • Refrigeration-Air and Vapor-Short Interview Question Answers

    Refrigeration-Air and Vapor-Short Interview Question Answers

    Refrigeration-Air and Vapor-Short Interview Question Answers Q. What is Bell Coleman Cycle or Reversed Brayton Cycle or Reversed Joule Cycle or Gas Refrigeration Cycle?  It is a cycle which consists of two isen-tropic processes and two isobaric processes. Since in this cycle the working substance is air (OR gas) work of expansion is recovered in […]


  • * Short Interview Question Answers On Super heating and Sub-Cooling

    * Short Interview Question Answers On Super heating and Sub-Cooling

      Short Interview Question Answers On Super heating and Sub-Cooling  32. What is super heat OR degree of super heat? Difference of actual temperature and boiling temperature of a vapor at a certain pressure.For example: Normal Boiling Point (NBP) of R-22 is -410C at 1 atmosphere. Say in the vapor form it is at a temperature […]


  • * SHORT INTERVIEW QUESTION ANSWERS ON HEAT ENGINE / REFRIGERATOR / HEAT PUMP

    * SHORT INTERVIEW QUESTION ANSWERS ON HEAT ENGINE / REFRIGERATOR / HEAT PUMP

     SHORT INTERVIEW QUESTION ANSWERS ON HEAT ENGINE / REFRIGERATOR / HEAT PUMP Heat engine converts heat into mechanical motion/electricity. Refrigerator produces cooling effect.Heat pump produces heating effect. COMPARE HEAT ENGINE, REFRIGERATOR AND A HEAT PUMP WHEN WORKING ON CARNOT CYCLE OR REVERSE CARNOT CYCLE Heat Engine ηheat engine = (TH—TL)/TL COP refrigerator  = TL/(TH–TL) COP heat […]


  • Volumetric Efficiency

    Volumetric Efficiency

    Volumetric Efficiency NEED OF CLEARANCE IN THE CYLINDER Piston is moving in the cylinder. It is desirable that the piston does not strike the cylinder head cover. To achieve this there is a small space between the cylinder head and the extreme position of piston. The volume of this space is called clearance volume or […]


  • Refrigeration-Basics

    Refrigeration-Basics

      Refrigeration-Basics POINTS USED ON p-h chart, refer Fig. Point 1 outlet of evaporator as well as inlet of compressor Point 2 outlet of compressor as well as inlet of condenser Point 3 outlet of condenser as well as inlet of expansion valve Point 4 outlet of expansion valve as well as inlet of evaporator In the theoretical analysis, no super […]