Articles Posted in the " Introduction to Refrigeration " Category

  • Laws of refrigeration

    Laws of refrigeration

    Laws of refrigeration Heat is abstracted in the evaporator from the products/space to be cooled. Heat is added by the compressor to raise its temperature and pressure. This enabled the refrigerant to lose heat in the condenser equal to the cooling effect and work input. High pressure helps the refrigerant to re-circulate and cause the cooling […]


  • Solders, Fluxes, Gaskets and Cleaning agents

    Solders, Fluxes, Gaskets and Cleaning agents

     Solders, Fluxes, Gaskets and Cleaning agents Solders are used to connect copper tubes.Flux used make the soldering easy and defect less. Lead and paper gaskets are used to reduce the leakage of refrigerants. Petrol,  carbon tetra-chloride and dilute hydrochloric acid are used for various cleaning purposes in refrigeration.   Solders used in Refrigeration and Air Conditioning A solder […]


  • Evaporation and Boiling

    Evaporation and Boiling

      Evaporation and Boiling Definition of boiling: It is a temperature at which a liquid starts changing into vapors and it remains constant till the whole liquid is changing into vapors. Normal boiling point is with respect to one atmospheric pressure. Boiling point and melting points increase with the increase of pressure and decrease with […]


  • *Mcq: Refrigeration – Liquefaction of gases

    *Mcq: Refrigeration – Liquefaction of gases

    Mcq: Refrigeration – Liquefaction of gases When air expands at room temperature (a) Heating is produced (b) Cooling is produced (c) Neither heating nor cooling is produced (d) None (Ans:b) When Hydrogen expands at room temperature (a) Heating is produced (b) Cooling is produced (c) Neither heating nor cooling is produced (d) None (Ans:a) When […]


  • Interview Short Question Answers on Basics of Refrigeration

    Interview Short Question Answers on Basics of Refrigeration

     Interview Short Question Answers on Basics of Refrigeration A compound gauge consists of a vacuum and a pressure gauge. Vacuum gauge is used on suction side whereas compound gauge is used on discharge side. Vacuum gauge can read both vacuum and positive pressures. Pressure gas can read only positive pressures. A piston ring connects the […]


  • * Interview Short Question Answers on Refrigeration

    * Interview Short Question Answers on Refrigeration

    Interview Short Question Answers on Refrigeration What is the meaning of condensing unit? Assembly of motor, compressor, condenser and receiver mounted on a single frame is called the condensing unit. 2.List the different names of high pressure in refrigeration? There are three different names of the high pressure. These are (a)  Head pressure (b) Discharge […]


  • * Relation Between COP, EER and SEER

    * Relation Between COP, EER and SEER

    RELATION BETWEEN COP, EER AND SEER COP = N/W N is the cooling effect say in watts W is the work input in watts EER The Energy Efficiency Ratio (EER) of a particular cooling device is the ratio of output cooling in Btu/hr to energy input in watts at a given single operating point. EER […]


  • * Basics of Refrigeration

    * Basics of Refrigeration

    Basics of  Refrigeration  BASICS OF REFRIGERATION Refrigeration is lowering of temperature as compared to the surrounding temperature. It is of three types. (a) Refrigeration producing temperature much above oC. Examples are water coolers and summer air conditioners. It is called high temperature refrigeration. (b) Refrigeration producing temperatures between -2oC and + 2oC. Such applications are […]


  • * Datum Level in Refrigeration

    * Datum Level in Refrigeration

    Datum Level in Refrigeration ASSUMED DATUM LEVEL FOR VARIOUS VAPOR REFRIGERANTS FPS units(–400 F) mks units( 00 C) SI units (-400 C)    hl=0 sl=0   hl=100 k cal/kg sl=1.0 k cal/kg 0 C   hl=0 sl=0 Where hl is enthalpy of liquid and sl is entropy of liquid respectively. FOR WATER, ASSUMED DATUM LEVEL  IN SI UNITS DATUM […]


  • Symbols in Refrigeration

    Symbols in Refrigeration

    SYMBOLS IN REFRIGERATION AND AIR CONDITIONING Symbols in refrigeration make the study simpler and easy. Standard symbols saves lot of time too. These help to increase the understanding deep and clear. A Area m 2 C Concentration of Low boiling component No units D Diameter m G Mass flux is Rate of mass flow per unit […]