Articles Posted in the " Refrigeration " Category

  • Summary of Air conditioning

    Summary of Air conditioning

    Summary of Air conditioning DEFINITION OF AIR CONDITIONING It is a process of controlling simultaneously four parameters, temperature, humidity, purity and velocity of air in a closed space. Air conditioning is cooling in summer, heating in winter with ventilation. PRACTICAL APPLICATIONS Air conditioning is required for comfort, food preservation, for a better accuracy measuring instruments […]


  • Psychrometric chart

    Psychrometric chart

    Psychrometric chart  This chart contain moist air properties. Construction Refer Fig. is a Psychrometric chart. Dry bulb temperature is the abscissa (along x-axis) and specific humidity is the ordinate (along y-axis) at 1 atmospheric pressure. It contains the following lines:Vertical lines for dry bulb temperature Horizontal lines for specific humidity and for dew point temperature. […]


  • Psychrometry

    Psychrometry

      Psychrometry  Definition Psychrometry is the study of the properties of moist air (dry air + water vapor). It includes the study of various temperatures, humidities and psychrometric processes. 1. Dry Air Dry air is a mixture of gases (mainly oxygen and nitrogen) which does not contain water vapor. 2. Wet air Wet air or moist […]


  • Refrigeration-Filling blanks

    Refrigeration-Filling blanks

    Refrigeration-Filling blanks  Oil separator An oil separator is always placed in the ————-line. Crank case A crank case heater is connected in such a way so that it is ———–when the compressor is off. Compressor The compressor is called the ————- of the refrigeration unit. Anemometer Anemometer is used to measure the ————–. Dehydrator Dehydrator […]


  • Refrigeration-Filling blanks – controls

    Refrigeration-Filling blanks – controls

    Refrigeration-Filling blanks – controls  Controls and safety devices in refrigeration are  extremely important to make the operation automatic and safe. Thermostat makes the motor off as soon as the pre-fixed temperature is achieved. Absence  of a thermostat will keep the refrigeration in working unnecessary resulting in the wastage of power without achieving any useful purpose. Safety […]


  • Refrigeration and air conditioning-Trouble shooting-2

    Refrigeration and air conditioning-Trouble shooting-2

    Refrigeration and air conditioning-Trouble shooting-2 UNIT RUNS CONTINUOUSLY Sr.No. Possible cause Check and remedy 1. Improper refrigeration Check for shortage/excess of refrigerant, poor condensation, choking in the refrigeration cycle, inefficient compressor, door leakage etc. and do the necessary repair or replacement 2. Adjustment of thermostat at very low temperature Note the thermostat setting and do […]


  • Refrigeration and air conditioning: Trouble shooting-1

    Refrigeration and air conditioning: Trouble shooting-1

    Refrigeration and air conditioning: Trouble shooting-1 UNIT DOES NOT RUN AT ALL Refrigeration unit runs but no cooling LESS COOLING BUT THE UNIT RUNS   CONTINUOUSLY RUNNING UNIT  TRIPPING OF THE UNIT TAKES PLACE  TIME AND AGAIN NOISY UNIT  UNIT DOES NOT RUN AT ALL Sr. No. Cause Check and remedy 1. No electric power supply […]


  • Refrigeration-Fill in blanks-Evaporator

    Refrigeration-Fill in blanks-Evaporator

    Refrigeration-Fill in blanks-Evaporator Evaporator used in the domestic units is called ————-evaporator. Commercial refrigeration uses an evaporator which is called ————-evaporator. Industrial  refrigeration uses an evaporator which is called ————-evaporator. The evaporator is fitted between —————- and —————-.  Degree of super heat in dry evaporators is ————–. But flooded evaporator require   ————–degree of super heat. […]


  • Refrigeration-Fill in blanks-expansion valves

    Refrigeration-Fill in blanks-expansion valves

      Refrigeration-Fill in blanks-expansion valves FILL IN THE BLANKS FOR THE REFRIGERATION EXPANSION VALVES Various expansion valves control the flow rate of refrigerant and also ————the pressure.  Expansion valve is fitted between the———–and the—————–.  Temperature of the refrigerant decreases in the expansion because of decrease in———-temperature.  Boiling point of the refrigerant increases with the —————–of […]


  • Refrigeration-Fill in blanks-condenser

    Refrigeration-Fill in blanks-condenser

      Refrigeration-Fill in blanks-condenser Fill in the blanks for the condenser, receiver, drier cum filter and cooling tower Condenser removes ——— and ——— heat. The change of vapors into liquid in the condenser takes place ———— temperature. When vapors change into liquid in the condenser ————-remains constant. During change of vapors into liquid in the […]