AIR CONDITIONING SUMMARY Comfort and industrial processes use air conditioning. It increases the comfort to living beings and improve the quality of industrial products. Definition Of Air Conditioning It controls simultaneously four parameters, temperature, humidity, purity and velocity of air in a closed space. Further, air conditioning is cooling in summer, heating in winter with […]

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 towards right for specific humidity and towards […]

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. Dry Air It is a mixture of gases (mainly oxygen and nitrogen) which does not contain water vapor. Wet air Wet air or moist air is a […]

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 […]

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 […]

Cooling 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 […]

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

Refrigeration Evaporator-Fill in blanks It will improve the deep understanding of a evaporator used in refrigeration. Evaporators are the cooling unit in a refrigeration unit. Both dry and flooded evaporators produce cooling using latent heat. Evaporator used in the domestic units is called ————-evaporator. Commercial refrigeration uses an evaporator which is called ————-evaporator. Industrial  refrigeration […]

  Refrigeration Expansion valves-Fill in blanks This increases understanding in depth of the expansion valves. Expansion valves reduce the condenser pressure to evaporator pressure and also control the flow of refrigerant as per cooling requirements. FILL IN THE BLANKS FOR THE EXPANSION VALVES Various expansion valves control the flow rate of refrigerant and also ————the […]

Refrigeration Condenser-Fill in blanks This makes the understanding of condensers deep and clear. Thus, more fill in the blanks should be tried to further increase the knowledge. Condenser removes ——— and ——— heat.  Vapors change into liquid in the condenser at the  ———— temperature.   In the condenser, vapors change into liquid at a  ———temperature. During […]