Basic principles of refrigeration - Printable Version

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Basic principles of refrigeration - Pankaj Garg - 06-02-2019

Basic principles of refrigeration


Heat : A Form of energy : Thermodynamics is the field of science that studies and deals with the mechanical action of heat.

Cold : Absence of Heat : Lower intensities of heat have atoms oscillating slower, the material considered cold or cool

How heat flows :The second law of thermodynamics states that heat always moves from the warmer body to the colder object.

How heat Measured : It can be measured only by measuring the effect it has on a material, such as a change in temperature, state, size, color, etc. This measurement is sometimes referred to as work, heat content or quantity of heat.

Measurement of heat is done in calories. One calorie is the amount of energy required to raise one gram of water one degree Celsius.

Temperature :Temperature is a property of matter that indicates the concentration or intensity of heat in a material.

Temperature Scale :

Temperature scales are based on effects of heat on water with references to boiling and freezing points of water.
The Fahrenheit temperature scale has water boiling at 212° and freezing at 32° with absolute zero at –459°.
The Celsius temperature scale has water boiling at 100° and freezing at 0° with absolute zero at –273°.
Scientists and engineers use the Kelvin and Rankin scales with 0° reference point at absolute zero. Kelvin scales uses Celsius increments, and Rankin uses Fahrenheit increments.

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