Refrigeration Cycle

Basic Refrigeration Cycle

What is heat?

• A form of energy

What is cold?

• Absences of heat.

How does heat flow?

• High heat to low heat

Does cold flow?

• NO...!

How is heat measured?

• British Thermal Unit 

B.T.U

• Heat is a form of energy and is measured British in BTU’s.

Thermal Unit

A BTU is the quantity of heat required to

raise the temperature, of one pound of

(BTU) water, one degree Fahrenheit.

 What is Heat ?

•  Heat flows from high energy levels to a lower energy level.
•  Heat will not flow with out a temperature difference
• The greater the temperature difference, the faster the energy will flow.

Conduction

The transfer of heat from molecule to molecule through

Example:Heating one end of a copper tube a substance by

chain collision tube, will cause the other end to get hot. as shown in fig. (a,b)

                                                            fig a.

fig b

Convection

Heat transfer by the movement of molecules from

Example: Convection oven one place to

another.Forced air furnace. as shown in fig c

                                                         fig c .

Radiation

Radiation is vitality going through space.Sunshine is one of the most recognizable types of radiation. It conveys light, warmth and suntans. While getting a charge out of and relying upon it, we control our presentation to it.Beyond bright radiation from the sun are higher-vitality sorts of radiation which are utilized in prescription and which we as a whole get in low dosages from space, from the air, and from the earth and shakes.as shown in  fig e

                                                       fig e.