Andile M Thusi

Andile M Thusi Your trusted HVAC experts, dedicated to keeping your home and business comfortable year-round.

21/10/2025

Heat Travel In 3 Ways
1. Radiation
Sunrays,light waves etc.
2. Convection
Gas pipe lines,liquid pipes etc.
3. Conduction
Physical touch,physical contact, absorbing etc.

21/10/2025

Basic Refrigeration Principles.
-Refrigeration deals entirely with the transfer of heat.

Thermodynamic
-Is the branch of science dealing with the mechanical action of heat.

1.First Law
-Energy can be created or destroyed.

2. Second Law
-Heat travel from warm to cold.

Heat Energy
-Is energy in tansfer it never content to stand still but is always moving from warm body to a cooler body.
-Water freezes at 32°F and 0°C
-Water boils at 212°F and l00°C

*A BTU is the amount of heat necessary to raise one pound of water, one degree Fahrenheit.
-8,3 × (80 - 70) = 83Btu
-KCAL = 1KG > 1°C

21/10/2025

A Refrigeration System.

A refrigeration consists of 4 main part, which are.

1. COMPRESSOR .
-It primary role is to circulate the refrigerant(gas) through a closed system of coil and a compressor is a mechanical device that increases the pressure of a gas by reducing its volume.

2. CONDENSER.
-Play a crucial role in transferring heat from the refrigeration to the outdoor air.
-Is a part of refrigeration system that removes heat from the refrigerant gas and turns it back into a liquid .
-A device for reducing a gas or vapour to a liquid.

3.EVAPORATOR.
-is responsible for absorbing heat from the indoor air.
-Is a heat exchanger that cools the environment by absorbing heat from the air or substance being cooled.

The four most important refrigeration cycle.

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