Air and human comfort Air and human comfort Space explorations to the moon, other planets, and beyond have made people appreciate more than ever what a favoured planet the earth is. No other planet or satellite in our solar system possesses the unique mixture of gases that we call the earth’s atmosphere. The ocean of …
Heat transfer Heat transfer Air conditioning is concerned with heat flow processes. Heat is supplied to air in winter and removed from air in summer. These processes are energised from a variety of different sources and by the use of many different kinds of equipment. The actual processes of supplying and removing heat often cannot …
Heat energy and change of phase Heat energy and change of phase Comfort air conditioning systems add heat to air in the winter and remove heat from air in the summer. However, the heat exchanges that result in sensible temperature change are just one part of the total air conditioning function. Other processes, including the …
Air conditioning basic principles Air conditioning basic principles The basis for air conditioning practice lies in thermodynamics principles and processes of heating and cooling air on the laws of heat exchange from elementary physics, and both the design and operation of refrigerating and heating equipment. It is creating the desired “condition” of the air in …
Classification of air conditioning systems Classification of air conditioning systems There are several different ways of classifying air conditioning systems Classification as to major function. Air conditioning systems are of two basic types as far as their functions are concerned. Comfort air conditioning systems The purpose of these systems is to create atmospheric conditions conducive …
The Physiological Basis for Air conditioning The physiological basis for air conditioning Seasonal extremes of heat and cold are more than most people can endure, even in the temperate zone, in which large areas of the United States and Canada are located. Winter temperatures in some areas may run as low as minus 46°C. On …