Author: haroonkhan
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Classification of Air-Conditioning
Classification of air-conditioning may be made based on functional point of view and process point of view. 1. Functional Point of View Following are the two types of air-conditioning based on functional point of view. (i) Comfort Air-conditioning In this type of air-conditioning, air inside the room or the stipulated space is created so as…
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Terminologies
Following terminologies are used in air-conditioning: 1. Psychometrics It is the branch of science that deals with the study of mixture of dry air and water vapour and is also the subject connected with the study of the behaviour of moist air. 2. Dry Air It is a mechanical mixture of gases comprising of oxygen,…
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Purposes of Air-Conditioning
Air-conditioning of any building or space is adopted to satisfy one of the objects mentioned below. 1. Residential Buildings For human beings living in residential buildings, the conditioned air is expected to give a better health or to preserve and maintain the health, comfort and convenience. 2. Industrial Premises Industrial air-conditioning may be required to…
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AIR-CONDITIONING OF BUILDINGS
Air-conditioning primarily consists of refining air in order that it may be utilised to the best advantage of the user. The user may be human beings, materials, equipment, etc. Thus conditioned air would mean an atmosphere having controlled temperature, humidity and velocity condition with dust-free cleanliness to meet the requirement.
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INTRODUCTION
As the atmospheric conditions vary, there is a need to condition the air to suit the need of the occupants. This is done by the process of air-conditioning the air so as to simultaneously control temperature, humidity and movement of the air with due control on distribution and cleanliness. This requirement of occupants of a…
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Wiring of Buildings
The following are three types of wires: Now-a-days in most of the buildings concealed PVC conduit wiring is used. The PVC conduits may be laid on the surface or concealed. In both the cases care has to be taken to see that no water enters the pipes. In the case of concealed pipe, it is safe to surround the…
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Materials and Devices Used in Wiring
Following are the materials and devices used in the wiring of a building. 1. Cables Cables consist of copper of aluminium conductors surrounded by insulation. Aluminium conductors are used to reduce the cost but they are inferior in quality compared to copper cables. Now-a-days stranded wires are commonly used for better performance. Rubber or PVC insulation may…
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Distribution Circuits
In an ordinary building, for distribution of electricity from the consumer control unit to other points, the supply is divided into three separate types of circuits, viz., Red wires are used for the live wire whereas the neutral is black or blue and earth wires are green and yellow. In the circuit a phase changer…
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Single and Three-Phase Supply
The electricity from the sub-stations are stepped down through local transformers and supplied to nearby buildings as single-phase or three-phase supply (50 cycles per second at 220 volts between the phase and the neutral). Then the supply is 230 volts between a phase and a neutral and it is volts between the phases. In a single-phase…
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ELECTRICAL SUPPLY
Electrical power is provided to the building by the Government. Electricity is distributed in small towns and villages by overhead wires. But in large cities and towns the distribution is done through underground cables. The supply of electricity is including the cables up to the electric metre. In order to isolate the main supply from…