| The Right
Air-Conditioners for the Right Place
can be broadly classified into domestic, commercial and industrial,
based on their applications.
Widely used, domestic air-conditioners come in two types:
window type and the split type. The split type is divided
into two units: the compressor, which is the heart of the
air-conditioner and also the noisier part which works outside
the room, and the evaporator which works inside the room.
The split type is more convenient because the noise of the
AC is kept well outside the room. Choosing an AC's tonnage
depends on where you instal it & the size of the room.
For an average sized living room or office cabin, you would
need a 1-ton or 1.5-ton AC. A 1-ton AC can cool approximately
180 sq. ft. If installed in a restaurant of the same proportions,
added tonnage is required since the head count and the body
heat are greater, increasing the load on the AC. For an office
set up, the best choice is an Air Cooled Split Ductable which
conveys cool air through ducts into space. This is recycled
with some fresh air. If soft water and space for a cooling
tower are available, go for water-cooled self-contained units.
For rooms with computers and in electronic telephone exchanges,
where control of temperature, humidity and air cleanliness
are important, close control units of 7.5 tons to 10 tons
are recommended. If your AC is exposed to sunlight, insulate.
Reduce glass area in a room with an AC, since glass allows
a lot of heat inside. Always allow for free circulation of
air behind the condenser.
An Electrical Contractor Should Possess A License From
Choosing an electrical contractor :
you have your job requirements ready, ask for quotations from
well-established contractors. Remember, the lowest price is
not always the best.
Hire only a contractor who possesses a valid license from
the state government.
Check if he has sound technical background. Ask him to show
you a list of clients and check back with them to find out
his quality of work and his reliability.
Along with him, make a list of all the materials required,
and check the quality of materials he will use later on. How
to get the best from your contractor ? Keep machinery details
and your layout plan ready before estimation to ensure that
your estimate and the final billing do not vary by a wide
margin. Ensure timely payments as agreed upon for timely completion
of your work.
Test For The Insulation Value...
are a mode of transmission of power from the source to the
point of distribution or load. There are different types of
cables like PVC sheathed, XLPE, rubber insulated, etc. Note
the following points while selecting cables:
Voltage class you require.
Current required by the load.
Material of the conductor, i.e aluminium or copper.
Application Eg: for a chemical industry flame proof
cables (FRL's) need to be used.
Since there are many spurious cables available in the
market, always buy cables with the ISI mark.
Test for the insulation value (Megger test) and core
continuity before buying the cable.
Check the number of cores required.
Buy Gensets Only From An Authorised Dealer
you buy any type of portable genset, the most important qualities
you should look for are fuel efficiency and durability.
Buy a genset according to the total output you require -
length of time and amount of power. For instance: to run two
60 watt bulbs, two tubelights (45 watts each), two fans (60
watts each), one TV (60 watts) and one VCR (40 watts), you
would need a 650 watts generator. On the other hand if you
need to run three fans (180 watts), two bulbs (120 watts),
one refrigerator (270 watts), two PCs and a printer (270 watts),
and a cooler (360 watts), you would need a 2000 watt generator.
Buy only from an authorised dealer and always demand a bill.
See that the dealer gives you prompt after sales service.