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Sizing - Part I - Air Conditioner Sizing

We hear a lot about air conditioner exercise?the occupants. It takes a lot to
sizing, whenever we make the important cool a town hall full of people, doesn't
choice of purchasing, or installing one. it? Oh yes, we generate heat.Square feet
What does the word sizing really mean?Air method?You might have heard about the
conditioners are designed for heat square feet method in air conditioner
removal, or addition (if heat pump is sizing. In fact, it is used often by many
included in the single package). contractors, that we sometimes use it
Therefore, the "size" of an AC, will be arbitrarily. This method have been
specified in terms of heat removal, or generalised, and simplified by
addition capability.Units that we use contractors, from sizing many ACs.The
for air conditioner sizing, are BTU/hr most common relationship is, "1 ton for
(British Thermal Units per hour), Ton, every 500 square feet of floor area".
and Watts. Some countries utilise one This method might work for a contractor,
unit, more than the others, in air working in a small area, with similar
conditioner sizing.It is excellent if you type of houses or buildings,
can remember the relationship between BTU and similar wall material.But, the
hr, Ton, and Watts. You can quickly gauge relationship will not work, if you change
the AC size, in case if your friends use the wall construction type, or if you
units - that are unfamiliar to you;1 ton move into a different area, with
is equivalent to 12,000 BTU/hr. different climate. Simply said, this
And,12,000 BTU/hr is equivalent to 3,516 method of air conditioner sizing will
Watts - or 3.516 kW (kilo-Watts).Concept only work for a confined group of
and fundamental of air conditioner building, in a given area.However, this
sizingIt is based on heat gain, and/or is method is reasonably useful for
losses in a building. It is obvious that installing window, small split, or
you will need to remove the amount of portable air conditioners.Manual JNow,
heat gain into your house - if it is hot this is the way we should do air
outside. Similarly, you'll need to add in conditioner sizing. Manual J is a
the heat loss from your house - if database, with methodologies, formulas
outside temperature is cold.In short, and guide for sizing and AC. This manual
heat gain and loss, must be equally has been developed by ACCA (Air
balanced by heat removal, and addition, Conditioning Contractors of America) -
to get the desired room comfort that we with regular reviews.It will provide you
want.What determines the amount of heat with necessary data for heat gain and
removal and/or addition that we want?It heat loss calculations. Wall
is determined by,the temperature construction, building orientation,
difference between outside temperature, infiltration, shading, number of
and our desired temperature. It is common occupants, the temperature you would like
sense that if you want a cool room, in a to set, outside temperatures, are among
very hot climate, you'll need to remove a the most important values it will look
lot of heat. On the other hand, it does for, for proper air conditioner
not take much to maintain a cool room, on sizing.This is indeed, an extensive
a mild daythe construction material, and manual, which is used by certified and
arrangement of your building. Let's say, experienced air conditioning
that you have two identical houses. One contractors.Manual J is just a tool. The
is build out of glass, and the other out important things are, the values that are
of brick, and well insulated.Of course put in it. If we put in accurate values,
the one built with glass would require then our results will be come accurate.
much more heat addition, or removal, Otherwise, it's not going to help
compared to the other - given a same much.What are amongst the important
day.Two identical house, with different information, you should have for air
orientation with respect to the direction conditioner sizing using Manual J? These
of sun rise and fall, will also influence are,required temperature range within
the air conditioner sizingthe surface your space,approximate temperature
area of the walls. The larger the surface distribution within your area, to find
area - the more heat that can loose, or out the number of months you have winter,
gain through it. Hence, effects the AC summer, and mild weathers,wall surface
size that you would needinfiltration area and material. Window surface
plays a part in determining our air area,any tinted window? Any insulated
conditioner sizing. Door gaps, cracked space?how many person is going to live
windows, chimneys - are the "doorways" within each space?what are the activities
for air to enter from outside, into your carried out throughout any day? How much
living space. Only you know how cooking? How much of hot water
frustrating it can get, to feel a draft utilisation?orientation of your building,
of chill, or hot air from with respect to the sun's rise and fall
outsideactivities and other equipment direction, and,sources of
within a building. Cooking? Hot bath? Is infiltrationPart II or air conditioner
it a gymnasium with a lot of intense sizing is coming soon...




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