This HVAC calculator is designed to
give an approximate size for an adequate room air conditioner unit
capable of cooling the room you have described in your entry. More
information can be found below the HVAC calculator.
Inside an air conditioner, air is taken in through the air
intake and becomes filtered. The air then passes over a series
of cooling pipes. Inside the pipes circulates some type of cold
fluid that is usually between 4 and 10 °C. If the temperature
needs to be below 0 °C, like in a freezer, cold brine is
used. The air that passes over the pipes becomes cooler and
less humid. A fan inside the unit then pushes the air into the
The size of an air conditioner required for a given job is
determined by calculating the cooling load, which is the amount
of cooling that the machine will have to put out to "condition"the
space. The cooling load depends upon the size and `shape of
the space; the number and size of windows and their orientation
toward the sun; the areas of walls, ceilings, floors and the
extent to which they are insulated; local climatic conditions;
the wattage of electrical equipment present; and the number
of people who normally occupy the space.
The BTU per hour rating is the basic measurement in the United
States for air conditioning, and it is used to specify the capacity
of an air conditioner. One British thermal unit (BTU) equals
the amount of heat needed to raise the temperature of 1 pound
of water from 59 °F to 60 °F (15 °C to 16 °C).
An air conditioner with a capacity of 12,000 BTU per hour can
remove enough heat from the air it is conditioning to raise
12,000 pounds (5,440 kilograms) of water one degree Fahrenheit
each hour. One BTU per hour is equal to 0293 watts. The cooling
capacities of room air conditioners range from 1 to 10 kilowatts.
Ka Fung Kan -- 2001