Understanding BTU Calculators
Posted: Wednesday, March 03, 2010
by Sam Brown
Clayton Horsnell LTD
BTU calculators can be found on almost every website with even the most tenuous connection to heating, but what exactly do they do and how is it useful in real terms? Let's take a closer look at the term BTU.
In simple terms, BTU is the accepted abbreviation for British Thermal Unit ; despite the name the BTU is a standard unit of energy all over the world, not just in Britain.
BTU would be more correctly referred to as BTU per hour, but for convenience's sake the term has come to be understood to mean BTU/hr.
The relationship between BTU and the other measurements of energy
1 BTU = 251.9 calories
1 BTU = 1055 joules
1 Watt = 3.413 BTU
1kWatt = 3413 BTU
Electrical heating equipment is by no means the sole generator of BTU. Even human bodies generate a not-inconsiderable amount of BTU. This amount of BTU varies depending on the activity the person is engaged in:
State of Activity BTU/hr generated Asleep 250 At rest 350 Office work (seated) 420 Office work (standing) 640 Ten-Pin Bowling 960 Walking (3mph) 1040 Factory work (heavy) 1600 Exercise (heavy) 1800 As far as we're concerned though, a BTU calculator works by taking some or all of the following measurements and factors into consideration and then using them to calculate the BTU total your heating systems will need to put out:
Length of the Room
Width of the Room
Height of the Room
Dining Room/Lounge
Bedroom
Kitchen/Common Area
North Facing Wall
French Windows
Double Glazing
Divide the resulting BTU total by the number of radiators you intend to install. Your BTU calculator will give the amount of BTU each radiator will need to output.
However it is important to remember that the figure your BTU calculator provides is what the radiator will put out in an average room with no external factors. If you live in a warm climate, on top of an hill completely exposed to the elements or in a region where snow is common, you will have to compensate for these factors.
Remember, it is always better to overestimate your needs than underestimate. You can lower a radiator's maximum heat output but you can't force it to generate more heat than it's physically capable of!
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