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Measured in square feet, the reference standard for EDR is the mattress radiator [1] invented by Stephen J. Gold in the mid 19th century. One square foot of EDR is able to liberate 240 BTU per hour when surrounded by 70 °F (21 °C) air and filled with steam of approximately 215 °F (102 °C) temperature and 1 psi of pressure.
The SI unit of power for heating and cooling systems is the watt. Btu per hour (Btu/h) is sometimes used in North America and the United Kingdom - the latter for air conditioning mainly, though "Btu/h" is sometimes abbreviated to just "Btu". [18] MBH—thousands of Btu per hour—is also common. [19] 1 W is approximately 3.412142 Btu/h [20]
The first of the cooling load factors used in this method is the CLTD, or the Cooling Load Temperature Difference. This factor is used to represent the temperature difference between indoor and outdoor air with the inclusion of the heating effects of solar radiation. [1] [5] The second factor is the CLF, or the cooling load factor.
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As a general rule of thumb, choose a unit that delivers 20 BTUs per square foot of living space. So, a 200-square-foot room needs at least a 4,000-BTU air conditioner. Those sensitive to noise ...
On average, an air conditioning unit needs about 20 BTUs per square foot of space to keep things cool, said McKeon. ... From 250 up to 350 square feet: 7,000 to 8,000 BTUs. From 350 up to 450 ...
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