Kw Btu Hr Conversion

RTU Ton to KW multiplication factor

Converting a heat quantity into equivalent electrical unit is wrong. We need to know how efficient your "heat pump" is that's why we need to know the EER. For a 15-ton cooling, we will be "pumping" that amount of "heat" in the refrigerant medium out of the controlled space and throw those heat outside. The "real world conversion" will then be the machine electrical input requirement ratio to the amount of heat the machine pumps out, in terms of BTU handled per watts input, simply called EER. I sometimes use methods similar to kingpb's. Other times I look for a bit of detail first: does the unit have electrical heat? Next I approximate the square footage of the area and multiply by 1 - 1.5 cfm depending on the location of the project. 1 ton (approximately)= 400 cfm, so I divide the cfms by 400 and select a tonnage. Then jump on carrier or trane and check out some units that fit the tonnage. I've found both methods to work decently well. At the end I sometimes add a 10-15% contingency to the load just in case. But bottom line is trying to approximate the unit is a crude approach and the methods suggested here don't give you an exact conversion, rather a real conservative approach that aims only not to undersize the electrical source.

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