How Is The “seer” Calculated For Air Conditioners And Sinilar Equipment?
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SEER or Seasonal energy efficiency ratio is a calculation of how much energy your unit will consume and not just the EER
Air conditioner sizes are often given as “tons” of cooling where 1 ton of cooling is defined as being equivalent to 12,000 BTU/h. The annual cost of electric power consumed by a 72,000 BTU/h (6 ton) air conditioning unit operating for 1000 hours per year with a SEER rating of 10 and a power cost of 12¢ per kilowatt-hour (kW·h) may be calculated as follows:
unit size, BTU/h × hours per year, h × energy cost, $/kW·h ÷ SEER, BTU/W·h ÷ 1000 W/kW this would be a 10 SEER
Example:
(72,000 BTU/h) × (1000 h) × (12¢/kW·h) ÷ (10 BTU/W·h) ÷ (1000 W/kW) = $864 annual cost
As another example, a 2,000 sq ft (190 m2) residential unit near Chicago would require a 4 ton air conditioner based on a location-specific rule-of-thumb that 1 ton is required for each 500 sq ft (46 m2) for a typical older house:
(2,000 sq ft (190 m2)) ÷ (500 sq ft (46 m2)/ton) = 4 tons.
(4 tons) × (12,000 BTU/h/ton) = 48,000 BTU/h.
The estimated cost of electrical power for the 4 ton unit with a SEER rating of 10 and an energy cost of 10¢ per kilowatt-hour, using 120 days of 8 hours/day operation, would be:
(48,000 Btu/h) × (960 h/year) × (10¢/kW·h) ÷ (10 BTU/W·h) ÷ (1000 W/kW) = $461 annual cost
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I know the EER is calculated by dividing the BTU’s by the Watts. So, a 36,000 btu unit using 4,000 watts will have an eer of 9.
This does not factor in the energy cost of start up and shut down, only steady state operation.
That is where the ARI comes in, to rate all of the equipment using a long list of equations which use air flow, air resistance, humidity, and other factors.
This is my answer that I use since I don’t know that exact methods the ARI uses.
The standard equation is s-(e+e)r. The safety ranger is between 185 and 205. Any variance within this range can be dubbed biphonial and will make little difference. There is always the possibility of getting some hot air when dealing with the SEER equation, so be aware.