Lab-8 EER

Question:

I have a question for calculating the consumed electricity (Ele) in Q2 in Lab 8. The instructions have the formula:
     EER = Ecooling * Electricity     (1.1)
rearranging to:
     Electricity = EER / Ecooling    (1.2)
However, the text in the instructions says, "The efficiency of chiller can be rated by the Energy Efficiency Ratio (EER) which is defined as the cooling output in Btu divided by the total electric energy input in watt-hours during the same period..." which would lead to this formula:
    EER = Ecooling / Electricty    (2.1)
rearranging to:
    Electricity = Ecooling / EER    (2.2)
Since EER has no units, I was unable to determine the correct way of calculating the electricity.  I'm assuming it would be like 2.2, but I would like to make sure which formula to use.

Response:

• EER is defined in the instructions as Ecooling / Eelectricity – which is your 2.1
• EER is NOT a dimensionless number – the units weren’t written next to the definition but are given in the instructions.