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8 results for “cooling”

Formulae (8)

PUE = \frac{\text{Total facility energy}}{\text{IT equipment energy}}

How efficiently a data centre uses energy, versus overhead like cooling.

COP = \frac{Q_c}{W}

Cooling delivered per unit of work input — higher is more efficient.

EER = \frac{BTU/h}{W}

Cooling capacity in BTU/h per watt of power — a common AC rating.

TR = \frac{Q}{12000}

Cooling capacity in tons, where one ton removes 12,000 BTU/h.

COP = \frac{T_c}{T_h - T_c}

Maximum possible cooling efficiency between two temperatures (in kelvin).

SHR = \frac{Q_s}{Q_{total}}

Fraction of the cooling load that is sensible rather than latent.

SEER = \frac{\text{annual BTU}}{\text{annual Wh}}

Cooling output over a season divided by electrical energy used.

T(t) = T_s + (T_0 - T_s)\, e^{-kt}

The rate at which an object cools is proportional to the temperature difference between the object and its surroundings.