HVAC & Refrigeration
Intermediate

Sensible Heat Ratio

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

Formula

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

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Variables

SHRSensible heat ratio
Q_sSensible load
Q_{total}Total load

Example

Q_s=8, Q_total=10 kW: SHR = 0.8

Did You Know?

A low SHR signals a humid space where the system must dehumidify heavily.

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Sensible Heat Load

Basic

Heat needed to change air or water temperature without a phase change.

Latent Heat Load

Intermediate

Heat absorbed or released when moisture condenses or evaporates — the hidden load air conditioners fight.

Coefficient of Performance (Cooling)

Intermediate

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

Energy Efficiency Ratio (EER)

Basic

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

Refrigeration Tons

Basic

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

Airflow (Sensible)

Intermediate

Air volume flow needed to carry a sensible heat load (imperial units).