HVAC Cooling Load (Sum of Components)

Total sensible + latent cooling load - sum of solar gain, transmission, infiltration, occupants, lighting, equipment, fresh-air make-up.

HVAC

Solar gainkWTransmission through walls/deckheadkWInfiltrationkWOccupants (# × 110 W + latent)kWEquipment + lightingkWFresh air make-up loadkWSafety margin%

Raw load: 30.50kW

Sized load (with margin): 33.55kW

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

Q_\text{total} = \left(\sum Q_i \right) \cdot (1 + M)

Symbol	Meaning	Unit
$Q_\text{solar}$	Solar gain via glazing	kW
$Q_\text{trans}$	Wall / deckhead conduction	kW
$Q_\text{infil}$	Air leakage	kW
$Q_\text{occ}$	Occupant sensible + latent	kW
$M$	Margin factor

Source: ASHRAE Handbook - Fundamentals Ch.18

In short

Total sensible + latent cooling load - sum of solar gain, transmission, infiltration, occupants, lighting, equipment, fresh-air make-up.

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