Heating, cooling and air: sensible/latent loads, COP, EER, airflow, humidity and refrigeration tons
Heat needed to change air or water temperature without a phase change.
Heat absorbed or released when moisture condenses or evaporates — the hidden load air conditioners fight.
Cooling delivered per unit of work input — higher is more efficient.
Cooling capacity in BTU/h per watt of power — a common AC rating.
Cooling capacity in tons, where one ton removes 12,000 BTU/h.
Air volume flow needed to carry a sensible heat load (imperial units).
Maximum possible cooling efficiency between two temperatures (in kelvin).
Ideal efficiency of a heat pump running in heating mode.
Mass of water vapour per unit mass of dry air.
Vapour pressure as a percentage of the saturation pressure.
Power a fan needs to move air against a pressure drop.
Fraction of the cooling load that is sensible rather than latent.
Insulating power of a material layer of given thickness.
Effective average temperature gap driving heat across an exchanger.
Speed of air in a duct from flow rate and cross-section.
Cooling output over a season divided by electrical energy used.
Cumulative measure of how much and how long outdoor temperature sits below a base.