A cooling coil should have the capacity to handle the heat load generated in the room in addition the capacity to cool down the fresh make up air. The Great Sensible Factor is independent of the total air flow and can be expressed as
GSHF = [Qs + mf cp (tf - tr)] / [Qt + mf (hf - hr)] (1)
GSHF = Great Sensible Heat Factor
Qs = sensible heat generated in the room (kW)
mf = fresh air mass flow (make up air) (kg/s)
cp = specific heat of air (kg/kg.oC)
tf = temperature in fresh air (oC)
tr = temperature in room air (oC)
Qt = total heat generated in the room (kW)
hf = specific enthalpy of fresh air (kJ/kgoC)
hr = specific enthalpy of air in the room (kJ/kgoC)
Example - Great Sensible Heat Factor - GSHF
The fresh (out door) air temperature is 28oC with a specific enthalpy of 60 kJ/kg and a humidity ratio of 12.7 g/kg.
The room temperature is 22oC with a specific enthalpy of 45 kJ/kg and a specific humidity of 9.1 g/kg.
The Great Sensible Heat Factor can be calculated like
GSHF = [(4000 W) + (1000 kg/h)(1/3600 s/h)(1000 J/kgoC)(28oC - 22oC)] / [(4000 W + 1400 W) + (1000 kg/h)(1/3600 s/h)(60000 J/kg - 45000 J/kg)]
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
The mass of water vapor present in moist air - to the mass of dry air.
Latent and sensible cooling and heating equations - imperial units.
Latent and sensible cooling loads to consider when designing HVAC systems.
Enthalpy change and temperature rise when heating humid air without adding moisture.
Latent heat is the heat when supplied to or removed from air results in a change in moisture content - the temperature of the air is not changed.
Human metabolic heat gain in air conditioned rooms.
Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling.
Sensible and latent heat of moist air.
Room Sensible Heat Factor - RSHF - is defined as the sensible heat load divided by the total heat load in a room
Sensible heat is dry heat causing change in temperature but not in moisture content
The ratio Sensible Heat (or Cooling) Load to the Total Heat (or Cooling) Load.
Thermal properties of water at different temperatures like density, freezing temperature, boiling temperature, latent heat of melting, latent heat of evaporation, critical temperature and more.