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# Great Sensible Heat Factor - GSHF

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)

where

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 sensible heat generation in a room is 4 kW and the latent heat generated is 1.4 kW. The room is cooled with an air flow of 1000 kg/h.

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)]

= 0.59

## Related Topics

### • Air Psychrometrics

Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.

## Related Documents

### Air - Humidity Ratio

The mass of water vapor present in moist air - to the mass of dry air.

### Cooling and Heating Equations

Latent and sensible cooling and heating equations - imperial units.

### Cooling Load - Latent and Sensible Heat

Latent and sensible cooling loads to consider when designing HVAC systems.

### Humid Air - Heating

Enthalpy change and temperature rise when heating humid air without adding moisture.

### Latent Heat Flow

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.

### Metabolic Heat Gain from Persons

Human metabolic heat gain in air conditioned rooms.

### Moist Air - Cooling and Dehumidifying

Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling.

### Moist Air - Enthalpy

Sensible and latent heat of moist air.

### Room Sensible Heat Factor - RSHF

Room Sensible Heat Factor - RSHF - is defined as the sensible heat load divided by the total heat load in a room

### Sensible Heat Flow

Sensible heat is dry heat causing change in temperature but not in moisture content

### Sensible Heat Ratio - SHR

The ratio Sensible Heat (or Cooling) Load to the Total Heat (or Cooling) Load.

### Water - Thermophysical Properties

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.

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