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| h | specific enthalpy |
| hfg | latent heat of vapourisation of water = 2450kJ/kg |
| J, kJ | Joule, kilojoule |
| K | degree Kelvin |
| L,L/s | litre, litre per second |
| °C | degree Celsius |
| Pa, kPa | Pascal, kilopascal |
| q | room load or unit capacity, W |
| ql | room latent load or unit latent capacity, W |
| qs | room sensible load or unit sensible capacity,W |
| qtot | room total load or unit total capacity, W |
| QPA | primary air quantity, L/s |
| QSA | supply air quantity, L/s |
| QSCA | secondary air quantity, L/s |
| QSCHW | secondary chilled water quantity, L/s |
| rh | relative humidity, % |
| RA | room air |
| PA | primary air |
| SCA | secondary coil air |
| SA | supply air |
| SCHW | secondary chilled water(F=flow; R=return) |
| tPA | primary air temperature,°C |
| tRA | average room temperature, °C |
| tSA | average supply air temperature, °C |
| tSCHW | secondary chilled water temperature, °C |
| w | moisture content/ specific humidity, g/kg |
| W, kW | Watt, kilowatt |