For evaporators below 0°C, Thermexcel includes a frost growth model (empirical) but does not simulate cyclic defrost. Users must manually iterate with frost thickness limits.
In spaces below 0°C, psychrosi leads to frost formation. ThermExcel can be modified (using low-temperature psychrometric functions) to estimate defrost cycles based on moisture removal rates. thermexcel programme psychrosi
Let’s run the numbers:
Observations:
This is a classic psychrosi outcome—cold, clammy air leaving the coil, ready to be reheated if necessary. For evaporators below 0°C, Thermexcel includes a frost
ThermExcel automates these calculations, allowing you to input entering air conditions and coil surface temperature to instantly compute the leaving air state. Observations:
CETIAT has validated Thermexcel against experimental data for dehumidifying coils within ±5% for capacity and ±10% for outlet RH, provided: