10. Evaporator defrosting
When the cold room temperature is close to or below 0°C, the evaporator is covered with frost, which progressively reduces the heat transfer coefficient, impairs the system's energy performance and, secondarily, reduces the air flow rate. The evaporator must be defrosted, i.e. heated above 0°C to melt the frost.
10.1 Defrosting efficiency
Defrosting is an operation that disrupts storage conditions and is energy-intensive. It can be broken down into four phases:
first phase: supply of heat quantities Q1 to heat up the frost, Q2 to heat up the coil and Q3 to heat up the mass of refrigerant contained in the coil, or liquid refrigerant if not previously drained, from storage temperature T to 0 °C ;
second phase:...
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Evaporator defrosting
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