the pressure drop and power consumption of condenser and evaporator fans

[buresummer]

I am doing a project about the energy consumption of refrigerators but I have no idea about how to estimate the power required by the condenser and evaporator fans. It seems the equation can be W=PV/Efficiency. P is the pressure drop and V is the air flow rate. The question is that how to calculate the pressure drop?

[monkey spanners]

Could you put a watt meter on a motor and measure its consumption? In your air flow modeling, are you allowing for dirt accumilation on the fins over time? very few coils remain clean over time.

[Aik]

You may meassure air volume flow and then look fans performance attributes and calculate energy consumption. For example, in many condencers and air evaporators used Ziehl-abegg or EBMpapst fans.