Parasitic loads—walk-in refrigeration

Energy efficiency is compromised in commercial walk-in refrigerators and freezers by parasitic loads: demands on the refrigeration system from items other than those meant to be cooled. Examples of parasitic loads include interior lighting, fans and pumps, heat gains through insulation, air changes from open doors, and even personnel and machinery operating inside the unit.

Some parasitic loads use energy twice: directly from the electrical system to power fans and pumps, and indirectly through heat gain, which must be removed by the refrigeration system. 

Follow these operating tips to help reduce the effect of parasitic loads.