This study aims to assess how both fresh air exchange and humidity control affect average relativehumidity, power uptake, and supply air temperature in reefer containers.Tests were done in a warm and humid climate chamber on two new empty 40 ft HC reefer containerwith two different popular refrigeration unit types. Tests were done at multiple combinations ofcontainer temperature setpoint (-3.5 or 20 °C), relative humidity setpoint (60 % or off) and fresh airexchange setting (0, 125, or 250 m3/h).The most important conclusions are:1. Dehumidification increases the units’ power uptake from approx. 2 to 8 kW, while fully openingthe fresh air exchange adds at most 1.3 kW.2. A humidity setpoint of 60 % is mostly infeasible, only one unit with closed vent reaches thesetpoint.3. For one of the two units the effect of fresh air exchange on relative humidity is negligible.
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