refrigeration evaporator performance 1

[buster]

My work involves an environmental test chamber (hot, cold & humidity, the issue I have is during cold tests (-20°F or so) the evaporators frost up from traffic into and out of the chamber (reducing performance of the refrigeration system). Looking for information on evaporator de-rating as ice is accumulated and sucessful stratigies to combat or reduce ice formation on evaporators. [sig][/sig]