Air, surface and dew point temperature under high humidity conditions during commercial cold storage of apples

Humidity and temperature were recorded in a 50-ton commercial apple cold room. Measurements were taken inside multiple storage bins. Ventilation runtime and temperature setpoint of the cooling system were varied during four tests. The dew point can be calculated from air humidity and temperature, measured close to the fruit. A comparison of dew point and fruit surface temperature indicates whether moisture condensation on the fruit surface is likely. Controlled atmosphere conditions were applied during two tests. The tests were carried out during the winter season of 2024/25 near Ravensburg, Germany.在一座额定装载量50吨的商用苹果冷藏库内，采集并记录了库内环境的温湿度数据。测量工作在多个储藏货箱内部开展。在四项测试过程中，对通风系统运行时长与制冷系统的温度设定值进行了调整。在贴近果实的位置测得空气温湿度后，可据此计算露点温度；通过比对露点温度与果实表面温度，可判断果实表面是否存在结露风险。其中两项测试采用了气调（controlled atmosphere）贮藏工况。所有测试均于2024/2025年冬季在德国拉芬斯堡（Ravensburg）周边开展。