Temperature & Humidity in Ocean Containers

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The shipment with the highest relative humidity occurred during a trip from Japan to Portland. The relative humidity was recorded at 96% on August 5, 2005 while the container was on land. Figure 9 shows the detailed temperature and humidity profile. The most extreme humidity conditions are seen during periods of large daily temperature changes. In this example, as the temperature slowly drops from 88° F [31° C] to 67° F [19° C] over 9 days, the humidity increases to 88% before returning to 79%. However, starting on August 4 as the temperature dropped from 121° F [49° C] to 68° F [20° C] over a 16 hour period, the relative humidity rose from 32% to 96%. The corrugated boxes seem to absorb moisture fast enough to temper humidity during slow changes in temperature while at sea. However, rapid temperature changes seen on land seem to exceed the rate at which the corrugated boxes can absorb moisture. Temperature F and Relative Humidity % 140 120 100 80 60 40 Figure 9: Highest Relative Humidity 96% Japan to Portland Temperature Relative Humidity 20 -7 11-Jul-05 16-Jul-05 21-Jul-05 26-Jul-05 31-Jul-05 05-Aug-05 Date Ocean Container Temperature and Humidity Study Dave Leinberger – Dimensions.06 58 53 48 43 38 33 28 23 18 13 8 3 -2 Temperature C
Effect of Position on Ship: As part of our study, we measured the conditions in multiple ocean containers traveling on the same voyage. The temperature profiles were usually very close to identical. However, on a few shipments, there were clear differences in temperature between the different ocean containers. The largest difference was recorded between two containers traveling from Japan to The Netherlands. Figure 10 shows how container #2 had a gradual temperature variation along the ocean voyage. Container #1 shows a much larger variation each day. This container may have been loaded above deck where the sunlight could affect the container temperature. It is important to note that the temperature variations while at sea are more moderate than those seen before and after the ocean voyage. Temperature F 110 100 90 80 70 60 50 40 Figure 10: Container Temperature Differences From Same Ship Container 1 Container 2 30 -1 02-Sep-04 12-Sep-04 22-Sep-04 02-Oct-04 12-Oct-04 Date Ocean Container Temperature and Humidity Study Dave Leinberger – Dimensions.06 39 34 29 24 19 14 9 4 Temperature C
Page 1 and 2: Temperature & Humidity in Ocean Con
Page 3 and 4: Seasons Date recording began in Apr
Page 5 and 6: The second stage is the actual time
Page 7: Extreme Conditions: Some of the mos
Page 11: Effect of Container Contents: In ou

Temperature & Humidity in Ocean Containers

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