Dantherm Selection Guide 4/4 - Where and why is dehumidification needed?
Download as PPTX, PDF0 likes293 views
This document discusses where and why dehumidification is needed. It explains that dehumidification is often required to preserve goods and materials in storage rooms and warehouses by keeping relative humidity (RH) below a certain level. Proper insulation and air changes are important factors to control humidity. Dehumidification is also necessary to protect equipment and structures at water works from condensation that occurs when the dew point is higher than surface temperatures of pipes and other metal surfaces. High humidity can cause corrosion, mold growth, and other issues. The document provides a table showing maximum recommended RH levels at different temperatures to avoid condensation when water is at 7°C.
Dantherm Selection Guide 4/4 - Where and why is dehumidification needed?
- 1. © Dantherm A/S Dehumidification – Selection Guide Part 4/4 – Where and why is dehumidification needed?
- 2. © Dantherm A/S Preserve and protect goods and materials 2 Humidity problems concerning preservation and protection of goods and materials is typically a question of ensuring that the RH-value never exceeds a predetermined level. Usually the locale is a storage room or a warehouse. The quality of storage facilities varies considerable. Often they are either very well sealed off from the outside air or poorly insulated. In both cases the air change is an important quantity.
- 3. © Dantherm A/S In the table below, you will see the difference in air change in various locales depending on the quality of the insulation. However, the air change is not the only parameter to take into account. Again you must consider the humidity contribution from people, outside air, goods and possible processes inside the storage room. Air change 3
- 4. © Dantherm A/S Humidity conditions at a water work can be quite extreme. Here dehumidification is a question of protection and preservation of the water pipes, pumps and other equipment as well as the building itself. In most cases the water temperature is 6-9°C. This means that the surface temperature of the pipes is roughly the same. To avoid condensation the dew point temperature has to be lower than the surface temperature of the pipes. Water works 4
- 5. © Dantherm A/S If the relative humidity is too high you will get a large amount of condensation on all metal surfaces. Paint will peel off the water pipes and serious attacks of corrosion will set in The humid environment also accelerates the growth of fungus and mold. Mosquitos thrive in the humid atmosphere and deposit their eggs in the open reservoir making it altogether very difficult to meet the hygienic requirements. High relative humidity 5
- 6. © Dantherm A/S The table below shows the max. RH-value if the water temperature is 7°C at different room temperatures to avoid condensation. Max. RH-value if the water temperature is 7°C 6
- 7. © Dantherm A/S If you would like to read more from our Selection Guide click here. If you would like to read one of our case stories about drying out water damage click here. Further information 7
- 8. © Dantherm A/S 8 THANK YOU FOR YOUR ATTENTION! Visit our webpage www.dantherm.com