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Radiant Cooling Dew Point & Relative Humidity Charts

Why is this important?

To operate a radiant cooling system without producing condensation water on the surfaces, the system loop operating temperature at the radiant surface (or of any uninsulated piping) should be at least 1 °F above the dew point. Below shows the dew point at various indoor conditions of RH and temperature. For customers in dry or moderate climates, the loops can be quite cold (generally under 60° F) which can deliver up to 14 BTU per ft^2 according to the type of radiant design, panels, floor coverings, etc. The XCRC1 controller makes sure that the loop temperature does not drop below the user-defined delta to the dew point. In some climates, a dehumidifier may need to come on a few days each year to deal with excess humidity for added comfort and to suppress the dew point to allow colder water in the loop. ASHRAE guidelines suggest indoor humidity to be </=60% RH. Please contact the Chiltrix engineering department with any questions.
T RH DP Days to Mold EMC
80°F 55% 62°F No Risk 9.90%
80°F 54% 62°F No Risk 9.70%
80°F 55% 62°F No Risk 9.90%
80°F 53% 61°F No Risk 9.50%
80°F 52% 61°F No Risk 9.40%
80°F 51% 60°F No Risk 9.20%
80°F 50% 60°F No Risk 9.10%
80°F 49% 59°F No Risk 8.90%
80°F 48% 58°F No Risk 8.80%
80°F 47% 58°F No Risk 8.60%
80°F 46% 57°F No Risk 8.50%
80°F 45% 57°F No Risk 8.30%
80°F 44% 56°F No Risk 8.20%
80°F 43% 55°F No Risk 8%
80°F 42% 55°F No Risk 7.90%
80°F 41% 54°F No Risk 7.70%
80°F 40% 53°F No Risk 7.60%
80°F 39% 53°F No Risk 7.40%
80°F 38% 52°F No Risk 7.30%
80°F 37% 51°F No Risk 7.10%
80°F 36% 50°F No Risk 7%
Temp °F RH % Dew Point Days to Mold EMC
78°F 55% 61°F No Risk 9.90%
78°F 55% 61°F No Risk 9.90%
78°F 54% 60°F No Risk 9.70%
78°F 53% 60°F No Risk 9.60%
78°F 52% 59°F No Risk 9.40%
78°F 51% 58°F No Risk 9.30%
78°F 50% 58°F No Risk 9.10%
78°F 49% 57°F No Risk 8.90%
78°F 48% 57°F No Risk 8.80%
78°F 47% 56°F No Risk 8.60%
78°F 46% 56°F No Risk 8.50%
78°F 45% 55°F No Risk 8.30%
78°F 44% 54°F No Risk 8.20%
78°F 43% 54°F No Risk 8%
78°F 42% 53°F No Risk 7.90%
78°F 41% 52°F No Risk 7.70%
78°F 40% 52°F No Risk 7.60%
78°F 39% 51°F No Risk 7.40%
78°F 38% 50°F No Risk 7.30%
78°F 37% 50°F No Risk 7.10%
78°F 36% 49°F No Risk 7%
   
Temp °F RH % Dew Point Days to Mold EMC
76°F 55% 59°F No Risk 9.90%
76°F 55% 59°F No Risk 9.90%
76°F 54% 58°F No Risk 9.80%
76°F 53% 58°F No Risk 9.60%
76°F 52% 57°F No Risk 9.50%
76°F 51% 57°F No Risk 9.30%
76°F 50% 56°F No Risk 9.10%
76°F 49% 56°F No Risk 9%
76°F 48% 55°F No Risk 8.80%
76°F 47% 55°F No Risk 8.70%
76°F 46% 54°F No Risk 8.50%
76°F 45% 53°F No Risk 8.40%
76°F 44% 53°F No Risk 8.20%
76°F 43% 52°F No Risk 8.10%
76°F 42% 51°F No Risk 7.90%
76°F 41% 51°F No Risk 7.80%
76°F 40% 50°F No Risk 7.60%
76°F 39% 49°F No Risk 7.50%
76°F 38% 49°F No Risk 7.30%
76°F 37% 48°F No Risk 7.20%
76°F 36% 47°F No Risk 7%
76°F 35% 47°F No Risk 6.90%
Temp °F RH % Dew Point Days to Mold EMC
74°F 55% 57°F No Risk 10%
74°F 55% 57°F No Risk 10%
74°F 54% 56°F No Risk 9.80%
74°F 53% 56°F No Risk 9.70%
74°F 52% 55°F No Risk 9.50%
74°F 51% 55°F No Risk 9.40%
74°F 50% 54°F No Risk 9.20%
74°F 49% 54°F No Risk 9%
74°F 48% 53°F No Risk 8.90%
74°F 47% 52°F No Risk 8.70%
74°F 46% 52°F No Risk 8.60%
74°F 45% 51°F No Risk 8.40%
74°F 44% 51°F No Risk 8.30%
74°F 43% 50°F No Risk 8.10%
74°F 42% 49°F No Risk 8%
74°F 41% 49°F No Risk 7.80%
74°F 40% 48°F No Risk 7.70%
74°F 39% 47°F No Risk 7.50%
74°F 38% 47°F No Risk 7.40%
74°F 37% 46°F No Risk 7.20%
74°F 36% 45°F No Risk 7.10%
74°F 35% 45°F No Risk 6.90%

 
Temp °F RH % Dew Point Days to Mold EMC
72°F 55% 55°F No Risk 10%
72°F 55% 55°F No Risk 10%
72°F 54% 55°F No Risk 9.90%
72°F 53% 54°F No Risk 9.70%
72°F 52% 54°F No Risk 9.50%
72°F 51% 53°F No Risk 9.40%
72°F 50% 52°F No Risk 9.20%
72°F 49% 52°F No Risk 9.10%
72°F 48% 51°F No Risk 8.90%
72°F 47% 51°F No Risk 8.70%
72°F 46% 50°F No Risk 8.60%
72°F 45% 50°F No Risk 8.40%
72°F 44% 49°F No Risk 8.30%
72°F 43% 48°F No Risk 8.10%
72°F 42% 48°F No Risk 8%
72°F 41% 47°F No Risk 7.80%
72°F 40% 46°F No Risk 7.70%
72°F 39% 46°F No Risk 7.50%
72°F 38% 45°F No Risk 7.40%
72°F 37% 44°F No Risk 7.20%
72°F 36% 44°F No Risk 7.10%
72°F 35% 43°F No Risk 6.90%
Temp °F RH % Dew Point Days to Mold EMC
70°F 55% 53°F No Risk 10.10%
70°F 55% 53°F No Risk 10.10%
70°F 54% 52°F No Risk 9.90%
70°F 53% 52°F No Risk 9.70%
70°F 52% 51°F No Risk 9.60%
70°F 51% 51°F No Risk 9.40%
70°F 50% 50°F No Risk 9.20%
70°F 49% 50°F No Risk 9.10%
70°F 48% 49°F No Risk 8.90%
70°F 47% 49°F No Risk 8.80%
70°F 46% 48°F No Risk 8.60%
70°F 45% 47°F No Risk 8.50%
70°F 44% 47°F No Risk 8.30%
70°F 43% 46°F No Risk 8.20%
70°F 42% 46°F No Risk 8%
70°F 41% 45°F No Risk 7.90%
70°F 40% 44°F No Risk 7.70%
70°F 39% 44°F No Risk 7.60%
70°F 38% 43°F No Risk 7.40%
70°F 37% 42°F No Risk 7.20%
70°F 36% 42°F No Risk 7.10%
70°F 35% 41°F No Risk 6.90%
   

 

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Hydronic Air Handler Options For Use With Chiltrix Air To Water Heat Pumps, Chillers, Boilers, Etc.

 

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