A jet of air at a temperature of 15 ° C passes into a non-isolated duct through an environment with 32 ° C TBS and 23 ° C TBU. Will there be condensation on your outer face?

 In the psychrometric chart, mark the point referring to the external air temperature and drawing a horizontal line from right to left, check the point at which there is intersection with the saturation line. At this point the dew temperature of the external air is located, ie if the temperature of the air is cooled below this value, there will be condensation of part of its dissolved moisture. In this example the dew temperature is 19.2 ° C and the outside face temperature of the duct is close to 15 ° C, which makes moisture condensation unavoidable. The solution to this problem is usually achieved through adequate duct insulation.