06-27-2022, 12:17 AM
There is no tent without dew. The principle of condensation is that the temperature in the tent is higher, the temperature of the tent wall is lower, and the water vapor in the tent condenses on the tent wall. The human body at night by the respiratory system and perspiration moisture in 200-500ml. (not many!) If there is a lot of perspiration water, if the temperature is very low and the temperature in the sleeping bag insulation layer drops below the dew point, the water will accumulate in the sleeping bag insulation layer. This is one of the most important issues to consider when camping for a long time in winter. Simply put, in a cold environment, whether it is single-layer or with internal and external curtains, if the design of the ventilation hood is not good, this problem can not be avoided. Why? First, understand where the water comes from. In terms of sleep, one is the water vapor evaporated from the body, and the other is the water vapor exhaled from the mouth. The words "Qi" and "steam" are very different. Water vapor can be breathed out from the coated fabric with an air permeability function. In the beginning, water vapor is breathed out of the mouth. Due to a large amount of exhalation, water vapor changes when the mouth is cold. The white one is already a tiny water drop, which is larger than the micropore of the breathable coated fabric, and rarely can be breathed out.
There are many ways to avoid it:
1. Keep ventilated. Depending on the design of the tent, each has its own advantages. Especially for the single-layer bottom (the floor and the tent are sewn together), the top must be well ventilated, or condensate will flow down
2. Choose a double-layer tent with a breathable inner curtain at the bottom of the bag. Condensate will flow down the outer curtain. Here, we must pay attention to the air permeability of the inner curtain. If the air permeability is not good, it is very dangerous, but the condensate is good. In a cold environment, if the condensate continues to frost on the inner curtain, resulting in a completely airtight closed inner curtain, it will be stuffy.
3. As for the large tent, it can make a fire without making a fire. Under the condition that there will be no water vapor, the breathable fabric tent (cotton tent without weight requirements, which is breathable and moisture permeable) should be selected, and the one with good water splashing resistance should be selected, which will reduce the permeability after the waterproof fabric is wet.
There are many ways to avoid it:
1. Keep ventilated. Depending on the design of the tent, each has its own advantages. Especially for the single-layer bottom (the floor and the tent are sewn together), the top must be well ventilated, or condensate will flow down
2. Choose a double-layer tent with a breathable inner curtain at the bottom of the bag. Condensate will flow down the outer curtain. Here, we must pay attention to the air permeability of the inner curtain. If the air permeability is not good, it is very dangerous, but the condensate is good. In a cold environment, if the condensate continues to frost on the inner curtain, resulting in a completely airtight closed inner curtain, it will be stuffy.
3. As for the large tent, it can make a fire without making a fire. Under the condition that there will be no water vapor, the breathable fabric tent (cotton tent without weight requirements, which is breathable and moisture permeable) should be selected, and the one with good water splashing resistance should be selected, which will reduce the permeability after the waterproof fabric is wet.