Why is there a resurgence phenomenon?

Reason: In fact, the "moisture regain" of sea breeze is a natural phenomenon, which often occurs in the transition period from winter to spring. The main reasons are indoor and outdoor temperature difference and humid water vapor in spring. After winter, the indoor wall and ground temperature drops day by day, and after spring, the outdoor temperature rises rapidly, but the indoor temperature is still cold, resulting in the temperature difference between indoor and outdoor. On the other hand, after entering the spring, warm and humid air currents from the ocean usually prevail. That is, people often say "southern sky", and the water in the air is extremely rich. At this time, when the outdoor air suddenly rises sharply and is very humid, it will condense into small water droplets on the cold ground and walls, and even form a flowing water layer, which is called "moisture regain" or "moisture regain". Especially hard objects such as tiled floors and walls, painted furniture surfaces, mercury mirrors, aluminum alloy doors and windows are airtight. The phenomenon of moisture regain is more serious. The "resurgence" phenomenon that harmful substances are moldy and prone to rheumatism is manifested in the obvious increase of humidity in the air, which makes food, clothing, furniture and other items moldy. People who live in humid rooms for a long time are prone to rheumatism and other diseases, or make patients with original rheumatism get sick or aggravate their illness. The "resurgence" weather is conducive to the growth and reproduction of bacteria, which greatly increases the chances of people suffering from typhoid fever, dysentery, various digestive system diseases and skin diseases. Other studies have found that people are prone to headaches, ulcers, rashes and other diseases in humid weather. People often feel bored, which will affect people's blood pressure, erythrocyte sedimentation rate, urine output and so on. Some people feel depressed and depressed. Children tend to cry, make noise or shout easily; Women prefer to nag and have a bad temper, while neurotic patients feel irritable, insomnia and even impulsive behavior; The symptoms of people with depression will get worse. Countermeasures: Close the doors and windows, remove moisture and raise the temperature. Knowing the causes and harmfulness of "moisture regain", we can certainly take corresponding measures to prevent or reduce it: First, try to reduce the indoor and outdoor temperature difference. Before the "moisture regain" occurs in the "cold tail and warm head", heat source equipment such as heaters and electric ovens are used to heat the room so that the indoor temperature is equal to or slightly higher than the outdoor temperature. Second, try to isolate the invasion of warm and humid air. Once the wind turns from north to south, doors and windows should be closed in time, and indoor wardrobes and doors should be closed to reduce the entry of warm and humid outdoor air. Third, put some moisture-absorbing and moisture-absorbing substances indoors. It is economical and ideal to use quicklime (massive lime) to absorb water vapor in the air and release heat when it melts, which has a heating effect on the room. Fourth, dehumidification depends on equipment. The air conditioner with dehumidification function should be turned on immediately. If possible, you can also use a dehumidifier (dehumidifier) to filter the indoor air for "dehydration" while continuing to heat the room. Fifth, articles that are afraid of humidity and are prone to mildew should be sealed and stored before the spring to isolate the air. If you can put desiccant, the effect will be better. Sixth, the cold and warm air currents frequently meet in spring and advance and retreat with each other. After the "resurgence" day, if the weather improves. In sunny weather, dry clothes and bedding at home and keep them dry.