Every winter, the climate is extremely dry. According to the survey, in the northern area 120 heating days, only 2.5 days reached the healthy humidity. Another study shows that indoor air pollution is 5- 10 times that of outdoor air, so many people lack moist and clean air in winter. Through the study of epidemic diseases, scientists have found that the incidence of diphtheria, influenza, whooping cough, meningitis, asthma and bronchitis is very high. It increases significantly in dry winter. There are many reasons for these diseases. In addition to the low temperature in winter, the temperature difference changes greatly, and the human body's resistance decreases, there are two reasons: First, the low relative humidity of the environment accelerates the reproduction of influenza virus and pathogenic Gram-positive bacteria, and spreads with dust, causing the epidemic of diseases. Secondly, low relative humidity will reduce the resistance of human respiratory system and induce and aggravate respiratory diseases. Therefore, in a sense, to defeat the drought is to defeat the epidemic. The best combination of indoor microclimate in winter is: temperature 18-25℃ and relative humidity 45-65% RH. At this time, people's physical and mental state is good, and good results can be achieved regardless of work and rest. At present, all kinds of humidifiers on the market can control the relative humidity in the most suitable humidity range for human body, which can not only inhibit the breeding and spread of germs, but also improve immunity.
The texture of China's paintings and calligraphy is fiber or organic materials such as rice paper, silk and twill. After a long time, it is easy to be eaten by insects or damaged by aging. The ancients had a special discussion on the preservation of calligraphy and painting. Nowadays, in addition to learning some traditional methods of the ancients, the collection of calligraphy and painting is more particular. Generally, you must bring white spinning gloves when touching calligraphy and painting to avoid oil stains on your hands. Don't talk or cough when painting and calligraphy are unfolded, so as not to spit on the screen and form mildew spots in the coming year. According to scientific data, the survival temperature of most moths and molds is above 10℃. Below this temperature, pests lose their activity and stop breeding, while when the relative humidity is below 65%, most molds cannot develop normally. Therefore, for qualified collectors, the temperature of painting and calligraphy warehouse should be controlled at 10 ~ 18℃ and the relative humidity should be controlled at 50%-65%, which can inhibit the growth and reproduction of pests and molds and is beneficial to the maintenance of painting and calligraphy paper. If the relative humidity is reduced below 45% for a long time, the paper will become brittle due to drying, resulting in physical decay. Therefore, maintaining the lower limit of relative humidity of 50% is a strict requirement for the preservation of calligraphy and painting. In order to prevent calligraphy and painting from being eaten by insects, chemical repellents, such as naphthalene, camphor essence, benzene dichloride or other solid drugs with special odor and toxicity, are generally used, and moths can be effectively killed or driven by their odor-prone characteristics.
Edit the appropriate relative humidity values in this section.
According to the research of physiologists, when the indoor temperature is too high, it will affect people's body temperature regulation function. Due to poor heat dissipation, it will lead to higher body temperature, vasodilation, faster pulse and faster heart rate. In winter, if the indoor temperature is always above 25℃, people will be exhausted, dizzy, slow-thinking and poor memory. At the same time, due to the large temperature difference between indoor and outdoor, it is difficult for human body to adapt and it is easy to catch a cold. If the indoor temperature is too low, the metabolic function of the human body will be reduced, the pulse and breathing will slow down, the subcutaneous blood vessels will contract, the skin will be excessively tense, and the resistance of the respiratory mucosa will be weakened, which will easily induce respiratory diseases. Therefore, scientists set the lower limit temperature of "cold tolerance" and the upper limit temperature of "heat tolerance" as 1 1℃ and 32℃ respectively. While paying attention to indoor temperature adjustment, we should also pay attention to indoor relative humidity. In summer, the indoor relative humidity is too high, which will inhibit the heat dissipation of the human body and make people feel very stuffy and irritable. When the indoor relative humidity is high in winter, it will accelerate heat conduction and make people feel cold and depressed. When the indoor relative humidity is too low, people will feel thirsty, dry tongue, even sore throat, hoarse voice and nosebleeds. And it is easy to catch a cold because of the large loss of water in the upper respiratory mucosa. Therefore, experts believe that the upper limit of relative humidity should not exceed 80% and the lower limit should not be lower than 30%. However, people's somatosensory perception is not simply affected by temperature or relative humidity, but the result of its comprehensive action. The most comfortable indoor temperature and humidity are: winter temperature is 18 ~ 25℃ and relative humidity is 30% ~ 80%; In summer, the temperature is 23 to 28℃ and the relative humidity is 30% to 60%. More than 95% people feel comfortable in this range. In an air-conditioned room, people will feel most comfortable when the room temperature is 19 to 24℃ and the humidity is 40% to 50%. If we consider the influence of temperature and relative humidity on people's thinking activities, the most suitable room temperature should be high working efficiency. 18℃ and the relative humidity should be 40% to 60%. At this time, people's mental state is good and their thinking is the most agile.