Why does a room temperature of 20 degrees feel cold in winter and hot at room temperature of 20 degr

This is due to the relative temperature difference between indoor and outdoor, as well as the influence of wind direction, the summer blows a warm wind, affected by the warm current, and the winter blows a cold wind affected by the cold current, the temperature of the wind is not the same, and people's perception is also different.

Because of the difference in air humidity, if the air humidity reaches a certain value, the sweat on the surface of the ** will not be volatilized, resulting in people feeling stuffy, and the air humidity is relatively low in winter, and the sweat is easy to volatilize, so that people feel cold at the same temperature.

This is mainly the human sensory system that is at work, even if it is 20 degrees in winter, humans will tell themselves that it is winter, so it will feel very cold, but in summer it is different, it feels just the opposite.

The degree of warmth and coldness felt by the human body, converted into the same temperature, will be affected by the combination of air temperature, wind speed, air pressure and relative humidity. The temperature depends not only on the cold and the heat.

In the summer, the evaporation of sweat on the surface can take away some of the heat, but if you are in a humid environment, the sweat evaporates more slowly, and the heat dissipation is slower, and you will feel hotter.

In winter, you rely on the thermal insulation effect of your clothes to keep you warm, and water conducts heat better than dry air, that is, wet clothes conduct heat better than dry clothes, which makes it easier to lose heat from your body, and you feel colder.

In addition to this, solar radiation can also affect the perceived temperature. At the same temperature, the perceived temperature when the sun is shining will be higher than when it is cloudy, on the one hand, because the solar radiation itself can provide heat, and on the other hand, it also has the effect of the weather on psychological suggestion.

You may have a cold, sometimes it is a precursor to a cold, and it is easy to get chills before you have a fever, so drink plenty of fluids.

The human body mainly dissipates heat in three ways: convection, radiation, sweat evaporation and breathing, due to metabolism, the human body is constantly generating heat, and the heat is dissipated in different ways to achieve a comfortable state. The surface temperature of the human body will rise when there is less heat dissipation, and the person will feel the heat. And the surface temperature of the human body that dissipates more heat will drop, and people will feel cold.

The main thing is radiation, if it is summer, although the indoor temperature is only 20 degrees, but the outside is definitely higher than the indoors, the heat radiation makes you feel higher than 20 degrees, although the indoor 20 degrees in winter, but the outdoor temperature is much lower, the heat on the body is transmitted to the outside through radiation, so it feels cold.

There are two factors:

A feeling of temperature difference, because in both summer and winter you have adapted to the outside temperature, or rather, you are used to that temperature. So the body will give you a message that 22 degrees in winter is hot and cold in summer.

There is a difference between the two people's clothing, you still wear cotton at 22 degrees in the winter, but in the summer you wear single. I don't believe you try wearing a short sleeve in the air conditioner at 22 degrees, it will definitely not be so hot.

The temperature of the inner surface of the wall in summer is greater than the inner surface temperature of the wall in winter, so that the radiation between the human body and the wall transfers more heat in winter than in summer, so people will not feel cold in summer when they cover the summer cool quilt, but they will feel cold in winter.

The human body loses heat in the room by convective heat transfer and radiative heat transfer, and the indoor temperature does not change when there is air conditioning, and the convection heat dissipation does not change in winter and summer. Because the outdoor temperature is higher than the indoor temperature in summer and the outdoor temperature is lower than the indoor temperature in winter, the temperature distribution in the wall is the same, and the temperature of the inner surface of the wall is different in summer and winter. Obviously, the temperature of the inner surface of the wall in summer is greater than that of the inner surface of the wall in winter, so that the radiation between the human body and the wall transfers more heat in winter than in summer.

In a room with a room temperature of 26, the body dissipates more heat in winter than in summer, and it feels cold.

Strengthening heat preservation can reduce the heat dissipation of the human body, and people will not feel cold when adding sweaters in winter.

Most of the temperature on the earth is the heat energy obtained by the sun's irradiation, and in summer, when the sun is close to the earth, the earth obtains more heat energy, and some of it is emitted and replenished the next day; In winter, the sun is far away from the earth, although there is sunlight, but the heat energy emitted by the sun reaches the earth and is absorbed, and the heat is replenished after dissipation, and the heat volatilizes quickly.

First of all, the biggest difference between winter and summer is the difference in outdoor temperature. In summer, the outdoor temperature is warmer than the indoor temperature, so the direction of heat transfer through the wall is from the outside to the indoor. In winter, the outdoor temperature is lower than that indoors, and the direction of heat transfer through the wall is from indoor to outdoor.

As a result, the temperature of the inner surface of the wall is different in winter and summer, high in summer and low in winter. Therefore, although the indoor temperature in winter (26) is the same as the temperature in summer (26), the body dissipates heat from the walls through radiation in winter much higher than in summer. According to the principle that the human body feels the cold feeling mainly by the amount of heat dissipation, the heat dissipation is large in winter, so it is necessary to wear a thicker velvet jacket.

The room temperature is also 22 degrees, so why is it hot in summer and cold in winter? There are two factors: one The feeling of temperature difference, because in both summer and winter you have adapted to the outside temperature, or rather, you are used to that temperature.

In summer, the monsoon is sea breeze and is relatively humid; The winter monsoon is a land breeze and is relatively dry.

Environment. Because the surroundings are relatively hot in summer, 25°C is not as cold as in winter.

In summer, air conditioning is a process of heat absorption, and the temperature of the surrounding objects is higher (including people), and the heat absorbed by the air conditioner is relatively small for people, and people must increase the contact surface with the air to dissipate more heat.

In winter, air conditioning is an exothermic process, and the surrounding objects are also absorbing heat, if you wear less clothes, it is equivalent to being a heat release body, you will feel cold, only by wearing a little more clothes, can you put a little less heat and maintain a certain body temperature.