Why lately it s cool during the day and hot at night

You must have cloudy weather there, less sunlight during the day, coupled with the heat absorption of water and stones, the temperature is naturally low, and at night due to the large specific heat capacity of water, the heat release of water and buildings makes the temperature rise, and it feels very hot.

This is a proverb that originated in ancient China. As we all know, the current solar calendar is formulated according to the laws of the sun, and it is closely related to the change of temperature. The lunar calendar that was common in ancient China was formulated according to the operation law of the moon (Taiyin), because there was a leap month, it did not correspond to the solar calendar in different years, and the difference was large.

Because the lunar calendar cannot accurately reflect the changes in the climate, in ancient times, which was dominated by agriculture, the 24 solar terms were set according to the angle of the sun's yellow longitude, and the solar terms and the solar calendar basically corresponded, and the beginning of autumn was one of them.

The proverbial "early" and "late" refer to the date of the lunar calendar rather than the time. For example, the first day of June is early, and the first day of July is late.

If autumn is the beginning of autumn on the first day of June, then the first day of July is the beginning of September in the solar calendar, so it is "cold"; And if autumn only begins on the first day of July, it is the beginning of August in the solar calendar, of course, "hot cows".

Not good for you. If you do not provide the specific geographical location (conditions) of your location, you can only be blind, and it is better not to be better than you, so as not to mislead you.

This is because the sun's radiant heat is absorbed by the earth during the day, and at night when the surface temperature drops, the heat absorbed by the earth is slowly released.

In a traditional building, even if the windows are open for ventilation, it feels much cooler indoors than outdoors. The indoor and outdoor air temperature when the windows are opened is about the same, and the reason why it feels much cooler indoors than outdoors is that the temperature of the inner surface of the building is much lower than that of the outer surface and the ground temperature of the building.

At around 21-22 o'clock at night, the peak temperature of the outer surface of the building during the day is delayed by the time of the building wall and just transmitted to the inner surface of the building, so it feels that the interior of the building is the hottest at this time.

Summer heat precautions.

In addition to indoor cooling, we should also pay attention to heatstroke prevention when we usually go out, it is best to bring a parasol and a bottle of mineral water, and try to avoid going out at noon.

Develop a good habit of napping: In summer, the days are long and the nights are short, many people will be sleepy, in order to solve this situation, you should develop a good habit of napping, even if it is a little squint, it can also greatly reduce your fatigue, which can easily improve the efficiency of afternoon work, take a nap for 30 minutes, but also balance the hormone secretion in the body, reduce the incidence of cardiovascular system diseases, can be described as a multi-task.

The above content refers to People's Daily Online-Why is it so hot this summer? , People's Daily Online-Summer health needs "hot nourishment" It turns out that we have been doing it wrong.

Because of the atmospheric effect.

The Earth's atmosphere has a strong selective absorption of surface longwave radiation, which absorbs longwave radiation and at the same time emits longwave radiation. Some of them escape into space, while others return to the surface and the lower atmosphere, so that the actual surface temperature in the presence of an atmosphere is higher than the average surface temperature in the absence of an atmosphere.

Thus, the presence of the Earth's atmosphere raises the average surface temperature by tens of degrees. In the past, this effect of the atmosphere was also referred to as the greenhouse effect, but studies have shown that the thermal insulation effect of greenhouses is not exactly the same as that of the atmosphere, and there is no such thing in the atmosphere as greenhouse coverings that cut off convective heat exchange.

1. Wear light-colored clothes: because white and light-colored clothes are slow to absorb heat, dissipate heat quickly, and wear cool; Black or blue clothes absorb heat quickly, dissipate heat slowly, and are stuffy and easy to heat stroke. acres and towns.

2. Wear a heat-insulated straw hat: The raw materials of woven straw hats are mostly hollow, and a certain amount of air is stored in them, and air is a poor conductor of heat. In addition, the straw hat also has a certain shading effect on sunlight radiation.

3. Rest at noon: The weather is cool in the morning, so the departure time should be early. Rest at noon and revisit after three or four o'clock in the afternoon.

4. Drink more lightly salted boiled water: Sweating a lot during summer travel reduces the salt in the body, and drinking more lightly salted boiled water can replenish the lost salt in the body. When drinking light salt water, it is necessary to drink it in small amounts and many times to have an effect.

5. Bring heatstroke prevention medicine; When traveling in summer, you should bring some medicines such as Rindan, Feng Youjing, and ten drops of water. The summer is hot because the solar altitude angle moves to the Tropic of Cancer after the summer solstice, the days are long and the nights are short, forming high temperature and rain, strong atmospheric inverse radiation, and good thermal insulation effect, so the summer is hot both day and night.

Heating is an indispensable household appliance for us in winter, so what's the matter with heating that is hot during the day and cold at night? Today, PCHOUSE will introduce you one by one.

The heating is hot during the day and cold at night, which may be caused by the difference in pressure during the day and at night, or it may be that other people's homes use the circulating pump, resulting in a smaller pressure difference between the supply and return water and the hot water not circulating.

What are the specific reasons?

1. Whether the valve of the radiator collapses or not, only open.

The radiator system should be tested in all aspects, the heating is not hot, the first thing to check is whether the valve is open, because some of the owners of the newly built community may be the first group of hail to use the heating equipment, the valve of the radiator will forget not to open. It is recommended that the valve of the radiator be opened before using it.

2. The pipes and radiators are blocked by debris.

At the beginning of the heating season of each year, because the radiator pipe is empty and useless, there may be some impurities in the pipe, and the guide beam causes the pipe to be blocked, so the radiator is not hot. At this time, professional repairers should be asked to carry out disassembly and assembly inspections to eliminate the blockage or reinstall the pipe to solve the problem.

3. "Air blockage" occurs in the radiator

The reason why the heating in some people's homes is not hot may be the accumulation of a large amount of gas in the radiator, which usually occurs in the early stage of heating, or the accumulation of gas in the pipes and radiators in the heating system, resulting in the problem of "gas blockage".

It is recommended to gently open the vent valve above the radiator, stop rotating the vent valve as soon as you hear the sound of gas being released, and repeat several times until there is a steady flow of water. People need to be reminded that when opening the air release valve, it should be gently unscrewed, not too hard, if the air release valve is broken, not only can it not be warmed, but also will cause the radiator to drip out.

The cool outdoor night is due to the drop in temperature at night, and in the more open and wide places, the atmospheric circulation constantly consumes heat, and the deposited heat will gradually dissipate, so it will be relatively cool outdoors at night. However, the indoor temperature is not as cool as the outdoor in most cases, because the building mainly uses air conditioning equipment, so the indoor heat cannot be quickly dissipated, and the indoor ventilation is poor, these factors all lead to the higher indoor temperature.

In addition, buildings are often designed to be airtight for energy and cost savings, which will increase the resistance of indoor air flow to a certain extent and reduce ventilation circulation. The reflection of light from buildings and the heating of electrical appliances, lighting and other equipment can also cause the indoor temperature to rise. Outdoors, relatively speaking, the atmosphere can circulate freely without being restricted by the airtight design of the building, and the heat is better dispersed and dissipated, which makes the outdoor temperature cooler than the indoors.

In addition, personal perception will also vary in judgment of outdoor and indoor temperature rises. Because human activities, clothing, sitting posture and other habits may affect the body's ability to self-regulate, so that people have a different sense of temperature.

In conclusion, the reason why outdoor is cooler at night than indoor is due to the process of heat dissipation from the heat consumed and deposited by the atmospheric circulation, as well as the effects of the building's air conditioning equipment and the resulting indoor temperature rise and poor ventilation. <>

During the day, the sun has been shining on the earth, and the earth absorbs sunlight, which must be hot, but it is not necessary to say that the sun sets at night, and there is no sunlight, so compared to the day, the night is definitely not as hot as the daytime.

1. Because there is sun during the day, it is very hot, and at night there is no sun, so it is cold. 2.Because of the revolution and autobiography of the earth, during the day we are close to the sun, so it is hot, and at night we have our backs to the sun, so we can't get sun, so it's cold.

Because there is the sun during the day, the temperature is very high, the sun will shine on the earth and stand everywhere, so we will feel very hot, but at night, when the sun sets, the temperature will also decrease, whether it is spring, summer, autumn or winter, after the temperature is lowered, it will be very cold.

Daytime temperatures are high. The temperature is low at night, and many people use the heating, so the pressure and temperature of the gas supply and heating are lower than during the day.

The heating is hot during the day and cold at night, because during the day you burn the heating, he is hot, and if you don't burn him, he is cold, so no one burns in the second half of the night, all in the state of sleeping, you just don't burn when you are cold, this is a normal phenomenon, so everyone should not take it as a normal thing, but also want to burn it is hot, and it is normal to be cold if you don't want to burn it.

of our country"Three major furnaces"On the banks of the Yangtze River are three famous cities: Chongqing, Wuhan, and Nanjing. It's very hot all day and night, and even the lowest temperature is very high and hot, with the lowest temperature around 28 degrees on most days. According to the Meteorological Observatory, the maximum temperature of a day of 35 degrees is called"Hot day", and the number of hot days in the tri-city is as many as 15 to 35 days a year, and there are often 37 degrees"Extremely hot day", among which the hot days in Chongqing are the most, and most of the highest temperatures in the three cities are above 40 degrees in history, so there is"Three major furnaces"called.

Why are these three places so hot?

First, in July and August every year, as soon as the plum rain in the middle and lower reaches of the Yangtze River passes, the high pressure temperature controls here, so that the movement of the lower layers of the air flow forms a closed dry weather and it is difficult to generate clouds and rain, and the surface temperature is very high. It has been determined that on very hot days, the maximum temperature on the ground can reach 65 degrees to 70 degrees.

Second, the three famous cities are located in the valley area of the Yangtze River basin. The altitude is low, the ground temperature and heat are not easy to dissipate, most of the heat is preserved, in addition, the air flows from the high place of the terrain to the valley, not only can not form clouds and rain, the temperature is getting higher and higher, at the same time, the rice fields along the Yangtze River are vertical and horizontal, the river network is dense, the oxygen content in the air is very much, the humidity is very large, the climate of high temperature and high humidity makes it difficult for human sweat to evaporate, makes people feel very stuffy.

Thirdly, because there is a lack of cool breeze here in summer. The air flow is mainly sinking, and the atmosphere is very stable, without even a hint of wind, which speeds up the hot atmosphere here.