Is the exhaust valve of the heating terminal always open or closed?

The exhaust valve on the radiator is closed after exhausting, and the automatic exhaust valve at the end of the system is always open.

Floor heating is to achieve the purpose of heating by heating pipes buried under the floor (the surface temperature of the floor is generally between 25 and 30 degrees), and the floor radiates heat to the room. It can be divided into two types: hot water type low-temperature floor radiant heating (liquid circulation system) and electric heating type low-temperature floor radiant heating (electric floor heating).

Compared with radiator heating, floor heating has the following advantages: the room temperature distribution is relatively uniform, and the room temperature difference is small; The indoor temperature gradually decreases from bottom to top and feels comfortable; Large radiation area, saving space, etc.

Because the floor surface temperature has a limit value (the highest value is generally 29℃ to 35℃), otherwise it will be harmful to health, damage the composite floor and limit the heat dissipation of floor heating, so it is not suitable for areas with heavy heat load (cold areas or buildings with poor insulation), or add radiators or wall heating supplements.

Extended data

Sometimes "radiator" is also called "heating" Cities north of Huaihe River in Qinling Mountains of China (northwestern Shaanxi, northern Henan, Shandong, Hebei, Beijing, Tianjin, Shanxi, Gansu, Qinghai, Ningxia, Inner Mongolia, most of Xinjiang, Heilongjiang, Jilin, Liaoning, etc.). ) have built the city's heating pipe network, operated by the government or a company designated by the government, providing central heating services in winter. The service level, charging standards and heating start and end dates vary from place to place.

In the cities south of Qinhuai River, there is generally no city-wide heating pipe network, but there is a small-scale heating pipe network (for example, in a residential area, a campus and a factory).

Central heating has obvious benefits, good heating effect, high resource utilization rate and low average cost. The main disadvantages are: tenants have no choice but to adjust the temperature; The heating effect of high-rise residents is relatively poor, but the charges are the same; It is unfair for some households to use heating as usual (in view of this, some areas have begun to transform pipe network facilities into one valve for each household, refusing to provide heating for households with arrears).