Our province is located in the north temperate zone and the winter is cold. Heating is the basic living requirement for wintering by urban residents. Traditional radiator heating methods can no longer meet the living requirements of occupants. Energy saving, environmental protection and improving the quality of living environment are the development of heating methods. In recent years, many new heating methods have emerged. In many new heating technologies, floor heating is undoubtedly the best heating method for thermal comfort, and it is increasingly welcomed by modern people. Floor heating is a technique in which a heat-resisting pipe is embedded in a floor, and the floor is heated with low-temperature hot water, and then the floor is heated mainly by radiation. The radiant heating method saves energy by about 10% to 30% compared with the convection heating method. %. The energy-saving advantages of floor heating are reflected in the following aspects.
First, reduce the interior design temperature and save energy. Radiant heating is different from convection heating in that it does not directly heat the air in the room. When using low-temperature hot water heating by ground radiant heating, the heat is mainly transmitted in the form of radiation, and the radiation heat dissipation accounts for more than 60% of the total heat dissipation. The transmission method is rapid and direct, heat can be transmitted to the heating object without any medium, and the thermal efficiency is improved. The interior design temperature can be reduced by 2~3°C compared to other heating forms, so the floor heating can be obtained with a lower interior design temperature Radiator has a higher indoor design temperature and the same heating effect. The relevant technical data shows that the reduction of the interior design temperature means that the indoor heating heat load is reduced. For example, the room temperature can be reduced by 1° C., which can save energy by nearly 10%.
Second, it can avoid the local heat loss of the radiator. Usually, the radiator is arranged along the outer wall under the window sill. The rising hot air flow formed near the inner wall of the wall will affect the cool air falling from the window into the room and increase the temperature of the window surface. This kind of heating method often causes the temperature of the wall on the back of the radiator to rise significantly. After testing, about 10% of the heat is often wasted through the odorless loss of the external wall, and there is no such large loss of radiant floor heating.
Third, the heat storage of the floor material makes the thermal stability better. The upper part of the floor heating pipe generally has a 30-50mm thick protective layer, the heat capacity is large, and the floorboard is also larger than the heat storage capacity of the radiator heating system. Therefore, this heating method has the advantage of better thermal stability even if the hot water is turned off. The valve reduces the temperature of the water supply, and the material stored in the filling layer keeps the room temperature longer. Once the heating of the radiator turns off the heating valve, the room temperature will decrease rapidly. The application practice shows that the heat storage of the floor radiant heat supply also has a certain energy-saving effect.
Fourth, the floor heating to facilitate the implementation of household heat metering. The sub-room temperature control of ground radiant heating requires a loop design. It is arranged separately according to the room. Each branch of the manifold is equipped with a flow control valve so that each room can meet the design requirement flow, thus avoiding the consistent pipe length. The overheating and waste phenomena caused by consistent and over-designed flows have been adapted to changes in the supply of heat, reaching on-demand supply, and achieving energy-saving behavior.
Fifth, the height of the additional heat loss is small. In the ground-radiation heating system, the room temperature changes in the vertical direction indoors, the ground surface temperature approaches 30° C., and the temperature of the radiant heating floor is higher than the space temperature. Since the temperature in the upper space is low, the reactive heat from the upper space is greatly reduced. loss. For the general construction project, the loss in this part is not very obvious, but for the high-rise building space, the energy-saving effect is obvious.
First, reduce the interior design temperature and save energy. Radiant heating is different from convection heating in that it does not directly heat the air in the room. When using low-temperature hot water heating by ground radiant heating, the heat is mainly transmitted in the form of radiation, and the radiation heat dissipation accounts for more than 60% of the total heat dissipation. The transmission method is rapid and direct, heat can be transmitted to the heating object without any medium, and the thermal efficiency is improved. The interior design temperature can be reduced by 2~3°C compared to other heating forms, so the floor heating can be obtained with a lower interior design temperature Radiator has a higher indoor design temperature and the same heating effect. The relevant technical data shows that the reduction of the interior design temperature means that the indoor heating heat load is reduced. For example, the room temperature can be reduced by 1° C., which can save energy by nearly 10%.
Second, it can avoid the local heat loss of the radiator. Usually, the radiator is arranged along the outer wall under the window sill. The rising hot air flow formed near the inner wall of the wall will affect the cool air falling from the window into the room and increase the temperature of the window surface. This kind of heating method often causes the temperature of the wall on the back of the radiator to rise significantly. After testing, about 10% of the heat is often wasted through the odorless loss of the external wall, and there is no such large loss of radiant floor heating.
Third, the heat storage of the floor material makes the thermal stability better. The upper part of the floor heating pipe generally has a 30-50mm thick protective layer, the heat capacity is large, and the floorboard is also larger than the heat storage capacity of the radiator heating system. Therefore, this heating method has the advantage of better thermal stability even if the hot water is turned off. The valve reduces the temperature of the water supply, and the material stored in the filling layer keeps the room temperature longer. Once the heating of the radiator turns off the heating valve, the room temperature will decrease rapidly. The application practice shows that the heat storage of the floor radiant heat supply also has a certain energy-saving effect.
Fourth, the floor heating to facilitate the implementation of household heat metering. The sub-room temperature control of ground radiant heating requires a loop design. It is arranged separately according to the room. Each branch of the manifold is equipped with a flow control valve so that each room can meet the design requirement flow, thus avoiding the consistent pipe length. The overheating and waste phenomena caused by consistent and over-designed flows have been adapted to changes in the supply of heat, reaching on-demand supply, and achieving energy-saving behavior.
Fifth, the height of the additional heat loss is small. In the ground-radiation heating system, the room temperature changes in the vertical direction indoors, the ground surface temperature approaches 30° C., and the temperature of the radiant heating floor is higher than the space temperature. Since the temperature in the upper space is low, the reactive heat from the upper space is greatly reduced. loss. For the general construction project, the loss in this part is not very obvious, but for the high-rise building space, the energy-saving effect is obvious.
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