The development direction of solar water heaters and building integration

Views: 7     Author: 1stsunflower     Publish Time: 2019-07-21      Origin: Site



With the development of the economy, the acceleration of urbanization and the improvement of people's living standards, the urban construction area of many areas has increased sharply, and the increase of building area has also led to the rapid growth of energy required for heating and cooling.Therefore, building energy efficiency will be the focus of the entire society.

In addition, traditional building heating is mainly provided by coal and oil, which not only causes huge waste of energy, but also brings great pressure on environmental protection.

[Main body]

Many countries around the world strongly support the application of Solar Heating For Radiant Floor Heating Systems on buildings. Here are a few typical ways to introduce them briefly.


1. Germany

Located in Germany, a residential area with more than 200 households, all residential flats and parking lots are equipped with flat solar collectors, and 528pcs 30m deep metal U-shaped pipes are buried under the lawn.

Area: 5000㎡ Water tank: 200T

In the summer, when the water temperature of the water tank reaches 90 °C, the control system will start the circulation pump, and the hot water in the water tank will be heated by the U-tube to the soil under the armpit, and the heat energy will be stored in the underground U-shaped pipe to a depth of 30m, summer soil. The temperature can reach 65 °C.

In the winter, when the solar energy cannot meet the requirements of domestic hot water and heating, the control system circulates the water in the water tank from the underground U-tube, and takes out the heat stored in the underground in the summer. When it is still not enough, it is provided by the gas boiler.


It can guarantee the stable hot water and heating requirements of the whole community.


① system is complex and control requirements are high.

② The cost is too high and it is difficult to commercialize unless there is a large subsidy.

③ The use of flat solar collectors, because the insulation performance is not particularly good, in the winter when used for floor heating, the efficiency is too low.


2. Austria

Located in Germany. A solar heating system that has been marketed in Austria, the Netherlands, etc.:

This is a solution that needs to be installed in an apartment building heating system. The heating area is 1500㎡, the flat collector area is 240㎡, the water tank is 20㎡, the heating inlet and outlet water temperature is 65°C and 40°C, and the room temperature is 20°C. The guarantee rate is 20%.


① Technology is mature, this type of system has been widely used in Western Europe.

② From the system design, collectors, water tanks and accessories production engineering installation has formed a professional industrial chain.


① The overall system is inefficient, especially in winter.

② The system is complex, high in cost, and difficult to commercialize.


3. Eastern Europe

A solar heating system that is popular in Eastern Europe and is used in Poland, the Czech Republic and Spain.

The system features two water tanks, a low-temperature water tank connected to the flat solar collector, and a high-temperature water tank connected to the boiler.


The purpose of using two water tanks is to solve the problem of low temperature efficiency of the flat panel collector in winter, and to maximize the utilization of solar energy, and the utilization rate of the whole system of solar energy is improved.


In winter, in order to keep warm, the water temperature of the water tank must be kept higher than 60 ° C, but the temperature of the external environment is often around minus 10 ° C, or even lower. At this time, the efficiency of the flat collector is extremely low and it is difficult to function.


4. South Korea

The development direction of solar water heaters and building integration

This is a commonly used solar heating and heating scheme in South Korea. It uses a double coiled water tank and the backup energy is a gas water heater.

At the same time, a solar heat pipe collector is adopted, and the solar heat pipe collector is more reasonable than the flat collector for heating the floor heating.

Because the heat pipe collector is much more efficient than the flat solar collector in the case where the temperature in the water tank is high and the environment is low.


① Simple and practical, the technical requirements for dealers and installers are not high, and the popularity is high.

② Heat pipe solar collectors have high efficiency and improve solar energy utilization.


① It is necessary to pay attention to the accurate calculation according to the specific conditions of the project, and also to comprehensively determine the configuration of the solar heating system, especially the area of the solar collector and the capacity of the water tank.

② The design area of solar collectors is too large, resulting in high investment costs and low effective utilization of solar energy.

③ The design area of the solar collector is too small, the standby energy consumption is large, and the effect of energy saving and cost reduction is not obvious.

More program designs can refer to this website.



Each of the above solutions has its own advantages and disadvantages, but one thing is certain that the application of solar energy on heated floors is an irresistible trend, and many countries have now introduced corresponding policies to encourage the use of solar energy. Since solar water heaters are installed in different countries and are not the same as buildings, solar water heaters and buildings should not have only one mode.

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