Abstract: Modern society should be a conservation-oriented society, and social life should also be a life-saving energy conservation. As an inexhaustible new type of environmental protection energy, solar energy has become an important issue in the world's energy research. . It is a relatively simple, economical, environmentally-friendly, and reliable energy-saving measure for building heating and heating in China. This article summarizes the use of floor heating in civil buildings and proposes solutions for future development and utilization.
Keywords: solar energy new energy solar energy heating too hot energy exchange heating and heat exchange concentration control
As a kind of thermal radiation energy, solar energy is a kind of non-polluting clean energy. The development and utilization of solar energy has become one of the important research projects in the world to obtain and use new energy, carry out energy conservation and environmental protection, and has made great progress. Has entered the practical stage. In recent years, with the rapid development of China's economy and the importance attached to environmental protection, solar energy is an inexhaustible new type of environmentally friendly new energy. It is a simpler, more economical, environmentally friendly and reliable way to improve the built environment. The method, a heating and heating method that is very suitable for the current economic situation in China, has been greatly promoted and widely used in our country.
Its use of solar energy is highly efficient. It can not only heat and supply hot water, but also can be used in refrigeration and other aspects. However, it has the disadvantages of severe decline in the efficiency of collecting heat in rainy weather. In recent years, it has been widely used in urban and rural areas in China.
Solar heat pump heating system generally refers to the use of direct solar energy and solar energy stored in the air as the evaporator heat source, supplemented with a small amount of electric energy to drive the solar heat pump and the heat exchanger as a condenser heating system. It can be combined with a refrigeration system for summer cooling. The solar heat pump heating system consists of three parts: a heat pump unit, an auxiliary heat source system, and a solar heat collection system. The solar collector board is placed on an outdoor flat or roof. The refrigerant flows in the board. It absorbs solar radiation energy and the heat energy in the air vaporizes. After being compressed and heated by the compressor, the solar collector board exchanges water with the shell-and-tube heat exchanger. Heat, heat the water to 60 °C for heating or domestic water. In winter, the amount of solar radiation is small and the ambient temperature is very low. The solar heat pump is used for low-temperature solar heat collection, and solar energy is directly collected for heating. The main features of the solar heat pump heating system are that it can take several times more energy than electricity with a small amount of electric energy. At the same time, it can effectively use low-temperature heat sources, which is an effective means of solar energy heating.
Antifreeze selection and detection solutions
The medium inlet temperature of the heat exchanger connected to the ground source heat pump and the heat exchanger changes with time during operation, and is related to the undisturbed temperature of the underground deep rock, and the temperature of the underground deep rock is usually undisturbed. It is equal to the local average annual temperature, which can also be called the local ground temperature. It is an important parameter for designing the ground source heat pump system. In the case of winter heating, the inlet temperature of the heat pump is generally taken as the local ground temperature minus 8-11 °C, and the local temperature is low. When the temperature of the circulating fluid at the outlet of the heat pump evaporator falls below 0 °C, antifreeze should be added to the circulating fluid.
Commonly used antifreezes are: brine (Lv sodium and Lv calcium solution, ethylene glycol aqueous solution, propylene glycol aqueous solution, methanol and ethanol liquid), among which the salts and ethylene glycol aqueous solution is relatively safe, non-corrosive, has better Thermal conductivity, the viscosity of ethylene glycol increases under low temperature conditions, which requires increasing the power of the pump, thereby reducing the efficiency of the entire heat pump system, but the minimum operating temperature of ground source heat pump system is generally above 10 °C, so it is more suitable Ethylene glycol aqueous solution was used as an antifreeze solution.
By ATAGO (Atago) antifreeze concentration detection equipment leader of Thermal change antifreeze refractometer, (propylene glycol concentration meter) PAL-89S, (concentration of ethylene glycol) PAL-91S, an evaporator as a heat pump circulating fluid heating The main criterion for determining the heat source. The temperature of the heat exchange system of all buildings is much higher than the outdoor air temperature , and it can be used as a heat source for air intake heating. Heating and ventilation system for the building and civil construction in agriculture, with great importance.
The heat pump heat exchanger is a heat exchanger connected to a geothermal heat exchanger. One side of the heat exchanger is a refrigerant and the other is water or antifreeze. The heat exchanger transfers indoor cooling load to water or antifreeze through a refrigerant in summer. The liquid, water, or antifreeze is continuously circulated to release heat into the soil layer, so the heat exchanger functions as a condenser in summer and the heat in the soil is extracted and transferred to the refrigerant in winter because it acts as an evaporator and heats. The heat exchange capacity of the exchanger is mainly related to the inlet temperature and flow rate of the circulating medium (water or antifreeze).
in conclusion
Different antifreeze heat transfer capacity reference figures
The same kind of antifreeze with the concentration provided, gradually reduce the heat transfer capacity, because its viscosity also increases with the increase of the concentration, because the pump's power consumption also increases, to meet the use of temperature, should try to use low Concentration of antifreeze, play anti-corrosion performance to save operating costs!
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