The importance of energy conservation and environmental protection is also remembered in our hearts again and again when we are hurt by the environment again and again. Because of this, the use of energy-saving and environmentally friendly equipment has become the pursuit of many people. As a relatively energy-saving and stable equipment, ground-source heat pumps have been deeply utilized in all walks of life. The different underground layers also affect the use of ground source heat pumps. The ground-source heat pump system of buried soil heat exchangers makes full use of this. A kind of shallow low-temperature geothermal energy, the earth is used as a heat exchanger to transfer heat, and the heat pump energy is used to raise it and then send it to the use part. The following is the basic common sense. Thermal characteristics The thermal characteristics mainly include thermal conductivity, volumetric heat capacity, thermal diffusivity, and the like. The thermal conductivity indicates a thermophysical property index of soil heat transfer capacity. The quantity is Kcal/m·h·°C. The volumetric heat capacity of the soil characterizes the heat storage capacity of the soil, while the thermal diffusivity characterizes the rate of change of the soil temperature field. . The thermal conductivity, volumetric heat capacity, and diffusivity vary with soil composition, structure, density, and water content, and vary with regions and seasons. In the same area, the calorific value of the soil is 80% of the heat absorbed by the soil. Earth temperature The understanding of the soil temperature in the earth is very important, because the temperature difference between the earth and the circulating water drives the heat transfer. The earth temperature is close to the average surface temperature of the whole year. According to the measurement, the soil temperature of 10m deep is close to the whole year of the region. The average temperature is not affected by the season. Deviation from the average temperature of ±15°C at a depth of 0.3m is ±5°C at a depth of 3m, and ±1.5°C at a depth of 6m, the temperature fluctuation fluctuates in a deeper place. According to practice, the average underground temperature is below 60m depth. Considered to be constant. The deeper the soil, the better the heat pump operation. The drilling depth of this project is 100mm. Moisture content The moisture content of the soil is an important factor affecting the heat transfer capacity, but after the water replaces the air between the soil particles, it reduces the contact thermal resistance between the particles and improves the heat transfer capacity. When the water content of the soil is greater than a certain value, the soil heat conduction system is constant, called the critical moisture content. Below this time, the thermal conductivity decreases. During the summer cooling, the heat exchanger transfers heat to the soil, and the heat exchanger The water in the surrounding soil is expelled by heat. If the soil is at a critical moisture content, the heat transfer coefficient of the soil is reduced due to the decrease of water, and the vicious cycle causes the soil moisture to be more repelled. The decrease of soil moisture content makes the attenuation of soil heat absorption capacity relatively larger than that of soil heat release capacity. Therefore, the use of geocoupling tubes in dry high temperature areas should take into account the thermal instability of the soil. In actual operation, the water content of the soil can be improved by artificially adding water. In areas with high groundwater level and low cold load in northern China, the soil moisture content will remain above the critical point, which can be considered as the majority of the area. Years are moist soil. Groundwater flow The seepage of groundwater has a significant effect on the heat transfer of the earth. In fact, the geological structure of the earth is complex, with loose clay layers, sand layers, sedimentary rock layers, air and water layers. Due to the tectonic movement of the earth, wrinkles, slopes and fractures occur in each rock layer. The rainfall penetrates into the soil layer, moves to a deeper layer under the action of gravity, and finally stays in the impervious layer. Groundwater flows in the voids to create seepage, which not only conducts heat transfer but also convects heat. If the groundwater seepage flow rate is greater than 8mm/h, it can be calculated according to the heat transfer of water. More and more energy-saving products, more and more users, more energy-saving products to save energy for the planet, for the benefit of future generations. Concerned about surprises Label: Analysis of characteristics of ground source heat pump buried pipe Previous: Application of linear motor on high speed machine tool Next: Four ways of joint operation of wooden door hardware
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