Analysis of Low Temperature Cross Seasonal Thermal Storage Technology

Analysis of Low Temperature Cross Seasonal Thermal Storage Technology

Source: This website Release time: October 12, 2024 22:02:43

Analysis of Low Temperature Cross Seasonal Thermal Storage Technology

Low temperature cross season heat storage technology stores various types of waste heat, solar energy, and other heat from non heating seasons for heating during the heating season, with a storage time of more than six months. This technology can effectively reduce the carbon emissions of heating systems.

At present, there are two types of cross seasonal heat storage technologies: high-temperature heat storage and low-temperature heat storage, represented by high-temperature water tank heat storage and buried pipe heat storage, with different application fields. High temperature thermal storage technology is suitable for large centralized thermal storage systems, while low-temperature thermal storage technology is more suitable for small and medium-sized distributed thermal storage systems. This article focuses on the cross seasonal thermal storage technology of low-temperature buried pipes.

Underground heat storage is a form of soil heat storage that utilizes buried pipes to transfer heat to the soil for storage. The soil has poor heating capacity, and this technology is more suitable for storing low-temperature heat, especially for storing low-temperature waste heat and solar energy.

Underground pipes have low heat storage temperatures, so the amount of heat extracted is relatively small, making them more suitable for distributed energy storage, especially in rural areas with abundant land resources, suburban factories, and other places. Rural areas can adopt PVT technology to transfer the waste heat from photovoltaic power generation into underground storage, which is equivalent to using buried pipes to dissipate heat from photovoltaic panels and improve power generation efficiency; Factories can store the heat of cooling water underground, reducing the load on cooling towers and lowering production energy and water consumption, killing two birds with one stone.

The temperature of underground pipe heat storage is low, and a heat pump is needed to provide heating when using heat. Low price electricity sources such as valley power and photovoltaics can be used to drive compression heat pumps to generate hot water, while short-term heat storage devices such as water tanks can be used to ensure heating quality; Steam/hot water driven absorption heat pumps can also be used to absorb soil heat.

Due to the fact that low-temperature cross seasonal heat storage technology can generate sufficient heating capacity in winter, it can not only meet the self use heat load but also provide heating to the surrounding areas. Especially in low-density areas at the end of the centralized heating network, using this technology not only eliminates the need for heat sources for heating, but also allows for reverse heating to the urban area through the heating network, further increasing revenue.

The cross seasonal thermal storage technology of buried pipes is not a very sophisticated technology, but has already been applied in ground source heat pump systems. However, there are some issues with a standalone ground source heat pump system.

Ground source heat pump system, if only used for winter heating, the soil cannot replenish heat, and the temperature of the buried pipes will become lower and lower, seriously affecting the heating effect; If heating is provided in winter and cooling is provided in summer, the operating effect will be much better. However, if the cold and heat are not matched, problems will still occur. At the same time, there are not many occasions that require both cooling and heating.

However, in the dual-purpose ground source heat pump mode, the cooling water generated during summer cooling enters the buried pipes for heat dissipation, which is equivalent to storing waste heat for use in winter heating. This forms the simplest cross seasonal heat storage system and proves the feasibility of low-temperature cross seasonal heat storage technology using buried pipes. As long as a suitable method of supplementing waste heat or solar low-temperature heat is found, a stable cross seasonal heating system can be formed.

In addition, in low-temperature cross seasonal heat storage systems, buried pipes can not only achieve long-term cross seasonal heat storage, but also short-term heat storage based on energy prices, waste heat sources (such as solar energy), etc., further reducing operating costs.

Low temperature cross season heat storage technology stores low-temperature waste heat from non heating seasons for winter heating. Compared with direct waste heat heating, the heating capacity is doubled, which can replace conventional heating energy on a large scale and reduce heating carbon emissions. It is an important energy-saving and carbon reduction technology in the heating field.

In addition, high-temperature cross seasonal thermal storage technology is also being developed and demonstrated in the construction process. Compared to low-temperature cross seasonal heat storage technology, high-temperature technology has a larger scale, less heat dissipation, and more significant energy-saving effects. After the successful construction of the demonstration project, it will guide the development of new directions in the energy-saving heating market.