Buried underground heat pump central air conditioning to create energy-efficient housing
In the absence of traditional boiler rooms in winter and cooling towers in summer, a new technology has emerged that directly utilizes underground soil temperature and the seasonal temperature difference between the ground and surface to provide air conditioning and heating. This innovative system, known as the ground-source heat pump, is now widely adopted in the Binhai New Area.
Experts highlight that this buried tube ground-source heat pump technology offers multiple advantages, including environmental protection, energy efficiency, and cost-effectiveness. It is also monitored by state authorities, ensuring its reliability. Compared to conventional central air conditioning systems, the energy efficiency ratio (EER) of this technology can reach 4:1 or higher, surpassing traditional systems by over 30%. In terms of energy savings, it can reduce consumption by more than 50%.
If 100 million square meters of buildings were to adopt this technology, it would save approximately 11,900 tons of standard coal annually, reduce carbon emissions by 130 million cubic meters, and save nearly 100 million yuan in initial investment. Additionally, annual operating costs could be cut by around 10 million yuan, with significant savings on land use for infrastructure.
At a large printing company located in the Airport Logistics Processing Zone, covering over 20,000 square meters, there are no visible boiler rooms or cooling towers. The indoor environment remains comfortable year-round. According to technical staff from Tianjin Cold Technology Company, the facility's heating and cooling systems are not installed on the surface. Instead, the heat exchanger is buried deep underground, reaching a depth of 100 meters. The underground soil maintains an average temperature of 16°C, making it an ideal source of thermal energy.
During summer, the ground is cooler than the surface, allowing the system to extract coolness and transfer it indoors. In winter, the opposite occurs—heat from the ground is absorbed and used to warm the building. This process involves a closed-loop water circulation system embedded in the soil, where heat is exchanged with the surrounding earth. The system operates without affecting groundwater resources, and it does not rely on fuel oil, natural gas, or coal. It can be flexibly controlled based on demand, and the system automatically adjusts for optimal comfort. Indoor temperatures typically reach 26°C in winter and 22°C in summer.
The key feature of the buried ground-source heat pump central air-conditioning system is its ability to utilize the earth as a natural source of both cooling and heating. This technology has been successfully implemented in over 20 projects, including the Tianjin Bonded Holdings Building, Huiyuan Printing Co., Ltd., Toray’s foreign storage and transportation facilities, and Manor Man King Manor, among others. These applications have yielded significant social and economic benefits, demonstrating the long-term value and sustainability of this green technology.
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