**Abstract:** In this paper, we explore the application of seawater heat pump-based district heating and cooling systems in Stockholm, Sweden, as a model for sustainable energy use. Given the current challenges of energy consumption and environmental degradation in China, we analyze how similar systems could be implemented to reduce reliance on fossil fuels and improve energy efficiency. By comparing the climatic and geographical conditions between China and Sweden, we highlight the potential for large-scale adoption of seawater heat pump technology in China, particularly in coastal regions with access to seawater. **Keywords:** Seawater heat pump, District cooling, Stockholm, Renewable energy **Introduction** In the 21st century, energy and environmental issues have become major global concerns. The increasing carbon emissions from fossil fuel usage, especially in China, have led to severe air pollution and health problems. In 2002, building energy consumption accounted for nearly 28% of total national energy use, with a significant portion dedicated to air conditioning. This has created a growing demand for more sustainable and efficient cooling and heating solutions. The ocean, being a vast reservoir of renewable energy, offers an attractive alternative. Seawater, with its high thermal capacity, can serve as a stable source of both heating and cooling. Using heat pump technology, low-grade heat from seawater can be upgraded for district heating in winter, while cold seawater can be used directly for cooling in summer. This not only reduces energy consumption but also minimizes the need for freshwater resources, which is crucial in water-scarce regions like China. **Seawater Heat Pump Systems** A seawater heat pump system operates by transferring heat from seawater to buildings during winter and extracting heat from buildings to cool them in summer. Unlike traditional systems that rely on cooling towers or boilers, seawater heat pumps utilize the natural temperature differences in the ocean. This makes them highly efficient, especially when the seawater temperature remains relatively stable throughout the year. The system typically consists of a seawater intake and discharge system, a heat pump unit, a heat exchanger, and a distribution network. During summer, the seawater acts as a cooling medium, significantly improving the coefficient of performance (COP) of the system. In winter, the heat pump extracts warmth from the seawater, providing a clean and renewable source of heat. **Case Study: Stockholm, Sweden** Stockholm has been a pioneer in the use of seawater heat pumps for district heating and cooling. Over 60% of the city's residents are connected to the district heating network, which integrates various energy sources, including fossil fuels, biofuels, wastewater, and seawater. Approximately 50% of the heating comes from heat pump systems, while the remaining is supplemented by oil, electric, and coal-fired boilers. The district heating network in Stockholm spans over 765 km, serving millions of square meters of buildings. The system is divided into three main networks: Central, North-Western, and Southern. The use of seawater as a heat source has allowed the city to reduce its dependence on non-renewable energy, lower carbon emissions, and maintain a stable and efficient heating system. **Perspective in China** China’s coastal regions, such as those along the Yellow Sea and Bohai Sea, offer favorable conditions for implementing seawater heat pump systems. With seawater temperatures ranging from 2°C in winter to 20–30°C in summer, these areas are well-suited for both heating and cooling applications. Adopting such systems could significantly reduce energy consumption in buildings, decrease reliance on coal, and contribute to long-term environmental sustainability. While the technology is still in its early stages in China, the success of projects in Sweden provides a strong foundation for future development. With continued research, investment, and policy support, seawater heat pump systems could play a key role in China’s transition to a cleaner and more sustainable energy future.

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