**Abstract:** In this paper, we examine the current energy and environmental challenges in China and explore the potential of seawater heat pump-based district heating and cooling systems. By analyzing the successful implementation of such systems in Stockholm, Sweden, we highlight their energy-saving and environmental benefits. A comparative study between China and Sweden reveals the promising future for adopting similar technologies in China, especially considering its coastal resources and growing demand for sustainable energy solutions. **Keywords:** Seawater heat pump, District cooling, Stockholm, Environmental protection **Application of Seawater Heat Pump Systems in Stockholm and Its Perspective in China** School of Civil and Hydraulic Engineering, Dalian University of Technology Jiang Shuang, Li Zhen, Duanmu Lin **Abstract:** District cooling and heating using seawater heat pump systems represent an underutilized resource in China with significant potential for energy conservation and environmental protection. This paper introduces the district cooling and heating systems in Stockholm, Sweden, which have been successfully implemented for decades. Through analysis of the climatic and geographical differences between Sweden and China, we conclude that the application of seawater heat pump systems in China has a broad and promising future. **Keywords:** Seawater heat pump, Sweden, District cooling **1. Background** In the 21st century, energy and environmental issues have become major global concerns. The rising levels of greenhouse gases, particularly carbon dioxide, have led to global warming, prompting increased interest in sustainable energy solutions. In China, coal remains the primary energy source, contributing significantly to pollution and environmental degradation. The rapid growth of energy consumption, especially in urban areas, has created a heavy burden on both the environment and the power grid. With the increasing demand for air conditioning, building energy consumption has risen sharply, leading to greater electricity demand and supply shortages. As a result, researchers are exploring alternative methods to reduce the environmental impact of cooling and heating systems. Renewable energy technologies, including seawater heat pumps, offer a viable solution. The ocean is a vast reservoir of renewable energy, with seawater acting as a natural thermal storage medium. Due to its high heat capacity, seawater can be efficiently used for both heating and cooling. In China’s coastal regions, where winter temperatures remain above freezing, seawater heat pumps can replace traditional heating systems. Similarly, in summer, seawater at around 20–30°C serves as an effective cooling source. This not only reduces reliance on fossil fuels but also conserves fresh water, making it a valuable technology for China’s energy transition. **2. Seawater Heat Pump System** A seawater heat pump is an energy-efficient device that transfers heat from low-temperature sources (such as seawater) to high-temperature applications (like space heating). Unlike conventional systems that rely on boilers or chillers, heat pumps use a small amount of electricity to move large amounts of heat, improving overall efficiency. In summer, seawater acts as a coolant, reducing the need for cooling towers and increasing the coefficient of performance (COP) of air conditioning units. In winter, the system extracts heat from seawater and distributes it for heating. This dual functionality makes seawater heat pumps a highly efficient and environmentally friendly option for district heating and cooling. The system typically includes a seawater intake and discharge system, a heat pump unit, a heat exchanger, and a distribution network. By directly utilizing seawater as a heat source, these systems can replace traditional boilers and freezers, reducing energy consumption and environmental impact. **3. Introduction of the Seawater Heat Pump System in Stockholm** Stockholm, Sweden, has been a pioneer in the use of seawater heat pump systems for district heating and cooling. Since the 1960s, the city has integrated heat pumps into its energy infrastructure, leveraging its abundant coastal resources. Today, over 180 large-scale heat pumps operate across northern Europe, with Sweden playing a leading role. In Stockholm, approximately 60% of the population uses district heating, with a mix of energy sources including fossil fuels, biofuels, wastewater, and seawater. About 50% of the district heating is supplied by heat pump systems, while the remaining is supported by oil and electric boilers. The city’s district heating network covers over 20 million square meters, with pipelines stretching more than 765 kilometers. Seawater plays a key role in the system, with heat pumps extracting thermal energy from the sea and distributing it through a well-developed pipeline network. This approach not only reduces carbon emissions but also enhances energy efficiency and sustainability. **4. Prospects for Application in China** Given its extensive coastline and favorable climatic conditions, China has great potential for adopting seawater heat pump systems. These systems can significantly reduce energy consumption and environmental impact, especially in coastal cities. With proper investment and policy support, the technology could play a crucial role in China’s transition to a greener and more sustainable energy future.

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