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In this paper, we mainly introduce a solar-thermal underfloor heating system with electrical heating, which consists of solar vacuum tube panel, finned tube heat exchanger, disturbed flow tank, underfloor heating pipe, temperature measuring point, circulating water pump and auxiliary electric heater. Compared with traditional equipment, this system separates underfloor circulating water and domestic water completely. What’s more, antifreeze is used to transfer solar energy to underfloor cycling water through a kind of more efficient heat exchanger--finned tube heat exchanger. So residents can not only get warm in winter, but also save more electrical energy. 1. Background In 2009 at the Copenhagen climate change conference, the ‘Low Carbon Economy’ was put on the agenda, which is a new economic model based on low energy consumption, low population and low emission. With the global climate becoming more and more warmer, it is commonly believed that the environmental resource destruction and fossil fuel utilization have been important factors restricting sustainable development. What’s more, economic and social development is also faced with a lot of serious challenges, such as environmental and resource problems. World Wild Fund (WWF), Climate Group and other international organizations are now making more plans to promote ‘low carbon city’ construction and development. Therefore, developing a low carbon city has been a new sense of development all around the world. 2. Introduction Compared with traditional solar energy equipment, this system which concludes antifreeze circulation and underfloor water circulation, separates underfloor circulating water and domestic water completely. To increase the contact area of cycling water and antifreeze, finned tube heat exchanger replaces traditional spiral tube heat exchanger, and the heat transfer efficiency is also higher. Hot cycling water then flows to the underfloor. There are temperature measuring points at the entrance of every room. When the temperature of water is below standard, electrical heating will be operated. In Beijing, for example, every resident can save 106.85 kg standard coal during the whole heating period. 3. Operation Principle Residents get heat from underfloor cycling water. When ethylene glycol antifreeze is heated to a certain temperature, it will be sent into the finned tube heat exchanger to heat cycling water. After the 50~60°C water is regulated to a fitted temperature by water mixers, it flows to every underfloor pipes of room with the help of pump. There are valves and temperature measuring points at the entrance of room, which can maintain temperature. When solar energy is insufficient or during the night, electrical heater will be operated. This system can maintain the room temperature between 10~ 20°C. 1020 5th International Conference on Frontiers of Manufacturing Science and Measuring Technology (FMSMT 2017) Advances in Engineering Research (AER), volume 130

Solar-thermal Underfloor Heating System with Electrical Heating Auxiliary