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Two-way heat exchanger system based on renewable energy


Two-way heat exchanger system based on renewable energy

Show base photo. Credit: Korea Institute of Civil Engineering and Construction Technology

Global energy trends are moving towards digitization, decarbonisation and decentralization. Global warming and pollution-induced climate anomalies appear in the daily news suggesting that the threats of climate change are not far off. According to a report released by the Intergovernmental Panel on Climate Change (IPCC), carbon emissions from urban areas in 2020 account for between 67% and 72% of total emissions. Globally, efforts are being made to reduce carbon emissions from urban areas and buildings through the provision of renewable energy and the construction of energy-free buildings.

A research team at the Building Energy Research Department of the Korea Institute of Building and Construction Technology (KICT, President Kim Byung-suk), has developed a two-way heat exchanger system using excess heat. from recycled energy include solar thermal energy in an effort to achieve carbon neutrality in buildings.

Solar thermal, geothermal and fuel cells are increasingly being used individually or in combination in hybrid systems to reduce the heating and cooling energy used in buildings. However, such systems have the potential to generate excess heat due to a mismatch between the heat needs of the building and the renewable-based heat supply. Excess heat, or waste heat, is heat that is not used after intermittent heat production.

For example, in spring in Korea when solar radiation is full, enough heat can be generated. However, this season does not require a high level of heating, thus resulting in partial heat loss. The team led by Researcher Yongki Kim has developed a system that helps transaction buildings excess heat two-way through heating pipes after self-consumption in high-density areas of buildings.

Two-way heat exchanger system based on renewable energy

Heat pipe network photo. Credit: Korea Institute of Civil Engineering and Construction Technology

The team configured a network of heating pipes for three of KICT’s buildings in Ilsan, South Korea, and used a range of fuel cells and solar and geothermal energy as heat sources. Two 944 m2 Solar collectors have been installed in the outdoor parking lot and on the roof, and a heat pump for a 310kWth geothermal heat source, a 10kWp fuel cell system and two 40 m heat storage facilities3 and 10 m3 capacity has been built.

Simulations and proof of concept have demonstrated that twin tubes are effective in low temperature heat pipe networks with heat loss of about 10%. When there is enough sunlight, hot water for heating is supplied with solar heat to the secondary pipe of the area heating system through a heat exchanger. When there is not enough sunlight, hot water can be supplied through the heat pump system of the geothermal source and the fuel cell system. The two-way heat exchanger system can be controlled manually and automatically at the integrated control center.

The renewable thermal energy applied to a building is usually for self-consumption. In a small-scale heating system, the supply and demand bases are separated and the heat is supplied unidirectionally. In this study, a two-way heat exchanger system was implemented, improving the utilization rate of the renewable heat source facilities and the efficiency of the system.

Two-way heat exchanger system based on renewable energy

The results of the daily thermodynamic test. Credit: Korea Institute of Civil Engineering and Construction Technology

“This system has the potential to increase the use of renewable thermal energy in cities and buildings, which will ultimately reduce it,” said Yongki Kim, who led the research team. carbon emissions.”

More information:
Muhammad Usman et al, Evaluation of pipeline insulation for heating deployment in low-temperature areas in Korea, Frontiers in energy research (2022). DOI: 10.3389/fenrg.2021.793557

Provided by the National Science & Technology Research Council

quote: Renewable Energy Based Bidirectional Heat Exchanger System (2023, 7 March) accessed 7 March 2023 from https://techxplore.com/news/2023-03-renewable-energy-based -bi-direction.html

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