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Conventional and advanced district energy systems

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Investment Planning Methodology for Complex Urban Energy Systems Applied to a Hospital Site

François Maréchal, Luc Girardin, Jean-Loup Sylvain Robineau, Francesca Belfiore, Bastien Maxence Bornand

Industrial process integration based on mixed integer linear programming has been used for decades to design and improve industrial processes. The technique has later been extended to solve multi-period and multi-scale problems for the design of urban ener ...

2020

District scale prediction of subsurface waste heat flows

Due to increasing urbanization and scarcity of land, the need to include the underground in urban planning is growing, especially in cities. The human-made underground structures generate an anthropogenic heat flow which has a significant impact on the gro ...

2020

Quantifying the technical geothermal potential from shallow borehole heat exchangers at regional scale

Jean-Louis Scartezzini, Nahid Mohajeri Pour Rayeni, Alina Ursula Rosa Walch

The extraction of shallow geothermal energy using borehole heat exchangers (BHEs) is a promising approach for decarbonisation of the heating sector. However, a dense deployment of BHEs may lead to thermal interference between neighboring boreholes and ther ...

2020

System design of a geothermal sourced CO2 network in a residential district

Tobia Wyss

Many countries and cities in the world have pledged to drastically reduce their CO2 emissions during the next decades. Given the high degree of urbanization in occidental society, district energy systems present a high potential to increase the efficiency ...

2019

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Evaporative cooling systems consume high water, but low electricity for their operation. On the other hand, vapor compression systems consume no water, but high electricity. Water and energy systems are interconnected at different levels. Therefore, water ...

2019

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We compare simulated energy retrofitting of individual buildings with energy refurbishments optimized at the scale of the neighborhood. For the neighborhood case, buildings can also be connected together through a heat network. We use a detailed three-dime ...

IOP Publishing Ltd2019

Solar thermal and geothermal integration with low temperature CO 2 DENs

François Maréchal, Luc Girardin, Raluca-Ancuta Suciu

Taking into account the high efficiency of solar thermal collectors and the fact that heating demands represent around 80% of the total energy needs in residential buildings, it is of interest to integrate solar thermal systems to supply HVAC services. How ...

Elsevier2018

District heating and cooling energy network using CO2 as a heat and mass transfer fluid

François Maréchal, Daniel Favrat, Luc Girardin, Samuel Henchoz

The 5th generation compact district heating and cooling networks in a temperature range of 10 to 16 °C have a great potential for energy savings by providing a heat source for decentralized heating heat pumps, a cold source for air-conditioning and a heat ...

2018

Geothermal energy is heat energy generated and stored in the Earth. With the awareness of the society about environmental issues, geothermal power is developing worldwide. It is cost-effective, reliable, sustainable, and environmentally friendly but has hi ...

2018

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The sector of transportation accounts for about one third of the total energy consumption in Switzerland. A monitoring campaign of the energy consumption of a regional train revealed the critical energy-consuming systems. Heating, cooling and ventilation w ...

2018