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Decomposition method to evaluate district heating/cooling network potential at urban scale

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The present relates to a sample holder comprising a single block (1) made of a thermally conductive material comprising at least two volumes, a reference volume (5) and a sample holding volume (4) directly machined in said single block (1), a heating means ...

2019

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

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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

Two-phase, refrigerant-based cooling offers significant promise for increasing heat densities and energy efficiencies of electronic components. One barrier to wide spread adoption of two-phase cooling solutions is preserving product features deemed essenti ...

IEEE2018

Cyclic Load – Transfer Approach for the Analysis of Energy Piles

Lyesse Laloui, Melis Sütman

Energy piles, due to their unique roles of coupling the structural support and heat exchange with the surrounding ground, are subject to temperature cycles during their lifetime. Although their behaviour during individual temperature increase or decrease h ...

2018

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Compact district energy 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 sink for refrigeration or cogener ...

2017

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Given the challenges related to climate change and dependency from fossil fuels, modification of the energy systems infrastructure to increase the share of renewable energy is a priority in urban energy planning. The high heating density in cities makes it ...

2017

Two-phase operational maps, pressure drop, and heat transfer for flow boiling of R236fa in a micro-pin fin evaporator

John Richard Thome, Navid Borhani, Mirco Magnini, Chiara Falsetti, Hamideh Jafarpoorchekab

Cooling the new generation of 3D high power electronic chips is one of the leading challenges in microelectronics, as it is a key to achieve high computational performance at lower cooling system power consumption, thus reducing the operating cost. Two-pha ...

Pergamon-Elsevier Science Ltd2017

Key Energy and Technological Aspects of Three Innovative Concepts of District Energy Networks

François Maréchal, Daniel Favrat, Samuel Henchoz, Patrick Chatelan

Energy needs in urban areas are heterogeneous by their nature, spatial distribution and temperature level required. Three concepts of district energy networks that could provide the energy services efficiently to a city centre are compared. The focus is on ...

2016

Reducing primary energy consumption by utilizing heat recovery systems has become increasingly important in industry. In many sectors, heating and cooling is required at different temperature levels at the same time. For this purpose, heat pumps are highly ...

2016