• Energy Research

Trends for heating energy in European Cities are the decarbonization of energy sources and the reduction of heat loads. District heating (DH) networks are key systems to reach the targets due to the cost competitiveness and high performance levels they show. However, DH networks require a conversion to adapt for the need of the future. It is necessary to reduce the operation temperature so that it is possible to increase the performance of renewable systems and operation criteria needs to be adopted for the introduction of weather-dependent, distributed heat sources such as solar systems. In this paper is presented the RELaTED, a novel DH networks scheme with decentralized Ultra-Low Temperature performance. This way, it is possible the adaptation of new and existing networks to several operational schemes. Transitory phases for the conversion of actual DH and how this affects the whole system are discussed along the paper.

Trends for heating energy in European Cities are the decarbonization of energy sources and the reduction of heat loads. District heating (DH) networks are key systems to reach the targets due to the cost competitiveness and high performance levels they show. However, DH networks require a conversion to adapt for the need of the future. It is necessary to reduce the operation temperature so that it is possible to increase the performance of renewable systems and operation criteria needs to be adopted for the introduction of weather-dependent, distributed heat sources such as solar systems. In this paper is presented the RELaTED, a novel DH networks scheme with decentralized Ultra-Low Temperature performance. This way, it is possible the adaptation of new and existing networks to several operational schemes. Transitory phases for the conversion of actual DH and how this affects the whole system are discussed along the paper.

Advanced Research Projects Agency-Energy project sheet summarizing general information about the 15 projects that are a part of the High Energy Advanced Thermal Storage (HEATS) program including project goals, innovation needs, and potential impacts.

The file contains codes and data to help interested readers to reproduce this work and to used for other developed application

This chapter introduces the role of thermal energy storage (TES) systems in enhancing building energy flexibility and demand-side management. Different forms of TES and their related storage media and materials were reviewed and the link between TES systems and energy flexibility was discussed. The role of TES systems in building energy flexibility and demand-side management was then addressed in terms of long-term (seasonal) and short-term storage applications. Different TES materials or media, such as sensible heat storage by water tanks, aquifers, and latent heat storage by various phase change materials can be considered. Furthermore, different techniques that can be utilized to manage the demand with the aid of TES systems are discussed. Different approaches, such as model predictive control as one of the most prominent ones, can be considered to maximize the benefit of TES in demand-side management, and hence energy flexibility.

Aircraft engine is one of the most complex systems demanding efficient monitoring for safe operation and timely maintenance of the aircraft. A survey of the aircraft engine health monitoring / management (EHM) systems available in the literature is presented in this report. Attempt has been made to identify distinct systems and methodologies available at present for the aircraft engines. This will provide a good basis towards the engine health monitoring research initiated at NAL under a NPMASS sponsored project. Detailed review of gas turbine engine health management systems and related literatures has been presented. Attempt has been made to understand future requirements of the advance sensors for intelligent aero engine from EHM perspective.

Please refer to "Ma Q, Wang P, Fan J and Klar A. Underground solar energy storage via energy piles: an experimental study. 2021." for details.

Sweden is only utilizing half of the available excess heat. To utilize more of the excess heat a seasonal thermal energy storage could be implemented to store excessed heat from the summer when the demand is lower to the winter when the demand is higher. This can be achieved by an integration of a seasonal thermal energy storage to the district heating system. A seasonal thermal energy storage may also reduce the need of the system’s peak load, which often is economically costly and adversely affect the environment. The purpose of the paper is to investigate the possibility for Skövde Värmeverk to implement a seasonal thermal storage. The paper is performed by a literature collection and calculations are made by software programs. The result shows that it is technically possible to implement a pit thermal energy storage and a borhole thermal energy storage, but no outcome shows a profitability within 20 years. A pit thermal energy storage can replace the system’s peak load up to 79 percent and a borhole thermal energy storage up to 2,8 percent. The most suitable case for Skövde Värmeverk is to install a pit thermal energy storage with a storage capacity of 4 GWh.