Excess heat supply collaborations within the district heating sector: Drivers and barriers

In power transformers, energy losses in the form of heat are about 2 percent of their rated power, and in transformers of large power centers reach hundreds of kilowatts. Heat is dissipated into the environment and heats the street air. Therefore, there is a need to consume this thermal energy as a source of heat supply to nearby facilities. (Research purpose) To develop methods and means of using excess heat of power transformers with improvement of their cooling system design. (Materials and methods) The authors applied following methods: analysis, synthesis, comparison, monographic, mathematical and others. They analyzed various methods for consuming excess heat from power transformers. They identified suitable heat supply sources among power transformers and potential heat consumers. The authors studied the reasons for the formation of excess heat in power transformers and found ways to conserve this heat to increase the efficiency of its selection. (Results and discussion) The authors developed an improved power transformer cooling system design to combine the functions of voltage transformation and electric heating. They conducted experiments to verify the effectiveness of decisions made. A feasibility study was carried out on the implementation of the developed system using the example of the TMG-1000/10/0.4 power transformer. (Conclusions) The authors got a new way to use the excess heat of power transformers to heat the AIC facilities. It was determined that the improved design of the power transformer and its cooling system using the developed solutions made it possible to maximize the amount of heat taken off without quality loss of voltage transformation.

Download Full-text

Wastewater Treatment Plants as Local Thermal Power Stations—Modifying Internal Heat Supply for Covering External Heat Demand

Processes ◽

10.3390/pr9111981 ◽

2021 ◽

Vol 9 (11) ◽

pp. 1981

Author(s):

Florian Kretschmer ◽

Bernd Hrdy ◽

Georg Neugebauer ◽

Gernot Stoeglehner

Keyword(s):

Wastewater Treatment ◽

High Temperature ◽

Low Temperature ◽

Feasibility Study ◽

Heat Recovery ◽

Heat Supply ◽

Wastewater Treatment Plants ◽

Internal Heat ◽

District Heating ◽

Gas Combustion

To counteract climate change, the application of renewable energy sources and their efficient use are of crucial importance. In this context, wastewater has also gained increased attention in recent years. For decades, wastewater treatment plants have applied the heat from digester gas combustion to supply internal demands. However, in the context of efficient energy use the question arises: can using high temperature heat for supplying low temperature demand still be considered the best option? This article presents an innovative approach to covering wastewater treatment plant (WWTP) internal demand with low temperature wastewater heat recovery, making thermal energy from digester gas combustion available for feed-in to a local high temperature district heating network. The presented feasibility study was carried out in an Austrian municipality and investigates the heat balance, the economic risk, climatic benefits and the social aspects of the suggested approach. The practical implementation of the novel approach was planned in two steps. First, the WWTP should be connected to the district heating network to enable the feed-in of excess heat. Second, the WWTP internal heat supply should be modified and based on wastewater heat recovery from the effluent. Due to the promising results of the feasibility study, the first step was realized in summer 2020. The second and final step was initiated in 2021.

Download Full-text

Technological Innovation in the Aspect of Safety in the Process of Heat Supply

System Safety Human - Technical Facility - Environment ◽

10.2478/czoto-2019-0053 ◽

2019 ◽

Vol 1 (1) ◽

pp. 412-418

Author(s):

Aleksandra Wrzalik ◽

Matevž Obrecht

Keyword(s):

Energy Efficiency ◽

Heat Supply ◽

Renewable Energy Sources ◽

District Heating ◽

High Energy ◽

The European Union ◽

Heating Systems ◽

Operation Conditions ◽

Network Operation ◽

The Impact

AbstractIn recent years heating in Poland has been transformed as a result of the priorities of the country's energy policy implemented within the European Union. The increase in energy security, the development of renewable energy sources and the fulfilment of legal and environmental requirements are very important. Exploitation of district heating systems should ensure reliable and safe heat supplies for industrial and municipal customers with high energy efficiency and reduction of environmental impact. The article discusses the conditions and directions of centralized heating systems development as well as technical and economic issues, which are important for the security of heat supply. The Author describes selected technological innovations used in the technical infrastructure for heat transfer and modern IT systems which are improving the management of heating systems. The article includes the results of simulation research with use of IT tools showing the impact of selected innovations on the improvement of network operation conditions. Directions of modernization of heating systems in the aspect of increasing energy efficiency and security of heat supply have also been indicted here.

Download Full-text

Management of modernization of heat supply system of the region in the context of its sustainable development

Herald of Ternopil National Economic University ◽

10.35774/visnyk2020.03.020 ◽

2020 ◽

pp. 20-36

Author(s):

Tetiana Zheliuk

Keyword(s):

Energy Efficiency ◽

Sustainable Development ◽

Heat Supply ◽

District Heating ◽

Heat Supply System ◽

Heating System ◽

Energy Sector ◽

Supply System ◽

District Heating System ◽

The Sustainable Development

Introduction. One of the main directions of ensuring the sustainable development of the national economy and its regions is the reform of the energy sector, which can take place through the modernization or innovation of its components. An important component of these reforms is to provide the population with the environmentally friendly and socially safe thermal energy. At the present stage of management, the heat supply is the most costly branch of public utilities, which is supplemented by the problems of the inefficient fuel balance structure; worn-out infrastructure and low energy efficiency. This highlights the need to study the management of modernization of the heat supply system in the region in view of the declared vectors of the long-term development. Object of research is the process of managing the modernization of the heat supply system in the region. Subject of the research is a set of scientific approaches and practical mechanisms of modernization of the heat supply system of the region in the context of ensuring its sustainable development. Objective. The conceptual foundations of modernization of the heat supply system of the region in the context of its sustainable development through the introduction of the innovative technologies both in the management process and in the energy sector itself is substantiated in the paper. Methods. The following general scientific methods were used during the research process: system, structural analysis, grouping, when studying the structural elements and isolation of problems of development of the heat supply system of the region; historical analysis, when considering the scientific principles and institutional mechanism of modernization of the region’s heat supply system; comparative analysis in assessing the possibilities of the green transition of the heat supply system of the region and also when considering the features of the use of grant resources in the modernization of the heat supply system of the region; economic analysis in assessing the current state of the district heating system, etc. results. The essential determinants of the heat supply system of the region are analyzed, the objective need, organizational and economic mechanisms for managing the modernization of the heat supply, taking into account the need for the balanced development of the energy sector of the region are verified. The scientific novelty of the obtained results lies in the substantiation of the conceptual approaches to the management of modernization of the heat supply system of the region by innovating the forms and methods of managerial influence on the heat supply system of the region. The conclusion is made about the following effective approaches in managing the modernization of the district heating system: planning of the sustainable development of the energy sector, development of programs for modernization of the district heating, implementation of the infrastructure and soft projects, implementation of the international projects, motivation of households and entrepreneurship in the heat sector, participation in the grant requests, in state crediting programs, realization of the business projects in the field of production of environmentally friendly fuel; conducting an information campaign among the population and other key market players to raise the awareness of the energy efficiency financing mechanisms. The practical significance of the obtained results is that the developed recommendations will be used to improve the organizational and economic mechanism of management of the district heating system modernization and ensure its sustainable development.

Download Full-text

Selected aspects of technological innovations management in district heating companies

MATEC Web of Conferences ◽

10.1051/matecconf/201818304003 ◽

2018 ◽

Vol 183 ◽

pp. 04003 ◽

Cited By ~ 3

Author(s):

Aleksandra Rak

Keyword(s):

Energy Efficiency ◽

Heat Production ◽

Environmental Conditions ◽

Heat Supply ◽

District Heating ◽

Technological Innovations ◽

Heat Sources ◽

Product Innovations ◽

Eu Directives ◽

The Eu

The accession of Poland to the EU results in the realization of EU directives, including the field of energy efficiency and CO2 emissions. The regulations oblige enterprises that produce and distribute heat to technical activities involving the use of existing heat sources and modernization of thermal networks, as well as economic and environmental optimization of the heat supply process. The implementation of these projects requires a change in the way the energy sector is managed and thoroughly restructured by implementing and applying technological and product innovations. The article discusses the legal and environmental conditions of the heat market in Poland, the key challenges for the heating industry and selected innovations in heating companies regarding two areas: technical infrastructure and management of the heat production and transmission.

Download Full-text

The use of heat from the CO2 compression system for production of system heat

E3S Web of Conferences ◽

10.1051/e3sconf/20184900135 ◽

2018 ◽

Vol 49 ◽

pp. 00135

Author(s):

Robert Zarzycki

Keyword(s):

Power Systems ◽

Heat Supply ◽

Waste Heat ◽

Underground Storage ◽

Heat Power ◽

Cooling Process ◽

Heat Accumulator ◽

Excess Heat ◽

Compression System ◽

Gas Cooling

The study presents the concept and computations of the CO2 compression for the purposes of transport and underground storage of the gas. Cooling between individual stages is needed to reduce the power needed for CO2 compression. Heat obtained from the cooling process can be used to provide heat to the municipal heat power systems. A design of a heat accumulator for storage of excess heat was proposed in order to improve heat supply safety. The solution proposed in the study allows for heating condensing power units using waste heat from the CO2 cooling process.

Download Full-text

Design and Analysis of District Heating Systems Utilizing Excess Heat in Japan

Energies ◽

10.3390/en12071202 ◽

2019 ◽

Vol 12 (7) ◽

pp. 1202 ◽

Cited By ~ 4

Author(s):

Shin Fujii ◽

Takaaki Furubayashi ◽

Toshihiko Nakata

Keyword(s):

Spatial Information ◽

Thermal Power ◽

District Heating ◽

European Countries ◽

Geographical Information ◽

Load Curve ◽

Heating Systems ◽

Excess Heat ◽

District Heating Systems ◽

Northern Japan

District heating systems (DHSs) which utilize excess heat play an important role in energy infrastructure in many European countries. In contrast to Europe, the DHS is not common and excess heat is not reused effectively in Japan. Almost all the DHSs in Japan were designed as first-generation district heating (1GDH) systems or 2GDH systems. No 4GDH systems have been introduced in Japan. The present study designs a 4GDH system utilizing excess heat from a wide area of Northern Japan and evaluates its feasibility. First, available heat amounts from two excess heat resources were calculated: waste incineration plants and thermal power plants. Second, heat demand from both residential and commercial sectors was estimated using a 1 km mesh, and a heat load curve was created for each mesh based on load curve data. Third, the DHS was designed with excess heat plants as a supply-side heat resource, and spatial information of the demand side made use of the geographical information system (GIS). Further analysis was conducted on selected DHSs in three cities in order to evaluate those systems’ feasibility based on energy efficiency, CO2 emissions, and economic aspects. The result shows that 70.5 PJ of heat can be supplied by DHS in Northern Japan, replacing imported fossil fuels such as petroleum and LPG with regional excess heat. The designed DHS could supply heat with equivalent costs compared to European countries.

Download Full-text