scholarly journals Primary energy savings using heat storage for biomass heating systems

2012 ◽  
Vol 16 (suppl. 2) ◽  
pp. 423-431 ◽  
Author(s):  
Dejan Mitrovic ◽  
Jelena Janevski ◽  
Mirjana Lakovic
Keyword(s):  
Heat Load ◽  
Energy Savings ◽  
Heat Storage ◽  
District Heating ◽  
Primary Energy ◽  
Water Tank ◽  
Storage Unit ◽  
Heating Systems ◽  
Heating Efficiency ◽  
Storage Volume

District heating is an efficient way to provide heat to residential, tertiary and industrial users. The heat storage unit is an insulated water tank that absorbs surplus heat from the boiler. The stored heat in the heat storage unit makes it possible to heat even when the boiler is not working, thus increasing the heating efficiency. In order to save primary energy (fuel), the boiler operates on nominal load every time it is in operation (for the purpose of this research). The aim of this paper is to analyze the water temperature variation in the heat storage, depending on the heat load and the heat storage volume. Heat load is calculated for three reference days, with average daily temperatures from -5 to 5?C. The primary energy savings are also calculated for those days in the case of using heat storage in district heating.

scholarly journals Effects of implementation of co-generation in the district heating system of the Faculty of Mechanical Engineering in Nis

2010 ◽  
Vol 14 (suppl.) ◽  
pp. 41-51 ◽  
Author(s):  
Mladen Stojiljkovic ◽  
Mirko Stojiljkovic ◽  
Bratislav Blagojevic ◽  
Goran Vuckovic ◽  
Marko Ignjatovic
Keyword(s):  
Natural Gas ◽  
Energy Savings ◽  
Boiler House ◽  
District Heating ◽  
Electrical Energy ◽  
Heating System ◽  
Primary Energy ◽  
District Heating System ◽  
Heating Systems ◽  
District Heating Systems

Implementation of co-generation of thermal and electrical energy in district heating systems often results with higher overall energy efficiency of the systems, primary energy savings and environmental benefits. Financial results depend on number of parameters, some of which are very difficult to predict. After introduction of feed-in tariffs for generation of electrical energy in Serbia, better conditions for implementation of co-generation are created, although in district heating systems barriers are still present. In this paper, possibilities and effects of implementation of natural gas fired cogeneration engines are examined and presented for the boiler house that is a part of the district heating system owned and operated by the Faculty of Mechanical Engineering in Nis. At the moment, in this boiler house only thermal energy is produced. The boilers are natural gas fired and often operate in low part load regimes. The plant is working only during the heating season. For estimation of effects of implementation of co-generation, referent values are taken from literature or are based on the results of measurements performed on site. Results are presented in the form of primary energy savings and greenhouse gasses emission reduction potentials. Financial aspects are also considered and triangle of costs is shown.

scholarly journals Utilizing Sewage Wastewater Heat in District Heating Systems in Serbia - Effects on Sustainability

2021 ◽  
Author(s):  
Marija Živković ◽  
Dejan Ivezic
Keyword(s):  
Energy Source ◽  
Wastewater Treatment ◽  
Carbon Dioxide Emission ◽  
District Heating ◽  
Primary Energy ◽  
Energy Sources ◽  
Heating Systems ◽  
Current State ◽  
District Heating Systems ◽  
Treatment Facilities

Abstract Transformation of the heating sector is recognized as being essential for ensuring reliable and affordable energy services provided with reduced consumption of energy sources, diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused energy source in Serbia, while data about the potential of this energy source are lacking. This research proposes a methodology for the determination of the technical potential of waste heat from wastewater treatment facilities for use in district heating systems by heat pump application. Data from existing wastewater treatment facilities are used for providing data for replication in cities without wastewater treatment plants but with district heating systems. An estimation of the recoverable heat energy potential of wastewater is used for evaluation of some effects that could be obtained through its full utilization for heat production in the existing district heating systems. Three groups of indicators are selected for analysis focusing on district heating systems' energy performance (primary energy factor, specific heat consumption per degree day and heating area), the security of energy supply (import dependency, Shannon Wiener diversification index, the share of renewables) and environmental impact (carbon dioxide emission coefficient). Values of the selected indicators are determined for the current state of district heating systems and for the possible future state that could be achieved after full utilization of sewage wastewater potential. The proposed methodology is applied to Serbia, as a case study. It has been shown that all analyzed indicators for the projected future would have more preferable values compared to the values that correspond to the current state of the district heating systems. The use of this renewable energy source should provide primary energy savings of 5% per year, reduction of carbon dioxide emission of 6.5% per year, reduction of import dependency of DH systems of 9.8% and improved diversification of energy sources of 21%.

Developing and Monitoring a Sustainable Energy and Climate Action Plan for an Energy-Producing Community

2017 ◽  
pp. 101-124
Keyword(s):  
Energy Savings ◽  
Sustainable Energy ◽  
Action Plan ◽  
District Heating ◽  
Phase Iii ◽  
Heating Systems ◽  
Climate Action ◽  
Alternative Scenarios ◽  
Climate Action Plan ◽  
The City

The development, implementation and monitoring of the Sustainable Energy and Climate Action Plan require a significant amount of data and analysis, as well as an effective and comprehensive decision making process. This chapter presents the pilot application of the proposed “MPC+ (Map - Plan - Choose - Check)” framework, through the “Action3” Decision Support System, in a Greek energy-producing community. The pilot application is conducted in three phases, namely the development of the baseline emission inventory (Phase I), the creation and evaluation of alternative Scenarios of Actions (Phase II) and the monitoring of the actions and measures implemented (Phase III). The city's univocal economy orientation of energy production through lignite is considered as a basic, inhibitory factor towards sustainability. In this respect, the city has committed to implement a series of appropriate renewable energy and rational use of energy activities in its territory, laying balanced emphasis on the local energy and heat production, and the promotion and implementation of measures on energy savings. A significant part of the CO2 emissions' reduction will come from the installation of biomass district heating systems in local communities.

scholarly journals The effect of the District Heating Return Temperature Reduction on Flue Gas Condenser Efficiency

2020 ◽  
Vol 24 (3) ◽  
pp. 23-38
Author(s):  
Kertu Lepiksaar ◽  
Anna Volkova ◽  
Pavel Ruseljuk ◽  
Andres Siirde
Keyword(s):  
Flue Gas ◽  
Heat Recovery ◽  
Energy Savings ◽  
District Heating ◽  
Primary Energy ◽  
Calculation Model ◽  
Fuel Moisture ◽  
Temperature Reduction ◽  
Boiler Efficiency ◽  
Heating Networks

AbstractThe use of flue gas condensers proved to be effective in increasing boiler efficiency and achieving primary energy savings. The transition to the 4th generation district heating will lead to temperature reduction in district heating networks. The aim of this study is to determine the effects of the reduction in the district heating return temperature on flue gas condenser efficiency. Different DH return temperatures and fuel moisture contents were examined, and a calculation model was created. The results show that a reduction in district heating return temperature can lead to an increase in heat recovery through the flue gas condenser. Primary energy savings were estimated based on the amount of heat recovered.

scholarly journals Techno-economic analysis of implementing thermal storage for peak load shaving in a campus district heating system with waste heat from the data centre

2021 ◽  
Vol 246 ◽  
pp. 09003
Author(s):  
Haoran Li ◽  
Juan Hou ◽  
Yuemin Ding ◽  
Natasa Nord
Keyword(s):  
Waste Heat ◽  
Peak Load ◽  
District Heating ◽  
Thermal Storage ◽  
Heating System ◽  
Water Tank ◽  
District Heating System ◽  
Heating Systems ◽  
Heat Demand ◽  
District Heating Systems

Peak load has significant impacts on the economic and environmental performance of district heating systems. Future sustainable district heating systems will integrate thermal storages and renewables to shave their peak heat demand from traditional heat sources. This article analysed the techno-economic potential of implementing thermal storage for peak load shaving, especially for the district heating systems with waste heat recovery. A campus district heating system in Norway was chosen as the case study. The system takes advantage of the waste heat from the campus data centre. Currently, about 20% of the heating bill is paid for the peak load, and a mismatch between the available waste heat and heat demand was detected. The results showed that introducing water tank thermal storage brought significant effects on peak load shaving and waste heat recovery. Those effects saved up to 112 000 EUR heating bills annually, and the heating bill paid for the peak load could be reduced by 15%. Meanwhile, with the optimal sizing and operation, the payback period of the water tank could be decreased to 13 years. Findings from this study might help the heat users to evaluate the economic feasibility of introducing thermal storage.

scholarly journals APLICATION OF REGRESSION ANALYSIS IN FEASIBILITY STUDIES OF CONSUMER CONNECTION TO DISTRICT HEATING SYSTEMS

2021 ◽  
Vol XXVIII (4) ◽  
pp. 121-132
Author(s):  
Corina Chelmenciuc ◽  
◽  
Constantin Borosan ◽  
Vadim Lisnic ◽  
◽  
...  
Keyword(s):  
Regression Analysis ◽  
Urban Areas ◽  
District Heating ◽  
Feasibility Studies ◽  
Heating System ◽  
Primary Energy ◽  
Energy Resources ◽  
District Heating System ◽  
Heating Systems ◽  
District Heating Systems

Nowadays, both globally and in Europe, and nationally, there is a tendency to promote district heating systems to the detriment of individual ones to heat dwellings in urban areas. The need to develop the DHSs is indisputable considering the topicality of global warming, the depletion of the primary energy resources and the energy efficiency trend. This article presents the method of applying regression analysis in feasibility studies for the projects of new heat consumers connection to the district heating system (hereinafter – DHS) or previously disconnected consumers reconnection via individual heating points (hereinafter – IHP) when the necessary investments are to be borne by the DHS operator, and the thermal energy is produced in cogeneration. At the same time, it is demonstrated that there is a direct and linear correlation between fuel consumption and electricity and heat produced in cogeneration at CHP plant.

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