Method for Redesign of District Heating Networks within Transition from the 2nd to the 3rd Generation

2014 ◽  
Vol 657 ◽  
pp. 689-693
Author(s):  
Răzvan Corneliu Lefter ◽  
Daniela Popescu ◽  
Alexandrina Untăroiu
Keyword(s):  
District Heating ◽  
Design Stage ◽  
Heating Systems ◽  
Load Duration ◽  
Load Duration Curve ◽  
District Heating Systems ◽  
Consumption Rates ◽  
Heat Loads ◽  
Heating Networks

Important investmentsare made lately in the area of district heating, as a technology capable ofhelping countries to reach sustainability goals. In Romania, European fundswere spent for transition from the 2nd to the 3rdgeneration of district heating systems. The lack of appropriate monitoringsystems in old district heating systems makes optimisation nowadays very difficult,especially because nominal values used in the first design stage areoverestimated. Realistic nominal heat loads are necessary to make goodestimations of hydraulic parameters to be used for redesign. This studyproposes a method that uses the heat load duration curve theory to identify theappropriate nominal heat loads to be used for redesign. Comparison betweenresults obtained by applying the nominal heat loads of each consumer, as theywere established in the first design stage, and the ones identified by theproposed method are analyzed in a case study. The results show that errors arein the +/- 3% band, between the metered heat consumption rates and the proposedrates. The new method can be used for the sizing of pumps and district heatingnetworks after retrofit, in order to get better adjustments of the circulationpumps and increase of the energy efficiency.

scholarly journals Hourly optimization and sizing of district heating systems considering building refurbishment – Case study for the city of Zagreb

Energy ◽  
2017 ◽  
Vol 137 ◽  
pp. 1264-1276 ◽  
Author(s):  
Matija Pavičević ◽  
Tomislav Novosel ◽  
Tomislav Pukšec ◽  
Neven Duić
Keyword(s):  
District Heating ◽  
Heating Systems ◽  
District Heating Systems ◽  
Building Refurbishment ◽  
The City

Solar energy use in district heating systems. A case study in Latvia

Energy ◽  
2017 ◽  
Vol 137 ◽  
pp. 586-594 ◽  
Author(s):  
Raimonda Soloha ◽  
Ieva Pakere ◽  
Dagnija Blumberga
Keyword(s):  
Solar Energy ◽  
Energy Use ◽  
District Heating ◽  
Heating Systems ◽  
District Heating Systems

scholarly journals Assessing high shares of renewable energies in district heating systems – a case study for the city of Herten

2017 ◽  
Vol 22 ◽  
pp. 00005
Author(s):  
Ali Aydemir ◽  
Eftim Popovski ◽  
Daniel Bellstädt ◽  
Tobias Fleiter ◽  
Richard Büchele
Keyword(s):  
District Heating ◽  
Renewable Energies ◽  
Heating Systems ◽  
District Heating Systems ◽  
The City

scholarly journals METHODS FOR CALCULATING NETWORK PARAMETERS IN REGULATING THE COMPLEX OF WORKS ON MODERNIZATION OF THE HEAT SUPPLY SECTOR

2020 ◽  
Author(s):  
Nadiia Yushchenko ◽  
Keyword(s):  
Heat Supply ◽  
Power Plants ◽  
Negative Impact ◽  
Critical Path ◽  
District Heating ◽  
Heat Energy ◽  
Heating Systems ◽  
Network Parameters ◽  
District Heating Systems ◽  
Heating Networks

In Ukraine, where, unlike the countries of the European Union that use district heating systems and have invested more than €80 billion in their modernization over the past 30 years, during 1990-2020 there was no necessary investment in the modernization of district heating systems, especially badly worn out heating systems combined heat and power plants and heating networks, losses of thermal energy in heat sources and networks are the largest in Europe, rational work is needed to further improve the technical level of heat supply systems based on innovative, highly efficient technologies and equipment; reduction of non-production losses of heat energy and fuel consumption; ensuring controllability, reliability, safety and efficiency of heat supply; reducing the negative impact on the environment. And in this case, the planning of works that are significant in terms of volume, cost and time becomes especially relevant to the use of economic and mathematical models and methods existing in the theory of planning and network management, such as the Critical Path Method, Program Evaluation and Review Technique, Graphical Evaluation and Review Technique, which involve working with networks, and related software like Project Standard, Open Plan, Primavera Project Planner, SureTrak Project Manager and others that will help generate invariants of management decisions regarding the sequencing and timing of use limited resources throughout the entire period of the project, dynamically adjust the timing of the start of each type of work, carry out the optimal distribution of funds allocated to the project in terms of reducing the duration of the entire project, analyze the trade-off relationships between p the costs and timing of various works, taking into account the available reserve of time, when it comes to a large number of interrelated works that must be performed in a strict technological sequence, require timing and control in order to achieve the task. The article is devoted to the systematization and review of such methods for calculating network parameters (network graphics) such as analytical, matrix, tabular and with the use of electronic computers (computers). The expediency of adapting them to the practice of effective planning and management of modernization, reconstruction and replacement of technological equipment of heat points and heating networks of heat power enterprises in order to reduce costs in the production, transmission and distribution of heat energy for the implementation of the Energy Strategy of Ukraine for the period up to 2035 is substantiated.

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