Simulation Research on the Hydraulic and Thermal Operation for Complex District Heating System

2015 ◽  
Vol 789-790 ◽  
pp. 411-415
Author(s):  
Zhi Gang Zhou ◽  
Peng Wang
Keyword(s):  
Mathematical Model ◽  
District Heating ◽  
Heating System ◽  
Simulation Software ◽  
Hydraulic Calculation ◽  
District Heating System ◽  
Simulation Research ◽  
Thermal Operation ◽  
The Mathematical Model ◽  
Calculation Analysis

In recent years, complex district heating systems will become the main style in most of big cities of china. How to simulate the hydraulic and thermal operation becomes more and more import. In this paper, the simulation mathematical model and method on the hydraulic and thermal operation for complex district heating system is proposed. By using the optimal of economical operation efficiency of the heating networks as the objective function and thermal balance as boundary conditions, the mathematical model is established. Meanwhile, the simulation software of hydraulic and thermal operation for complex district heating system has been developed. Functions of software involve information compilation, hydraulic calculation analysis, source thermal operation calculation, etc.

scholarly journals District heating system simulation considering consumer and pump operation features

Vestnik MGSU ◽  
2019 ◽  
pp. 748-755 ◽  
Author(s):  
Saule K. Abildinova ◽  
Stanislav V. Chicherin
Keyword(s):  
Mathematical Model ◽  
Energy Consumption ◽  
District Heating ◽  
Heating System ◽  
Hot Water ◽  
Water Supply Systems ◽  
Problem Solution ◽  
District Heating System ◽  
Pump Station ◽  
Pump Equipment

Introduction. The purpose of this investigation is to show what changes introduced in the mathematical model of a district heating system are capable of considerable improving the convergence of simulation results and actual data. The study evaluates the work of heating supply establishments with their customers as well as analysis of the ways of enhancing pump equipment efficiency that allows saving electric energy or increasing output at the same energy consumption. Materials and methods. Engineering acceptance of newly introduced and reconstructed facilities is conducted, heat loads are corrected, disconnections and recurrent connections of indebted consumers are carried out. Studying data submitted by a local heat supply establishment shows that pump seals made from iron and steel are subject accelerated wear in the course of operation. Results. Three variants of the problem solution are suggested: making seals from bronze or stainless steel, prevention of unjustified increase of seal clearances as well as using labyrinth pump seals. This will allow increasing pump equipment efficiency by 5 to 7 % and save about 2 × 105 kW∙h of electrical energy for every pump or increase of output at the same energy consumption. Taking into account that a pump station is a part of the district heating system and unmachined inner surfaces of the pumps have a significant roughness, grinding of these surfaces can improve their hydraulic characteristics of the pumps. In the scope of the suggested method, the entire district heating system is considered not in the situation when actual load is equal to the sum of all the design loads and the pump equipment has manufacturer’s parameters, but accounting actual loads and characteristics. Conclusions. Mathematical model of district heating system heating and hydraulic mode that takes issues mentioned above into consideration would allow simulating joint operation of the heating and hot water supply systems at transient operation modes with higher accuracy.

scholarly journals The Simulation Research on Primary District Heating Fluid Network

2018 ◽  
Vol 246 ◽  
pp. 02045
Author(s):  
Nan Cheng ◽  
Zhong Liu ◽  
Hongmei Zhang ◽  
Lin Xing ◽  
Zheng Zhang
Keyword(s):  
Rational Design ◽  
District Heating ◽  
Heating System ◽  
Vital Role ◽  
Simulation Research ◽  
Fluid Network ◽  
Large Hysteresis ◽  
Primary Fluid ◽  
Simulation Based ◽  
The Mathematical Model

According to the characteristics of multi-input, multi-output, multi-loop, non-linear and large hysteresis of fluid network, the mathematical model of node, regulating valve and pipeline are established respectively. Simulation based on Panysimu platform is carried out in this paper, and the influence of various disturbances on the entire primary fluid network is analyzed. The simulation results show that the circulation capability of the primary heating fluid network plays a vital role in the rational design of the whole heating system and the safe and economic operation.

scholarly journals THE COMPLEX APPROACH TO THE MODERNIZATION OF BOILERS, HEAT NETWORKS AND CONNECTED BUILDINGS

2019 ◽  
pp. 16-23
Author(s):  
Ye.Ye. Nikitin ◽  
O.V. Dutka
Keyword(s):  
Energy Efficient ◽  
District Heating ◽  
Feasibility Studies ◽  
Heating System ◽  
District Heating System ◽  
Heating Systems ◽  
Heat Networks ◽  
Complex Approach ◽  
The Mathematical Model ◽  
Calculated Analysis

The mathematical model that allows for a comparative analysis of the technical and economic characteristics of the three scenarios of the thermal modernization district heating system: the replacement of boilers, heat networks and pumps, the replacement of these elements in combination with thermal modernization of buildings, as well as a scenario that includes the implementation of all previous measures and the installation of Individual Heat Points in buildings (complex modernization). The advantages of the complex modernization on the horizon of planning for 50 years have been shown. Calculated analysis of the influence of various factors on the preference for this scenario has been carried out. The developed model can be used for the preparation of feasibility studies of projects energy efficient modernization of district heating systems and buildings. Bibl. 5, Fig. 8, Tab. 2.

scholarly journals Technology Pathways and Economic Analysis for Transforming High Temperature to Low Temperature District Heating Systems

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3218
Author(s):  
Pedro Durán ◽  
Herena Torio ◽  
Patrik Schönfeldt ◽  
Peter Klement ◽  
Benedikt Hanke ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Renewable Energy ◽  
High Temperature ◽  
Low Temperature ◽  
Economic Analysis ◽  
District Heating ◽  
Heating System ◽  
District Heating System ◽  
Heating Systems ◽  
District Heating Systems

There are 1454 district heating systems in Germany. Most of them are fossil based and with high temperature levels, which is neither efficient nor sustainable and needs to be changed for reaching the 2050 climate goals. In this paper, we present a case study for transforming a high to low temperature district heating system which is more suitable for renewable energy supply. With the Carnot Toolbox, a dynamic model of a potential district heating system is simulated and then transformed to a low temperature supply. A sensitivity analysis is carried out to see the system performance in case space constrains restrict the transformation. Finally, an economic comparison is performed. Results show that it is technically possible to perform the transformation until a very low temperature system. The use of decentralized renewable sources, decentralized heat storage tanks and the placement of a heat pump on each building are the key points to achieve the transformation. Regarding the sensitivity analysis, the transformation is worth doing until the seasonal storage and solar collector field sizes are reduced to 60% and 80% of their values in the reference case, respectively. The economic analysis shows, however, that it is hard for highly efficient low temperature renewable based heat networks to compete with district heating systems based on a centralized fossile CHP solution. Thus, though the presented transformation is technically possible, there is a strong need to change existing economic schemes and policies for fostering a stronger promotion of renewable energy policies in the heat sector.

Predicting Hourly Heating Load in a District Heating System Based on a Hybrid CNN-LSTM Model

2021 ◽  
pp. 110998
Author(s):  
Jiancai Song ◽  
Liyi Zhang ◽  
Guixiang Xue ◽  
YunPeng Ma ◽  
Shan Gao ◽  
...  
Keyword(s):  
District Heating ◽  
Heating System ◽  
District Heating System ◽  
Heating Load

scholarly journals Upgrading a District Heating System by Means of the Integration of Modular Heat Pumps, Geothermal Waters, and PVs for Resilient and Sustainable Urban Energy

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2347
Author(s):  
Elżbieta Hałaj ◽  
Jarosław Kotyza ◽  
Marek Hajto ◽  
Grzegorz Pełka ◽  
Wojciech Luboń ◽  
...  
Keyword(s):  
District Heating ◽  
Heating System ◽  
Upper Jurassic ◽  
Heat Pumps ◽  
Water Levels ◽  
Energy Potential ◽  
Geothermal Waters ◽  
District Heating System ◽  
Heating And Cooling ◽  
The City

Krakow has an extensive district heating network, which is approximately 900 km long. It is the second largest city in terms of the number of inhabitants in Poland, resulting in a high demand for energy—for both heating and cooling. The district heating of the city is based on coal. The paper presents the conception of using the available renewable sources to integrate them into the city’s heating system, increasing the flexibility of the system and its decentralization. An innovative solution of the use of hybrid, modular heat pumps with power dependent on the needs of customers in a given location and combining them with geothermal waters and photovoltaics is presented. The potential of deep geothermal waters is based on two reservoirs built of carbonate rocks, namely Devonian and Upper Jurassic, which mainly consist of dolomite and limestone. The theoretical potential of water intake equal to the nominal heating capacity of a geothermal installation is estimated at 3.3 and 2.0 MW, respectively. Shallow geothermal energy potential varies within the city, reflecting the complex geological structure of the city. Apart from typical borehole heat exchangers (BHEs), the shallower water levels may represent a significant potential source for both heating and cooling by means of water heat pumps. For the heating network, it has been proposed to use modular heat pumps with hybrid sources, which will allow for the flexible development of the network in places previously unavailable or unprofitable. In the case of balancing production and demand, a photovoltaic installation can be an effective and sufficient source of electricity that will cover the annual electricity demand generated by the heat pump installation, when it is used for both heating and cooling. The alternating demand of facilities for heating and cooling energy, caused by changes in the seasons, suggests potential for using seasonal cold and heat storage.

Sign in / Sign up

Export Citation Format

Share Document