Key issues and solutions in a district heating system using low-grade industrial waste heat

Energy ◽  
2015 ◽  
Vol 86 ◽  
pp. 589-602 ◽  
Author(s):  
Hao Fang ◽  
Jianjun Xia ◽  
Yi Jiang
Keyword(s):  
Industrial Waste ◽  
Waste Heat ◽  
District Heating ◽  
Heating System ◽  
Low Grade ◽  
District Heating System ◽  
Key Issues ◽  
Industrial Waste Heat

scholarly journals Screening refrigerant for a new enhanced ejector heat exchanger used in district heating system based on industrial waste heat

2021 ◽  
Vol 260 ◽  
pp. 01002
Author(s):  
Fangtian Sun ◽  
Baoru Hao ◽  
Xu Chen
Keyword(s):  
Heat Exchanger ◽  
Industrial Waste ◽  
Waste Heat ◽  
District Heating ◽  
Physical Property ◽  
Heating System ◽  
Space Heating ◽  
District Heating System ◽  
Thermodynamic Performance ◽  
Industrial Waste Heat

Performance of the new enhanced ejector heat exchanger is the key to improving performance of the district heating system based on industrial waste heat, and it is significantly affected by thermo-physical property of refrigerant. In this paper, characteristics of the new enhanced ejector heat exchanger are considered, and a new principle for screening refrigerant is proposed. Eleven kinds of refrigerants are firstly selected as candidates, and then they are evaluated from the perspective of property and thermodynamic performance of the new enhanced ejector heat exchanger. The results show that refrigerant property has a greater influence on thermodynamic performance of the new enhanced ejector heat exchanger. Under the condition of low temperature space heating, R152a and R1234yf are favorable choices for the new enhanced ejector heat exchanger. While under conditions of other temperature space heating, R245fa and R600 are better choices for the new enhanced ejector heat exchanger.

Feasibility limits of using low-grade industrial waste heat in symbiotic district heating and cooling networks

2020 ◽  
Vol 22 (6) ◽  
pp. 1339-1357 ◽  
Author(s):  
Maurizio Santin ◽  
Damiana Chinese ◽  
Alessandra De Angelis ◽  
Markus Biberacher
Keyword(s):  
Industrial Waste ◽  
Waste Heat ◽  
District Heating ◽  
Low Grade ◽  
Heating And Cooling ◽  
Industrial Waste Heat

scholarly journals A Framework for Design and Operation Optimization for Utilizing Low-Grade Industrial Waste Heat in District Heating and Cooling

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2190
Author(s):  
Lingwei Zhang ◽  
Yufei Wang ◽  
Xiao Feng
Keyword(s):  
Industrial Waste ◽  
Energy Demand ◽  
Heat Recovery ◽  
Waste Heat ◽  
District Heating ◽  
Mixed Integer ◽  
Low Grade ◽  
Operation Optimization ◽  
Heating And Cooling ◽  
Industrial Waste Heat

In the process industry, a large amount of low-grade waste heat is discharged into the environment. Furthermore, district heating and cooling systems require considerable low-grade energy. The integration of the two systems has great significance for energy saving. Because the energy demand of consumers varies in periods, the design and operation of an industrial waste heat recovery system need to match with the fluctuations of district energy demand. However, the impact of the periodic changes on the integration schemes are not considered enough in existing research. In this study, a framework method for solving above problem is proposed. Industrial waste heat was integrated with a district heating and cooling system through a heat recovery loop. A three-step mathematical programming method was used in design and operation optimization for multiperiod integration. A case study was conducted, and the results show that the multiperiod optimization method can bring significant benefits to the system. By solving the mixed integer nonlinear programming model, the optimal operation plans of the integration in different periods can be obtained.

scholarly journals Novel District Heating Systems: Methods and Simulation Results

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4450
Author(s):  
David Huber ◽  
Viktoria Illyés ◽  
Veronika Turewicz ◽  
Gregor Götzl ◽  
Andreas Hammer ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Industrial Waste ◽  
Waste Heat ◽  
District Heating ◽  
Hot Water ◽  
Space Heating ◽  
Low Grade ◽  
Domestic Hot Water ◽  
Heating And Cooling ◽  
Industrial Waste Heat

Fifth-generation district heating and cooling (5th DHC) systems offer promising approaches to decarbonizing space heating, cooling and domestic hot water supply. By using these systems, clustered buildings combined with industrial waste heat can achieve a net-zero energy balance on a variety of time scales. Thanks to the low exergy approach, these systems are highly efficient. As part of the Smart Anergy Quarter Baden (SANBA) project, the thermal energy grid simulation tool TEGSim has been further developed and used to design an ultra-low-temperature district heating (ULTDH) network with hydraulic and thermal components fitted to the specific regional characteristics of the investigated case. Borehole thermal energy storage (BTES) used as seasonal storage ensures long-term feasibility. The annual discrepancy of input of thermal energy provided by space cooling and output of energy demanded by space heating and domestic hot water is supplied by an external low-grade industrial waste heat source. This paper presents the functionality of the simulation and shows how to interpret the findings concerning the design of all components and their interplay, energy consumption and efficiencies.

scholarly journals Possibilities of Using Industrial Waste Heat for Heating Greenhouses in Northern Greece

2018 ◽  
Vol 10 (4) ◽  
pp. 116 ◽  
Author(s):  
John Vourdoubas
Keyword(s):  
Industrial Waste ◽  
Heat Recovery ◽  
Power Plants ◽  
Waste Heat ◽  
District Heating ◽  
Economic Benefits ◽  
Hot Water ◽  
Northern Greece ◽  
District Heating System ◽  
Industrial Waste Heat

The possibility of using the rejected heat from lignite-fired power plants for heating greenhouses in northern Greece has been examined. Although currently industrial waste heat is used for district heating in a few towns in Greece, its use in agriculture has not been reported so far. Due to many environmental and economic benefits symbiosis of industrial and agricultural activities is promoted in many countries. Greenhouses in northern Greece utilize mainly natural gas as heating fuel. However heat recovery from the existing power plants and its use in greenhouses could increase their energy efficiency and reduce the thermal pollution. It will also decrease the use of fossil fuels in greenhouses and the resulting carbon emissions as well. Their heating requirements have been estimated at 170 W/m2 and the required hot water temperatures are 50-60 oC below the required water temperature in district heating systems, at 120 oC. Currently the price of heat sold in the district heating system in the town of Kozani is 0.0435 €/KWh, which is very attractive for heating greenhouses compared with other existing methods or fuels. It has been estimated that the heat recovery from the power plants at 70 MWth could cover the heating needs of 41.2 ha of modern agricultural greenhouses in northern Greece. Recycling of industrial waste heat in greenhouses in northern Greece, apart from the resulting environmental benefits, will offer a competitive advantage, increasing the profitability of those enterprises.

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