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

Zhang, Lingwei; Wang, Yufei; Feng, Xiao

doi:10.3390/en14082190

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…Compared with simpler measures, extensive changes are always associated with high (investment) cost and the corresponding high business/financial risk. Such changes might include the implementation of appropriate CHP plants, the redesign of production lines and/or procedures, the application of sophisticated prediction, simulation, and control techniques, and the connection of the facility to the local heating or cooling network to channel waste energy or heat [76,77].…”

Section: Measures Related To Process Design and Energy Supplymentioning

confidence: 99%

Energy Efficiency Management in Small and Medium-Sized Enterprises: Current Situation, Case Studies and Best Practices

Gennitsaris

Oliveira

Vris³

et al. 2023

Sustainability

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Energy efficiency is a key factor to meet the ambitious climate targets of the European Union (EU) aligned with the international policy directives. On their own, Small and Medium-sized Enterprises (SMEs) do not consume big amounts of energy, but taking into consideration that they represent about 99% of businesses worldwide, their cumulative energy consumption is remarkable. Even though SMEs experience several barriers in their effort to improve their energy efficiency, their contribution to the EU’s energy efficiency improvement targets is crucial through the implementation of measures to improve their energy footprint. The purpose of this paper is to present a comprehensive review of SMEs’ energy efficiency and energy footprint management, which has been carried out in the context of the “SMEnergy—Energy Footprint Management for SMEs” EU-funded Erasmus+ project. The correlation between energy conversion and consumption processes and energy efficiency, as well as the current situation of energy footprint management and energy management systems in SMEs, are discussed in detail. Moreover, successful case studies of SMEs that have implemented specific measures to improve their energy footprint and achieve energy efficiency targets are also included. It is highlighted that SMEs exhibit a high potential for energy efficiency enhancement that could directly promote climate change mitigation and sustainable development.

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Section: Measures Related To Process Design and Energy Supplymentioning

confidence: 99%

Energy Efficiency Management in Small and Medium-Sized Enterprises: Current Situation, Case Studies and Best Practices

Gennitsaris

Oliveira

Vris³

et al. 2023

Sustainability

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show abstract

“…Q k takes place [39]. As illustrated in Equations ( 6) and (7), two essential performance indicators, namely, exergy efficiency (ϕ k ) and exergy destruction rate ( . Ex D,k ), can be derived from Equation (5), for the kth component when exergetic fuel and product rates are well defined [38,39].…”

Section: Statementioning

confidence: 99%

“…Depending on various temperature levels, industrial WH can be split into low-, medium-, and high-grade WHs. Although there are no clearly defined values for these three levels, 650 • C and 230 • C may be accepted as the dividing points [7,8].…”

Section: Introductionmentioning

confidence: 99%

Advanced Exergy Analysis of Waste-Based District Heating Options through Case Studies

et al. 2021

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The heating of the buildings, together with domestic hot water generation, is responsible for half of the total generated heating energy, which consumes half of the final energy demand. Meanwhile, district heating systems are a powerful option to meet this demand, with their significant potential and the experience accumulated over many years. The work described here deals with the conventional and advanced exergy performance assessments of the district heating system, using four different waste heat sources by the exhaust gas potentials of the selected plants (municipal solid waste cogeneration, thermal power, wastewater treatment, and cement production), with the real-time data group based on numerical investigations. The simulated results based on conventional exergy analysis revealed that the priority should be given to heat exchanger (HE)-I, with exergy efficiency values from 0.39 to 0.58, followed by HE-II and the pump with those from 0.48 to 0.78 and from 0.81 to 0.82, respectively. On the other hand, the simulated results based on advanced exergy analysis indicated that the exergy destruction was mostly avoidable for the pump (78.32–78.56%) and mostly unavoidable for the heat exchangers (66.61–97.13%). Meanwhile, the exergy destruction was determined to be mainly originated from the component itself (endogenous), for the pump (97.50–99.45%) and heat exchangers (69.80–91.97%). When the real-time implementation was considered, the functional exergy efficiency of the entire system was obtained to be linearly and inversely proportional to the pipeline length and the average ambient temperature, respectively.

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“…Zhang et al show the difficulties of waste heat usage by optimising the utilisation rate for a district heating system and a cooling process depending on the availability of heat and the seasonal demand. Furthermore, they also consider how many consumers can be supplied with the available heat capacity [3]. The economic constraints make it challenging to replace current heating plants, as the profitability depends on different boundary conditions, such as the fuel prices or the investment required to integrate the sustainable heat source.…”

Section: Introductionmentioning

confidence: 99%

Design and Operational Optimisation of a Combined Cooling, Heating and Power Plant to Enable Waste Heat Integration into an Existing District Heating Network

Stock,

Berrenberg,

Xhonneux

et al. 2023

36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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The substitution of fossil fuels in current energy systems is essential on the path to carbon neutrality. In the building sector, different renewable and waste heat sources could be used in district heating systems to replace fossil-based heating plants. However, if new heat sources are integrated into multi-energy systems, the profitability of present heating plants could decrease. At the Forschungszentrum J ülich, the waste heat from a new high-performance computer is to be integrated into the local district heating system in order to reduce overall CO 2 emissions. This waste heat integration will have an impact on the holistic multi-energy system of the campus, which is mainly supplied by a combined cooling heat and power plant (CCHP). This paper investigates the described waste heat integration using a bi-objective optimisation approach. The proposed model optimises the operation of the overall multi-energy supply system with waste heat integration. Furthermore, the optimisation model allows for the optimal design of the required heat pump system and additional absorption chiller capacity that enable efficient CCHP heat usage despite the waste heat integration. In addition, the effects of lowering district heating temperatures and changed energy prices are studied. The results show that integrating waste heat reduces the overall CO 2 emissions of the multi-energy system and even more if the integration is combined with a lowering of district heating temperatures. Furthermore, the optimisation shows that a cost reduction is feasible by increasing the absorption chiller capacity that uses the produced heat of the CCHP.

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

Cited by 12 publications

References 34 publications

Energy Efficiency Management in Small and Medium-Sized Enterprises: Current Situation, Case Studies and Best Practices

Energy Efficiency Management in Small and Medium-Sized Enterprises: Current Situation, Case Studies and Best Practices

Advanced Exergy Analysis of Waste-Based District Heating Options through Case Studies

Design and Operational Optimisation of a Combined Cooling, Heating and Power Plant to Enable Waste Heat Integration into an Existing District Heating Network

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