Evaluation of low-exergy heating and cooling systems and topology optimization for deep energy savings at the urban district level

Allen, Amy J.; Henze, Gregor P.; Baker, Kyri; Pavlak, Gregory S.

doi:10.1016/j.enconman.2020.113106

Cited by 45 publications

(17 citation statements)

References 28 publications

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“…The characteristics of near-ambient temperature systems also motivates consideration of network configurations beyond the typical ring or radial networks used by earlier generations of district thermal energy systems. The "search space" of potential network configurations can quickly become intractable for manual comparison of scenarios (Allen et al, 2020).…”

Section: Motivationmentioning

confidence: 99%

Modeling district heating and cooling systems with URBANopt, GeoJSON to Modelica Translator, and the Modelica Buildings Library

Long¹,

Gautier²,

Elarga³

et al. 2021

Building Simulation Conference Proceedings

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Section: Motivationmentioning

confidence: 99%

Modeling district heating and cooling systems with URBANopt, GeoJSON to Modelica Translator, and the Modelica Buildings Library

Long¹,

Gautier²,

Elarga³

et al. 2021

Building Simulation Conference Proceedings

Self Cite

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“…A higher electrical efficiency of 28.4% was obtained, with an improvement of 6.5% compared to the conventional system. Allen et al [20] used energy modeling for comparing the energy performance of conventional and advanced district thermal energy systems at the urban district level. Radiant hydronic heating, ventilation, and air conditioning systems, mated with low-exergy district thermal energy systems, had a source energy use intensity that was 49% lower than that of conventional systems.…”

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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“…In addition, 34% cost savings was been made during the cooling season for the radiant floor system with the predictive controller. A study performed by Allen et al 18 offered that significant potential energy savings can be obtained with topology optimization to facilitate the adoption of advanced district thermal energy systems. In the case of radiant hydronic HVAC systems integrated with low exergy district thermal energy systems, an energy saving of 49% obtained according to the conventional district thermal energy systems.…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal performance of double-layered thermally activated building system in heating mode

Çalişir

Öztürk

Genç

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Main principle of the thermally active building system (TABS) which is a type of radiant heating system operating at low temperatures range as 30–50 ˚C is to bring the ambient temperature to the desired level by heating the building mass. TABS system is also a system that can heat at low temperatures such as underfloor heating systems, and both systems can be applied in multi-story buildings. Because these systems operate at low temperatures, they are compatible with both each other and with renewable energy sources. At the same time, heating and cooling at temperatures close to room temperature can also increase the coefficient of performance (COP) in these systems. In this study, a double-layered system which is a new concept was designed by using both underfloor heating and TABS on the same floor; and the thermal performance of the double-layered TABS system (DLTS) was examined using the FLUENT/ANSYS programs. In the calculations, different supply water temperatures (30, 35 and 40 °C) and the pipe positions on the vertical axis (0.001 m, 0.050 m, and 0.100 m) were considered. It can be obtained from the results that the efficiency of the heating systems can be increased by using the new DLTS proposed in this study.

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Evaluation of low-exergy heating and cooling systems and topology optimization for deep energy savings at the urban district level

Cited by 45 publications

References 28 publications

Modeling district heating and cooling systems with URBANopt, GeoJSON to Modelica Translator, and the Modelica Buildings Library

Modeling district heating and cooling systems with URBANopt, GeoJSON to Modelica Translator, and the Modelica Buildings Library

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

Investigation of thermal performance of double-layered thermally activated building system in heating mode

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