Determining the optimum economic insulation thickness of double pipes buried in the soil for district heating systems

Li, Fating; Jie, Pengfei; Fang, Zhou; Wen, Zhang

doi:10.1007/s11708-020-0680-5

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…Where, S denotes the annual financing cost rate; i denotes the interest rate (10% in the present study); n denotes the lifetime of the material (15 years); P p , P ins1 , and P ins2 denote the purchase and installation cost of the pipe, the insulation layer #1, and the insulation layer #2, respectively, RMB/m 3 ; P 3 denotes the purchase and installation cost of the protective layer, RMB/m 2 ; V 0 , V 1 , and V 2 denotes the volume of the pipe, the insulation layer #1, and the insulation layer #2, m 3 ; l denotes the length of the unit pipe, equaling one meter; and A 3 denotes the area of the protective layer, m 2 .…”

Section: Optimization Methodsmentioning

confidence: 99%

“…District heating systems (DHSs) have been widely used across the world as they typically possess the advantages such as ease at maintenance, high heating supply efficiency, and high capacity per unit [1], making them particularly beneficial for heat-demand intensive regions such as Nordic countries and northern cities in China. However, comparing with distributed heating systems, one of the major downsides of DHSs is the large thermal loss through the distribution pipe network, spanning a wide range from 10% to 30% of the total heating supply [2].…”

Section: Introductionmentioning

confidence: 99%

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A Data-driven Model of Pipe Diameter and Insulation Thickness Optimization for District Heating Systems

Chen

et al. 2022

J. Phys.: Conf. Ser.

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One of the major downsides of district heating systems is the large thermal loss through the distribution pipe network, which is expected to be alleviated through the optimization for the thickness of the insulation layer and the pipe diameter. Although a few previous studies have developed a diversity of techno-economic models for optimizing the pipe diameter or the insulation thickness of the district heating pipeline, few of them were able to capture the complicated relationship among the heat loss, pipe diameter, insulation thickness, operation parameters, and complex exterior conditions in the real world (such as the conditions of the soil and degradation condition of the insulation layer). The present study devises a combined model that first bases on the heat transfer model to theoretically estimate heat losses and then bases on the data-driven artificial-neural-network model to fill in the gap between the measured and theoretical heat losses. Results show that the predicted heat losses via the developed combined model reproduce the measured data well. Furthermore, compared with the original pipe diameter and insulation layer thickness, the optimized diameters of the pipe and thickness values of the insulation layers via the proposed combined model are all elevated.

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Section: Optimization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Data-driven Model of Pipe Diameter and Insulation Thickness Optimization for District Heating Systems

Chen

et al. 2022

J. Phys.: Conf. Ser.

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“…Padding floor, walls, and ceiling of the buildings with good insulations sheets decrease energy losses and minimizes loads of heating and cooling systems. [31][32][33][34][35][36] Applying thermal insulation ensures energy conservation accomplishment in a more safe and operable manner. Recycling wastes into a useful products has good impacts as regards to economy and environment.…”

Section: Introductionmentioning

confidence: 99%

Newsprint microcrystalline fibers reinforced styrene butadiene rubber as a low thermal conducting material: Effect of electron beam irradiation and fiber content

El‐Nemr

Ali

Gad

et al. 2022

Polymer Engineering & Sci

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The present study focuses on utilizing polystyrene emulsion treated newsprint microcrystalline fibers (NPMCF). These treated fibers were then added to styrene‐butadiene rubber (SBR) at different concentrations, namely, 3, 6, 9, and 12 phr (part per hundred part of rubber). Mixing of ingredients was carried out on a rubber roll mill and afterward molded as a thin film on a hot press, then, exposed to electron beam irradiation doses up to 200 kGy so as to enhance the treatment of the composites. Mechanical properties of the composites, such as tensile strength, elongation at break, tensile modulus, and cross‐link density were enhanced by adding the treated fiber to SBR and by irradiation, and this enhancement was obtained at 6 phr fiber at 100 kGy. Measurements of scanning electron microscopy (SEM) proved the adhesion of the treated fibers to SBR. The thermal conductivity was measured for the prepared composites as a function of electron beam irradiation and fiber content. It was found that the thermal conductivity decreases according to fiber loading (up to 6 phr fiber) and irradiation dose.

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Optimization of radiator area of CHP-based district heating system based on energy cascade utilization

Jie¹,

Zhou²,

Wei³

et al. 2023

Alexandria Engineering Journal

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Determining the optimum economic insulation thickness of double pipes buried in the soil for district heating systems

Cited by 7 publications

References 36 publications

A Data-driven Model of Pipe Diameter and Insulation Thickness Optimization for District Heating Systems

A Data-driven Model of Pipe Diameter and Insulation Thickness Optimization for District Heating Systems

Newsprint microcrystalline fibers reinforced styrene butadiene rubber as a low thermal conducting material: Effect of electron beam irradiation and fiber content

Optimization of radiator area of CHP-based district heating system based on energy cascade utilization

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