Modification of the shape of thermal insulation of a twin-pipe pre-insulated network

Teleszewski, Tomasz Janusz; Żukowski, Mirosław

doi:10.1063/1.5092033

Cited by 6 publications

(17 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The impact of distance between heating pipes on heat losses of pre-insulated pipes has been described in papers [15,18,19]. By analysing heat exchange in pre-insulated pipes, it is also possible to reduce heat losses by modifying the shape of thermal insulation, which was also done in works for twin pipe pre-insulated pipes [17,20].…”

Section: No Pipes (Figure 1)mentioning

confidence: 99%

“…This method is mainly used in twin pipes, where the supply and return pipes are located in circular insulation [15,16]. One of the methods to reduce heat loss in pre-insulated twin pipes is to change the cross-sectional shape of the twin pipe thermal insulation from round to oval [17], elliptical [18] or egg shape [19,20] while maintaining the same cross-sectional area of thermal insulation. Heat losses in pre-insulated twin pipes can be determined by simplified analytical methods [12,21,22] and numerical methods [16][17][18][19]23].…”

Section: Introductionmentioning

confidence: 99%

“…One of the methods to reduce heat loss in pre-insulated twin pipes is to change the cross-sectional shape of the twin pipe thermal insulation from round to oval [17], elliptical [18] or egg shape [19,20] while maintaining the same cross-sectional area of thermal insulation. Heat losses in pre-insulated twin pipes can be determined by simplified analytical methods [12,21,22] and numerical methods [16][17][18][19]23]. Heat losses in pre-insulated double pipes with round thermal insulation are about 30% lower than heat losses in pre-insulated single pipes [19,20,22].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reduction of Heat Losses Using Quadruple Heating Pre-Insulated Networks: A Case Study

2019

Self Cite

View full text Add to dashboard Cite

The paper presents an analysis of heat loss and reductions of annual emissions of air pollutants of a quadruple pre-insulated heating network by comparing this solution with the existing pre-insulated network consisting of four pre-insulated single pipes and the variant consisting of two twin pipe pre-insulated. For calculations, an existing heating network located in central Poland was adopted, where heat is transported for heating purposes of buildings and domestic hot water with circulation of domestic hot water through four separate pre-insulated underground pipes. The idea of the construction of four pre-insulated pipes presented in the paper consists in the location of four steel pipes in a common round thermal insulation, which perform the role of heat transport for heating purposes in multi-family buildings (supply and return) and two pipes transporting hot water (a pipe with domestic hot water with circulation). In Poland, heating pipes used in multi-family housing have a larger diameter compared to domestic hot water pipes, which is why standard twin pipe heating pipes have been used in the construction of four pre-insulated networks, in which the domestic hot water pipe has been added to the thermal insulation and circulation of domestic hot water. In order to determine heat losses, a simplified two-dimensional model of conductive heat transfer was developed using Fortran to create a computer program. The results of numerical simulations show that the use of twin pipes for the construction of pre-insulated quadruple networks has contributed to a significant reduction in heat loss in relation to the existing single pre-insulated network (up to 57.1%), while reducing the thermal insulation field of the cross-section of the pre-insulated pipe by 21.4%.

show abstract

Section: No Pipes (Figure 1)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reduction of Heat Losses Using Quadruple Heating Pre-Insulated Networks: A Case Study

2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…In pre-insulated triple pipes, heat losses are about 45% lower than in single pre-insulated pipes [4]. Teleszewski and Zukowski [5] performed calculations for an aboveground pre-insulated network with Cassini oval shaped thermal insulation. The calculations were made for the outside temperature from −24 to 0 • C for the assumed Robin's boundary condition.…”

Section: Introductionmentioning

confidence: 99%

“…The calculations were made for the outside temperature from −24 to 0 • C for the assumed Robin's boundary condition. In the case of Cassini oval shape, average heat losses are smaller by about 14% than for pipes with circular thermal insulation [5]. Heijde et al [6] based on the results of the analytical model calculation, showed that the heat losses in a typical heating network are independent of the flow of the heating medium.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Geometric Parameters of Thermal Insulation of Pre-Insulated Double Pipes

Krawczyk

Teleszewski

2019

Energies

View full text Add to dashboard Cite

This paper presents the analysis of the heat conduction of pre-insulated double ducts and the optimization of the shape of thermal insulation by applying an elliptical shape. The shape of the cross-section of the thermal insulation is significantly affected by the thermal efficiency of double pre-insulated networks. The thickness of the insulation from the external side of the supply and return pipes affects the heat losses of the double pre-insulated pipes, while the distance between the supply and return pipes influences the heat flux exchanged between these ducts. An assumed elliptical shape with a ratio of the major axis to the minor half axis of an ellipse equaling 1.93 was compared to thermal circular insulation with the same cross-sectional area. All calculations were made using the boundary element method (BEM) using a proprietary computer program written in Fortran as part of the VIPSKILLS project.

show abstract

Numerical analysis of MHD nanofluid flow and heat transfer in a circular porous medium containing a Cassini oval under the influence of the Lorentz and buoyancy forces

et al. 2022

View full text Add to dashboard Cite

show abstract

Modification of the shape of thermal insulation of a twin-pipe pre-insulated network

Cited by 6 publications

References 10 publications

Reduction of Heat Losses Using Quadruple Heating Pre-Insulated Networks: A Case Study

Reduction of Heat Losses Using Quadruple Heating Pre-Insulated Networks: A Case Study

Optimization of Geometric Parameters of Thermal Insulation of Pre-Insulated Double Pipes

Numerical analysis of MHD nanofluid flow and heat transfer in a circular porous medium containing a Cassini oval under the influence of the Lorentz and buoyancy forces

Contact Info

Product

Resources

About