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

Tomasz Janusz Teleszewski, Dorota Anna Krawczyk and Antonio Rodero
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Tomasz Janusz Teleszewski: Department of HVAC Engineering, Bialystok University of Technology, 15-351 Bialystok, Poland
Dorota Anna Krawczyk: Department of HVAC Engineering, Bialystok University of Technology, 15-351 Bialystok, Poland
Antonio Rodero: School of Engineering Sciences of Belmez, University of Cordoba, 14240 Cordoba, Spain

Energies, 2019, vol. 12, issue 24, 1-12

Abstract: 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%.

Keywords: quadruple pipes; single pipes; twin pipes; pre-insulated district heating; network; energy savings; pollutants emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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