Abstract
The transient behaviour of pipe systems is important
in many forms of thermal system such as domestic
hot water, building heating, cooling and district
thermal networks. In this study, dierent approaches
to modelling the dynamic thermal response
of pipelines are investigated through applying three
forms of discretized one-dimensional
ow and heat
transfer model. These were further compared with
fully three-dimensional nite volume method (FVM)
calculations. Firstly, the models were examined to
predict the pipe thermal response considering the
thermal capacity and longitudinal dispersion of turbulent
uid
ow to step changes in the inlet temperature
of a ideally insulated pipe. A model is proposed
combining features of plug-
ow n-continuously
stirred tanks and treatment of the nodes to take into
account the eect of thermal capacitance of the pipe
wall as well as the convective heat transfer from the
pipe outer surface. The results elucidated that the
proposed model is not only able to capture the outlet
temperature changes due to a step change in the
very good agreement against the detailed 3D model
but also oers advantages in computational cost compared
with the 3D model. The proposed model can
be simply implemented in dynamic system simulation
tools. The model is to be extended to include
dynamic ground heat transfer effects.
in many forms of thermal system such as domestic
hot water, building heating, cooling and district
thermal networks. In this study, dierent approaches
to modelling the dynamic thermal response
of pipelines are investigated through applying three
forms of discretized one-dimensional
ow and heat
transfer model. These were further compared with
fully three-dimensional nite volume method (FVM)
calculations. Firstly, the models were examined to
predict the pipe thermal response considering the
thermal capacity and longitudinal dispersion of turbulent
uid
ow to step changes in the inlet temperature
of a ideally insulated pipe. A model is proposed
combining features of plug-
ow n-continuously
stirred tanks and treatment of the nodes to take into
account the eect of thermal capacitance of the pipe
wall as well as the convective heat transfer from the
pipe outer surface. The results elucidated that the
proposed model is not only able to capture the outlet
temperature changes due to a step change in the
very good agreement against the detailed 3D model
but also oers advantages in computational cost compared
with the 3D model. The proposed model can
be simply implemented in dynamic system simulation
tools. The model is to be extended to include
dynamic ground heat transfer effects.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of Building Simulation 2019: 16th Conference of IBPSA. Building Simulation 2019: |
| Editors | V Corrado, E Fabrizio, A Gasparella, F Patuzzi |
| Publisher | IBPSA England |
| ISBN (Print) | 9781775052012 |
| DOIs | |
| Publication status | Published - 1 Mar 2020 |
| Event | 16th IBPSA Conference - Rome, Italy Duration: 2 Sept 2019 → 4 Sept 2019 |
Conference
| Conference | 16th IBPSA Conference |
|---|---|
| Country/Territory | Italy |
| City | Rome |
| Period | 2/09/19 → 4/09/19 |