Abstract
The synergy between highly energy efficient buildings
and low-energy district heating (DH) systems is a
promising concept for the optimal integration of energy
saving policies and energy supply systems based on
renewable energy (RE). Distribution heat losses
represent a key factor in the design of low-energy DH
systems. Various design concepts are considered in
this paper: flexible pre-insulated twin pipes with
symmetrical or asymmetrical insulation, double pipes,
triple pipes. These technologies are potentially energyefficient
and cost-effective solutions for DH networks in
low-heat density areas. We start with a review of
theories and methods for steady-state heat loss
calculation. Next, the article shows how detailed
calculations with 2D-modeling of pipes can be carried
out by means of computer software based on the finite
element method (FEM). The model was validated by
comparison with analytical results and data from the
literature. We took into account the influence of the
temperature-dependent conductivity coefficient of
polyurethane (PUR) insulation foam, which enabled to
achieve a high degree of detail. We also illustrated the
influence of the soil temperature throughout the year.
Finally, the article describes proposals for the optimal
design of pipes for low-energy applications and
presents methods for decreasing heat losses.
| Original language | English |
|---|---|
| Title of host publication | 12th International Symposium on District Heating and Cooling |
| Publication date | 2010 |
| Pages | 82-90 |
| ISBN (Print) | 978-9949-23-015-0 |
| Publication status | Published - 2010 |
| Event | 12th International Symposium on District Heating and Cooling - Tallinn, Estonia Duration: 5 Sept 2010 → 7 Sept 2010 Conference number: 12 http://www.dhc12.ttu.ee/ |
Conference
| Conference | 12th International Symposium on District Heating and Cooling |
|---|---|
| Number | 12 |
| Country/Territory | Estonia |
| City | Tallinn |
| Period | 05/09/2010 → 07/09/2010 |
| Internet address |
