LOGSTOR Heat Loss Calculator
Estimate heat loss, yearly energy waste, and annual cost for pre-insulated district heating pipes.
Note: This is a planning estimate tool. Real project values depend on exact pipe diameter, burial conditions, moisture, flow rate, and manufacturer data sheets.
What this logstor calculator does
This calculator gives a quick engineering estimate for thermal losses in pre-insulated district heating networks, often associated with LOGSTOR-style pipe systems. With a few inputs, you can estimate:
- Heat loss per meter of pipe
- Total network heat loss
- Annual energy loss in kWh
- Annual operating cost of that lost heat
- Approximate CO₂ impact
Core formula used
The model uses a simplified linear heat loss approach.
q_m = U × ΔT (W/m)
Q_total = q_m × L (W)
E_year = (Q_total × hours) / 1000 (kWh/year)
Cost_year = E_year × energy_price
Where U is the overall heat loss coefficient per meter. In real design work, U varies with pipe size, insulation thickness, twin/single configuration, soil conductivity, and installation quality. This tool is designed for fast comparison and screening decisions.
How to choose insulation series
Series 1
Lower insulation performance. Usually lower first cost, but higher thermal losses over time.
Series 2
Balanced choice for many district heating projects. Good compromise between CAPEX and OPEX.
Series 3
Best insulation performance among the options shown. Often attractive when fuel prices are high or long operating life is expected.
Worked example
For a 500 m route, 85°C supply average, 10°C ambient, Series 2 insulation, and full-year operation:
- Temperature difference is 75°C.
- Heat loss per meter is approximately 13.5 W/m.
- Total loss is about 6.75 kW.
- Annual energy loss is roughly 59,130 kWh.
At $0.12/kWh, that becomes about $7,095/year in thermal loss cost. This makes insulation level and pipe routing decisions financially meaningful.
How to use results in real projects
- Compare insulation classes before procurement.
- Estimate lifecycle cost sensitivity to fuel price scenarios.
- Identify high-loss branches for retrofit planning.
- Support feasibility studies for network expansion.
Limitations and practical notes
This simplified calculator is excellent for planning, but detailed design should include:
- Exact DN pipe geometry and carrier pipe material
- Soil thermal conductivity and wetness variations
- Supply/return temperature profiles over seasons
- Pump energy, pressure drop, and flow regime analysis
- As-built installation quality and aging effects
FAQ
Is this an official manufacturer calculator?
No. It is an independent educational estimator designed for quick thermal-loss analysis.
Can I use this for cooling lines?
Yes, but when ambient temperature exceeds medium temperature, the model will show heat gain behavior instead of loss.
What if my utility bills are not in $/kWh?
Convert your energy tariff to equivalent $/kWh before using the tool for annual cost calculations.