Calculate actual heat losses from pipes
Calculate the actual heat loss from the pipeline by taking into account the temperatures of the hot water and air surrounding the pipeline, the thickness and properties of the thermal insulation, and in the absence of insulation, determine the heat loss through an open pipeline with the help of this online tool. This program is based on the algorithm of heat passing through a cylindrical wall to provide the most accurate calculation of the actual heat loss from the pipeline.
Method for Calculating Heat Losses from the Pipe
The value of heat losses from the pipeline section in one hour, W:
Q = b · l · q
- b - The coefficient takes into account heat losses due to supports, connections, and fittings, which is accepted according to СНиП 2.04.014 and is equal to steel pipelines with DN<150 mm b=1.2, DN>=150 b=1.15, and for non-metallic pipes b=1.7. Note. The calculation is carried out without taking into account the coefficient b if it is not specified in the table.
- l – section length, m;
- q – heat loss from one meter of pipe in one hour, W/m.
q = k · 3.14 · (tв - tc)
- tв – water temperature in the pipeline, °C;
- tс – the temperature of the air surrounding the pipeline, °C;
- k – linear heat transfer coefficient, W/m°C;
k = 1 / ( (1/2λт)·ln(dзт/dвт) + (1/2λи)·ln(dзи/dви) + 1/(αн·dзи) )
- λт – coefficient of thermal conductivity of the pipe material, W/m²°C;
- λи – coefficient of thermal conductivity of thermal insulation, W/m²°C;
- dвт, dзт – inner and outer diameters of the pipe, respectively, m;
- dви, dзи – inner and outer diameters of the insulation, respectively, m;
- αн - coefficient of heat transfer on the outer surface of thermal insulation, W/m²°C, adopted according to СНиП 2.04.14 'Thermal insulation of equipment and pipelines';
Sample calculation of heat losses
Online Calculations
District heating substations
Substations of centralized hot water supply
Temperature curve of the heating system
Data verification heat meter
Calculation of the throttle diaphragm
Calculation of the temperature of a mix of several flows
Calculation of the diameter of the distribution manifold
Calculation of thermal expansion of pipelines
Calculation of the U-shaped compensator
Calculation of the L-shaped compensator
Calculation of the Z-shaped compensator
Calculation of the Axial compensator
Calculation of the pressure drop in the pipe
Calculation of pipe diameter by flow
Calculation of the distance between pipe supports
Normative heat losses from pipelines of the heat network
Calculation of heat losses from pipelines
What is cheaper to heat? gas, firewood, coal, electricity