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v = Q / A·P = q · c · ΔT·c ≈ 4.19 kJ/(kg·K)·Copper · PEX · steel · PP·Flow · pressure · heat · expansion·~1 m/s recommendation·Drinking water · gas · heating·
v = Q / A·P = q · c · ΔT·c ≈ 4.19 kJ/(kg·K)·Copper · PEX · steel · PP·Flow · pressure · heat · expansion·~1 m/s recommendation·Drinking water · gas · heating·

Water,
heat,
flow.

A complete Danish reference work on plumbing & HVAC — from water velocity and flow to heat output, pumps, expansion and drinking-water hygiene. Read the articles. Use the calculators. Ask the assistant. Same login as technical insulation.

13

Calculators

26

Articles

Questions

Fig. 01

Closed heating circuit: circulation pump → flow 70 °C → heating coil → return 50 °C. Copper arrows show the water's flow direction; the output follows P = q · c · ΔT.

Read, calculate, look up — or ask.

Otte værktøjer fra hydraulik til montage — for elever, montører og installatører.

Work it out.

Enter the flow and the temperature difference between supply and return — and get the transferred heat output and the mass flow in seconds. The formula P = q · c · ΔT uses the material constants of water near room temperature.

Open calculators

Example · Heat output from water flow

70/50 °C · ΔT 20 K

P = q·c·ΔT
Flow0,2 l/s
Temperature difference ΔT20 K
Water's c4,19 kJ/(kg·K)
Density ρ≈ 1 kg/l
Mass flow0,2 kg/s
Heat output P≈ 16,8 kW

How it looks craftsmanship.

Tre klassiske arbejdsgange fra faget — tegnet som blueprint: radiator, gulvvarme og rørtryktab.

Radiator is heated

The plumber adjusts the thermostatic valve: hot supply in from the left, cold return out to the right, and heat radiates into the room.

Floor heating is installed

The installer lays 16 mm floor heating pipe in a meander pattern on the insulation slab, secures it and runs the circuits up to the distribution cabinet.

FØREFTER

Pipe pressure drop is measured

Two manometers — one before and one after stretch — show how friction and local losses in bends lower pressure through pipe

One question
in Danish.

The AI assistant can size flow and heating, explain pumps and expansion, and help with drinking water and regulations. Write to it as you would to a colleague.

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Find a school nær dig.

VVS-energiuddannelsen is offered at 13 Places that are particularly assessed: edges, corners, joints, seams, and under furniture in the country. The list is informational — always check the latest and complete offering on the Education Guide's vocational education map.