Connect a heat exchanger and two radiators.
Draw components and connections. Organise the design by building, floor and zone. Reuse templates and extend the model as the project develops.
Components · Connections · TemplatesNJORD BY SPYKEN
Draw the system.
The calculations
follow.
Njord brings drawing, sizing and documentation into one workspace. Develop the system and its calculation basis while the project takes shape.
In your browser · Access by invitation
WHEN THE CONCEPT IS STILL TAKING SHAPE
A change should carry
through the design.
The sketch changes, the calculations must follow, and the documentation needs updating.
Sketches in one tool. Calculations in another. Documentation somewhere else. Each revision means bringing them back into line.
Njord brings that work into one model. Develop alternatives, size the system and prepare a clear design basis while there is still room to change it. Built for the pace of early design and competitive proposals.
Concept illustration
Draw.
Change. Review.
Follow the connections in a simple heating system. When an assumption changes, its effects should be visible in the model and calculations.
Heating60 / 40 °C · FZ
VF · SupplyVR · ReturnDimensions in mm
- 01Place components
- 02Connect & size
- 03Extend the system
Connect the pipes. Njord sizes the system automatically.
View sizing basis
Water at 60/40 °C. Each radiator: 1,000 W. FZ pipe with automatic sizing, maximum 1 m/s and 100 Pa/m. Each supply and return main is 5 m; each radiator branch is 2 m. The third radiator adds a 1 m distribution segment in each direction. Supply and return can have different sizes because water properties change with temperature.
This animated example uses precomputed results from Njord’s calculation engine. Pipe losses shown are per metre of the supply main. Component and valve losses are not shown here.
Concept illustration · MULTIPLE SYSTEMS. ONE CONNECTED DIAGRAM.
Change the airflow.
The heating design follows.
Draw heating and ventilation in the same diagram. Change the airflow: the coil load, water flow and shared heating supply update with it.
Heating + ventilation60 / 40 °C
AirSupplyReturn
CALCULATION SCHEDULECalculations up to date
AHU coil 7.2 kW · Shared heating 13.2 kWUp to date
The drawing and calculation schedule agree. No separate heating spreadsheet to catch up.All connected calculations are up to date.
Example basis
Illustrative connected-system example. Airflow changes from 1,000 to 600 l/s. Air is heated from 8 to 18 °C across a water heating coil, with a fixed volumetric heat capacity of 1.20 kJ/(m³·K). Coil load = airflow × heat capacity × temperature rise.
Heating water: 60/40 °C. At mean 50 °C, water density is 988.06 kg/m³ and specific heat is 4.181 kJ/(kg·K). Water flow = heat load ÷ (density × specific heat × 20 K). The radiator load remains 6 kW; shared load is coil load + radiator load. Pipe losses and heat losses are omitted. Values describe a revised design condition, not live pump control or installed equipment capacity.
This is an animation of the system relationship, not a recording of the application. It does not run a live ventilation calculation or generate export files.
A revision should travel with the design. Keep connected calculations and documentation together, so a change in ventilation does not get lost in a separate heating spreadsheet.
DRAW. CALCULATE. DOCUMENT.
From heat demand
to calculation basis
The illustration shows how a change can be traced from an input to the calculation basis.
Add a radiator to the system.
Flow, sizing and pressure losses follow the drawing. Work across connected systems without manually tracing every change.
Flow · Sizing · Pressure lossFollow the effect on flow and sizing.
Review the results in the application or export the drawing and calculation tables. Keep the design and its evidence together.
In-app review · PDF · ExcelConcept illustration · THE SAME TOOLS. THE SAME CALCULATION ENGINE.
AI assistance through
Njord’s tools.
In development: Describe the system you want to build or change. The AI assistant is being developed to work through Njord’s tools. Njord’s calculation engine performs the calculations; the engineer reviews assumptions and results.
Heating60 / 40 °C · FZ
VF · SupplyVR · ReturnDimensions in mm
Total load 3.0 kWReturn main 18 × 1.0 mmTotal flow 0.036 l/s
Your instruction becomes a model change. Njord calculates the consequences.
DOCUMENTATION IS PART OF THE PRODUCT
Keep the drawing and
its basis together.
Review the design alongside its inputs and calculation results. A connected record makes it easier to explain decisions and take the work into the next project phase.
Built around ISO, EN and national calculation methods, with the inputs and results available for engineering review.
In NjordPDFExcelCSV
FROM THE DESIGN TO YOUR PROJECT MATERIAL
01
System sizing
Pipe sizes, flow distribution, pressure losses, index circuit and pressure diagram.
02
Performance & balancing
Valve schedules, hydronic balancing, insulation, heat loss and radiator schedules.
03
Water & circulation
Domestic water diversity, circulation sizing and hot-water waiting time.
04
The drawing itself
Export the diagram as PDF, PNG or SVG, alongside the calculation tables.
EARLY DESIGN IS THE STARTING POINT
Take the work
into the next phase.
Njord focuses on fast, connected design when a project is taking shape. We are developing a Revit connection to carry that work into detailed design.
01 / EARLY DESIGNNjord
Explore. Size. Document.
Revit connection
In development
In development
02 / DETAILED DESIGNRevit
Continue the project.
BEFORE YOU START
Questions about Njord.
Who is Njord for?
Engineers and design teams working on building services during early design.
Do I have to use AI?
You can work directly with the model. AI assistance is in development and will use the same tools. The calculation engine performs the calculations.
What happens when the design changes?
When you add a component or change a value, Njord recalculates the affected parts of the connected model. If the change affects another connected system, its dependent values update too, helping you keep the drawing and calculations in sync.
Can I check and export the calculations?
Yes. You can inspect the calculation documentation in Njord or export it as PDF or Excel. Inputs and results are available for review, so an engineer can check the design and follow the reasoning behind the values.
Does Njord connect to Revit?
A Revit connection is in development. The aim is to carry work from early design into detailed design, so you can continue the project in Revit. This connection is not available yet.
How do we get access?
Access is by invitation. Arrange a demonstration to discuss your projects. Existing users can use the login link.
NJORD BY SPYKEN
Let’s look at
your design work.
Tell us about the systems you work with.
We can walk through Njord and discuss how it fits your needs.