Kelvin help centre
How Kelvin works, screen by screen: refrigeration, HVAC and hydronic design, reports and sign-off, Deployr and training, and what Kelvin’s verdicts and refusals mean.
Getting started
Set up your firm, bring in colleagues, start a project and find your way around.
Heat load and the cycle
Rooms and their loads, the project's location, and the refrigeration cycle that carries them.
- Build a room's heat load
- Draw a room plan and place its evaporators and doors
- Set a room's insulation and adjacency
- Add doors and choose an infiltration method
- Enter product, internal and defrost loads
- Work out a product's cooling and freezing time
- Read a room's load build-up
- Send heat loads to Cycle and move unassigned rooms
- Set the project's location and design ambient
- Set up a refrigeration cycle
- Set up a two-stage or cascade cycle
- Design a transcritical CO₂ booster
- Save a cycle design and compare revisions
Pipework, equipment and charge
Route and size the pipework, judge the equipment, and total the refrigerant charge.
- Draw and size a pipe layout
- Choose how pipes are sized
- Choose a tube series and judge its pressure rating
- Size a suction riser for oil return
- Read the segment ledger and its checks
- Trace a site plan: background, scale and sketch
- Enter equipment from its datasheet
- Enter a compressor: rated point, coefficients or displacement
- Read the duty ledger: Pass, Undersized, Oversized and Not judged
- Run a room's pull-down
- Total the refrigerant and oil charge
Energy and running cost
What the plant will use over a year, what it costs to run, and its bill of materials.
HVAC design
Design conditions, space loads on a building plan, air systems, ducts and fans.
- Set an HVAC project's design conditions
- Draw a building plan and its spaces
- Calculate a space's cooling and heating loads
- Set up an air system and its coil
- Place an air system's unit and registers
- Draw and size a duct network
- Enter a duct fitting's loss coefficient
- Enter a fan from its submittal
- Missing reference tables
Hydronic design
Circuits, plant, pipe sizing, pumps, and expansion and volume.
Reports, versions and sign-off
Issue reports, keep every revision, and have work checked and approved.
Equipment and reference libraries
Your firm's equipment from its datasheets, and the refrigerant and reference data Kelvin holds.
Working with Deployr
Pair with a client's Deployr, take their engineering requests, and send the work back.
- Pair with a client's Deployr
- Work from the Requests inbox
- Take a request from review to issue
- Set a request's status, and what Deployr is told
- Send the work back to a client's Deployr
- Issue and revoke API keys
- Send Kelvin's events to another system with webhooks
- Send client email from the client's own address
Training and classes
The free practice, tools and P–T charts, and running a class: joining, handing in and marking.
Why Kelvin says that
What Kelvin's verdicts, refusals and notices mean, where its figures come from, and what to do next.
- Why does an equipment pick read Not judged?
- Why does my booster's medium temp pack read Undersized?
- Why won't the cycle solve at my temperatures?
- Why can't I compare a cycle on another refrigerant?
- Why does Pipe Layout size only a cascade's low stage?
- Why does a pipe segment read Pressure not judged?
- Why are my annual energy figures an upper bound?
- Why does my booster's ejector read Not applied?
- Why are EC cooling fans not estimated on Energy?
- Why does a P–h diagram say Not solved here?
- Where Kelvin's refrigerant figures come from
Your plan and account
Plans and billing, signing in, and your account.
Still stuck?
Email Sentoro and a person will answer. Say which screen you were on, what you did, and what you expected to happen.