In Energy comparison scenarios, EC cooling fans reads not estimated when Kelvin has nothing published to work the saving from. The row says why.
Why
What faster fans save depends on how much more heat the condenser rejects at a higher fan speed, and only the condenser's datasheet gives that. Kelvin takes its capacity at a higher speed against its main rating: holding heat rejection, the condensing TD falls in the ratio of the two. Without that rating, Kelvin uses no rule of thumb in its place.
The reasons it gives
- No higher-speed rating has been entered for the condenser.
- The condenser's heat rejection is published at one TD only, so the datasheet doesn't give its TD at a higher fan speed.
- The higher-speed rating is incomplete, or isn't a faster speed with more capacity than the main rating.
- The condenser is rated for another refrigerant, and its datasheet gives no factor for this one.
- The analysis carries no design condensing TD.
- The design is a transcritical booster or a cascade. A gas cooler holds its approach whatever the fans do, and a cascade's condenser belongs to its high stage, which the comparison doesn't re-solve.
What to do
- 1
On Equipment, choose the condenser's model to open its entry.
- 2
Fill in Rating at a higher fan speed from the same datasheet: Fan speeds are given as, Speed the rating above is at, Higher speed, the capacity or heat rejection at the higher speed, and Fan input at the higher speed, whole unit.
- 3
If the condenser is rated by heat rejection at a TD, set Heat rejection at other TDs to Linear with TD, as published, but only if the datasheet says so.
- 4
Save the entry and the selection, then open Energy again.
The datasheet's own fan input at the higher speed is printed beside the result as a check. It isn't used in any figure.