I have a judicial case with a nitrogen tunnel for cooling (not freezing) French Frites from 20°C to 0.5°C.

I would like some feedback from you guys because, something is very wrong with following case, at least taht's my opinion.

They're cooling now 5.000 kg French Frites with nitrogen in a special constructed tunnel - same they're using to freeze products.

The estimate is a production of 5.000 kg/hour, 8 hours/day, 5 days/week and 50 weeks/year.

The price for 1 l Liquid Nitrogen LIN is 0,0756 € and they need now 0.27 to 0.30 l LIN/kg product.

In the tunnel are 10 fans of 0.75 kW and two exhaust fans of 1.5 kw.

They also have to pay a rent for the isolated LIN storage tank of 900 €/month.

The tunnel cost was +/- 125,000 €

I will not say more for the moment but those capable of doing some rough load calculations and the appropriate energy price for this, do once the calculation and compare it with how we, the classical refrigeration engineers should solve this problem.

What's your conclusion?