Question

In some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 200 L of liquid nitrogen, which has a density of 808 kg/m^3 and boiling point of -196°C .

1) Calculate the heat transfer, in MJ, necessary to evaporate this amount of liquid nitrogen at its boiling point and raise its temperature to 3.00°C. (Use c = 1040 J/kgK and assume it is constant over the temperature range.) This value is the amount of cooling the liquid nitrogen supplies. D2

2) BCD on 1.

3) What is this heat transfer rate in kilowatt-hours? D2

4) BCD on 3. This might be handy: https://openstax.org/books/university-physics-volume-2/pages/1-5-phase-changes#fs-id1170903879019

Answer 1