Wednesday August 28, 2019 from 12:00 to 13:30
NEW GENERATION OF LOW-CHARGE AMMONIA UNIT COOLERS
Stefano Filippini1, Umberto Merlo1, Lorenzo Noto La Diega1, Matteo Carmelo Romano2, Ennio Macchi2.
1LU-VE GROUP, Uboldo, Italy; 2 Politecnico di Milano University, Milano, Italy
Industrial refrigeration uses ammonia unit coolers for the principle processes of conservation and freezing of foodstuffs.
For several years, LU-VE has proposed its LSA range of unit coolers with very small tube diameter (just 1/2”) and specialized surface; this range compared to the traditional solution (tube diameter of 5/8”) has an interior volume of over 50% less at same circulation rate.
The LSA range has recently been completely renovated. Thanks to new concepts of refrigerant distribution, it is now possible to operate with fluid charge reduced even further. In fact, the revised circuiting allows operation with a very limited number of recirculations, down from the canonical 3-4 to values as low as 1.8 with a major containment of the ammonia charge in the unit cooler and consequently within the entire plant.
The article describes the new configuration of the product and the experimental activities carried out to optimize performance.