Can anyone help me to calculate the total heat load / hour of an ice bank tank working on direct feed of ammonia. Total length of ammonia coil is 1800 m & dia is 32 mm. Temp. inside tube i.e. ammonia is around -7 deg C and outside temp i.e. water is around 0 deg C. Chilled water pumps are 2 nos. of capacity 80,000 LPH.