SCALE UP DESIGN OF ELECTRIC BASED MILK HEATING SYSTEM
Loading...
Date
2022
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ICAR-NDRI, KARNAL
Abstract
India is largest producer of milk in the world contributing 23 percent of the global milk
production with an average production of 198.4 million tonnes in 2019-20 (NDDB).
About 65% of milk is handled by small scale milk processor and 35 % goes to organized
sector. The quality of the milk processed at unorganized sector is not much good
because of the unavailability of milk processing equipment for small scale processing
and availability of such equipment’s which is not affordable for small scale processing
i.e. use of boiler sometimes is not feasible as it requires high initial investment. With
this view Electric based milk heating system was designed and fabricated. Preliminary
trials were conducted to confirm the feasibility of the system. Performance of the
system was evaluated by heating milk from 4 to 90°C by using 3 paired heaters and 5
paired heaters for utilising different capacity of milk (10 L, 20 L, 30 L, 40 L, and 50 L)
and cooling from 90°C to 37°C by natural cooling and by circulation of tap water.
Performance parameters were taken as heating rate, cooling rate, temperature
distribution, temperature profile and energy consumption. Time required to heat milk
from 4°C to 90°C for capacity 20 – 50 L was observed to be 76 min to 151 min by using
3 paired heaters and 56 min to 106 min by using 5 paired heaters. Heating Rate and
cooling rate for 20 L to 50 L using different paired heater was found to be 1.32 – 0.57
°C/min and 0.88 – 0.61 °C/min respectively. Localized heating on the vessel surface
was reduced because agitator helped in proper mixing and better distribution of heat in
complete vessel. Temperature gradient and energy consumption was found to be in
range 0 – 1.30°C and 4.65 to 9.91 kWh for 20 L to 50 L capacity respectively.