- Energy consumption:
The specific energy consumption is about 1300 kWh/ ton of final product. The power
factor of Agrex Saigon Company is low from 0.71-0.82 and the factory had to pay fee
for the reactive energy. The high reactive power consumptions are due to the various
electrical devices, such as electric motors and magnetic ballast for lamps. The reactive
power depends on the power factor and the power consumed during the various
periods (peak, partial peak and off-peak).
The main form of energy used in Agrex Saigon Company is electrical energy (66%).
Besides electricity, diesel oil (23%) and LPG (11%) are also used in meeting the
thermal demand. The factory consumes annually about 2 million kWh of electricity,
which is obtained from two sources:
(1) National network, with three-part tariff (For industrial sectors):
• Partial-peak (Normal): 847 VND/kWh (from 4 AM to 6 PM)
• Peak period: 1474 VND/kWh (from 6 PM to 10 PM)
• Off-peak: 429 VND/kWh (from 10 PM to 4 AM)
(2) Hiep Phuoc IPP power grid: This power supplier charges a flat rate of 1,200
VND/kWh (including VAT). This power grid is used only during peak period to
replace higher price electricity from the national grid.
Electricity consumption by freezers ranges from 150 to 220 kWh/ton of frozen shrimp
or squid, and depends on the size of frozen products. The mean electricity
consumption for frozen shrimps is 100kWh/ ton of products whereas, the average
electricity consumption for filleting of herring ranges from 120 to 120 kWh/ ton of
packed fillet products (UNEP, 1999). The main operation, which accounts for the
maximum share of electricity consumption, is the final cold storage unit (Figure 2).