Page 243 - Shaping A Sustainable Future

Display freezers such as chest freezer and double deck
freezer: Cost Estimated: $1,000 - $10,000/freezer.
Depending on product type and quantity. Average goods
cost is $3,000 / freezer (estimated value). Typical freezer
temperature should be at -18°C. Still, and sometimes
it is too low at -20°C. With the temperature sensors
installed, it is possible to monitor the temperature data
continuously and re-tune the freezers’ temperatures
when necessary. Maintenance can be scheduled to
ensure the freezers perform at the optimum temperature
setting level to achieve maximum energy savings.

A 1°C increases the freezer’s power usage by 5 to 10 %.
Thus operating at 2°C colder will result in about a 20% Figure 24: Power consumption of a freezer.
(worse case) increase in the freezer utility bill. Below
is the calculated power consumption of a freezer used The company has 230 freezers, as shown in Table 10.
at Song Fish per day (using an average power rating of Thus, with the sensors, it is estimated that the company
495 W per freezer - Figure 24), around $2.50 or $76 per can save 25% * 230 freezers * $15.2 waste energy =
month. Two freezers were found to be lower than -18°C, $874 per month, representing a carbon emission saving
hence increasing the utility cost to $91.20 per month for of 1,716 kg CO per month.
each freezer, with an extra power consumption = $91.20 2
- $76 = $15.20 (20 % extra energy). The occurrence rate
of an un-optimized freezer represents two findings out
of 8 installed sensors = 25 %.
Location Number of Average Total
Freezer (pcs) Number of Number
Analysis of Collected Data Freezer (pcs) of Freezer
(pcs)
HQ 16
Hence, with monitoring, we are optimistic about ~18 ~230
optimising the temperature of the freezers at Song Fish 12 x Outlets About 14-21
HQ to reduce carbon emissions by 1716.375 kg CO per
2
month (see Table 10). This will reduce the total utility Table 10: Number of freezers in HQ and outlets.
bill by $874 per month. Since the sensor deployment,
there has been no power outage failure. An SMS alert
will be sent to Song Fish personnel in the event of a
power outage failure. Estimated saving per incident of
power surge or outlet power supply failure will result in
loss of all freezers goods if prompt action is not taken.

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