Page 151 - Towards A Sustainable Future 2024

Table 6: Dishwasher operating conditions Detergent Consumption Analysis

One tray in the dishwasher Can wash 16 plates Peacehaven uses Opari dishwashing detergent for plate
washing, with 10 litres required every two weeks (Figure
8 trays 154 cutleries 6). The cost of each 10-litre bottle of detergent is $4.80.
By multiplying the price per bottle by the replenishment
Time for 1 tray 3 mins
frequency, we can calculate the total detergent cost over
Time for 8 trays 24 mins the specified time frame. The calculations for the cost of
detergent will be presented in Table 8.
Time taken to wash in a day (8x3 72 mins
trays)
Time taken for 1 year 26,280 mins (C)

The dishwasher utilised by Peacehaven consumed 16.8
kWh of electricity per hour of operation (Table 7). Based Figure 6: Detergent used
on this information, the total electricity consumption and in Peacehaven.
corresponding CO2 emissions associated with dishwasher
operation (Table 7).

Table 7: Dishwater Electricity Consumption.

Time taken for 1 year – 26,280 mins 438 hours
Table 8: Calculation of the detergent consumption
Electricity used for a year 7,358kwh

Price of electricity per kWh $0.27
In 2 weeks 10 litres
Cost of electricity in 26,280 mins (fr C) $1,986.8
= 438hrs per year Cost of 1 litre $4.80
Carbon emission for using electricity 3,081.5 kgCO2/
per year (0.4188kg CO2/kWh) year (E) Cost of 260L (52 weeks) $1,248 (F)

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