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In order to obtain the necessary information about energy consumption of a specifc spinning mill, one which is able to spin every kind of staple fibre (i.e. cotton, linen, polyester, viscone) in a wide count range using both ring and openend systems was chosen. This spinning mill included not only machines used for manufacturing (blowing room, carding, combing, drawing, roving, spinning, winding), but also included 5 air conditioning systems, 2 compressors and 2555 lamps for illumination. Besides this, the chosen spinning mill used only electrical energy.

The unit power needed for corresponding machines in production line and power for the air conditioning system, compressors and lamps can be seen in Table. Installed power is a power needed for the each equipment if there is no energy loss; the actual power was calculated taking into consideration energy loss or energy effciency. The total installed and actual power needed for each equipment given in the table was obtained by multiplying the number of machines with unit power required. The subtotal of each equipment group is also shown, i.e. subtotal of actual power necessary for carding machines is 229.5 kW. In addition, the last column of the table shows the share of actual power required for each equipment group in the total actual power consumption, i.e. carding machines form 9.44% of the total actual power consumption. The amount of total actual power in the chosen spinning mill was determined as 2432.8 kW in which machines, air conditioning, compressors and illumination were included and the machines consumed energy which formed 78% of the total energy consumption alone.

The chosen spinning mill operated in 3 shifts a day which consisted of 8 hours and also works 25 days a month. Considering the monthly operating time and number of machines, the monthly (May) energy consumption of the chosen spinning mill was calculated and all the data are shown in following table. The actual total monthly energy consumption of the spinning mill was 1459680 kWh/month in May as shown. 78.4% of this energy was consumed by the machines, see Figure 1.a and 37% of the monthly energy consumed by the machines was due to the ring spinning machines (Figure 1.b).

In order to determine the unit energy consumption of unit yarn mass which is known as specifc energy consumption, the monthly energy consumption of the investigated mill were divided by monthly production quantity and the variation obtained is demonstrated in Figure. The amount of specifc energy consumption changed between 3.23 and 3.76 kWh/kg in the chosen mill among the selected months. These values were the average which changed depending on the yarn properties.