2) Calculate estimates of energy consumption when you dry your hands in each of the three ways shown above. Consider only those processes for which information is given on the next page. Aggregate and express energy use as primary energy. Cotton roller towels: Distance to laundry where cotton towels are washed and dried: 30 km. Capacity of van: 200 rolls on forward and return journey. Diesel consumption of van: 16 litres / 100km Delivery of clean towels and removal of dirty towels is undertaken by the same van Length of towel: 40m Length of each pull of the towel: 20cm Dry weight of towel: 4.5kg Required electricity for washing: 0.33 kWh per kg of cotton Drying requires the evaporation of 1kg of water per kg of dry cotton The latent heat of evaporation of water : 2500 kJ/kg The dryers at the laundry are electrically powered. Appendix 1: Background Information The energy used in a system under analysis is measured in "joules" (J); larger values are expressed in multiples of 10 and prefixes are used to denote the multiplication factor (see Table A1). For example, 1,000,000 J is written