Exercise 1a: Drying your hands Exercise: 1) Identify a suitable functional unit based on service provision. 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. 3) Are there any factors that should be explored using sensitivity analysis? List what you consider the important factors for sensitivity analysis and give a brief explanation of why they are important. Then choose the two most important factors and conduct a sensitivity analysis on them. Explain what you learn from the sensitivity analysis. Data: Electric hand dryers: Electric hand dryers are rated at 2 kW It takes approx. 30 s to dry your hands. 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