1. Estimate the energy consumption of elevators in high-rise apartments. In order to perform this estimate,...

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1. Estimate the energy consumption of elevators in high-rise apartments. In order to perform this estimate, consider the sole ascending portion of the elevator trajectory. Assume that the elevator has empty mass of 500 kg. Consider that the elevator runs every 8 minutes (day and night), that typically 6 people of mass 70 kg take a ride and that on average the elevator goes through 15 flights of stairs (3 m per flight of stairs). Also consider that a 500 kg weight is used to counterbalance the weight of the lift (see figure). If you suppose that the electric motor lifting up the elevator has an average efficiency of 70 %, estimate the average energy cost of an elevator ride in both J and kWh. What is the daily energy consumption of the elevator? Express this number in kWh/day. Comment on the descending portion of the elevator trajectory, how can the energy of this part be recuperated? [max 100 words] [Hints: Energy gain/loss = Mass Gravitational acceleration MACHINE ROOM LANDING LANDING LANDING LANDING CAR OVER RIDE GUIDE RAIL COUNTER WEIGHT 1. Estimate the energy consumption of elevators in high-rise apartments. In order to perform this estimate, consider the sole ascending portion of the elevator trajectory. Assume that the elevator has empty mass of 500 kg. Consider that the elevator runs every 8 minutes (day and night), that typically 6 people of mass 70 kg take a ride and that on average the elevator goes through 15 flights of stairs (3 m per flight of stairs). Also consider that a 500 kg weight is used to counterbalance the weight of the lift (see figure). If you suppose that the electric motor lifting up the elevator has an average efficiency of 70 %, estimate the average energy cost of an elevator ride in both J and kWh. What is the daily energy consumption of the elevator? Express this number in kWh/day. Comment on the descending portion of the elevator trajectory, how can the energy of this part be recuperated? [max 100 words] [Hints: Energy gain/loss = Mass Gravitational acceleration MACHINE ROOM LANDING LANDING LANDING LANDING CAR OVER RIDE GUIDE RAIL COUNTER WEIGHT