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I'm doing a project where I want to design a water powered cinema using a water wheel that connects to an old fashioned film camera. However, I have no idea how much water I would need to generate enough electricity to power the film camera. Any help that could be offered would be much appreciated 🙂
And got the following answer:
You need to get the power required in watts. This is volts x amps. I don't know whether you mean a movie camera or a movie projector. Obviously a projector, and maybe a camera, need lights. If these are electrically operated, the specification will be there on the name plate, or maybe in a manual (try the internet). If the power is in VA or KVA, just call that watts, as this relates well to an inverter with a battery. If it is large, it may need three phase power. You need to determine the power supply that is required, the power and the voltage and the frequency. This is complicated by the projector lamp, as it may draw a surge much more than the continuous power, maybe ten times more, but only for a second or less when switched on. A battery and inverter or a generator needs to be able to accommodate this surge. The frequency could be critical, as it affects the projector speed. A battery and true sine wave inverter combination is one way to get that. This might be called an uninterruptable power supply (UPS). They exist in quite large sizes (10kW or more). Note this is not the basic UPS used with a personal computer. However a typical UPS is only intended for brief operation, so it may need a bigger battery and to be down-rated for running your system. You would need to consult with someone on this. It may be possible to split the power supply up into various requirements. This battery will handle surges in power as might be required, and may allow the battery to deliver more power than the water wheel produces, so long as it is only required some of the time. The inverter provides a precise and stable frequency, something the water wheel will not do well.. Once the power requirement (load) is determined, the power from the water wheel can be determined, after allowing for losses in the generator and other parts. The water wheel power is also measured in watts. It will drive a generator, perhaps through a gearbox. The generator may then charge the battery using a battery charger. How this is done depends on other parts of the system. Without knowing more details, it is difficult to say what you need, as the whole system depends on the power level, and it seems likely some equipment will be adapted to the task. How big is the UPS, how big is the battery, how will it be operated, what generator is used, and so on. The power available in the water itself comes from the flow and the head. It is calculated as: Power_W = (volume_liters x Gravity_m/s/s x Height_m) / time_s where: volume is the amount of water passing the wheel, during the time in seconds. gravity is 9.8m/s/s height is the head (fall) of the water). This power required is more than the electrical power, as there are losses in the gears, generator, charger and battery. If a battery is used, the water power can be less than the electrical power, as the battery can be charged over many hours and the cinema used for a much shorter time. Though a battery wastes about 40% of the energy it is charged with, it can be used to give a higher power level. It delivers less energy overall, but can deliver more power (for a shorter time). Energy is power x time. The link below gives some idea of the design of basic types of water wheels, so you can work out what power your water supply can provide, and see how that matches with what is needed. Then you can ask more questions, unless you can see you need more water than you have. It is probably cheaper and easier to use a large screen TV with DVD approach. The power will be less too. More in the category of a few large car batteries and a true sine wave inverter.