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Campsite Showers Water Heating. For Chris P.

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50kVA diesel three phase generator supply.

Assume two male and two female showers, or are they all uni-sex these days?

I propose to suggest a large hot water tank for hot water storage, (thanks Simon Barker & Broadgage) then have three (say 1kW or 1.5kW or 2kW} immersion heaters if available, to heat the water. This will provide a balanced limited load to assist the generator in starting willingly. A single water thermostat controlling a three phase contactor to control the immersion heaters, to switch them all on or off at the same time. Perhaps a second maually re-settable  "safety" hot water thermostat to cut off it the water becomes too hot.

The hot water storage tank can have a coil for thermal solar panel water heating.

So, what capacity of tank will I need?

What will the heat recovery time be?

What types of showers and shower pump(s)?

If available where can such an insulated  tank be obtained?

What about hot water temperature safety at the shower heads?

Other?

Z.

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    It takes around 4200 Joules to raise the temperature of 1 litre of water by 1ºC - (1J = 1 Watt for 1 second) - so to raise say 1000l by 50ºC would take 210,000,000 J or around 58kWh - say 3off 3kW immersions for about 6.5 hours (someone please check my maths!) Plus a bit for losses.

    As a starting point, perhaps think in the region of 10 litres/minute for a decent shower, but low flow fittings can reduce that considerably,

    Thermostatic values are usually set to prevent scalding - either one TMV at the tank or individual thermostatic values on the showers, with an upper limit stop.

       - Andy.

  • 0 in reply to AJJewsbury
    AJJewsbury said:
    As a starting point, perhaps think in the region of 10 litres/minute for a decent shower, but low flow fittings can reduce that considerably

    I think that 5 l/min for 10 minutes would be perfectly adequate, though Andy's 10 l/min would be more luxurious and what people might expect nowadays. (If the flow is lower, people might not stay in any longer than they need to.) So the capacity of the tank needs to be 50 l per shower (in the sense of washing 1 person, rather than 1 cubicle).

    The power of the water heater depends upon how many people will use those 4 showers. If there is a queue, supply will have to match demand. So 5 l/min = 83 ml/s = 83 g/s. Each g of water requires 4.2 J per deg C, so to go from 10 to 40 deg C requires 126 J for each g. Multiply that by our 83 g every second and you get 10,500 J/s = 10.5 kW.

  • 0 in reply to Chris Pearson
    Chris Pearson said:
    The power of the water heater depends upon how many people will use those 4 showers. If there is a queue, supply will have to match demand. So 5 l/min = 83 ml/s = 83 g/s. Each g of water requires 4.2 J per deg C, so to go from 10 to 40 deg C requires 126 J for each g. Multiply that by our 83 g every second and you get 10,500 J/s = 10.5 kW.

    So on a 3-phase supply, that sounds like 3 off 3kW immersion heaters.

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  • 0 in reply to Chris Pearson
    Chris Pearson said:
    The power of the water heater depends upon how many people will use those 4 showers. If there is a queue, supply will have to match demand. So 5 l/min = 83 ml/s = 83 g/s. Each g of water requires 4.2 J per deg C, so to go from 10 to 40 deg C requires 126 J for each g. Multiply that by our 83 g every second and you get 10,500 J/s = 10.5 kW.

    So on a 3-phase supply, that sounds like 3 off 3kW immersion heaters.

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