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Supply requirement for heaters

whjohnson

Been asked to look at provision of a new supply for  a 72KW TPN blow heater. Am getting current per phase coming in at over 100A with a cable size of 35mm 4 core. Having taken this as correct, am now looking at a 36KW option instead. Current is coming in at around 52A with a cable size of either 10mm 4 core or 16mm 4 core. I don't know anything else at the moment until I visit the site next week, but am not confident that these valuses are correct for the KW ratings.

Have assumed a pf of 1 for resistive load. Don't know how the elements are configured in the heater and am guessing the neutral is required for the fan motor and controls.

Input gratefiully recieved..

Parents
  • 0

    Surely they mean it's a 72kW gas heater, with the electric supply for the controls and blower?

    At full whack a 72kW electric heater would be using ~£20+ a hour, 5 days at 8 hours a day equals around £20k of electric for 6 months of winter use, reduce it a bit for the warmer days, even so, it's going to be £12-15k / yr for one shift of heating.

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  • 0

    Surely they mean it's a 72kW gas heater, with the electric supply for the controls and blower?

    At full whack a 72kW electric heater would be using ~£20+ a hour, 5 days at 8 hours a day equals around £20k of electric for 6 months of winter use, reduce it a bit for the warmer days, even so, it's going to be £12-15k / yr for one shift of heating.

Children
  • 0 in reply to alanblaby

    Hang on. £20/hr x 8 x 5 x 26 = £20,800. Granted the heating could be off for say 4 summer months, and tapering in spring and autumn, but it has to be at least £20k on that basis. Gas would be circa £7k.

    If it is a gas-powered heater, that is comparable to mine at home, but the calorifier does not fire continuously: surely there is a thermostat somewhere!

    I think that Alan is correct and it should all become clear on the site visit.

  • 0 in reply to Chris Pearson

    It is one of these - All electric and no gas. It's for heating up a large main hall prior to an event or performance. It would only be on for a couple of hours prior to the show etc starting. Idea is to try to get more use of the area during the colder months.

    El-Björn UK Ltd - Commercial Heaters - TF72 EBC

     

    El-Bjorn TF 72EL EBC Electric Fan Heater - 3 Phase

    This model can be run at 36KW or 72KW. They also do a 36KW only model.

    Don't know about existing arrangements but the site head has been onto National Grid about a new 100A TPN metered supply.

    Spoke to National Grid, they don’t seem to hold a lot of information on our setup, but he did say that there is no agreed KVA and that each phase of the existing 3 phase supply would be 100A. That was it.

    There is already a 3 phase supply to the building whereby the cable comes in from under the road to an old Fox Barley distribution board (property of DNO?) and from there, various meter tails go off to different meters in the remote meter area and then out to various other DBs.

    Am not sure but I think the incoming supply is rated at 300A.

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