Recent content by kyle pender

  1. K

    Effect of voltage on resistance wire life expectancy?

    Yeah, I just had a quick look and they are extremely expensive...more than the heater itself! I am having trouble sourcing an off-the-shelf air heater which can provide the output temperature I need (at least 750°C at an air flow rate of 40-55 SCFM).
  2. K

    Effect of voltage on resistance wire life expectancy?

    Would a step down transformer be an option?
  3. K

    Effect of voltage on resistance wire life expectancy?

    I am using a 30kW air heater which is using resistance wire. I am not exactly sure what type of wire it is and hope this will not be an issue in answering this question. The heater is rated at 380V and 45amps(max)...my supply is 415VAC (+ 6% and - 10%) and 45amps. Any idea if this extra...
  4. K

    Pressure losses in electric air heater

    How would this effect the mass flow rate leaving the heater? I was under the impression the 3kPa loss would result in some loss in mass flow (i.e. cannot assume mass flow rate across heater is constant). I have a means of measuring the heater inlet velocity but not outlet (especially when it is...
  5. K

    Pressure losses in electric air heater

    I have an electric air heater with a pressure loss of 3kPa (according to manufacturer at the flow rate and temperature I will be using). Air is supplied to the heater using a centrifugal fan with a static pressure of 8.7kPa (gauge) and a flow rate of 88m3/hr, giving a dynamic pressure of around...
  6. K

    Required current rating of 3-phase power system

    My background is mechanical engineering so not great with the electrical side. I plan on buying a air-preheater (resistive wire heated) which has a power rating of 30kW, supplied by 3-phase. I need to determine whether my 3-phase supply (415V 32A) has a max current that can cope with this. My...
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