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Re: Ferrite ID

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On 30/09/2026 5:15 am, someone wrote:
> Good points! But for tankless heating, the conventional PID is too 
> sluggish to regulate temperature against potential inlet flow rate and 
> temperature changes that can occur abruptly.
> 
> Feed-Forward Calculation (The Bulk Adjustment): Internal flow-rate 
> sensors and inlet temperature thermistors instantly measure real-time 
> changes. Before the water even reaches the heating elements or heat 
> exchanger, the board uses a feed-forward equation (Power = Flow × Δ T 
> × Constant) to calculate roughly 90–95% of the raw energy required to 
> meet the set point.
> 
> Once the feed-forward mechanism gets the temperature close to the 
> target, the PID feedback loop steps in. It continuously samples the 
> output temperature sensor and dynamically adjusts or "trims" the 
> remaining percentage of power to account for residual errors or system 
> inefficiencies, holding the target output precisely.
> 
> It's all digital.

It can be. That used to be an expensive option. Sampling takes time and 
imposes a delay, and doing it quickly enough used to be even more expensive.

-- 
Bill Sloman, Sydney

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Ferrite ID David Lesher <wb8foz@panix.com> - 2026-09-25 15:58 +0000
  Re: Ferrite ID John R Walliker <jrwalliker@gmail.com> - 2026-09-25 17:02 +0100
  Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 02:55 +1000
  Re: Ferrite ID john larkin <jl@htigct.com> - 2026-09-25 17:13 -0700
    Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 16:39 +1000
      Re: Ferrite ID john larkin <jl@glen--canyon.com> - 2026-09-26 09:10 -0700
        Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 16:32 +1000
          Re: Ferrite ID Brian Gregory <void-invalid-dead-dontuse@email.invalid> - 2026-09-28 23:30 +0100
            Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-29 19:15 +0000
              Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-30 17:24 +1000
                Re: Ferrite ID john larkin <jl@glen--canyon.com> - 2026-09-30 07:50 -0700
                Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-30 20:00 +0000
        Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 16:34 +1000
        Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
      Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
    Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
  Re: Ferrite ID Ian <devnul@blackhole.com> - 2026-09-26 11:57 +0100
    Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-29 00:42 +1000
      Re: Ferrite ID Martin Rid <martin_riddle@verison.net> - 2026-09-28 11:04 -0400
        Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-10-01 04:15 +0000
      Re: Ferrite ID Ian <devnul@blackhole.com> - 2026-09-30 17:47 +0100

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