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2008-10-01
1. INTRODUCTION
The NHTC humidifier is controlled by Nortec’s Patented Auto adaptive Water Management
Control System. This system allows the humidifiers to adapt to basically any potable
incoming water and changes that occur to the water supply. This eliminates the need to
readjust drain timers, changes complete cylinders or time consuming adjustment of
electrode spacing’s. The system also adjusts the drain rate of the humidifier to reduce the
amount of drain water exiting the humidifier as water conditions change. This reduces
energy loss due to excessive draining of hot water and extends cylinder life since less water
and minerals enter the humidifier.
The following is a brief description of how the Auto-Adaptive water Management System
works.
The electrode steam system produces pure uncontaminated steam with variable output
through electronic power control of the electrodes. Water borne minerals remain in the
cylinder and are periodically flushed out through the automatic cylinder drain. On NHTC and
NHPC models the drain automatically empties the steam cylinder if it is not operated for
three days. Solid mineral scale sinks to the bottom of the cylinder which, when filled with
residue, is easily removed and replaced.
A. PROPORTIONAL + INTEGRAL AUTO-ADAPTIVE CONTROL SYSTEM FOR THE
NHTC/ NHPC
(1) NORTEC’s patented P+I Auto-Adaptive control system allows the unit to operate at
an optimal low water level using the same fixed electrode spacing regardless of the
incoming water conditions. Boiling of the water allows the minerals in the water to
remain behind in the cylinder. This raises the contained water conductivity to a
value higher than the incoming water. The P+I Auto-Adaptive control system
monitors and adjusts the contained water conductivity as these changes occur.
(2) The humidifiers are designed to produce full steam output at the lowest possible
electrode coverage to obtain maximum cylinder life.
(3) The units operate between A and D of the main steam output demand.
Accordingly, the current flow between the electrodes in the cylinder is maintained
between these pre-established limits programmed into the P+I Auto-Adaptive
control system.
(4) As the water boils away and the electrode coverage is reduced, the steam output is
also reduced slightly. A pre-determined design parameter of every NORTEC
cylinder is the known time (To) (time optimum) that it takes to boil down from A to
D of output (also referenced to as amp trigger points) at a pre-designed contained
water conductivity. (See Figure 2.)
(5) Whenever the conductivity in the cylinder water is lower than the designed
conductivity, the (Ta) (time actual) to boil down from A to D will be longer than the
To. (See Figure 3.)