14
KI-OM-0591 Rev 3
Operations
3
Operations
3.1
General
The JFD Electric Powered Water Heating Module, WHE-3, has been designed to run with the
minimum amount of operator input. The temperature controller governs the process based on
the set point and feedback from the PT100 probe giving the measured output temperature
(PV). The operator is required to input the set point to the controller and switch on the
appropriate heater banks to provide the required capacity. When operating the WHE-3 from
the remote control panel, remote fine temperature control of the outlet water is achieved by
adjusting the temperature control knob. All other function and control will be selected and
governed locally on the WHE-3 unit.
Note
Heater element selection and switching for temperature rise range must still take
place locally at the machine control panel. If a temperature set-point is selected on
the remote panel that is above the range of the heater element selection then the
unit will close the temperature control valve in an effort to achieve the required
set-point but will have insufficient heat input to achieve the set-point. Similarly if a
set-point is selected that is below the range of the heater element selection then
the unit will fully open the temperature control valve and may control temperature
to some extent but massive energy losses will be incurred due to excessive
dumping of heated water.
3.2
Heating Requirement
Before running the unit the operator must determine the heating required for the divers. The
following steps outline the procedure for calculating the heating required.
1
Obtain the following information:
• Approximate length of umbilical in water
• Approximate operating temperature of fluid desired at bottom (T
b
)
• Inlet water temperature (T
in
)
2
Determine the temperature loss along the umbilical (T
loss
)
Using the graph (Fig 3.1) to determine the temperature loss along the umbilical hose, select
the length of the umbilical hose on the vertical y-axis and move horizontally to the right until
the line is intersected then move vertically upward to the horizontal x-axis. The value on the
x-axis will yield the approximate temperature loss (T
loss
) through the specified length of
umbilical.
3
Determine outlet temperature (T
out
).
Add the temperature loss through the umbilical (T
loss
) to the temperature required at the diver
(T
b
). This will give the total outlet temperature (T
out
) required. This value must be entered into
the controller as the control set point value (SV).
Summary of Contents for WHE - 3
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