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During the calculation of the transferred heat quantity, the
calorimeter iSolar WMZ takes into account that the specific
heat capacity c and the density
r
depend on the temperature
and the mixing proportion (access to limited values). Using
these parameters, the measurement of the flow and return
temperatures with two precision temperature sensors, and
the evaluation of the impulses of a volumetric flowmeter, the
iSolar WMZ calculates the transferred quantity.
This device can be used in systems which use water or wa-
ter-propylene glycol mixtures as the heat transfer fluid. The
proportion (in vol%) used in a system and the specification
of the selected flowmeter (in liters per impulse) are adjusted
locally after the installation.
5. Function
6. Indication and adjustment channels
Display channels
• FL (flow temperature in °C / °F)
• RE (return temperature in °C / °F)
• heat quantity
(in Wh / MBTU or kWh / MMBTU respectively)
• volumetric flow rate (in l/min or gpm)
• power (in kW)
adjustment channels
• antifreeze type
• antifreeze
• flow measurement (V40 or VTP)
• volume per impulse
• subaddress
• bus mode
• bus master
• sensor offset
• language
• temperature unit
• flow rate unit
• energy unit
Safety prompt:
Save?
Yes
note:
After a change in the adjustment channel has been made,
a safety prompt appears. The adjustment is saved after the
question has been confirmed with “yes“.
FL
RE
15 kWh
Heat
85,6 °C
45,7 °C
6.1 Heat quantity
FL
RE
15 kWh
Heat
85,6 °C
45,7 °C
6.2 Flow and return temperatures
FL = indicates the current flow temperature
(example: 85.6 °C)
RE = indicates the current return temperature
(example: 45.7 °C)
The determined heat quantity is indicated. If the heat quantity
is smaller than 1 MWh, the quantity is indicated with the
unit Wh (MBTU). If the quantity is larger, it is indicated using
the unit kWh (MMBTU).
note:
When the indication has reached 999,999 kWh (3412.138
MMBTU), it will start again at 0.
