Applications
Water/heat differential
(Bi-directional)
Application areas
Calculation of the heat quantity, which is transmitted to or from heat a exchanger in a water
circuit. Typical application for energy measurement when heating or cooling a heat accumulator.
Bi-directional operation is possible in either a single flow direction or in alternating flow
directions.
Measurements
Measurement of the operating volume in a water circuit as well as the water temperature
immediately before and after the heat exchanger (in inflow as well as return).
A pressure sensor can also be connected in order to measure the operational pressure in the
circuit. This pressure measurement has no influence on the actual calculation (see inputs).
Inputs
• Inflow: Flow (q) plus direction signal if required, temperature (T
1
)
• Return: Temperature (T
2
)
Note!
- For an exact calculation of the process values and measurement range limits, a further input value for the
operating pressure of the water network is required. The average operating pressure (p) is a preset value (not an
input signal). The pressure can only be entered as an average signal, even if the pressure is measured using a
pressure sensor.
- The flow meter installation point is selectable!
- The installation point is defined as the warm/cold side and not the inflow/return, as this definition is clear for
all operating modes.
- It is recommended to place the flow meter in a position in the circuit where the temperature is closest to the
ambient (room) temperature.
Calculated values
Separate calculation of: mass flows, heat differential (heating flows), Enthalpy difference, density
(IAPWS–IF97 Standard).
Output values/display at unit
• Heat flow (+), heat flow (-), mass flow (+), mass flow (-), operating volume, temperature 1,
temperature 2, Enthalpy difference, density.
• Heat sum (+), mass sum (+), heat sum (-), mass sum (-), operating volume sum.
(+): Heat output (heating)
(-): Heat input (cooling)
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