The 515 HC01 application measures the volume, mass and energy content of fluid in a heating or cooling system by using frequency volume flow input in conjunction with analog feed and return temperature inputs.
A selection of fluid types and modes makes it suitable for many heating/cooling applications. The instrument is compatible with a wide range of flowmeter frequency outputs, including millivolt signals, reed switches, Namur proximity switches and pulse trains via its smart front-panel programming.
The instrument calculates the mass flow and energy according to the IAPWS Industrial Formulation (1997) when the fluid type is water, while internal enthalpy and density tables are used for the selection of other industry fluids.
The instrument can calculate the mass and energy for the following common industry fluids:
Water Glycol (35% Solution) Brine (27% CaC2) TYFOXIT F20 TYFOXIT F40 Essotherm 500/Thermaloil THERMINOL 55 User Custom Fluid Formulas
mass flow = volume flow x ρflow
power = Mass flow x (hTF – hTR)
ρflow = density at flow conditions
hTF = Specific enthalpy at feed temperature
hTR = Specific enthalpy at return temperature