Heat Calculator - Frequency Flow (Volume)

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.

CALCULATIONS

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)

where:

ρflow = density at flow conditions

hTF = Specific enthalpy at feed temperature

hTR = Specific enthalpy at return temperature