515-HC12 – Heat Calculator – Analogue Flow (Mass)

The 515-HC12 application measures the volume, mass and energy content of fluid in a heating or cooling system by using an analog mass 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 flowmeter input signal can be selected as either 0-5V, 1-5Vor 4-20mA. Minimum and maximum points are programmed and non-linear correction points can be used to better reflect the flowmeters behaviour.

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:
• volume flow = mass flow/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

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