# Calorimetry

Calorimetry is an application that uses **flow rate** measurement combined with **two temperature measurements** (one on the flow circuit and one on the return circuit) to calculate the **heat flow**, and then the heat balance, of an installation. This requires the use of the **algorithm** integrated into all calorimeter flow meters. This **function** also makes it possible to find the cold output

Input/output modules are used to acquire and present information.

The function engine is also used to configure the functions linked to the customer’s business sector (commonly called the “business logic layer”). This engine makes it possible to combine flow rate, temperature or analogue input measurements and produce a result that is displayed directly on the device: yield, COP, power and energy, etc.

Our converters are available in **two versions**:

- mono-pipe/mono-calorimeter measurement,
- bi-pipe/bi-calorimeter measurement.

A mono-pipe calorimeter is used to measure power expended and energy exchanged in a heating or cooling system.

It measures:

- the
**temperature**of the**coolant**(water for example)**entering**the heat transfer system (a boiler, for example), - the
**temperature**of the**coolant leaving**the heat transfer system, - the
**flow rate**of the**coolant**.

The **difference** in temperature between the **input and output circuits** (of a heating system, for example) is proportional to the exchange of thermal energy in the installation (for example, dissipation of heat in radiators and pipes). This can be used to calculate the **heating value** and the **energy expended**.

The following diagram illustrates a measurement result typical of the calorimetry application, in which the values displayed are:

- the
**temperature difference**between the probes, - the
**instantaneous power**in kW, - the
**energy**in kWh.

Calculating the heating value* : Q = v x m x Cp x ∆t°

Calculating energy * : ∫Q = ∫ v x m x Cp x ∆t° dt

Where:

v = volumetric flow (m³/s)

m = density (kg/m³)

Cp = specific heat capacity (Kjoule/kg.°C)

t° = temperature (°C)

* Formula used by the function engine integrated into Ultraflux devices

Please note: our flow meters are not custody transfer meters.